Hp Water Dispenser 181A Users Manual

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Assembly-Level
Service Guide

HP 53131A/132A/181A
225 MHz Counter

Assembly-Level Service
Guide
This guide describes how to service the HP 53131A and HP 53132A
Universal Counters, and the HP 53181A Frequency Counter.
The information in this guide applies to instruments having the number
prefix listed below, unless accompanied by a “Manual Updating Changes”
package indicating otherwise.
SERIAL PREFIX NUMBER:

3711 AND ABOVE (HP 53131A)
3710 AND ABOVE (HP 53132A)
3711 AND ABOVE (HP 53181A)

HP 53131A/132A/181A 225 MHz
Counter

Copyright Hewlett-Packard
Company 1994, 1995, 1997,
1999

Certification
and Warranty

All Rights Reserved.
Reproduction, adaptation, or
translations without prior
written permission is
prohibited, except as allowed
under the copyright laws.

Hewlett-Packard Company
certifies that this product met
its published specification at the
time of shipment from the
factory. Hewlett-Packard
further certifies that its
calibration measurements are
traceable to the United States
National Institute of Standards
and Technology (formerly
National Bureau of Standards),
to the extent allowed by the
Institute’s calibration facility,
and to the calibration facilities
of other International
Standards Organization
members.

Printed: March 1999
Printed in USA
Manual part number
53131-90039

Certification

Before Cleaning
Disconnect the product from
operating power before
cleaning.
Warning Symbols That May
Be Used In This Book

Instruction manual symbol; the
product will be marked with
this symbol when it is necessary
for the user to refer to the
instruction manual.

Warranty
HP warrants HP hardware,
accessories and supplies against
defects in materials and
workmanship for a period of
three years from date of
shipment. If HP receives notice
of such defects during the
warranty period, HP will, at its
option, either repair or replace
products which prove to be
defective. Replacement products
may be either new or like-new.
HP warrants that HP software
will not fail to execute its
programming instructions, for
the period specified above, due
to defects in material and
workmanship when properly
installed and used. If HP
receives notice of such defects
during the warranty period, HP
will replace software media
which does not execute its
programming instructions due
to such defects.
For detailed warranty
information, see back matter.

WARNING
BODILY INJURY OR DEATH
MAY RESULT FROM
FAILURE TO HEED A
WARNING. DO NOT
PROCEED BEYOND A
WARNING UNTIL THE
INDICATED CONDITIONS
ARE FULLY UNDERSTOOD
AND MET.
CAUTION
Damage to equipment, or
incorrect measurement data,
may result from failure to
heed a caution. Do not
proceed beyond a CAUTION
until the indicated conditions
are fully understood and met.
Safety Earth Ground

Indicates hazardous voltages.

Indicates earth (ground)
terminal.

or

Indicates terminal is connected
to chassis when such connection
is not apparent.

Indicates Alternating current.

Safety Considerations
General

Safety Considerations
(contd)

An uninterruptible safety earth
ground must be maintained
from the mains power source to
the product’s ground circuitry.
WARNING
WHEN MEASURING POWER
LINE SIGNALS, BE
EXTREMELY CAREFUL AND
ALWAYS USE A
STEP-DOWN ISOLATION
TRANSFORMER WHICH
OUTPUT IS COMPATIBLE
WITH THE INPUT
MEASUREMENT
CAPABILITIES OF THIS
PRODUCT. THIS PRODUCT’S
FRONT AND REAR PANELS
ARE TYPCIALLY AT EARTH
GROUND. THUS, NEVER TRY
TO MEASURE AC POWER
LINE SIGNALS WITHOUT AN
ISOLATION TRANSFORMER.
For additional safety and
acoustic noise information, see
back matter.

Indicates Direct current.

This product and related
documentation must be
reviewed for familiarization
with this safety markings and
instructions before operation.

Hewlett-Packard Company
Santa Clara Division
5301 Stevens Creek Boulevard
Santa Clara, California 95052-8059

7.NC.NL.A.11.03.97.R1.P.CW6FC

Contents
Preface
How to Use This Guide xiii
Repair Strategy xiii
Instrument Identification xiii
Instruments Covered by this Guide xiv
Assembly-Level Service Guide Organization
How to Order Guides xv
Description of the 225 MHz Counters xvi
Options xviii
Hardware xviii
Support xix
Accessories Supplied and Available xix
Accessories Supplied xix
Accessories Available xix

1

xiv

Performance Tests
Introduction 1-2
Operational Verification 1-2
Complete Performance Tests 1-3
Optional HP-IB Verification 1-3
Recommended Calibration Cycle 1-3
Test Record 1-3
Equipment Required 1-4
HP 53131A/132A/181A Operational Verification 1-5
Power-On Self Tests 1-5
Run Self Test 1-8
Termination Check 1-8
External Arm Test (HP 53131A/132A Only) 1-10
Equipment 1-10
Assembly-Level Service Guide

iii

Contents

Counter Setup 1-10
Procedure 1-11
External Timebase Tests 1-12
Equipment 1-12
1 MHz External Timebase Input (HP 53131A and HP
53181A Only) 1-13
5 MHz External Timebase Input (HP 53131A and HP
53181A Only) 1-14
10 MHz External Timebase Input (HP 53131A and HP
53181A Only) 1-14
10 MHz External Timebase Input for the HP
53132A 1-15
HP 53131A/132A Complete Performance Tests 1-16
Test 1: Time Interval (HP 53131A/132A Only) 1-17
Equipment 1-17
Counter Setup 1-17
Procedure 1-18
Test 2: Trigger Level (HP 53131A/132A Only) 1-19
Equipment 1-19
Counter Setup 1-19
Procedure 1-20
Test 3: Channels 1 and 2 Frequency Sensitivity
(HP 53131A/132A Only) 1-22
Equipment 1-22
Counter Setup 1-22
100 kHz to 100 MHz Sensitivity for HP 53131A/132A 1-23
100 MHz to 200 MHz Sensitivity for HP 53131A/
132A 1-25
200 MHz to 225 MHz Sensitivity for HP 53131A/
132A 1-26
Test 4: Channels 1 and 2 Frequency Accuracy
(HP 53131A/132A Only) 1-27
Equipment 1-27
iv

Assembly-Level Service Guide

Contents

Counter Setup 1-27
Procedure 1-28
Test 5: Option 030/050/124 Channel 3 Frequency
Sensitivity (HP 53131A/132A Only) 1-30
Equipment 1-30
Counter Setup 1-30
100 MHz to 2.5 GHz Sensitivity for HP 53131A/132A Option
030 only 1-31
2.7 to 3.0 GHz Sensitivity for Option 030 only 1-32
200 MHz to 5.0 GHz Sensitivity for HP 53131A/132A
(Option 050 only) 1-33
200 MHz to 12.4 GHz Sensitivity for HP 53131A/132A
(Option 124 only) 1-34
Test 6: Option 030/050/124 Channel 3 Frequency
Accuracy (HP 53131A/132A Only) 1-35
Equipment 1-35
Counter Setup 1-35
Procedure 1-35
Test 7: Peak Volts, Channels 1 and 2 (HP 53131A/132A
Only) 1-37
Equipment 1-37
Counter Setup 1-37
Volt Peak 1 1-38
Volt Peak 2 1-39
HP 53131A/132A HP-IB Verification Program
(Optional) 1-40
HP 53131A/132A Performance Test Record
1-41

Assembly-Level Service Guide

v

Contents

HP 53181A Complete Performance Tests 1-47
Test 1: Trigger Level (HP 53181A Only) 1-48
Equipment 1-48
Counter Setup 1-48
Procedure 1-49
Test 2: Channel 1 Frequency Sensitivity (HP 53181A
Only) 1-51
Equipment 1-51
Counter Setup 1-51
100 kHz to 100 MHz Sensitivity for HP 53181A 1-52
100 MHz to 200 MHz Sensitivity for HP 53181A 1-54
200 MHz to 225 MHz Sensitivity for HP 53181A 1-54
Test 3: Channel 1 Frequency Accuracy (HP 53181A
Only) 1-55
Equipment 1-55
Counter Setup 1-55
Procedure 1-56
Test 4: Option 015/030/050/124 Channel 2 Frequency
Sensitivity 1-58
Equipment 1-58
Counter Setup 1-58
100 MHz to 1.5 GHz Sensitivity for Option 015 Only 1-59
100 MHz to 2.7 GHz Sensitivity for Option 030 Only 1-60
2.8 to 3.0 GHz Sensitivity for Option 030 Only 1-61
200 MHz to 5.0 GHz Sensitivity for Option 050 only 1-61
200 MHz to 12.4 GHz Sensitivity for Option 124 only 1-62
Test 5: Option 015/030/050/124 Channel 2 Frequency
Accuracy (HP 53181A Only) 1-63
100 MHz to 1.5 GHz Accuracy Test for Option 015 1-63
Equipment 1-63
Counter Setup 1-63
Procedure 1-64
vi

Assembly-Level Service Guide

Contents

Minimum to Maximum Accuracy Test for Options 030/050/
124 1-65
Equipment 1-65
Counter Setup 1-65
Procedure 1-66
Test 6: Peak Volts, Channel 1 (HP 53181A Only) 1-68
Equipment 1-68
Counter Setup 1-68
Procedure 1-69
HP 53181A HP-IB Verification Program (Optional) 1-70
HP 53181A Performance Test Record
1-71

2

Service
Introduction 2-2
Returning the Instrument to Hewlett-Packard for
Service 2-3
To Provide Repair Information 2-3
To Pack in the Original Packaging Materials 2-4
To Pack in the Commercially Available Materials 2-5
About the HP 53131A/132A Calibration Menu 2-6
Overview of the HP 53131A/132A Calibration Menu 2-6
The HP 53131A/132A Calibration Menu Tree 2-8
To View the Calibration Menu and Security Status 2-9
To Unsecure for Calibration 2-9
To Initiate the Calibration Routines 2-9
To Secure Against Calibration 2-13
To Change to a New Security Code 2-13
To View the Calibration Count 2-14
To Get Help with the Calibration Menu 2-14
The HP 53131A/132A Calibration Procedures 2-15
First Determine the Counter Firmware Revision 2-15
Assembly-Level Service Guide

vii

Contents

To Calibrate the Offset for Channels 1 and 2 2-15
To Calibrate the Gain for Channels 1 and 2 2-18
To Calibrate Time Interval 2-19
CAL: TI QUIK? Calibration 2-20
Equipment 2-20
CAL: TI FINE? Calibration 2-21
Equipment 2-21
To Calibrate the Standard Timebase 2-23
To Calibrate the High Stability Timebase Option (Medium,
High, or Ultra-High) 2-24
About the HP 53181A Calibration Menu 2-25
Overview of the HP 53181A Calibration Menu 2-25
The HP 53181A Calibration Menu Tree 2-27
To View the Calibration Menu and Security Status 2-28
To Unsecure for Calibration 2-28
To Initiate the Calibration Routines 2-29
To Secure Against Calibration 2-29
To Change to New the Security Code 2-30
To View the Calibration Count 2-30
To Get Help with the Calibration Menu 2-30
The HP 53181A Calibration Procedures 2-31
First Determine the Counter Firmware Revision 2-31
To Calibrate the Offset for Channel 1 2-31
To Calibrate the Gain for Channel 1 2-33
To Calibrate the Standard Timebase 2-34
To Calibrate the High Stability Timebase Option (Medium,
High, or Ultra-High) 2-35
Pre-Troubleshooting Information 2-36
Safety Considerations 2-36
Recommended Test Equipment 2-37
Repair Considerations 2-38
Electrostatic Discharge 2-38
viii

Assembly-Level Service Guide

Contents

Surface Mount Repair 2-38
Disassembly and Reassembly Specifics 2-38
After Service Considerations 2-39
Product Safety Checks 2-39
Product Performance Checks 2-39
Assembly Identification and Location 2-40
Troubleshooting the Counter 2-45
Power Supply Check 2-45
Overview of the Self-Test Routines 2-47
Diagnosing the Faulty Assembly by Using the
Self Tests 2-49
To Run the Test-All Self Test 2-49
To Run the Individual Self Tests 2-50

3

Replacing Assemblies
Introduction 3-2
Tools Required 3-3
Do This First 3-3
To Remove the Cover 3-4
To Remove the Front Bezel 3-6
To Remove A1 Motherboard Assembly 3-9
To Remove the A2 Display Board, Keypads,
and Window 3-11
To Remove A3 1.5/3.0/5.0/12.4 GHz Channel Assembly
(Option 015/030/050/124) 3-13
To Remove A4 AC Power Supply Assembly 3-15
To Remove A5 DC Power Input Assembly
(Option 002) 3-17
To Remove A6 High Stability Timebase Assembly
(Options 001, 010, and 012) 3-19
To Remove the Rear Terminals (Option 060) 3-21

Assembly-Level Service Guide

ix

Contents

4

Retrofitting Options
Introduction 4-2
Tools Required 4-2
Do This First 4-2
To Retrofit A3 1.5/3.0/5.0/12.4 GHz Channel Assembly
(Option 015/030/050/124) 4-3
To Retrofit A5 DC Power Input Assembly (Option
002) 4-4
Option 002 DC Power Input Assembly Parts 4-4
Preliminary Procedure 4-4
Retrofitting Procedure 4-5
To Retrofit A6 High Stability Timebase Assembly
(Options 001, 010, and 012) 4-11
Option 001 Medium Stability Timebase Assembly
Parts 4-11
Option 010 High Stability Timebase Assembly Parts 4-11
*
Option 012 Ultra-High Stability Timebase Assembly
Parts 4-11
Procedure 4-12
To Retrofit the Rear Terminals (Option 060) 4-14
Option 060 Rear Terminals Parts 4-14

5

Replaceable Parts
Introduction 5-2
Exchange Assemblies 5-2
Reference Designations 5-3
Replaceable Parts 5-3
How To Order A Part 5-4
Parts Identification 5-4
Contacting Hewlett-Packard

x

5-5

Assembly-Level Service Guide

Contents

Cabinet Parts and Hardware

6

5-6

Backdating
Introduction 6-2
Manual Changes 6-2
Older Instruments 6-2
Backdating Hardware 6-3
Backdating Firmware 6-8
Backdating Specifications 6-16

7

HP 53131A/132A Specifications
Introduction 7-2
Instrument Inputs 7-2
Time Base 7-4
Measurement Specifications 7-5
Measurement Definitions 7-12
Measurement Arming and Processing
General Information 7-16

8

7-14

HP 53181A Specifications
Introduction 8-2
Instrument Inputs 8-2
Time Base 8-4
Measurement Specifications 8-5
Measurement Definitions 8-9
Measurement Arming and Processing
General Information 8-11

8-10

Index

Assembly-Level Service Guide

xi

Contents

xii

Assembly-Level Service Guide

Preface
This guide provides assembly-level service information for the HP 53131A
and HP 53132A Universal Counters, and the HP 53181A Frequency
Counter.

How to Use This Guide
Repair Strategy
This service guide is designed to isolate failures to the assembly level only.
The HP 53131A/132A/181A Counter can be returned to Hewlett-Packard
(HP) for all service work, including troubleshooting, and verifying
specifications. Contact your nearest HP Sales and Service Office for more
details.
Note: there is an Express Repair/Performance Calibration Service for USA
customers if downtime is critical. You can receive your repaired Counter
via overnight shipment. Just call 800-403-0801 and ask for Express
Repair/Performance Calibration Service. When your Counter is repaired,
it will be returned via overnight shipment at no extra charge.
If you decide to service the Counter yourself, use the troubleshooting
procedures in Chapter 2 (Service) and the disassembly and reassembly
procedures in Chapter 3 (Replacing Assemblies). Then use the calibration
instructions in Chapter 2 to calibrate the Counter for peak-performance
operation, and finally perform the complete performance tests in
Chapter 1 to verify the Counter’s specifications.

Instrument Identification
Instrument identification is made from the serial number on the rear
panel of the Counter. HP uses a two-part serial number with the first part
(prefix) identifying a series of instruments and the second part (suffix)
identifying a particular instrument within a series. An HP-assigned alpha
character between the prefix and suffix identifies the country in which the
instrument was manufactured.
Assembly-Level Service Guide

xiii

Preface

Instruments Covered by this Guide
This guide applies directly to HP 53131A, HP 53132A, and HP 53181A
Counters that have the same serial number prefix(es) shown on the title
page. If the serial number prefix of your Counter differs from that listed
on the title page of this guide, then there may be differences between this
guide and your instrument.
Instruments having a higher serial prefix are covered when required by
one or more manual-change sheets included with this guide. If a required
change sheet is missing, contact your nearest HP Sales Office listed at the
back of this guide. Instruments having a serial prefix lower than that
listed on the title page are covered in Chapter 6, “Backdating.”

Assembly-Level Service Guide Organization
This assembly-level service guide consists of a table of contents, preface,
eight chapters and an index. The page running headers identify the
chapters and sections of this manual. The chapter contents are
summarized as follows:
Chapter 1, “Performance Tests,” provides procedures that verify the
Counter operates properly and meets the HP 53131A/132A or HP 53181A
specifications given in Chapter 7, “HP 53131A/132A Specifications,” or
Chapter 8, “HP 53181A Specifications,” in this guide.
Chapter 2, “Service,” is divided into seven main sections that provide
instructions for returning the Counter to HP for service, calibrating the
Counter, and troubleshooting the assemblies in the Counter.
Chapter 3, “Replacing Assemblies,” provides procedures for replacing
defective assemblies and/or modules in the Counter.
Chapter 4, “Retrofitting Options,” provides field-installation procedures
that help you install options into the Counter.
Chapter 5, “Replaceable Parts,” lists the replaceable parts contained in
the Counter, and explains how to order replacement parts for your
Counter.

xiv

Assembly-Level Service Guide

Preface

Chapter 6, “Backdating,” contains information required to adapt this
manual for older instruments.
Chapter 7, “HP 53131A/132A Specifications,” lists all the specifications
and operating characteristics for the HP 53131A/132A Universal Counter.
Chapter 8, “HP 53181A Specifications,” lists all the specifications and
operating characteristics for the HP 53181A Frequency Counter.

How to Order Guides
The part number for this guide is listed in the Certification and Warranty
page (located on the back of the title page) and on the rear cover of this
guide. Preface will always follow table of contents. Page numbers will be
in roman lower case.

Assembly-Level Service Guide

xv

Preface

Description of the 225 MHz Counters
The HP 53131A and HP 53132A are universal counters capable of
measuring frequencies to 225 MHz on Channels 1 and 2. With an optional
Channel 3, this frequency is extended to 3.0 GHz (Option 030); 5.0 GHz
(Option 050) or 12.4 GHz (Option 124).”
For the HP 53131A, frequency and time interval resolutions are 10 digits
in one second and 500 picoseconds, respectively. The HP 53131A provides
users with an HP-IB measuring speed of 200 measurements per second,
and is suitable for bench-top operation and lower-volume ATE operation.
The frequency and time interval resolutions for the HP 53132A are up to
12 digits in one second and 150 picoseconds, respectively. The HP 53132A
provides users with exceptional resolution, and is ideal for ATE systems
operation.
The HP 53131A/132A basic measurement functions include Frequency,
Period, Pulse Width, Duty Cycle, Rise/Fall Time, Time Interval,
Frequency Ratio, Totalize, Phase, and Peak Voltage.
The HP 53181A is a frequency counter capable of measuring frequencies
to 225 MHz on Channel 1. Depending on which optional Channel 2 the
counter contains, this capability is extended to 1.5 GHz (Option 015) or
3.0 GHz (Option 030). The HP 53181A has a frequency resolution of
10 digits in one second.
The HP 53181A provides users with an HP-IB measuring speed of
200 measurements per second, and is suitable for bench-top and ATE
operation.
The HP 53181A basic measurement functions include Frequency, Period,
Peak Voltage, and Frequency Ratio (if Channel 2 is installed).
The HP 53131A/132A/181A include additional measurement functions
and features that are designed specifically for manufacturing and service
applications:

xvi

Assembly-Level Service Guide

Preface

•

1, 5, 10 MHz external reference capability—to match customer’s house
standard (however, the HP 53132A’s external reference capability is
10 MHz only),

•

optional ultra-high stability , high stability, or medium stability oven
oscillators for high accuracy needs,

•

external gating,

•

statistics,

•

automatic limit testing,

•

SCPI programming capability, and

•

analog display mode limit testing

Programmable control is performed via an HP-IB. The HP-IB and a
talk-only RS-232C serial port are standard for the HP 53131A/132A/181A.
The serial port is for printing measured and analyzed data on serial
printers, or for outputting an out-of-limit signal.

Assembly-Level Service Guide

xvii

Preface

Options
The options available for the HP 53131A/132A/181A Counter are listed
following this paragraph. Specifications for the options are listed in
Chapter 7, “HP 53131A/132A Specifications,” and Chapter 8, “HP 53181A
Specifications.” If you’ve purchased an option with the initial order, it will
be installed at the factory and ready for operation at delivery. Refer to the
“Retrofitting Options” chapter in this guide for instructions on field
installation of the options.

NOTE

The “0’s” and “1’s” in the following option numbers are numeric characters
(that is, they are not letters).

Hardware
•

Medium Stability Oven Timebase, Option 001

•

DC Power Input, Option 002

•

High Stability Oven Timebase, Option 010

•

Ultra-High Stability Oven Timebase, Option 012 (HP 53132A and
HP 53181A Only)

•

1.5 GHz RF Input Channel (Channel 2), Option 015 (HP 53181A Only)

•

3.0 GHz RF Input Channel (Channel 3), Option 030

•

5.0 GHz RF Input Channel (Channel 3), Option 050

•

12.4 GHz RF Input Channel (Channel 3), Option 124

•

*Rear

•

Rack Mount Kit, Option 1CM (HP part number 5063-9240)

Terminals, Option 060

*

For the HP 53131A/132A Option 030, front and rear terminals can exist for Channel 1 and 2. The optional
Channel 3 can be configured as rear terminals only or front terminals only. For the HP 53181A, front and rear
terminals can exist for Channel 1. The optional Channel 2 can be configured as rear terminals only or front
terminals only. Option 050 and Option 124 can be configured only as front terminals.

xviii

Assembly-Level Service Guide

Preface

Support
•

5-year Return to HP for Repair, Option W50

•

5-year Return to HP for Calibration, Option W52

Accessories Supplied and Available
Accessories Supplied
•

Power cord, 2.3 meters

Accessories Available
•

HP 34161A Accessory Pouch

•

Printer RS-232 Interface cables, HP 24542G or HP 24542H

•

HP-IB cables, HP 10833A/B/C/D

Assembly-Level Service Guide

xix

Preface

xx

Assembly-Level Service Guide

1

Performance Tests
Verifying Specifications

Chapter 1 Performance Tests
Introduction

1

Introduction
This chapter provides procedures to test the electrical performance of the
HP 53131A/132A Universal Counter and HP 53181A Frequency Counter,
using the specifications listed in Chapter 7, “HP 53131A/132A
Specifications,” and Chapter 8, “HP 53181A Specifications,” of this guide.
Three types of testing are provided:
•

Operational Verification

•

Complete Performance Tests

•

Optional HP-IB Verification

This chapter is organized as follows:
•

Introduction

page 1-2

•

Equipment Required

page 1-4

•

HP 53131A/132A/181A Operational Verification

page 1-5

•

HP 53131A/132A Complete Performance Tests

page 1-16

•

HP 53131A/132A HP-IB Verification Program (Optional) page 1-40

•

HP 53131A/132A Performance Test Record (Page 1 of 6)

page 1-41

•

HP 53181A Complete Performance Tests

page 1-47

•

HP 53181A HP-IB Verification Program (Optional)

page 1-70

•

HP 53181A Performance Test Record (Page 1 of 4)

page 1-71

Operational Verification
The operational verification is an abbreviated series of checks that may be
performed to give a high degree of confidence that the instrument is
operating properly without performing the complete performance tests.
An operational verification is useful for incoming inspection, routine
maintenance, and after instrument repair.
1-2

Assembly-Level Service Guide

Chapter 1 Performance Tests
Introduction

Complete Performance Tests

Optional HP-IB Verification
The HP-IB verification program, described on page 1-40
(HP 53131A/132A) or page 1-70 (HP 53181A), exercises the Counter via
the HP-IB interface. The program is written for an HP 9000 series 200 or
300 Desktop Computer as the controller. If the instrument successfully
completes all phases of the verification program, there is a very high
probability that the HP-IB interface is working properly.
The HP-IB program is available on disks as indicated in the following
listing:
•

For HP 53131A/132A Counters—HP part number 53131-13501
(3 1/2-inch LIF disk) and HP part number 53131-13502 (5 1/4-inch
LIF disk).

•

For HP 53181A Counters—HP part number 53181-13501
(3 1/2-inch LIF disk) and HP part number 53131-13502 (5 1/4-inch
LIF disk).

Recommended Calibration Cycle
The Counter requires periodic verification of operation. Depending on the
use and environmental conditions, aging, and measurement accuracy
required, the Counter should be checked using the operational verification
procedure at least once every year.

Test Record
The results of the operational verification, complete performance tests,
and HP-IB verification test should be recorded on a copy of the
Performance Test Record, located at the end of each (i.e., HP 53131A/132A
and HP 53181A) complete performance tests section in this chapter.

Assembly-Level Service Guide

1-3

1

The complete performance tests verify the specifications listed in
Chapter 7, “HP 53131A/132A Specifications,” and Chapter 8, “HP 53181A
Specifications.” All tests can be performed without accessing the inside of
the instrument.

Chapter 1 Performance Tests
Equipment Required

1

Equipment Required
Table 1-1. Recommended Test Equipment
Instrument

Required Characteristics

Recommended Model

Use

Synthesizer

DC to 13 MHz

HP 3325B

OV, P, T

Synthesized Signal Generator 100 kHz to 2560 MHz

HP 8663A

OV, P, T

Pulse Generator

5 ns pulse width

HP 8130A or equivalent

OV, C

Sweep Oscillator

3.0 GHz

HP 8340B

P, T

-10

Primary Frequency Standard
(10 MHz House Standard)

Absolute accuracy >1 x 10

HP 5071A

C

DC Power Supply

Adjustable to 5.000V

HP 6234A

C

Digital Voltmeter

Microvolt accuracy

HP 3458A

OV, C

Time Interval Calibrator

Effective edge repeatability:
<10 ps

HP 59992A J06

C

HP 1250-0780

OV, P

HP 11001-60001

OV, P, C T

—

HP 10100C

OV, P, C

BNC(m) to BNC(m), 48 inches

HP 10503A

OV, P, C, T

—

1250-0781

P, C

Type N-to-BNC Connector
BNC-to-Dual Banana Plug
50Ω Feedthrough (3)
50Ω Coaxial Cable with
BNC connectors (5)
Coaxial BNC Tee Connector
P = Performance Tests
OV = Operational Verification
C = Calibration
T = Troubleshooting

—
BNC(m) to banana plug

Some of this equipment may no longer be available as new. Use an equivalent model number.

1-4

Assembly-Level Service Guide

Chapter 1 Performance Tests
HP 53131A/132A/181A Operational Verification

1

HP 53131A/132A/181A Operational
Verification
The operational verification is an abbreviated series of checks that may be
performed to give a high degree of confidence that the instrument is
operating properly without performing the complete performance tests.
If you are unfamiliar with the operation of the Counter, you should review
the Chapter 1, “Getting Started,” in the Operating Guide. However, the
procedures in this chapter are written so that little experience is
necessary. The procedures should be followed in the order in which they
appear.

Power-On Self Tests
1

Inspect the Counter for any damage.

2

Make sure no cables are connected to the input channels (rear
and front panels) of the Counter.

NOTE

It is normal for the fan in the Counter to continue to run after the Counter
is placed in Standby mode. Power to the timebase is continuous to
maintain long term measurement reliability, and the fan helps maintain
timebase temperature stability.

NOTE

The power supply will automatically sense the input voltage; thus, there is
no need to change the ac voltage setting.
3

Connect the power cord to the Counter, and connect the other end
of the power cord to the primary power source.

4

Press POWER key to turn on the Counter.

Assembly-Level Service Guide

1-5

Chapter 1 Performance Tests
HP 53131A/132A/181A Operational Verification

1

5

Verify that the following happens:
•

All segments of the front-panel display light up,

•

SELFTST: PASS is displayed,

•

HP-IB AT n is quickly displayed—where “n” represents the HP-IB
address (Note that some earlier versions of the Counter’s firmware did
not display the HP-IB address at power-up.), and

•

dashes are displayed.

The Counter is now ready to measure frequency of a signal applied to
CHANNEL 1 input as indicated by illumination of the Freq and Ch1
annunciators.
If a fail message is displayed, refer to the troubleshooting section in
Chapter 2, “Service,” of this guide.
6

For HP 53131A/132A, mark Pass or Fail in the HP 53131A/132A
Performance Test Record on page 1-41, Test 1.

6’

For HP 53181A, mark Pass or Fail in the HP 53181A Performance
Test Record on page 1-71, Test 1.

7

Connect the Counter’s rear-panel 10 MHz Out as shown in
Figure 1-1A or Figure 1-1B, depending on which Counter you are
testing.

HP 53131A/132A
Counter

10 MHz
Out
(rear panel)

Channel 2
Channel 1

BNC Tee

Figure 1-1A. Operational Verification Setup for HP 53131A/132A
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Assembly-Level Service Guide

Chapter 1 Performance Tests
HP 53131A/132A/181A Operational Verification

HP 53181A
Counter

10 MHz
Out
(rear panel)

1

Channel 1

Figure 1-1B. Operational Verification Setup for HP 53181A
8

Depending on which Counter you are testing, verify the
appropriate reading as shown below:
For HP 53131A and HP 53181A, verify a reading of 10.000,000,00 MHz.
For the HP 53132A, verify a reading of 10.000,000,000 MHz.

9

For HP 53131A/132A, mark Pass or Fail in the HP 53131A/132A
Performance Test Record on page 1-41, Test 2.

9’

For HP 53181A, mark Pass or Fail in the HP 53181A Performance
Test Record on page 1-71, Test 2.
The remaining steps apply to the HP 53131A and HP 53132A only
since the HP 53181A does not have a standard Channel 2 input.
For the HP 53181A, proceed to the following “Run Self Test” section.

NOTE

10

Press Freq & Ratio key until FREQUENCY 2 is displayed to select
Channel 2 for frequency measurements.
For the HP 53131A, verify a reading of 10.000,000,00 MHz.
For the HP 53132A, verify a reading of 10.000,000,000 MHz.

11

For HP 53131A/132A, mark Pass or Fail in the HP 53131A/132A
Performance Test Record on page 1-41, Test 3.
Assembly-Level Service Guide

1-7

Chapter 1 Performance Tests
HP 53131A/132A/181A Operational Verification

1

Run Self Test
1

Disconnect the input signals from the Counter.

2

Power down (turn off the Counter), press and hold Recall (Utility)
key, then press POWER key.

3

Press Recall key until TEST: ALL ? is displayed.

4

Press Enter key.
Observe that ALL: PASS is displayed after the self test is completed.
If ALL: FAIL is displayed or a failure is indicated, refer to the
troubleshooting section in Chapter 2, “Service,” of this guide.

5

For HP 53131A/132A, mark Pass or Fail in the HP 53131A/132A
Performance Test Record on page 1-41, Test 4.

5’

For HP 53181A, mark Pass or Fail in the HP 53181A Performance
Test Record on page 1-71, Test 3.

Termination Check
1

Cycle the POWER key to preset the Counter.

2

Connect a digital voltmeter (DVM) to CHANNEL 1 as shown in
Figure 1-2, and set it to measure ohms (set DVM to appropriate
Ω range).

Counter

HP 3458A
Digital Multimeter

BNC - to - Dual
Banana Plug

HP 53131A/132A is shown in above figure. This setup for the HP 53181A requires a connection to Channel 1 only.

Figure 1-2. Termination Check Setup
1-8

Assembly-Level Service Guide

Chapter 1 Performance Tests
HP 53131A/132A/181A Operational Verification

3

Press Channel 1 50Ω/1MΩ key.
The LED turns on, indicating a 50Ω input impedance for Channel 1.

1

4

Press Channel 1 DC/AC key.
The LED turns on, indicating DC input coupling for Channel 1.

5

Verify the DVM reads 51.1Ω ± 3Ω.

6

For HP 53131A/132A, mark Pass or Fail in the HP 53131A/132A
Performance Test Record on page 1-41, Test 5a.

6’

For HP 53181A, mark Pass or Fail in the HP 53181A Performance
Test Record on page 1-71, Test 4a.

7

Press Channel 1 50Ω/1MΩ key.
The LED turns off, indicating a 1 MΩ input impedance for Channel 1.

8

Verify the DVM reads approximately 1.0000000 MOHM.

9

For HP 53131A/132A, mark Pass or Fail in the HP 53131A/132A
Performance Test Record on page 1-41, Test 5b.

9’

For HP 53181A, mark Pass or Fail in the HP 53181A Performance
Test Record on page 1-71, Test 4b.

10

Repeat steps 3 through 9 for Channel 2 for the HP 53131A/132A
Counter ONLY since the HP 53181A Counter does not have a
standard Channel 2.

11

For HP 53131A/132A, mark Pass or Fail in the HP 53131A/132A
Performance Test Record on page 1-41, Tests 6a and 6b.

12

Disconnect the test setup.

Assembly-Level Service Guide

1-9

Chapter 1 Performance Tests
HP 53131A/132A/181A Operational Verification

External Arm Test (HP 53131A/132A Only)

1

This test verifies the External Arm port of the HP 53131A and HP 53132A
Counter is operational.

Equipment
HP 8663A Synthesized Signal Generator
HP 8130A Pulse Generator (or equivalent)
HP 10100C 50Ω Feedthrough
HP 10503A BNC Cables (2)
HP 1250-0780 N-to-BNC Connector

Counter Setup
1

Cycle the POWER key to preset the Counter.

2

Set the Counter as follows:
Other Meas, TOTALIZE 1
Gate & ExtArm, GATE: EXTERNL (ENTER)

3

Set CHANNEL 1 input conditions to:
Trigger/Sensitivity, AUTO TRG: ON
Trigger/Sensitivity, LEVEL: 50 PCT
50Ω/1MΩ, 50Ω
DC/AC, DC
X10 Attenuator, Off
100kHz Filter, Off

1-10

Assembly-Level Service Guide

Chapter 1 Performance Tests
HP 53131A/132A/181A Operational Verification

Procedure
1

Set the Pulse Generator to the following:

2

1

PERIOD: 20 µs
WIDTH: 5 µs
High: 3.00 V Low : 0.8 V
Trailing/Leading : 1.0 ns
Input Mode: TRIG
Connect the equipment as shown in Figure 1-3.

HP 8130A
Pulse Generator

Output

HP 8663A
Synthesized Signal Generator

50Ω
Feedthrough
Ext Arm
(rear panel)

Counter

Channel 1

Output

N-to-BNC
Connector

Figure 1-3. External Arm Test Setup (HP 53131A/132A Only)

Assembly-Level Service Guide

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Chapter 1 Performance Tests
HP 53131A/132A/181A Operational Verification

Set the HP 8663A to output a 200 MHz, 100 mV sine wave signal to
Channel 1.

4

On the Counter, Press Run key.

5

Send a single pulse by pressing the MAN key on the HP 8130A, and
observe that with each press the Gate annunciator flashes.

1

3

The Counter should display approximately 1000.
6

For HP 53131A/132A, mark Pass or Fail in the HP 53131A/132A
Performance Test Record on page 1-41, Test 7.

7

Disconnect the test setup.

External Timebase Tests
These tests verify the External Timebase 1, 5, 10 MHz specifications of
the HP 53131A and HP 53181A Counters by checking that TIMEBASE
AUTO allows the Counter to be synchronized to the external reference.
Note that the HP 53132A only operates with the 10 MHz external
timebase; therefore, perform the procedure in the section titled
“10 MHz External Timebase Input for the HP 53132A” on page 1-15
to verify that TIMEBASE AUTO allows the Counter to be synchronized to
the external reference.

Equipment
HP 3325B Synthesizers (2)
HP 10100C 50W Feedthrough
HP 10503 BNC Cables (2)

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Assembly-Level Service Guide

Chapter 1 Performance Tests
HP 53131A/132A/181A Operational Verification

1 MHz External Timebase Input (HP 53131A and HP 53181A
Only)
1

Connect the equipment as shown in Figure 1-4.

1

HP 3325B
Synthesizer #1

50Ω
Feedthrough
Ref. In
(rear panel)

Output

HP 3325B
Synthesizer #2
Counter

Channel 1

Output

Figure 1-4. External Timebase Test Setup
2

Cycle the POWER key to preset the Counter.

3

Set Synthesizer #1 (i.e., the HP 3325B connected to the rear-panel
Ref In input of the Counter via a 50Ω feedthrough) to output a
1 MHz, 200 mV rms sine wave signal.

4

Set Synthesizer #2 (i.e., the HP 3325B connected to Channel 1) to
output a 2 MHz, 100 mV rms square wave signal.
Verify the Counter displays a reading of approximately 2 MHz and the
ExtRef annunciator is lit.

5

For HP 53131A, mark Pass or Fail in the HP 53131A/132A
Performance Test Record on page 1-41, Test 8a.

Assembly-Level Service Guide

1-13

Chapter 1 Performance Tests
HP 53131A/132A/181A Operational Verification

5’

For HP 53181A, mark Pass or Fail in the HP 53181A Performance
Test Record on page 1-71, Test 5a.

1

5 MHz External Timebase Input (HP 53131A and HP 53181A
Only)
1

Change the frequency of Synthesizer # 1, which is connected to
the Counter’s rear-panel Ref In input to 5 MHz.

2

On the Counter, press Run key.
Verify the Counter displays a reading of approximately 2 MHz and the
ExtRef annunciator is lit.

3

For HP 53131A, mark Pass or Fail in the HP 53131A/132A
Performance Test Record on page 1-41, Test 8b.

3’

For HP 53181A, mark Pass or Fail in the HP 53181A Performance
Test Record on page 1-71, Test 5b.

10 MHz External Timebase Input (HP 53131A and HP 53181A
Only)
1

Change the frequency of Synthesizer #1, which is connected to the
Counter’s rear-panel Ref In input to 10 MHz.

2

On the Counter, press Run key.
Verify the Counter displays a reading of approximately 2 MHz and the
ExtRef annunciator is lit.

3

For HP 53131A, mark Pass or Fail in the HP 53131A/132A
Performance Test Record on page 1-41, Test 8c.

3’

For HP 53181A, mark Pass or Fail in the HP 53181A Performance
Test Record on page 1-71, Test 5c.

4

Disconnect the test setup.
This completes the Operational Verification for the HP 53131A and
HP 53181A.
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Assembly-Level Service Guide

Chapter 1 Performance Tests
HP 53131A/132A/181A Operational Verification

10 MHz External Timebase Input for the HP 53132A
Connect the equipment as shown in Figure 1-4.

2

Set Synthesizer #1 (i.e., the HP 3325B that is connected to the
rear-panel Ref In input of the Counter via a 50Ω feedthrough) to
output a 10 MHz, 200 mV rms sine wave signal.

3

Set Synthesizer #2 (i.e., the HP 3325B that is connected to
Channel 1) to output a 2 MHz, 100 mV rms square wave signal.
Verify the Counter displays a reading of approximately 2 MHz and the
ExtRef annunciator is lit.

4

Mark Pass or Fail in the HP 53131A/132A Performance Test
Record on page 1-41, Test 8d.

5

Disconnect the test setup.
This completes the Operational Verification for the HP 53132A.

Assembly-Level Service Guide

1-15

1

1

Chapter 1 Performance Tests
HP 53131A/132A Complete Performance Tests

1

HP 53131A/132A Complete Performance
Tests
The specifications of the HP 53131A/132A Universal Counter can be
verified by performing the performance tests provided in this section.
Table 1-2 lists a summary of the HP 53131A/132A performance tests.
Record the results of the performance tests in the appropriate
place on HP 53131A/132A Performance Test Record, which starts
on page 1-41.
(Note: the complete performance tests for the HP 53181A Frequency
Counter begin on page 1-47 of this chapter.)

NOTE

To perform valid testing of the specifications, warm up the Counter and
test equipment for 30 minutes.
Table 1-2. The HP 53131A/132A Performance Tests
Page Number

*Test

page 1-17

Test 1: Time Interval (HP 53131A/132A Only)

page 1-19

Test 2: Trigger Level (HP 53131A/132A Only)

page 1-22

Test 3: Channels 1 and 2 Frequency Sensitivity
(HP 53131A/132A Only)

page 1-27

Test 4: Channels 1 and 2 Frequency Accuracy
(HP 53131A/132A Only)

page 1-30

Test 5: Option 030/050/124 Channel 3 Frequency Sensitivity
(HP 53131A/132A Only)

page 1-35

Test 6: Option 030/050/124 Channel 3 Frequency Accuracy
(HP 53131A/132A Only)

page 1-37

Test 7: Peak Volts, Channels 1 and 2 (HP 53131A/132A Only)

page 1-40

HP 53131A/132A HP-IB Verification Program (Optional)

Description

* Other Counter measurement functions (e.g., Period) are mathematically derived by the microprocessor from
the parameters verified by these performance tests. If the Counter passes the performance tests, the other
measurement functions are functioning to specifications.

1-16

Assembly-Level Service Guide

Chapter 1 Performance Tests
Test 1: Time Interval (HP 53131A/132A Only)

Test 1: Time Interval (HP 53131A/132A Only)

Equipment
HP 8130A Pulse Generator (or equivalent)
HP 10503A BNC Cable

Counter Setup
1

Cycle the POWER key to preset the Counter.

2

Press Time & Period key until TI 1 TO 2 is displayed.

3

Set CHANNEL 1 input conditions to:
Trigger/Sensitivity, AUTO TRG: OFF
Trigger/Sensitivity, LEVEL: .500V (Enter)
Trigger/Sensitivity, COMMON 1: ON
50Ω/1MΩ, 50Ω
DC/AC, DC
X10 Attenuate, Off
100kHz Filter, Off

4

Set CHANNEL 2 input conditions to:
Trigger/Sensitivity, AUTO TRG: OFF
Trigger/Sensitivity, LEVEL: .500V (Enter)
Trigger/Sensitivity, SLOPE: NEG
50Ω/1MΩ, 50Ω
DC/AC, DC
X10 Attenuate, Off
100kHz Filter, Off

Assembly-Level Service Guide

1-17

1

This test verifies the Time Interval specifications between Channels 1 and 2.

Chapter 1 Performance Tests
Test 1: Time Interval (HP 53131A/132A Only)

Procedure
Connect the pulse generator signal to Channel 1 of the Counter as
shown in Figure 1-5.

1

1

HP53131A/132
Counter

HP 8130A
Pulse Generator

Channel 1

Output

Figure 1-5. Time Interval (Channel 1 TO 2) Test Setup
2

Set the Pulse Generator to the following:
PERIOD: 10 µs
WIDTH: 150 ns
High: 1.00 V Low : 0.00 V
Input Mode: Normal

3

On the Counter, Press Single/Stop key.
The HP 53131A Counter should display 0.1500 µs ±0.0040 µs.
The HP 53132A Counter should display 0.1500 µs ±0.0025 µs.

4

Record this value in the appropriate place in the Performance
Test Record (Test 1, Line 1 for HP 53131A or Test 1, Line 2 for
HP 53132A).

5

Disconnect the test setup.

1-18

Assembly-Level Service Guide

Chapter 1 Performance Tests
Test 2: Trigger Level (HP 53131A/132A Only)

Test 2: Trigger Level (HP 53131A/132A Only)
1

This test verifies the Trigger Level accuracy of the HP 53131A and
HP 53132A Universal Counters.

Equipment
HP 3325B Synthesizer
HP 10503A BNC Cable

Counter Setup
1

Cycle the POWER key to preset the Counter.

2

Set CHANNEL 1 input conditions to:
Trigger/Sensitivity, AUTO TRG: OFF
Trigger/Sensitivity, LEVEL: 0.000V
50Ω/1MΩ, 50Ω
DC/AC, DC
X10 Attenuate, Off
100kHz Filter, Off

3

Set CHANNEL 2 input conditions to:
Trigger/Sensitivity, AUTO TRG: OFF
Trigger/Sensitivity, LEVEL: 0.000V
50Ω/1MΩ, 50Ω
DC/AC, DC
X10 Attenuate, Off
100kHz Filter, Off

Assembly-Level Service Guide

1-19

Chapter 1 Performance Tests
Test 2: Trigger Level (HP 53131A/132A Only)

Procedure
Connect the output of the HP 3325B to Channel 1 of the Counter
as shown in Figure 1-6.

1

1

HP 53131A/132A
Counter

Channel 1

HP 3325B
Synthesizer

Channel 2

Output

Figure 1-6. Trigger Level Test Setup
2

Set the HP 3325B to output a 1 MHz, 80 mVp-p square wave signal.

3

Set the HP 3325B DC OFFSET to −60 mV.

4

On the Counter, press Run key.

5

Now, increment the dc offset on the HP 3325B by +1 mV until the
Counter’s Gate annunciator flashes and continue incrementing
until the Counter displays a stable reading of approximately
1 MHz.
Observe the offset value on the display of the HP 3325B.
Record the dc offset value__________ mV.

6

Add the upper peak voltage (40 mV) of the 80 mV p-p signal to the
offset value in step 5 (For example, −24 mV + 40 mV = 16 mV).
This is the upper hysteresis level.
Record the upper hysteresis level__________ mV.
1-20

Assembly-Level Service Guide

Chapter 1 Performance Tests
Test 2: Trigger Level (HP 53131A/132A Only)

In the Counter’s Channel 1 Trigger/Sensitivity menu, change the
SLOPE to NEG.

8

Set the HP 3325B DC OFFSET to +60 mV.

9

On the Counter, press Run key.

10

1

7

Now, decrement the offset on the HP 3325B by −1 mV until the
Counter’s Gate annunciator flashes and continue decrementing
until the Counter displays a stable reading of approximately
1 MHz.
Observe the offset value on the display of the HP 3325B.
Record the value__________ mV.

11

Add the lower peak voltage (−40mV) of the 80 mVp-p signal to the
offset value in step 10 (for example, 21 mV − 40 mV = −19 mv.)
This result is the lower hysteresis level.
Record the lower hysteresis level __________ mV.

12

Now, add the upper hysteresis value (recorded in step 6) and
lower hysteresis value (recorded in step 11).
This is the trigger level; it should be 0.0 V ±15 mV.

13

Record the trigger level value in the appropriate place in the
Performance Test Record (Test 2, Line 1).

14

Repeat steps 1 through 13 for Channel 2.

15

Record the trigger level value in the appropriate place in the
Performance Test Record (Test 2, Line 2).

16

Disconnect the test setup.

Assembly-Level Service Guide

1-21

Chapter 1 Performance Tests
Test 3: Channels 1 and 2 Frequency Sensitivity (HP 53131A/132A Only)

1

Test 3: Channels 1 and 2 Frequency
Sensitivity (HP 53131A/132A Only)
This set of tests verifies frequency sensitivity specifications of the
HP 53131A and 53132A Universal Counters.

Equipment
HP 8663A Synthesized Signal Generator
HP 1250-0780 Type N-to-BNC Connector
HP 10100C 50Ω Feedthrough
HP 10503A BNC Cables (2)

Counter Setup
1

Cycle the POWER key to preset the Counter.

2

Set CHANNEL 1 input conditions to:
Trigger/Sensitivity, AUTO TRG: OFF
Trigger/Sensitivity, LEVEL: 0.000 V
50Ω/1MΩ, 50Ω
DC/AC, DC
X10 Attenuate, Off
100kHz Filter, Off

3

Set CHANNEL 2 input conditions to:
Trigger/Sensitivity, AUTO TRG: OFF
Trigger/Sensitivity, LEVEL: 0.000 V
50Ω/1MΩ, 50Ω
DC/AC, DC
X10 Attenuate, Off
100kHz Filter, Off

1-22

Assembly-Level Service Guide

Chapter 1 Performance Tests
Test 3: Channels 1 and 2 Frequency Sensitivity (HP 53131A/132A Only)

100 kHz to 100 MHz Sensitivity for HP 53131A/132A
1

For this test, make sure you always use the unit (HP 53131A/132A or
HP 8663A) that contains the better 10 MHz timebase as the output source
as shown in Figure 1-7.

HP 53131A/132A
Counter

50Ω
Feedthrough
Ref. In
(rear panel)

HP 8663A
Synthesized
Signal Generator

Output
(rear panel)

N-to-BNC
Connector
Channel 1

Output

OR
HP 8663A
Synthesized
Signal Generator
HP 53131A/132A
Counter

Input
(rear panel)

50Ω
Feedthrough
10 MHz
Output
(rear panel)

Channel 1

N-to-BNC
Connector
Output

Figure 1-7. Channels 1 and 2 Frequency Sensitivity Test Setup
Assembly-Level Service Guide

1-23

1

Connect the timebase output of the unit with the better timebase
to the timebase reference input of the other unit as shown in
Figure 1-7.

Chapter 1 Performance Tests

1

Test 3: Channels 1 and 2 Frequency Sensitivity (HP 53131A/132A Only)

2

Set the HP 8663A Signal Generator to output a 100 MHz,
−35.0 dBm sine wave signal (−20.0 dBm for Option 060 Rear
Terminals) to the Counter’s Channel 1 input.

3

On the Counter, press Run key.

4

In 0.1 dB steps, increase the power level until the Counter
displays a stable reading of 100 MHz.
The Counter should display 100 MHz when the signal generator level is
≤ −21.0 dBm (20 mVrms). Counters with Option 060 should display
100 MHz when the signal generator level is ≤ −9.5 dBm (75 mVrms).

5

Sweep the frequency from 100 MHz to 100 kHz. For Option 060,
sweep frequencies from 225 MHz to 100 kHz.
The Counter should read frequencies from 100 MHz to 100 kHz at an
input power level of ≤ −21.0 dBm (20 mVrms). Counters with
Option 060 should read frequencies from 225 MHz to 100 kHz at ≤ −
9.5 dBm (75 mVrms).

6

Record the actual reading in the appropriate place in the
Performance Test Record (Test 3, Line 1).
If you are testing a Counter with front-panel terminals (Standard),
record the reading on Line 1 of the Standard portion of the test record.
If you are testing a Counter with rear terminals (Option 060),
record the reading on Line 1 of the Option 060 portion of the test record.
DO NOT test the front terminals if rear terminals are installed. The front
terminal performance is not specified when the rear terminals are installed.

NOTE

7

Connect the HP 8663A to Channel 2 of the Counter.

8

On the Counter, press Freq & Ratio key until FREQUENCY 2 is
displayed.

9

Repeat steps 2 through 5 for Channel 2.
1-24

Assembly-Level Service Guide

Chapter 1 Performance Tests
Test 3: Channels 1 and 2 Frequency Sensitivity (HP 53131A/132A Only)

10

Record the actual reading in the appropriate place in the
Performance Test Record (Test 3, Line 2).

If you are testing a Counter with rear terminals (Option 060),
record the reading on Line 2 of the Option 060 portion of the test record.
The remaining sensitivity procedures are NOT required for Counters that
contain Option 060 Rear Terminals; thus, this completes the sensitivity
portion of the Frequency Performance Test. Go to the Frequency Accuracy
Test on page 1-27.

NOTE

100 MHz to 200 MHz Sensitivity for HP 53131A/132A
1

Leave the signal generator connected to Channel 2. Change the
signal generator settings to 200 MHz at −30 dBm.

2

On the Counter, press Run key.

3

Increase the power level by 0.1 dB steps until the Counter
displays a stable 200 MHz reading.
The Counter should display 200 MHz when the input signal level is
≤ −17.5 dBm (30 mVrms).

4

Sweep the signal generator frequency from 200 MHz to 100 MHz.
The Counter should read frequencies from 200 MHz to 100 MHz when the
input signal level is ≤ −17.5 dBm (30 mVrms).

5

Record the actual reading in the Performance Test Record
(Test 3, Line 3).

6

Connect the signal generator to Channel 1.

7

On the Counter, press Freq & Ratio key until Frequency 1 is
displayed.
Assembly-Level Service Guide

1-25

1

If you are testing a Counter with front-panel terminals (Standard),
record the reading on Line 2 of the Standard portion of the test record.

Chapter 1 Performance Tests
Test 3: Channels 1 and 2 Frequency Sensitivity (HP 53131A/132A Only)

Repeat steps 1 through 4 for Channel 1.

9

Record the actual reading in the Performance Test Record
(Test 3, Line 4).

1

8

200 MHz to 225 MHz Sensitivity for HP 53131A/132A
1

Leave the signal generator connected to Channel 1. Change the
signal generator settings to 225 MHz at −30 dBm.

2

On the Counter, press Run key.

3

Increase the power level by 0.1 dB steps until the Counter
displays a stable reading of 225 MHz.
The Counter should read 225 MHz when the input signal level is
≤ −15.0 dBm (40 mVrms).

4

Sweep the signal generator frequency from 225 MHz to 200 MHz.
The Counter should read frequencies from 225 MHz to 200 MHz when the
input signal level is ≤ −15.0 dBm (40 mVrms).

5

Record the actual reading in the Performance Test Record
(Test 3, Line 5).

6

Connect the signal generator to Channel 2.

7

On the Counter, press Freq & Ratio key until Frequency 2 is
displayed.

8

Repeat steps 1 through 4 for Channel 2.

9

Record the actual reading in the Performance Test Record
(Test 3, Line 6).

10

Disconnect the test setup.

1-26

Assembly-Level Service Guide

Chapter 1 Performance Tests
Test 4: Channels 1 and 2 Frequency Accuracy (HP 53131A/132A Only)

This set of tests verifies the frequency accuracy specifications of the
HP 53131A and HP 53132A Universal Counters.

Equipment
HP 8663A Synthesized Signal Generator
HP 1250-0780 Type N-to-BNC Connector
HP 10100C 50Ω Feedthrough
HP 10503A BNC Cables (2)

Counter Setup
1

Cycle the POWER key to preset the Counter.

2

Using the Gate & ExtArm key, set the gate time to TIME 1.000 s.

3

Set CHANNEL 1 input conditions to:
Trigger/Sensitivity, AUTO TRG: OFF
Trigger/Sensitivity, LEVEL: 0.000 V
50Ω/1MΩ, 50Ω
DC/AC, DC
X10 Attenuate, Off
100kHz Filter, Off

4

Set CHANNEL 2 input conditions to:
Trigger/Sensitivity, AUTO TRG: OFF
Trigger/Sensitivity, LEVEL: 0.000 V
50Ω/1MΩ, 50Ω
DC/AC, DC
X10 Attenuate, Off
100kHz Filter, Off

Assembly-Level Service Guide

1-27

1

Test 4: Channels 1 and 2 Frequency Accuracy
(HP 53131A/132A Only)

Chapter 1 Performance Tests
Test 4: Channels 1 and 2 Frequency Accuracy (HP 53131A/132A Only)

Procedure
Connect the equipment as shown in Figure 1-8 with the signal
generator connected to Channel 1 of the Counter.

1

1

Input
(rear panel)

50Ω
Feedthrough
Ref. In
(rear panel)

HP 8663A
Synthesized Signal Generator

HP 53131A/132A
Counter

Channel 2
Channel 1

Output

N-to-BNC
Connector

Figure 1-8. Channels 1 and 2 Frequency Accuracy Test Setup
2

Set the Signal Generator to output 1 MHz at −7 dBm.

3

On the Counter, press Run key.
Verify the HP 53131A Counter reads 1 MHz ±1 mHz.
Verify the HP 53132A Counter reads 1 MHz ±200 µHz.

4

Record the actual reading in the appropriate place in the
Performance Test Record (Test 4, Line 1 for HP 53131A or Test 4,
Line 3 for HP 53132A.

1-28

Assembly-Level Service Guide

Chapter 1 Performance Tests
Test 4: Channels 1 and 2 Frequency Accuracy (HP 53131A/132A Only)

5

Change the signal generator frequency to 100 MHz.
Verify the HP 53131A Counter reads 100 MHz ±70 mHz.

1

Verify the HP 53132A Counter reads 100 MHz ±15 mHz.
6

Record the actual reading in the appropriate place in the
Performance Test Record (Test 4, Line 5 for HP 53131A or Test 4,
Line 7 for HP 53132A).

7

Change the signal generator frequency to 200 MHz.
Verify the HP 53131A Counter reads 200 MHz ±130 mHz.
Verify the HP 53132A Counter reads 200 MHz ±30 mHz.

8

Record the actual reading in the appropriate place in
Performance Test Record (Test 4, Line 9 for HP 53131A or Test 4,
Line 11 for HP 53132A).

9

Change the signal generator frequency to 225 MHz.
Verify the HP 53131A Counter reads 225 MHz ±150 mHz.
Verify the HP 53132A Counter reads 225 MHz ±35 mHz.

10

Record the actual reading in the appropriate place in the
Performance Test Record (Test 4, Line 13 for HP 53131A or Test 4,
Line 15 for HP 53132A).

11

Connect the signal generator to Channel 2.

12

On the Counter, press Freq & Ratio key until Frequency 1 is
displayed.

13

Repeat steps 2 through 9 for Channel 2.

14

Record the actual readings in the appropriate places in the
Performance Test Record.

15

Disconnect the test setup.
Assembly-Level Service Guide

1-29

Chapter 1 Performance Tests
Test 5: Option 030/050/124 Channel 3 Frequency Sensitivity (HP
53131A/132A Only)

1

Test 5: Option 030/050/124 Channel 3
Frequency Sensitivity (HP 53131A/132A
Only)
This test verifies the frequency range, and sensitivity of the optional
3-GHz and 5-GHz Channel 3 (Option 030/050/124) for the HP 53131A and
the HP 53132A Universal Counters.

Equipment
HP 8663A Synthesized Signal Generator (not needed for Option 050)
HP 8340B Sweep Oscillator
HP 1250-0780 Type N-to-BNC Connector (not needed for Option 050)
HP 10503A BNC Cable(2)
HP 10100C 50Ω Feedthrough
HP 11500D N-N Cable (Option 050 only)
HP 1250-1250 N(M) to SMA(F)
HP 1250-0777 N(F) to N(F)

Counter Setup
1

Cycle the POWER key to preset the Counter.

2

Set the Counter as follows:
Freq & Ratio, FREQUENCY 3

1-30

Assembly-Level Service Guide

Chapter 1 Performance Tests
Test 5: Option 030/050/124 Channel 3 Frequency Sensitivity (HP
53131A/132A Only)

100 MHz to 2.5 GHz Sensitivity for HP 53131A/132A
Option 030 only
1

Frequency Standard
(switch set to EXT)

HP 8340B
Sweep Oscillator

Output
Input
(rear panel)

HP 8663A
Synthesized Signal Generator
HP 53131A/132A
Counter

50Ω
Feedthrough
Ref. In
(rear panel)

Channel 3

Output

N-to-BNC
Connector

Figure 1-9. Option 030/050/124 Channel 3 Frequency Sensitivity and Accuracy Test Setup
2

On the Counter, Press Run key.

Assembly-Level Service Guide

1-31

1

Set the HP 8663B Synthesized Signal Generator to output a
2500 MHz, −40 dBm sine wave, and connect the signal to Channel 3
of the Counter as shown in Figure 1-9.

Chapter 1 Performance Tests
Test 5: Option 030/050/124 Channel 3 Frequency Sensitivity (HP
53131A/132A Only)

3

Increase the power level in 5 dB steps until the Counter displays a
stable reading of approximately 2.5 GHz.

1

The Counter should display 2.5 GHz at ≤ −27.0 dBm (10 mVrms).
4

Sweep the frequencies from 2.5 GHz to 200 MHz.
The Counter should read frequencies from 2.5 GHz to 200 MHz at
≤ −27.0 dBm (10 mVrms).

5

Record the actual reading in the Performance Test Record
(Test 5, Line 1).

2.7 to 3.0 GHz Sensitivity for Option 030 only
1

Disconnect the HP 8663A Synthesized Signal Generator from the
Counter (see Figure 1-9), and connect the HP 8340B Sweep
Oscillator to Channel 3 of the Counter.

2

Change the settings of the Sweep Oscillator to 3.0 GHz, −40 dBm.

3

Increase the power level in 1 dB steps until the Counter displays a
stable reading of approximately 3.0 GHz.
The Counter should display 3.0 GHz at ≤ −21.0 dBm.

4

Sweep the frequencies from 3.0 GHz to 2.7 GHz.
The Counter should read frequencies from 3.0 to 2.7 GHz at ≤ −21.0 dBm.

5

Record the actual reading in the Performance Test Record
(Test 5, Line 2).

6

Disconnect the test setup.

1-32

Assembly-Level Service Guide

Chapter 1 Performance Tests
Test 5: Option 030/050/124 Channel 3 Frequency Sensitivity (HP
53131A/132A Only)

200 MHz to 5.0 GHz Sensitivity for HP 53131A/132A
(Option 050 only)
Connect the 8340B Sweep Oscillator to Channel 3 of the counter.

2

Change the settings of the Sweep Oscillator to 5.0 GHz, −40 dBm.

3

Increase the power level in 1 dB steps until the Counter displays a
stable reading of approximately 5.0 GHz.

1

1

The Counter should display 5.0 GHz at ≤ −23 dBm.
Use a power meter and sensor to ensure the accuracy of the power being
input.

NOTE

4

Sweep the frequencies from 200 MHz to 5.0 GHz.
The Counter should read frequencies from 200 MHz to 5.0 GHz at ≤ −3 dBm.

5

Record the actual reading in the Performance Test Record
(Test 5, Line 3).

6

Disconnect the test setup.

Assembly-Level Service Guide

1-33

Chapter 1 Performance Tests
Test 5: Option 030/050/124 Channel 3 Frequency Sensitivity (HP
53131A/132A Only)

200 MHz to 12.4 GHz Sensitivity for HP 53131A/132A
(Option 124 only)
Connect the 8340B Sweep Oscillator to Channel 3 of the counter.

2

Change the settings of the Sweep Oscillator to 12.4 GHz, −40 dBm.

3

Increase the power level in 1 dB steps until the Counter displays a
stable reading of approximately 12.4 GHz.

1

1

The Counter should display 12.4 GHz at ≤ −23 dBm.
Use a power meter and sensor to ensure the accuracy of the power being
input.

NOTE

4

Sweep the frequencies from 200 MHz to 12.4 GHz.
The Counter should read frequencies from 200 MHz to 12.4 GHz
at ≤ −3 dBm.

5

Record the actual reading in the Performance Test Record
(Test 5, Line 4).

6

Disconnect the test setup.

1-34

Assembly-Level Service Guide

Chapter 1 Performance Tests
Test 6: Option 030/050/124 Channel 3 Frequency Accuracy
(HP 53131A/132A Only)

This test verifies the frequency accuracy of the optional 3-GHz or 5-GHz
Channel 3 (Option 030).

Equipment
HP 8663A Synthesized Signal Generator (Option 030 only)
HP 8340B Sweep Oscillator
HP 1250-0780 Type N-to-BNC Connector (Option 030 only)
HP 10503A BNC Cable (2)
HP 10100C 50Ω Feedthrough
HP 11500D N-N Cable (Option 050 only)
HP 1250-1250 N(M) to SMA(F)
HP 1250-0777 N(F) to N(F)

Counter Setup
1

Cycle the POWER key to preset the Counter.

2

Set the Counter as follows:
Freq & Ratio, FREQUENCY 3
Gate & ExtArm, TIME: TIME 1.000 s

Procedure
1

Connect equipment as shown in Figure 1-9.
(NOTE: For Options 050 and 124, skip steps 2 through 5.
Proceed to step 6.)

2

Set the HP 8663A Synthesized Signal Generator to output
100 MHz at −17.0 dBm.

Assembly-Level Service Guide

1-35

1

Test 6: Option 030/050/124 Channel 3
Frequency Accuracy (HP 53131A/132A Only)

Chapter 1 Performance Tests
Test 6: Option 030/050/124 Channel 3 Frequency Accuracy
(HP 53131A/132A Only)

3

On the Counter, press Run key.
Verify the HP 53131A Counter reads 100 MHz ±70 mHz.

1

Verify the HP 53132A Counter reads 100 MHz ±20 mHz.
4

Record the actual reading in the Performance Test Record
(Test 6, Line 1 for HP 53131A or Test 6, Line 2 for HP 53132A).

5

Disconnect the HP 8663A output from Channel 3 of the Counter,
and connect the HP 8340B Sweep Oscillator output to Channel 3
of the Counter as shown in Figure 1-9.

6

Set the HP 8340B to output 3.0 GHz at −17.0 dBm.
Verify the HP 53131A Counter reads 3.0 GHz ±2 Hz.
Verify the HP 53132A Counter reads 3.0 GHz ±0.4 Hz.

7

Record the actual reading in the Performance Test Record
(Test 6, Line 3 for HP 53131A or Test 6, Line 4 for HP 53132A).

8

Set the HP 8340B to output 5.0 GHz at −17 dBm.
Verify the HP 53131A Counter reads 5.0 GHz ±3 Hz.
Verify the HP 53132A Counter reads 5.0 GHz ±0.7 Hz.

9

10

Record the actual reading in the Performance Test Record
(Test 6, Line 5 for HP 53131A or Test 6, Line 6 for HP 53132A).
Set the HP 8340B to output 12.4 GHz at −17 dBm. (This step is for
Option 124 only.)
Verify the HP 53131A Counter reads 12.4 GHz ±8 Hz.
Verify the HP 53132A Counter reads 12.4 GHz ±2 Hz.

11

Record the actual reading in the Performance Test Record
(Test 6, Line 7 for HP 53131A or Test 6, Line 8 for HP 53132A.)

12

Disconnect the test setup.
1-36

Assembly-Level Service Guide

Chapter 1 Performance Tests
Test 7: Peak Volts, Channels 1 and 2 (HP 53131A/132A Only)

1

Test 7: Peak Volts, Channels 1 and 2
(HP 53131A/132A Only)
This test verifies the Peak Volts accuracy specification of the HP 53131A
and HP 53132A Universal Counters.

Equipment
HP 3325B Synthesizer
HP 10100C 50Ω Feedthrough
HP 10503A BNC Cable

Counter Setup
1

Cycle the POWER key to preset the Counter.

2

Press Other Meas key until VOLT PEAKS 1 is displayed.

3

Set CHANNEL 1 input to:
50Ω/1MΩ, 50Ω
X10 Attenuate, Off
100kHz Filter, Off

4

Set CHANNEL 2 input to:
50Ω/1MΩ, 50Ω
X10 Attenuate, Off
100kHz Filter, Off

Assembly-Level Service Guide

1-37

Chapter 1 Performance Tests
Test 7: Peak Volts, Channels 1 and 2 (HP 53131A/132A Only)

Volt Peak 1
Connect the equipment as shown in Figure 1-10.

1

1

HP 3325B
Synthesizer

HP 53131A/132A
Counter

Channel 2
Channel 1

Output

Figure 1-10. Peak Volts Test Setup
2

Set the HP 3325B to output a 2 MHz, 2 Vp-p sine wave.
The Counter should display −1.00 ±0.12V for the negative peak of the sine
wave. This reading is displayed on the left side of the display.
Record the actual reading in the Performance Test Record
(Test 7, Line 1a).
Also, the Counter should display +1.00 ±0.12V for the positive peak of the
sine wave. This reading is displayed on the right side of the display.
Record the actual reading in the Performance Test Record
(Test 7, Line 1b).

1-38

Assembly-Level Service Guide

Chapter 1 Performance Tests
Test 7: Peak Volts, Channels 1 and 2 (HP 53131A/132A Only)

Volt Peak 2
Remove the signal from Channel 1 of the Counter and connect it
to Channel 2.

2

Press Other Meas key until VOLT PEAK 2 is displayed.

1

1

The Counter should display -1.00 ±0.12V for the negative peak of the sine
wave. This reading is displayed on the left side of the display.
Record the actual reading in the Performance Test Record
(Test 7, Line 2a).
Also, the Counter should display +1.00 ±0.12V for the positive peak of the
sine wave. This reading is displayed on the right side of the display.
Record the actual reading in the Performance Test Record
(Test 7, Line 2b).
3

Disconnect the test setup.

Assembly-Level Service Guide

1-39

Chapter 1 Performance Tests
HP 53131A/132A HP-IB Verification Program (Optional)

1

HP 53131A/132A HP-IB Verification Program
(Optional)
The HP-IB Verification program exercises the HP 53131A/132A and
through various operating modes via the its HP-IB interface. If the
Counter successfully completes all phases of the verification program,
there is a high probability that the HP-IB interface is operating correctly.
If the Counter fails the verification program, refer to the troubleshooting
section in Chapter 2, “Service,” of this guide.
The HP-IB Verification program may be loaded into the HP 9000
series 200 or 300 Desktop Computer from the 3 1/2-inch disk
(HP P/N 53131-13501) or the 5 1/4-inch disk (HP P/N 53131-13502).
1

To run the program on the disk, insert the disk into the Desktop
Computer, load the program by typing Load “VER31”, and press
RUN key on the computer’s keyboard.

2

Follow the instructions displayed in the computer’s screen.

3

After running this program, record the result (Pass or Fail) on the
last page (page 1-46) of the HP 53131A/132A Performance Test
Record.

1-40

Assembly-Level Service Guide

Chapter 1 Performance Tests
HP 53131A/132A Performance Test Record (Page 1 of 6)

1

HP 53131A/132A Performance Test Record
(Page 1 of 6)
Hewlett-Packard Model 53131A/132A Universal Counter
Serial Number: _________________________ Repair/Work Order No. _ ________________
Test Performed By: _____________________ Temperature: __________________________
Date: __________________________________ Relative Humidity: _____________________
Notes: _________________________________________________________________________
Test Number

Operational Verification

Test Results
Pass
Fail

1

Power on Self Test

q

q

2

Channel 1, 10 MHz Test

q

q

3

Channel 2, 10 MHz Test

q

q

4

Run Self Test

q

q

5a

Termination Check Ch 1, 50Ω

q

q

5b

Termination Check Ch 1, 1MΩ

q

q

6a

Termination Check Ch 2, 50Ω

q

q

6b

Termination Check Ch 2, 1MΩ

q

q

External Arm Test

q

q

8a

1 MHz External Timebase Input Test (HP 53131A Only)

q

q

8b

5 MHz External Timebase Input Test (HP 53131A Only)

q

q

8c

10 MHz External Timebase Input Test (HP 53131A Only)

q

q

8d

10 MHz External Timebase Input Test for the HP 53132A

q

q

7

Assembly-Level Service Guide

1-41

Chapter 1 Performance Tests
HP 53131A/132A Performance Test Record (Page 2 of 6)

1

HP 53131A/132A Performance Test Record
(Page 2 of 6)
Complete Performance Tests
Test
Number
1

2

Test Description

Minimum

Actual Reading

Maximum

Time Interval
(HP 53131A/132A
Only):
For HP 53131A

0.1460 µs

1. __________

0.1540 µs

For HP 53132A

0.1475 µs

2. __________

0.1525 µs

Channel 1

−15 mV

1. __________

+15 mV

Channel 2
(HP 53131A/132A Only)

−15 mV

2. __________

+15 mV

Trigger Level:

Test 3: Channels 1 and 2 Frequency Sensitivity (HP 53131A/132A Only)
Standard (Front Panel Terminals)

Actual Reading

Specification

100 kHz–100 MHz, Channel 1

1. __________

≤ −21 dBm (20 mVrms)

100 kHz–100 MHz, Channel 2

2. __________

≤ −21 dBm (20 mVrms)

100 MHz–200 MHz, Channel 2

3. __________

≤ −17.5 dBm (30 mVrms)

100 MHz–200 MHz, Channel 1

4. __________

≤ −17.5 dBm (30 mVrms)

200 MHz–225 MHz, Channel 1

5. __________

≤ −15.0 dBm (40 mVrms)

200 MHz–225 MHz, Channel 2

6. __________

≤ −15.0 dBm (40 mVrms)

Option 060 Rear Terminals

Actual Reading

Specification

100 kHz–225 MHz, Channel 1

1. __________

≤ −9.5 dBm (75 mVrms)

100 kHz–225 MHz, Channel 2

2. __________

≤ −9.5 dBm (75 mVrms)

1-42

Assembly-Level Service Guide

Chapter 1 Performance Tests
HP 53131A/132A Performance Test Record (Page 3 of 6)

1

HP 53131A/132A Performance Test Record
(Page 3 of 6)
Complete Performance Tests (Continued)
Test
Number
4

Test Description

Minimum

Actual
Reading

Maximum

Channels 1 and 2
Frequency
Accuracy
(HP 53131A/132A
Only)
1 MHz Test
(HP 53131A):
Channel 1

999,999.999 Hz

1. __________

1,000,000.001 Hz

Channel 2

999,999.999 Hz

2. __________

1,000,000.001 Hz

Channel 1

999,999.9998 Hz

3. __________

1,000,000.0002 Hz

Channel 2

999,999.9998 Hz

4. __________

1,000,000.0002 Hz

Channel 1

99.999,999,93 MHz

5. __________

100.000,000,07 MHz

Channel 2

99.999,999,93 MHz

6. __________

100.000,000,07 MHz

Channel 1

99.999,999,980 MHz

7. __________

100.000,000,020 MHz

Channel 2

99.999,999,980 MHz

8. __________

100.000,000,020 MHz

1 MHz Test
(HP 53132A):

4

100 MHz Test
(HP 53131A):

100 MHz Test
(HP 53132A):

Assembly-Level Service Guide

1-43

Chapter 1 Performance Tests
HP 53131A/132A Performance Test Record (Page 4 of 6)

1

HP 53131A/132A Performance Test Record
(Page 4 of 6)
Complete Performance Tests (Continued)
Test
Number
4

Test Description

Minimum

Actual
Reading

Maximum

200 MHz Test
(HP 53131A):
Channel 1

199.999,999,87 MHz

9. __________

200.000,000,13 MHz

Channel 2

199.999,999,87 MHz

10. __________

200.000,000,13 MHz

Channel 1

199.999,999,970 MHz

11. __________

200.000,000,03 MHz

Channel 2

199.999,999,970 MHz

12. __________

200.000,000,03 MHz

Channel 1

224.999,999,85 MHz

13. __________

225.000,000,15 MHz

Channel 2

224.999,999,85 MHz

14. __________

225.000,000,15 MHz

Channel 1

224.999,999,965 MHz

15. __________

225.000,000,035 MHz

Channel 2

224.999,999,965 MHz

16. __________

225.000,000,035 MHz

200 MHz Test
(HP 53132A):

4

225 MHz Test
(HP 53131A):

225 MHz Test
(HP 53132A):

Test 5: Option 030/050/124 Channel 3 Frequency Sensitivity (HP 53131A/132A Only)
Actual Reading

Specification

100 MHz–2.5 GHz

1. __________

≤ −27 dBm 10 mV rms

2.7–3.0 GHz

2. __________

≤ −21 dBm 20 mV rms

200 MHz–5.0 GHz

3. __________

≤ −23 dBm 16 mV rms

200 MHz–12.4 GHz

4. __________

≤ −23 dBm 16 mV rms

1-44

Assembly-Level Service Guide

Chapter 1 Performance Tests
HP 53131A/132A Performance Test Record (Page 5 of 6)

1

HP 53131A/132A Performance Test Record
(Page 5 of 6)
Complete Performance Tests (Continued)
Test
Number
6

Test Description

Minimum

Actual
Reading

Maximum

Option 030
Channel 3
Frequency
Accuracy
(HP 53131A/132A
Only)
100 MHz Test
(HP 53131A):
Channel 3

99.999,999,93 MHz

1. __________

100.000,000,07 MHz

99.999, 999,980 MHz

2. __________

100.000,000,020 MHz

2,999.999,998 MHz

3. __________

3,000.000,002 MHz

2,999.999,999,60 MHz

4. __________

3,000.000, 000,4 MHz

4,999.999,997,0 MHz

5. __________

5,000.000,003,0 MHz

4,999.999,999,3 MHz

6. __________

5,000.000, 000,7 MHz

100 MHz Test
(HP 53132A):
Channel 3
6

3.0 GHz Test
(HP 53131A):
Channel 3
3.0 GHz Test
(HP 53132A):
Channel 3

6

5.0 GHz Test
(HP 53131A):
Channel 3
5.0 GHz Test
(HP 53132A):
Channel 3

Assembly-Level Service Guide

1-45

Chapter 1 Performance Tests
HP 53131A/132A Performance Test Record (Page 6 of 6)

1

HP 53131A/132A Performance Test Record
(Page 6 of 6)
Complete Performance Tests (Continued)
Test
Number
6

Test Description

Minimum

Actual
Reading

Maximum

12.4 GHz Test
(HP 53131A):
Channel 3

12.399.999 992 MHz

7. __________

12,400.000 008 MHz

12,399.999 998 MHz

8. __________

12,400.000 002 MHz

12,399.999,982,0 MHz

7. __________

12,400.000 018, MHz

12,399.999,992,0 MHz

8. __________

12,400.000, 008,0 MHz

−1.12 V
+0.88 V

1 a.___________
b.___________

−0.88 V
+1.12V

−1.12 V
+0.88 V

2 a.___________
b.___________

−0.88 V
+1.12V

12.4 GHz Test
(HP 53132A):
Channel 3
6

12.4 GHz Test
(HP 53131A):
Channel 3
12.4 GHz Test
(HP 53132A):
Channel 3

7

Peak Volts,
Channels 1 and 2
(HP 53131A/132A
Only):
Volt Peak 1
Channel 1
Volt Peak 2
Channel 2

Complete Performance Tests (Continued)
HP-IB Verification (Optional)

Test Results
Pass
Fail
q

1-46

q

Assembly-Level Service Guide

Chapter 1 Performance Tests
HP 53181A Complete Performance Tests

HP 53181A Complete Performance Tests

Record the results of the performance tests in the appropriate
place on HP 53181A Performance Test Record, which starts on
page 1-71.
(Note: the complete performance tests for the HP 53131A/132A Universal
Counter begin on page 1-16 of this chapter.)

NOTE

To perform valid testing of the specifications, warm up the Counter and
test equipment for 30 minutes.
Table 1-3. The HP 53181A Performance Tests
Page Number

*Test

page 1-48

Test 1: Trigger Level (HP 53181A Only)

page 1-51

Test 2: Channel 1 Frequency Sensitivity (HP 53181A Only)

page 1-55

Test 3: Channel 1 Frequency Accuracy (HP 53181A Only)

page 1-58

Test 4: Option 015/030/050/124 Channel 2 Frequency
Sensitivity

page 1-63

Test 5: Option 015/030/050/124 Channel 2 Frequency
Accuracy (HP 53181A Only)

page 1-68

Test 6: Peak Volts, Channel 1 (HP 53181A Only)

page 1-70

HP 53181A HP-IB Verification Program (Optional)

Description

* Other Counter measurement functions (e.g., Period) are mathematically derived by the microprocessor from
the parameters verified by these performance tests.

Assembly-Level Service Guide

1-47

1

The specifications of the HP 53181A Frequency Counter can be verified
by performing the performance tests provided in this section. Table 1-3
lists a summary of the HP 53181A performance tests.

Chapter 1 Performance Tests
Test 1: Trigger Level (HP 53181A Only)

Test 1: Trigger Level (HP 53181A Only)
1

This test verifies the Trigger Level accuracy of the HP 53181A Frequency
Counter.

Equipment
HP 3325B Synthesizer
HP 10503A BNC Cable

Counter Setup
1

Cycle the POWER key to preset the Counter.

2

Set CHANNEL 1 input condition to:
Trigger/Sensitivity, AUTO TRG: OFF
Trigger/Sensitivity, LEVEL: 0.000V
50Ω/1MΩ, 50Ω
DC/AC, DC
X10 Attenuate, Off
100kHz Filter, Off

1-48

Assembly-Level Service Guide

Chapter 1 Performance Tests
Test 1: Trigger Level (HP 53181A Only)

Procedure
1

Connect the output of the HP 3325B to Channel 1 of the Counter
as shown in Figure 1-11.

1

HP 53181A
Counter

HP 3325B
Synthesizer

Channel 1

Output

Figure 1-11. Trigger Level Test Setup
2

Set the HP 3325B to output a 1 MHz, 80 mVp-p square wave signal.

3

Set the HP 3325B DC OFFSET to −60 mV.

4

On the Counter, press Run key.

5

Now, increment the dc offset on the HP 3325B by +1 mV until the
Counter’s Gate annunciator flashes and continue incrementing
until the Counter displays approximately 1 MHz.
Observe the offset value on the display of the HP 3325B.
Record the dc offset value__________ mV.

6

Add the upper peak voltage (40 mV) of the 80 mV p-p signal to the
offset value in step 5 (For example, −24 mV + 40 mV = 16 mv).
This is the upper hysteresis level.
Record the upper hysteresis level__________ mV.

Assembly-Level Service Guide

1-49

Chapter 1 Performance Tests
Test 1: Trigger Level (HP 53181A Only)

In the Counter’s Channel 1 Trigger/Sensitivity menu, change the
SLOPE to NEG.

8

On the Counter, press Run key.

9

Set the HP 3325B DC OFFSET to +60 mV.

1

7

10

Now, decrement the offset on the HP 3325B by −1 mV until the
Counter’s Gate annunciator flashes and continue decrementing
until the Counter displays approximately 1 MHz.
Observe the offset value on the display of the HP 3325B.
Record the value__________ mV.

11

Add the lower peak voltage (−40mV) of the 80 mVp-p signal to the
offset value in step 10 (for example, 21 mV − 40 mV = −19 mV.)
This result is the lower hysteresis level.
Record the lower hysteresis level __________ mV.

12

Now, add the upper hysteresis value (recorded in step 6 )and
lower hysteresis value (recorded in step 11).
This is the trigger level; it should be 0.0 V ±15 mV.

13

Record the trigger level value in the Performance Test Record
(Test 1, Line 1).

1-50

Assembly-Level Service Guide

Chapter 1 Performance Tests
Test 2: Channel 1 Frequency Sensitivity (HP 53181A Only)

1

Test 2: Channel 1 Frequency Sensitivity
(HP 53181A Only)
This set of tests verifies frequency sensitivity specifications of the
HP 53181A Frequency Counter.

Equipment
HP 8663A Synthesized Signal Generator
HP 1250-0780 Type N-to-BNC Connector
HP 10100C 50Ω Feedthrough
HP 10503A BNC Cables (2)

Counter Setup
1

Cycle the POWER key to preset the Counter.

2

Set CHANNEL 1 input conditions to:
Trigger/Sensitivity, AUTO TRG: OFF
Trigger/Sensitivity, LEVEL: 0.000 V
50Ω/1MΩ, 50Ω
DC/AC, DC
X10 Attenuate, Off
100kHz Filter, Off

Assembly-Level Service Guide

1-51

Chapter 1 Performance Tests
Test 2: Channel 1 Frequency Sensitivity (HP 53181A Only)

100 kHz to 100 MHz Sensitivity for HP 53181A
Connect the equipment as shown in Figure 1-12 with the signal
generator connected to Channel 1 of the Counter.

1

1

Input
(rear panel)
BNC Tee

HP 53181A
Counter

50Ω
Feedthrough
Ref. In
(rear panel)

HP 8663A
Synthesized Signal Generator

Channel 1

Output

N-to-BNC
Connector

Figure 1-12. Channels 1 Frequency Sensitivity Test Setup
2

Set the HP 8663A Signal Generator to output a 100 kHz, −35.0 dBm
sine wave signal (−20.0 dBm for Option 060) to the Counter’s
Channel 1 input.

3

In 0.1 dB steps, increase the power level until the Counter
displays a stable reading of 100 kHz.
The Counter should display 100 kHz when the signal generator level
is ≤ −21.0 dBm (20 mVrms). Counters with Option 060 Rear Terminals
should display 100 kHz when the signal generator level is ≤ −9.5 dBm
(75 mVrms).

1-52

Assembly-Level Service Guide

Chapter 1 Performance Tests
Test 2: Channel 1 Frequency Sensitivity (HP 53181A Only)

4

Sweep the frequency from 100 kHz to 100 MHz. For Option 060,
sweep frequencies from 100 kHz to 225 MHz.

5

Record the actual reading in the Performance Test Record
(Test 2, Line 1).
If you are testing a Counter with front-panel terminals (Standard),
record the reading on Line 1 of the Standard portion of the test record.
If you are testing a Counter with rear terminals (Option 060),
record the reading on Line 1 of the Option 060 portion of the test record.

NOTE

DO NOT test the front terminals if rear terminals are installed. The front
terminal performance is not specified when the rear terminals are
installed.

NOTE

The remaining sensitivity procedures are NOT required for Counters that
contain Option 060 Rear Terminals; thus, this completes the sensitivity
portion of the Frequency Performance Test. Go to the Frequency Accuracy
Test on page 1-55.

Assembly-Level Service Guide

1-53

1

The Counter should read frequencies from 100 kHz to 100 MHz at an
input power level of ≤ −21.0 dBm (20 mVrms). Option 060 Counters should
read frequencies from 100 kHz to 225 MHz at ≤ −9.5 dBm (75 mVrms).

Chapter 1 Performance Tests
Test 2: Channel 1 Frequency Sensitivity (HP 53181A Only)

1

100 MHz to 200 MHz Sensitivity for HP 53181A
1

Change the signal generator settings to 110 MHz at −30 dBm.

2

Increase the power level by 0.1 dB steps until the Counter
displays a stable 110 MHz reading.
The Counter should read 200 MHz when the input signal level
is ≤ −17.5 dBm (30 mVrms).

3

Sweep the signal generator frequency from 100 MHz to 200 MHz.
The Counter should read frequencies from 100 MHz to 200 MHz when the
input signal level is ≤ −17.5 dBm (30 mVrms).

4

Record the actual reading in the Performance Test Record
(Test 2, Line 2).

200 MHz to 225 MHz Sensitivity for HP 53181A
1

Change the signal generator settings to 200 MHz at −30 dBm.

2

Increase the power level by 0.1 dB steps until the Counter
displays a stable 200 MHz reading.
The Counter should read 200 MHz when the input signal level is
≤ −15.0 dBm (40 mVrms).

3

Sweep the signal generator frequency from 200 MHz to 225 MHz.
The Counter should read frequencies from 200 MHz to 225 MHz when the
input signal level is ≤ −15.0 dBm (40 mVrms).

4

Record the actual reading in the Performance Test Record
(Test 2, Line 3).

5

Disconnect the test setup.

1-54

Assembly-Level Service Guide

Chapter 1 Performance Tests
Test 3: Channel 1 Frequency Accuracy (HP 53181A Only)

1

Test 3: Channel 1 Frequency Accuracy
(HP 53181A Only)
This set of tests verifies the frequency accuracy specifications of the
HP 53181A Frequency Counter.

Equipment
HP 8663A Synthesized Signal Generator
HP 8340B Sweep Oscillator
HP 1250-0780 Type N-to-BNC Connector
HP 10100C 50Ω Feedthrough
HP 10503A BNC Cables (2)

Counter Setup
1

Cycle the POWER key to preset the Counter.

2

Using the Gate & ExtArm key, set gate time to TIME 1.000 s.

3

Set CHANNEL 1 input conditions to:
Trigger/Sensitivity, AUTO TRG: OFF
Trigger/Sensitivity, LEVEL: 0.000 V
50Ω/1MΩ, 50Ω
DC/AC, DC
X10 Attenuate, Off
100kHz Filter, Off

Assembly-Level Service Guide

1-55

Chapter 1 Performance Tests
Test 3: Channel 1 Frequency Accuracy (HP 53181A Only)

Procedure
Connect the equipment as shown in Figure 1-13 with the signal
generator connected to Channel 1 of the Counter.

1

1

Frequency Standard
(switch set to EXT)

HP 8340B
Sweep Oscillator

Output
Input
(rear panel)

HP 8663A
Synthesized Signal Generator
HP 53181A
Counter

50Ω
Feedthrough
Ref. In
(rear panel)

Output

Channel 1

N-to-BNC
Connector

Figure 1-13. Channels 1 Frequency Accuracy Test Setup
2

Set the HP 8663A Signal Generator to output 1 MHz at −7 dBm.

3

On the Counter, press Run key.
Verify the Counter reads 1 MHz ±1 mHz.
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Assembly-Level Service Guide

Chapter 1 Performance Tests
Test 3: Channel 1 Frequency Accuracy (HP 53181A Only)

Record the actual reading in the Performance Test Record
(Test 3, Line 1).

5

Change the signal generator frequency to 100 MHz.

1

4

Verify the Counter reads 100 MHz ±70 mHz.
6

Record the actual reading in the Performance Test Record
(Test 3, Line 2).

7

Change the signal generator frequency to 200 MHz.
Verify the Counter reads 200 MHz ±130 mHz.

8

Record the actual reading in the Performance Test Record
(Test 3, Line 3).

9

Change the signal generator frequency to 225 MHz.
Verify the Counter reads 225 MHz ±150 mHz.

10

Record the actual reading in the Performance Test Record
(Test 3, Line 4).

11

Disconnect the test setup.

Assembly-Level Service Guide

1-57

Chapter 1 Performance Tests
Test 4: Option 015/030/050/124 Channel 2 Frequency Sensitivity

1

Test 4: Option 015/030/050/124 Channel 2
Frequency Sensitivity
This test verifies the frequency range and sensitivity of the optional
1.5-GHz (Option 015), 3-GHz (Option 030), 5.0-GHz (Option 050), or
12.4-GHz (Option 124) Channel 2 for the HP 53181A Frequency Counter.

Equipment
HP 8663A Synthesized Signal Generator (Not needed for Option 050/124)
HP 8340B Sweep Oscillator
HP 1250-0780 Type N-to-BNC Connector (Not needed for Option 050/124)
HP 10503A BNC Cable (2)
HP 10100C 50Ω Feedthrough

Counter Setup
1

Cycle the POWER key to preset the Counter.

2

Set the Counter as follows:
Freq & Ratio, FREQUENCY 2

1-58

Assembly-Level Service Guide

Chapter 1 Performance Tests
Test 4: Option 015/030/050/124 Channel 2 Frequency Sensitivity

100 MHz to 1.5 GHz Sensitivity for Option 015 Only
1

Frequency Standard
(switch set to EXT)

HP 8340B
Sweep Oscillator

Output
Input
(rear panel)

HP 8663A
Synthesized Signal Generator
HP 53181A
Counter

50Ω
Feedthrough
Ref. In
(rear panel)

Output

Channel 2

N-to-BNC
Connector

Figure 1-14. Option 015/030/050 Channel 2 Frequency Test
2

On the Counter, Press Run key.

Assembly-Level Service Guide

1-59

1

Set the HP 8663B Synthesized Signal Generator to output a
500 MHz, −60 dBm sine wave and connect the signal to Channel 2
of the Counter as shown in Figure 1-14.

Chapter 1 Performance Tests
Test 4: Option 015/030/050/124 Channel 2 Frequency Sensitivity

3

Increase the power level in 1 dB steps until the Counter reads
500 MHz.

1

The Counter should display 500 MHz at ≤ −27.0 dBm (20 mVrms).
4

Sweep the frequencies from 100 MHz to 1.5 GHz.
The Counter should read frequencies from 100 MHz to 1.5 GHz
at ≤ −27.0dBm (20 mVrms).

5

Record the actual reading in the Performance Test Record
(Test 4, Line 1).

100 MHz to 2.7 GHz Sensitivity for Option 030 Only
1

Set the HP 8663B Synthesized Signal Generator to output a
500 MHz, −60 dBm sine wave, and connect the signal to Channel 3
of the Counter as shown in Figure 1-14.

2

On the Counter, Press Run key.

3

Increase the power level in 1 dB steps until the Counter reads
500 MHz.
The Counter should display 500 MHz at ≤ −27.0 dBm (20 mVrms).

4

Sweep the frequencies from 100 MHz to 2.7 GHz.
The Counter should read frequencies from 100 MHz to 2.7 GHz
at ≤ −27.0 dBm (20 mVrms).

5

Record the actual reading in the Performance Test Record
(Test 4, Line 2).

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Assembly-Level Service Guide

Chapter 1 Performance Tests
Test 4: Option 015/030/050/124 Channel 2 Frequency Sensitivity

2.8 to 3.0 GHz Sensitivity for Option 030 Only
Disconnect the HP 8663A Synthesized Signal Generator from the
Counter (see Figure 1-14), and connect the HP 8340B Sweep
Oscillator to Channel 3 of the Counter.

2

Change the settings of the Sweep Oscillator to 3.0 GHz, −40 dBm.

3

Increase the power level in 1 dB steps until the Counter displays
3.0 GHz.
The Counter should display 3.0 GHz at ≤ −21.0 dBm.

4

Sweep the frequencies from 3.0 GHz to 2.8 GHz.
The Counter should read frequencies from 3.0 to 2.8 GHz at ≤ −21.0 dBm.

5

Record the actual reading in the Performance Test Record
(Test 4, Line 3).

6

Disconnect the test setup.

200 MHz to 5.0 GHz Sensitivity for Option 050 only
1

Connect the 8340B Sweep Oscillator to Channel 2 of the counter.

2

Change the settings of the Sweep Oscillator to 5.0 GHz, −30 dBm.

3

Increase the power level in 1 dB steps until the Counter displays a
stable reading of approximately 5.0 GHz.
The Counter should display 5.0 GHz at ≤ −23 dBm.
Use a power meter and sensor to ensure the accuracy of the power being
input.

NOTE

4

Sweep the frequencies from 200 MHz to 5.0 GHz.
The Counter should read frequencies from 200 MHz to 5.0 GHz at ≤ −23 dBm.

5

Record the actual reading in the Performance Test Record
(Test 4, Line 4).
Assembly-Level Service Guide

1-61

1

1

Chapter 1 Performance Tests
Test 4: Option 015/030/050/124 Channel 2 Frequency Sensitivity

1

200 MHz to 12.4 GHz Sensitivity for Option 124 only
1

Connect the 8340B Sweep Oscillator to Channel 2 of the counter.

2

Change the settings of the Sweep Oscillator to 12.4 GHz, −30 dBm.

3

Increase the power level in 1 dB steps until the Counter displays a
stable reading of approximately 12.4 GHz.
The Counter should display 12.4 GHz at ≤ −23 dBm.
Use a power meter and sensor to ensure the accuracy of the power being
input.

NOTE

4

Sweep the frequencies from 200 MHz to 12.4 GHz.
The Counter should read frequencies from 200 MHz to 12.4 GHz
at ≤ −23 dBm.

5

Record the actual reading in the Performance Test Record
(Test 4, Line 5).

6

Disconnect the test setup.

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Assembly-Level Service Guide

Chapter 1 Performance Tests
Test 5: Option 015/030/050/124 Channel 2 Frequency Accuracy (HP
53181A Only)

1

Test 5: Option 015/030/050/124 Channel 2
Frequency Accuracy (HP 53181A Only)
This test verifies the frequency accuracy of the optional 1.5-GHz
(Option 015), 3-GHz (Option 030), 5.0 GHz (Option 050), or 12.4 GHz
(Option 124) Channel 2 for the HP 53181A Frequency Counter.
The tests are organized as follows:
•

Option 015 Channel 2 Frequency Accuracy Test, starts on page 1-63

•

Option 030 Channel 2 Frequency Accuracy Test, starts on page 1-65

•

Option 050 Channel 2 Frequency Accuracy Test, starts on page 1-65

•

Option 124 Channel 2 Frequency Accuracy Test, starts on page 1-67

100 MHz to 1.5 GHz Accuracy Test for Option 015
Equipment
HP 8663A Synthesized Signal Generator
HP 8340B Sweep Oscillator
HP 1250-0780 Type N-to-BNC Connector
HP 10503A BNC Cable (2)
HP 10100C 50Ω Feedthrough
HP 11500D N-N Cable (Option 050 only)
HP 1250-1250 N(M) to SMA(F)
HP 1250-0777 N(F) to N(F)

Counter Setup
1

Cycle the POWER key to preset the Counter.

2

Set the Counter as follows:
MEASURE/Freq & Ratio, FREQUENCY 2
Gate & ExtArm, TIME: TIME 1.000 s

Assembly-Level Service Guide

1-63

Chapter 1 Performance Tests
Test 5: Option 015/030/050/124 Channel 2 Frequency Accuracy (HP
53181A Only)

Procedure
Connect equipment as shown in Figure 1-15.

1

1

Frequency Standard
(switch set to EXT)

HP 8340B
Sweep Oscillator

Output
Input
(rear panel)

HP 8663A
Synthesized Signal Generator
HP 53181A
Counter

50Ω
Feedthrough
Ref. In
(rear panel)

Output

Channel 2

N-to-BNC
Connector

Figure 1-15. Option 015/030/050/124 Channel 2 Frequency Accuracy Test Setup
2

Set the HP 8663A Synthesized Signal Generator to output
100 MHz at −17.0 dBm.
Verify the Counter reads 100 MHz ±70 mHz.

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Assembly-Level Service Guide

Chapter 1 Performance Tests
Test 5: Option 015/030/050/124 Channel 2 Frequency Accuracy (HP
53181A Only)

Record the actual reading in the Performance Test Record
(Test 5, Line 1).

4

Change the synthesized signal generator’s frequency to 1.5 GHz.
Verify the Counter reads 1.5 GHz ±1 Hz

5

Record the actual reading in the Performance Test (Test 5, Line 2).

6

Disconnect the test setup.

Minimum to Maximum Accuracy Test for Options
030/050/124
Equipment
HP 8663A Synthesized Signal Generator (not needed for Option 050)
HP 8340B Sweep Oscillator
HP 1250-0780 Type N-to-BNC Connector (not needed for Option 050)
HP 10503A BNC Cable (2)
HP 10100C 50Ω Feedthrough
HP 11500D N-N Cable (Option 050 only)
HP 1250-1250 N(M) to SMA(F)
HP 1250-0777 N(F) to N(F)

Counter Setup
1

Cycle the POWER key to preset the Counter.

2

Set the Counter as follows:
MEASURE/Freq & Ratio, FREQUENCY 2
Gate & ExtArm, TIME: TIME 1.000 s

Assembly-Level Service Guide

1-65

1

3

Chapter 1 Performance Tests
Test 5: Option 015/030/050/124 Channel 2 Frequency Accuracy (HP
53181A Only)

Procedure
1

Connect equipment as shown in Figure 1-15.

1

(NOTE: For Option 050/124, skip steps 2 through 7. Proceed to
step 8.)
2

Set the HP 8663A Synthesized Signal Generator to output
200 MHz at −17.0 dBm.

3

On the Counter, press Run key.
Verify the HP 53181A Counter reads 100 MHz ±70 mHz.

4

Record the actual reading in the Performance Test Record
(Test 5, Line 3).

5

Disconnect the HP 8663A output from Channel 2 of the Counter,
and connect the HP 8340B Sweep Oscillator output to Channel 2
of the Counter as shown in Figure 1-15.

6

Set the HP 8340B to output 3.0 GHz at −17.0 dBm.
Verify the HP 53181A Counter reads 3.0 GHz ±2 Hz.

7

Record the actual reading in the Performance Test Record.
(Test 5, Line 4).

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Assembly-Level Service Guide

Chapter 1 Performance Tests
Test 5: Option 015/030/050/124 Channel 2 Frequency Accuracy (HP
53181A Only)

(NOTE: For Options 050/124)
8

Set the HP 8340B to output 5.0 GHz at −17 dBm.

1

Verify the HP 53181A Counter reads 5.0 GHz ±3 Hz.
9

Record the actual reading in the Performance Test Record (Test 5,
Line 5).
(NOTE: For Option 124)

10

Set the HP 8340B to output 12.4 GHz at –17 dBm.
Verify the HP 53181A Counter reads 12.4 GHz ±8 Hz.

11

Record the actual reading in the Performance Test Record (Test 5,
Line 6).

12

Disconnect the test setup.

Assembly-Level Service Guide

1-67

Chapter 1 Performance Tests
Test 6: Peak Volts, Channel 1 (HP 53181A Only)

1

Test 6: Peak Volts, Channel 1 (HP 53181A
Only)
This test verifies the Peak Volts accuracy specification of the HP 53181A
Frequency Counter.

Equipment
HP 3325B Synthesizer
HP 10100C 50Ω Feedthrough
HP 10503A BNC Cable

Counter Setup
1

Cycle the POWER key to preset the Counter.

2

Press Other Meas key until VOLT PEAKS 1 is displayed.

3

Set CHANNEL 1 and CHANNEL 2 inputs to:
50Ω/1MΩ, 50Ω
X10 Attenuate, Off
100kHz Filter, Off

1-68

Assembly-Level Service Guide

Chapter 1 Performance Tests
Test 6: Peak Volts, Channel 1 (HP 53181A Only)

Procedure
1

Connect the equipment as shown in Figure 1-16.

1

HP 53181A
Counter

HP 3325B
Synthesizer

Channel 1

Output

Figure 1-16. Peak Volts Test Setup
2

Set the HP 3325B to output a 2 MHz, 2 Vp-p sine wave, and connect
the signal to Channel 1 of the Counter.
The Counter should display −1.00 ±0.12V for the negative peak of the
sine wave. This reading is displayed on the left side of the display.
Record the actual readings in the Performance Test Record
(Test 6, Line a).
Also, the Counter should display +1.00 ±0.12V for the positive peak of the
sine wave. This reading is displayed on the right side of the display.
Record the actual readings in the Performance Test Record
(Test 6, Line b).

3

Disconnect the test setup.

Assembly-Level Service Guide

1-69

Chapter 1 Performance Tests
HP 53181A HP-IB Verification Program (Optional)

1

HP 53181A HP-IB Verification Program
(Optional)
The HP-IB Verification program exercises the HP 53181A through various
operating modes via the its HP-IB interface. If the Counter successfully
completes all phases of the verification program, there is a high
probability that the HP-IB interface is operating correctly. If the Counter
fails the verification program, refer to the troubleshooting section in
Chapter 2, “Service,” of this guide.
The HP-IB Verification program may be loaded into the HP 9000
series 200 or 300 Desktop Computer from the 3 1/2-inch disk
(HP P/N 53181-13501) or the 5 1/4-inch disk (HP P/N 53181-13501).
1

To run the program on the disk, insert the disk into the Desktop
Computer, load the program by typing Load “VER81”, and press
RUN key on the computer’s keyboard.

2

Follow the instructions displayed in the computer’s screen.

3

After running this program, record the result (Pass or Fail) on the
last page (page 1-74) of the HP 53181A Performance Test Record.

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Assembly-Level Service Guide

Chapter 1 Performance Tests
HP 53181A Performance Test Record (Page 1 of 4)

1

HP 53181A Performance Test Record
(Page 1 of 4)
Hewlett-Packard Model 53181A Frequency Counter
Serial Number: _________________________ Repair/Work Order No. _ ________________
Test Performed By: _____________________ Temperature: __________________________
Date: __________________________________ Relative Humidity: _____________________
Notes: _________________________________________________________________________
Test Number

Operational Verification

Test Results
Pass
Fail

1

Power on Self Test

q

q

2

Channel 1, 10 MHz Test

q

q

3

Run Self Test

q

q

4a

Termination Check Ch 1, 50Ω

q

q

4b

Termination Check Ch 1, 1MΩ

q

q

5a

1 MHz External Timebase Input Test

q

q

5b

5 MHz External Timebase Input Test

q

q

5c

10 MHz External Timebase Input Test

q

q

Assembly-Level Service Guide

1-71

Chapter 1 Performance Tests
HP 53181A Performance Test Record (Page 2 of 4)

1

HP 53181A Performance Test Record
(Page 2 of 4)
Complete Performance Tests
Test
Number
1

Test Description

Minimum

Actual Reading

Maximum

Trigger Level:
Channel 1

−15 mV

1. __________

+15 mV

−15 mV

2. __________

+15 mV

Test 2: Channel 1 Frequency Sensitivity (HP 53181A Only)
Standard (Front Panel Terminals)

Actual Reading

Specification

100 kHz–100 MHz, Channel 1

1. __________

≤ −21 dBm (20 mVrms)

100 MHz–200 MHz, Channel 1

2. __________

≤ −17.5 dBm (30 mVrms)

200 MHz–225 MHz, Channel 1

3. __________

≤ −15.0 dBm (40 mVrms)

Option 060 Rear Terminals
100 kHz–225 MHz, Channel 1
Test
Number
3

Test Description

Actual Reading
1. __________
Minimum

Specification
≤ −9.5 dBm (75 mVrms)
Actual
Reading

Maximum

Channel 1
Frequency
Accuracy
(HP 53181A Only)
1 MHz Test

999,999.999 Hz

1. __________

1, 000, 000.001 Hz

100 MHz Test

99.999,999,93 MHz

2. __________

100.000, 000,07 MHz

200 MHz Test

199.999,999,87 MHz

3. __________

200.000,000,13 MHz

225 MHz Test

224.999,999,85 MHz

4. __________

225.000,000,15 MHz

1-72

Assembly-Level Service Guide

Chapter 1 Performance Tests
HP 53181A Performance Test Record (Page 3 of 4)

1

HP 53181A Performance Test Record
(Page 3 of 4)
Complete Performance Tests
Test 4: Option 015/030/050 Channel 2 Frequency Sensitivity (HP 53181A Only)
Actual Reading

Specification

100 MHz–1.5 GHz (Option 015 Only)

1. __________

≤ −27 dBm

100 MHz–2.7 GHz (Option 030 Only)

2. __________

≤ −27 dBm

2.8–3.0 GHz (Option 030 Only)

3. __________

≤ −21 dBm

.2–5.0 GHz (Option 050 Only)

4. __________

≤ −23 dBm

.2–12.4 GHz (Option 124 only)

5. __________

≤ −23 dBm

Test
Number
5

Minimum

Actual
Reading

Maximum

Channel 2

99.999,999,93 MHz

1. __________

100.000,000,07 MHz

Channel 2

1, 499.999,999 MHz

2. __________

1,500.000,001 MHz

Channel 2

99.999,999,93 MHz

3. __________

100.000,000,07 MHz

Channel 2

2,999.999,998 MHz

4. __________

3, 000.000,002 MHz

200 MHz to 5.0 GHz Test for
Option 050:

4,999.999,997 MHz

5. __________

5,000.000,003 MHz

200 MHz to 12.4 GHz Test
for Option 124:

12,399.999,992

6. __________

12.400.000,008 MHz

Test Description
Option 015/030 Channel 2
Frequency Accuracy
(HP 53181A Only)
100 MHz to 1.5 GHz Test for
Option 015 (HP 53181A):

5

5
5

100 MHz to 3.0 GHz Test for
Option 030 (HP 53181A):

Assembly-Level Service Guide

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Chapter 1 Performance Tests
HP 53181A Performance Test Record (Page 4 of 4)

1

HP 53181A Performance Test Record
(Page 4 of 4)
Complete Performance Tests
Test
Number
6

Test Description

Minimum

Actual
Reading

Maximum

Peak Volts,
Channel 1
(HP 53181A Only):
Channel 1

−1.12 V

a. __________

−0.88 V

+0.88 V

b. __________

+1.12V

HP-IB Verification (Optional)

Test Results
Pass
Fail
q

1-74

q

Assembly-Level Service Guide

2

Service

Chapter 2 Service
Introduction

Introduction
This chapter provides service information for your HP 53131A/132A/181A
and is divided into seven major sections:
Returning the Instrument to Hewlett-Packard for Service
(page 2-3). This section provides you with step-by-step instructions on
how to return the instrument for service.

•

About the HP 53131A/132A Calibration Menu (page 2-6).
This section contains reference information that gives a complete
overview of the calibration menu of the HP 53131A/132A.

•

The HP 53131A/132A Calibration Procedures (page 2-15).
This section provides step-by-step procedures for calibrating the
HP 53131A/132A.

•

About the HP 53181A Calibration Menu (page 2-25). This section
contains reference information that gives a complete overview of the
calibration menu of the HP 53181A.

•

The HP 53181A Calibration Procedures (page 2-31). This section
provides step-by-step procedures for calibrating the HP 53181A.

•

Pre-Troubleshooting Information (page 2-36). This section
provides you with pertinent information such as safety considerations,
recommended test equipment, repair and after-service considerations,
and assembly identification and location.

•

Troubleshooting the Counter (page 2-45). This section provides
you with troubleshooting procedures that isolate the faulty assembly
or module.

2

•

If the instrument is under warranty, return the instrument to
Hewlett-Packard for service. Refer to the first section of this chapter titled
“Returning the Instrument to Hewlett-Packard for Service.” If you decide
to troubleshoot the instrument yourself, refer to the section titled
“Troubleshooting the Counter.”

2-2

Assembly-Level Service Guide

Chapter 2 Service
Returning the Instrument to Hewlett-Packard for Service

Returning the Instrument to Hewlett-Packard
for Service
To Provide Repair Information
If you are shipping the instrument to an HP office for service or repair,
call your nearest Hewlett-Packard Sales Office to make arrangements.
Then tag and package the HP 53131A/132A/181A for shipment.

1

Write the following information on a tag:
•

Owner’s name and address

•

Instrument model number

•

Complete serial number

•

Description of service required or failure indications

2

Attach the tag to the instrument.

3

Pack the instrument.
If you have the original packaging materials, refer to the following section
titled “To Pack in the Original Packaging Materials.” If the original
packaging material are not available, you can order new materials
through an HP Sales Office. The new materials are identical to those used
by the factory when packaging the instrument. If you want to use
commercially available materials, refer to the section titled “To Pack in
the Commercially Available Materials.”

Assembly-Level Service Guide

2-3

2

Note there is an Express Repair/Performance Calibration Service for USA
customers if downtime is critical. You can receive your repaired Counter
via overnight shipment. Just call 800-403-0801 and ask for Express
Repair/Performance Calibration Service. When your Counter is repaired,
it will be returned via overnight shipment at no extra charge.

Chapter 2 Service
Returning the Instrument to Hewlett-Packard for Service

To Pack in the Original Packaging Materials

2

Whenever possible, repack the instrument in its original packaging for
shipment. In any correspondence, refer to the instrument by the model
number and complete serial number.
1

Disconnect the power cord, probes, cables, or other accessories
attached to the instrument.

2

Make sure the folded corrugated spacer (which normally contains
the manuals) is in the box to ensure proper fitting.

3

Make sure one of the polystyrene block is in its proper position in
the box.

4

Place the instrument, front panel end first, on the polystyrene
block.

5

Place the other polystyrene block on top of the rear end of the
instrument to secure it.

6

Do not return the manuals with the instrument. Return an
accessory only when it is a part of the failure symptoms.

7

Seal the shipping container securely.

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Assembly-Level Service Guide

Chapter 2 Service
Returning the Instrument to Hewlett-Packard for Service

To Pack in the Commercially Available Materials
If the factory packaging materials are not available, you can use
commercially available materials for shipping.
1

Wrap the instrument in heavy paper or plastic.

2

Place the instrument in a strong shipping container.
A double-wall carton made of 350-lb. test material is adequate.
Protect the control panel with cardboard.

4

Add a layer of shock-absorbing material.

2

3

The shock-absorbing material should be 70 to 100 mm (3 to 4 inches) thick
around all sides of the instrument to prevent movement inside the
container.
5

Seal the shipping container securely.

6

Mark the shipping container FRAGILE.

Assembly-Level Service Guide

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Chapter 2 Service
About the HP 53131A/132A Calibration Menu

About the HP 53131A/132A Calibration Menu
If you are familiar with the information provided in this section, proceed
to the section titled “The HP 53131A/132A Calibration Procedures” on
page 2-15 to calibrate your Counter. This section, “About the
HP 53131A/132A Calibration Menu,” can be used as a reference.

NOTE

With the exception of the standard timebase oscillator, no adjustments are
required for the HP 53131A/132A Counter.

2

NOTE

Overview of the HP 53131A/132A Calibration Menu
POWER

Scale &
Offset
On / Stby

The Calibration menu is accessed by holding the Scale & Offset key and
cycling the POWER key. All of the calibration factors and security
settings are stored in non-volatile memory, and do not change when power
has been off or after a remote interface reset.
A calibration security code feature allows you to enter a security code
(electronic key) to prevent accidental or unauthorized calibrations of the
Counter. The security code is set to 53131 or 53132 (corresponding to the
model) when the Counter is shipped from the factory. If you forget your
security code, you can reset the security code to the model-number default
by resetting all of the non-volatile memory to a default state (Contact HP
for this confidential procedure).

NOTE

This menu does not exist in early versions of the Counter. In the
early versions (firmware revisions 3317, 3335, and 3402) of the
HP 53131A/132A, the CAL: menu item resides in the Utility menu,
and there is no calibration security capability. See Chapter 6,
“Backdating,” in this guide for the correct calibration procedures.

2-6

Assembly-Level Service Guide

Chapter 2 Service
About the HP 53131A/132A Calibration Menu

The Calibration menu, illustrated on page 2-8, allows you to:
view the calibration security status of the Counter (CAL SECURE or
CAL UNSECURE)

•

initiate the Counter’s calibration routines, which can perform
automatic calibration of the voltage offset and gain of the front-end
input amplifiers (CAL: OFFS 1 / 2 ?, GAIN 1 / 2?), of the optional
timebase (CAL: TIMEBAS?), and of the differences in electrical
path-length between channels 1 and 2 (CAL: TI QUIK? and
CAL: TI FINE?)

•

secure against calibration by entering the security code while the
Counter is unsecured (CODE: )

•

unsecure for calibration by entering the security code while the
Counter is secured (CODE: )

•

change the security code by entering a new code while the Counter is
unsecured (CODE: )

•

view the calibration count, which indicates the number of times that
the Counter has been calibrated (CAL COUNT?). The calibration
count increments up to a maximum of 32,767 after which it wraps
around to 1. A calibration count of 0 indicates that the Counter is
completely uncalibrated. (The calibration count is unaffected by
interpolator calibration.)

•

get Help (HELP: ) with any of the following:
–

how to calibrate (CAL?),

–

how to secure (SECURE?), and

–

how to change the code (CODE?)

2

NOTE

•

A good precaution is to use an HP-IB program (see the programming
example titled “To Read and Store Calibration Data” in Chapter 3 of the
Programming Guide) to read and store the calibration factors prior to
initiating any calibration.

Assembly-Level Service Guide

2-7

Chapter 2 Service
About the HP 53131A/132A Calibration Menu

The HP 53131A/132A Calibration Menu Tree
NOTE

Turn power off, press and hold Scale & Offset key, then press POWER
key to access this menu. This menu does not exist in early versions
(firmware revisions 3317, 3335, and 3402) of the HP 53131A/132A.
In the early versions of the Counter, the CAL: menu item resides
in the Utility menu, and there is no calibration security
capability. See Chapter 6, “Backdating,” in this guide for correct
calibration procedures.

2

POWER

Scale &
Offset
On / Stby

CAL SECURE

CAL UNSECURE
1

CAL: OFFS1?
CAL: OFFS2?
CAL: GAIN1?
CAL: GAIN2?
CAL: TI QUIK?
CAL: TI FINE?

2

CAL: TIMEBAS?

CODE: 0
CAL COUNT?
HELP: CAL?
HELP: SECURE?
HELP: CODE?

1

This menu item appears and calibration is permitted only if calibration is unsecure. Enter in the correct code
to change calibration to secure.

2

Timebase can be automatically calibrated only if the timebase option is installed.

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Assembly-Level Service Guide

Chapter 2 Service
About the HP 53131A/132A Calibration Menu

To View the Calibration Menu and Security Status
The Calibration menu is accessed by holding the Scale & Offset key and
cycling the POWER key. The first item in the Calibration menu is a
message indicating the calibration security status: CAL SECURE or
CAL UNSECURE.

To Unsecure for Calibration
1

Press and hold Scale & Offset key, then cycle POWER key.

CAL SECURE is displayed.

2

Press Scale & Offset key until CODE: is displayed.

3

Press the appropriate arrow keys to enter the security code “53131”,
for example, if 53131 was the security code set at the factory.

4

Press Enter key.

CAL UNSECURE is displayed.
If “53131” was NOT the correct security code, the Counter would have
displayed BAD CODE.

NOTE

To Initiate the Calibration Routines
1

Press and hold Scale & Offset key, then cycle POWER key.

2

Unsecure for calibration by performing the preceding procedure.

3

Press Scale & Offset key until CAL: OFFS1? is displayed.

Assembly-Level Service Guide

2-9

2

If CAL UNSECURE is displayed, then the Counter is already unsecured
for calibration, and the remaining steps are not applicable.

Chapter 2 Service
About the HP 53131A/132A Calibration Menu

4

Press any one of the arrow keys until your calibration choice
(that is, CAL: OFFS2?, CAL: GAIN 1?, CAL: GAIN 2?, CAL: TI QUIK?,
CAL: TI FINE?, or CAL: TIMEBAS?) is displayed.
Note that the timebase choice (CAL: TIMEBAS?) only appears when the
Timebase Option is installed.

5

Press Enter key.

2

A scrolling message is displayed.
6

Follow the instructions in the scrolling message, and press Enter
key to start the calibration.
The Counter momentarily displays CALIBRATING, and then displays the
calibration test name and pass/fail status (for example, OFFS 1 PASS ).
When the calibration completes, a pass/fail message will be displayed.
If the calibration failed, then the calibration factors remain unchanged.
INFORMATION ABOUT CAL:TI QUIK? AND CAL:TI FINE?
CAL:TI QUIK? and CAL:TI FINE? are two different ways to calibrate out
the differences in electrical path length between Channel 1 and
Channel 2. When you provide the calibration signal, the instrument
measures how the difference in path length translates to an average delay
between the two channels.
The Quick Time Interval Calibration requires a simple input signal.
You provide on Channel 1 a clean square wave with a rapid rise time and
an approximate frequency of 10 MHz. The instrument routes the
calibration signal in COMMON to both channels 1 and 2, and measures
the average delay between the two channels so configured. The advantage
of the Quick Calibration is that it is easy, quick, and requires little special
equipment. The disadvantage is that the calibration term is best fit for
TI measurements configured COMMON and measured from rising to
rising edge; it leaves uncorrected a small systematic error for all other
configurations. The Fine Time Interval Calibration minimizes systematic
error by calibrating the instrument in each configuration.
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Assembly-Level Service Guide

Chapter 2 Service
About the HP 53131A/132A Calibration Menu

The Fine Time Interval Calibration requires a special calibrator signal
source to provide input—because it produces eight calibration terms, each
tailored to a different combination of input conditions. It requires the
synthesizer driving the calibrator to produce a very accurate 10 MHz
waveform—because it calibrates the pulse width configuration against the
50-nanosecond pulse width so provided. It minimizes systematic error by
calibrating the instrument in each of the eight configurations: falling to
falling edges, falling to rising edges, etc., and both SEPARATE and
COMMON routing.
Notes Pertaining to CAL: TI QUIK?

2

Advantage: Calibration signal is simple.
Disadvantage: One correction term for all slope and routing
configurations.
Input signal: clean square wave, fast rise time, approximately
10 MHz, 1 volt peak-to-peak, no dc offset (oscillating about 0.0 volts),
driving 50Ω.
Timebase: Any external timebase you provide is ignored during
calibration.
Procedure: From the front-panel calibration menu, one keypress
invokes the calibration.
Notes Pertaining to CAL: TI FINE?
Advantage: Calibration minimizes systematic error for any
supported combination of input slope and routing.
Disadvantage: Calibration signal is more complex. If you perform a
calibration that you feel is erroneous and do not feel you can perform
the fine calibration, perform the CAL: TI QUIK? calibration instead, or
restore the calibration factors that you saved prior to starting.
Equipment: HP 8130A Pulse Generator or equivalent.
HP 59992A J06 Time Interval Calibrator or equivalent.
Assembly-Level Service Guide

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Chapter 2 Service
About the HP 53131A/132A Calibration Menu

Equipment and Counter Setup: See Figure 2-1.

HP 8130A
Pulse Generator

In A

HP 53131A/132A
Counter

B

1

2

3

4

HP 59992A J06
Time Interval Calibrator

Start

Stop

2

Output

Figure 2-1. Calibration Setup for CAL: TI FINE?
Out of HP 8130A, into HP 59992A J06 Calibrator Signal:
PERIOD: 100 ns
WIDTH: 50 ns
High: 0.50 V
Low: −0.50 V
Input Mode: Normal
Timebase: Any external timebase you provide is ignored during
calibration.
Procedure: From the front-panel calibration menu, one keypress
invokes the calibration. You are prompted to press buttons on the
HP 59992A J06 Calibrator for each part of a four-part calibration.
Note that CAL: TI FINE? requires the completion of four steps in
order.

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Assembly-Level Service Guide

Chapter 2 Service
About the HP 53131A/132A Calibration Menu

To Secure Against Calibration
1

Press and hold Scale & Offset key, then cycle POWER key.

CAL UNSECURE is displayed. If CAL SECURE is displayed, then the
Counter is already secured against calibration and the remaining steps
are not applicable.
2

Press Scale & Offset key until CODE: is displayed.

3

Press the appropriate arrow keys to enter the security code, then
press Enter key.

2

CAL SECURE is displayed.

To Change to a New Security Code
1

Press and hold Scale & Offset key, then cycle POWER key.

2

Unsecure for calibration by the using the procedure described in
the section titled “To Unsecure for Calibration.”

3

Press Scale & Offset key until CODE: is displayed.

4

Press the appropriate arrow keys to enter the new or customized
security code, then press Enter key.
A scrolling message will appear, indicating what the new code is.
For example, the Counter displays the NEW CODE IS 5 if you entered “5”
as the new code.

Assembly-Level Service Guide

2-13

Chapter 2 Service
About the HP 53131A/132A Calibration Menu

To View the Calibration Count
1

Press and hold Scale & Offset key, then cycle POWER key.

2

Press Scale & Offset key until CAL COUNT? is displayed.

3

Press any one of the entry keys (arrow, +/-, Enter) to have a
scrolling message appear, indicating what the calibration count is.
Your Counter was calibrated before it left the factory. When you receive
your Counter, read the calibration count to determine its initial value.

2

To Get Help with the Calibration Menu
1

Press and hold Scale & Offset key, then cycle POWER key.

2

Press Scale & Offset key until HELP: CAL? is displayed.

3

Press any one of the arrow keys until your help choice (that is,
HELP: CAL?, HELP: SECURE?, HELP: CODE?) is displayed.

4

Press Enter key to display the help information.

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Assembly-Level Service Guide

Chapter 2 Service
The HP 53131A/132A Calibration Procedures

The HP 53131A/132A Calibration Procedures
First Determine the Counter Firmware Revision
Press and hold Recall (Utility) key, then cycle POWER key.

REV: n is displayed; where “n” represents the numeric firmware revision
code.

If the Counter’s firmware revision code is higher than the ones in the
previous paragraph, then perform the following procedures in this section.
After completing the instrument calibration, BE SURE to secure the
calibration by performing the procedure in the section titled “To Secure
Against Calibration” on page 2-13 of this chapter.

NOTE

To Calibrate the Offset for Channels 1 and 2
1

To access the Calibration menu, power down, and press and hold
the Scale & Offset key, then press POWER key.
The first item in the Calibration menu is a message indicating the
calibration security status: CAL SECURE or CAL UNSECURE.
The Counter calibration must be unsecured to perform calibration.
If CAL UNSECURE is displayed, the Counter is already unsecured for
calibration; go to step 5. However, if CAL SECURE is displayed then
perform steps 2 through 4 to unsecure calibration.

2

Press Scale & Offset key until CODE: 0 is displayed.

Assembly-Level Service Guide

2-15

2

If 3317, 3335, or 3402 is displayed as the firmware revision code, then
perform the calibration procedures in Chapter 6, “Backdating.”

Chapter 2 Service
The HP 53131A/132A Calibration Procedures

3

Press the appropriate arrow keys to enter the security code
“53131”, for example, if 53131 is the security code by performing
the following steps:
a. Press g key four times.
The Counter should display CODE: 00000.
b. Press d key five times.
The Counter should display CODE: 50000.

2

c. Press g key once, and then press d key three times.
The Counter should display CODE: 53000.
d. Press g key once, and then press d key once.
The Counter should display CODE: 53100.
e. Press g key once, and then press d key three times.
The Counter should display CODE: 53130.
f.

Press g key once, and then press d key once.
The Counter should display CODE: 53131.

g. Finally, press Enter key.

CAL UNSECURE is displayed.
If “53131” is NOT the correct security code, the Counter will display
BAD CODE.

NOTE

4

Press Scale & Offset key until CAL: OFFS 1 ? is displayed.

5

Press Enter key.
A scrolling message on the display will ask you to remove any signals
connected to Channel 1. Follow the instruction.

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Assembly-Level Service Guide

Chapter 2 Service
The HP 53131A/132A Calibration Procedures

6

Press Enter key.
The Counter momentarily displays CALIBRATING, and then it should
display OFFS 1 PASS.
If the fail message is displayed, refer to the troubleshooting section in this
chapter.
To calibrate Channel 2, press any one of the arrow keys until
CAL: OFFS 2 ? is displayed.

8

Press Enter key.

2

7

A scrolling message on the display will ask you to remove any signals
connected to Channel 2. Follow the instruction.
9

Press Enter key.
The Counter momentarily displays CALIBRATING, and then it should
display OFFS 2 PASS.
If the fail message is displayed, refer to the troubleshooting section in this
chapter.
This completes the Offset Calibration procedure. Proceed to the next
procedure to calibrate the gain.

Assembly-Level Service Guide

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Chapter 2 Service
The HP 53131A/132A Calibration Procedures

To Calibrate the Gain for Channels 1 and 2
1

Press any one of the arrow keys until CAL: GAIN 1 ? is displayed.

2

Press Enter key.
A scrolling message is displayed. Follow the instruction by performing the
following steps.
Connect a BNC tee connector to Channel 1 of the Counter.

4

Connect the Counter, dc power supply, and digital multimeter as
shown in Figure 2-2.

2

3

DC Power Supply
+

HP 53131A/132A
Counter

Digital Multimeter

- -

BNC Tee

Figure 2-2. Gain Calibration Setup
5

Adjust the power supply until the digital multimeter displays
+ 5.000 V ± 0.001 V.

6

Disconnect the digital multimeter from the Counter to prevent
noise from being introduced into the measurement.

7

Press Enter key.
The Counter momentarily displays CALIBRATING, and then it should
display GAIN 1 PASS.
If the fail message is displayed, refer to the troubleshooting section in this
chapter.
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Assembly-Level Service Guide

Chapter 2 Service
The HP 53131A/132A Calibration Procedures

8

To calibrate the gain for Channel 2, connect the input or the
BNC Tee to Channel 2 of the Counter.

9

Press any one of the arrow keys until CAL: GAIN 2 ? is displayed.

10

Press Enter key.
A scrolling message is displayed. (The +5V dc supply should already be
connected to Channel 2 as you were previously instructed to do this in
step 8.)
Press Enter key again.

2

11

The Counter momentarily displays CALIBRATING, and then it should
display GAIN 2 PASS.
If the fail message is displayed, refer to the troubleshooting section in this
chapter.
12

Disconnect the calibration setup.
This completes the Gain Calibration procedure. Proceed to the next
procedure to calibrate the time interval.

To Calibrate Time Interval
Refer to the section titled “INFORMATION ABOUT CAL:TI QUIK?
AND CAL:TI FINE?” (page 2-10 and page 2-11) for details on the
differences between the two time interval calibrations.

Assembly-Level Service Guide

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Chapter 2 Service
The HP 53131A/132A Calibration Procedures

CAL: TI QUIK? Calibration
1

Press any one of the arrow keys until CAL: TI QUIK? is displayed.

2

Press Enter key.
A scrolling message with instructions appears. Follow the instruction by
performing the following procedure

3

Connect the HP 8130A Pulse Generator output to Channel 1 of the
Counter as shown in Figure 2-3.

2

Equipment
HP 8130A Pulse Generator (or equivalent)
HP 10503A BNC Cable

HP53131A/132A
Counter

HP 8130A
Pulse Generator

Channel 1

Output

Figure 2-3. Calibration Setup for CAL: TI QUIK?
4

Set the HP 8130A as follows:
PERIOD: 100 ns
WIDTH: 50 ns
High: 0.50 V
Low : −0.50 V
Input Mode: Normal

NOTE

Any external timebase connected to the Counter is ignored during this
calibration.
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Assembly-Level Service Guide

Chapter 2 Service
The HP 53131A/132A Calibration Procedures

5

Press Enter key.
The Counter displays CALIBRATING, and then it should display
TI CAL PASS.
If the fail message is displayed, refer to the troubleshooting section in this
chapter.

6

Disconnect the calibration setup.
This completes the TI QUIK? calibration procedures.

2

Depending on which timebase the Counter contains, proceed to the
procedure “To Calibrate the Standard Timebase” (page 2-23) or the
“To Calibrate the High Stability Timebase Option (Medium, High, or
Ultra-High)” procedure (page 2-24) to calibrate the timebase.

CAL: TI FINE? Calibration
1

Connect the HP 8130A Pulse Generator, HP 59992A J06 Time
Interval Calibrator, and HP 53131A/123A Counter as shown in
Figure 2-4.

Equipment
HP 8130A Pulse Generator (or equivalent)
HP 59992A J06 Time Interval Calibrator (or equivalent)
HP 10503A BNC Cable (3)

HP 8130A
Pulse Generator

In A

HP 53131A/132A
Counter

B

1

Output

2

3

4

HP 59992A J06
Time Interval Calibrator

Start

Stop

Figure 2-4. Calibration Setup for CAL: TI FINE?
Assembly-Level Service Guide

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Chapter 2 Service
The HP 53131A/132A Calibration Procedures

2

Set the HP 8130A as follows:
PERIOD: 100 ns
WIDTH: 50 ns
High: 0.50 V
Low : −0.50 V
Input Mode: Normal
Any external timebase connected to the Counter is ignored during this
calibration.

NOTE

Press any one of the arrow keys until CAL: TI FINE? is displayed.

4

Press Enter key.

2

3

A scrolling message with instructions appears. Follow the instruction by
performing the following procedure.
Note the Counter display message prompts you to press buttons
on the HP 59992A J06 Calibrator for each part of a four-part
calibration.
Note that CAL: TI FINE? requires the completion of four steps in
the proper order.
5

Press Enter key after each displayed instruction.
The Counter should display CALIBRATING, and then it should display
TI CAL PASS.
If the fail message is displayed, refer to the troubleshooting section in this
chapter.
This completes the TI FINE? calibration procedures.
Depending on which timebase the Counter contains, proceed to the
following procedure “To Calibrate the Standard Timebase” or the
“To Calibrate the High Stability Timebase Option (Medium, High, or
Ultra-High)” procedure (page 2-24) to calibrate the timebase.
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Assembly-Level Service Guide

Chapter 2 Service
The HP 53131A/132A Calibration Procedures

To Calibrate the Standard Timebase
1

Connect the output of a 10 MHz house standard to Channel 1 of
the Counter as shown in Figure 2-5.

HP 53131A/132A
Counter

House Standard
10 MHz Reference

2

Channel 1

Figure 2-5. Standard Timebase Calibration Setup
2

Cycle the POWER key to preset the Counter.
Allow the counter to warm up for approximately 30 minutes.

3

With an insulated tuning tool, turn the OSC Adjust potentiometer
(located on the rear chassis of the Counter) until the frequency
reading in the Counter display is 10.00000000 MHz ± 5 Hz.
The Counter will be calibrated to the house standard.
If you are not able to adjust the frequency correctly, refer to the
troubleshooting section in this chapter.
This completes the Standard Timebase Calibration procedure.

Assembly-Level Service Guide

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Chapter 2 Service
The HP 53131A/132A Calibration Procedures

To Calibrate the High Stability Timebase Option
(Medium, High, or Ultra-High)
Allow the Counter to warm up for approximately 24 hours before
performing this calibration. This calibration is unlikely to fail, unless
the Counter is not warmed up.

NOTE

Connect the output of a 10 MHz house standard to Channel 1 of
the Counter as shown in Figure 2-5.

2

Press any one of the arrow keys until CAL: TIMEBAS? is displayed.

2

1

Note that the timebase choice (CAL: TIMEBAS?) only appears when the
Timebase Option is installed.
3

Press Enter key and follow the instructions in the scrolling
message that appears in the Counter display.

4

Press Enter key after each instruction.
The Counter displays CALIBRATING, and then it should display
TB CAL PASS.
If the fail message is displayed (even after the Counter has been warmed
up for 24 hours), refer to the troubleshooting section in this chapter.
This completes the High Stability Timebase Option Calibration procedure.
If all tests passed, the Counter is now calibrated.

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Chapter 2 Service
About the HP 53181A Calibration Menu

About the HP 53181A Calibration Menu
NOTE

If you are familiar with the information provided in this section, proceed
to the section titled “The HP 53181A Calibration Procedures” (page 2-31)
to calibrate your Counter. This section, “About the HP 53181A Calibration
Menu,” can be used as a reference.

NOTE

With the exception of the standard timebase oscillator, no adjustments are
required for the HP 53181A Counter.

2

Overview of the HP 53181A Calibration Menu
POWER

Scale &
Offset
On / Stby

The Calibration menu is accessed by holding the Scale & Offset key and
cycling the POWER key. All of the calibration factors and security
settings are stored in non-volatile memory, and do not change when power
has been off or after a remote interface reset.
A calibration security code feature allows you to enter a security code
(electronic key) to prevent accidental or unauthorized calibrations of the
Counter. The security code is set to 53181 when the Counter is shipped
from the factory. If you forget your security code, you can reset the
security code to the model-number default by resetting all of the
non-volatile memory to a default state.
The Calibration menu, illustrated on page 2-27, allows you to:
•

view the calibration security status of the Counter (CAL SECURE or
CAL UNSECURE)

•

initiate the Counter’s calibration routines, which can perform
automatic calibration of the voltage offset and gain of the front-end
input amplifiers (CAL: OFFS 1?, GAIN 1?), of the optional timebase
(CAL: TIMEBAS?)

•

secure against calibration by entering the security code while the
Counter is unsecured (CODE: )

Assembly-Level Service Guide

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Chapter 2 Service

2

About the HP 53181A Calibration Menu

NOTE

•

unsecure for calibration by entering the security code while the
Counter is secured (CODE: )

•

change the security code by entering a new code while the Counter is
unsecured (CODE: )

•

view the calibration count, which indicates the number of times that
the Counter has been calibrated (CAL COUNT?). The calibration
count increments up to a maximum of 32,767 after which it wraps
around to 1. A calibration count of 0 indicates that the Counter is
completely uncalibrated. (The calibration count is unaffected by
interpolator calibration.)

•

get Help (HELP:) with any of the following:
–

how to calibrate (CAL?),

–

how to secure (SECURE?), and

–

how to change the code (CODE?)

A good precaution is to use an HP-IB program (see the programming
example titled “To Read and Store Calibration Data” in Chapter 3 of the
Programming Guide) to read and store the calibration factors prior to
initiating any calibration.

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Chapter 2 Service
About the HP 53181A Calibration Menu

The HP 53181A Calibration Menu Tree
NOTE

Turn power off, press and hold Scale & Offset key, then press POWER
key to access this menu.

POWER

Scale &
Offset
On / Stby

CAL SECURE

CAL UNSECURE

2

3

CAL: OFFS1?
CAL: GAIN1?

4

CAL: TIMEBAS?

CODE: 0
CAL COUNT?
HELP: CAL?
HELP: SECURE?
HELP: CODE?

3

This menu item appears and calibration is permitted only if calibration is unsecured. Enter in the correct code
to change calibration to secure.

4

Timebase can be automatically calibrated only if the timebase option is installed.

Assembly-Level Service Guide

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Chapter 2 Service
About the HP 53181A Calibration Menu

To View the Calibration Menu and Security Status
The Calibration menu is accessed by holding the Scale & Offset key and
cycling the POWER key. The first item in the Calibration menu is a
message indicating the calibration security status: CAL SECURE or
CAL UNSECURE.

To Unsecure for Calibration
1

Press and hold Scale & Offset key, then cycle POWER key.

2

CAL SECURE is displayed.
If CAL UNSECURE is displayed, then the Counter is already unsecured
for calibration, and the remaining steps are not applicable.
2

Press Scale & Offset key until CODE: is displayed.

3

Press the appropriate arrow keys to enter the security code “53181”,
for example, if 53181 was the security code set at the factory.

4

Press Enter key.

CAL UNSECURE is displayed.
NOTE

If “53181” was NOT the correct security code, the Counter would have
displayed BAD CODE.

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Chapter 2 Service
About the HP 53181A Calibration Menu

To Initiate the Calibration Routines
1

Press and hold Scale & Offset key, then cycle POWER key.

2

Unsecure for calibration by performing the preceding procedure.

3

Press Scale & Offset key until CAL: OFFS1? is displayed.

4

Press any one of the arrow keys until your calibration choice
(that is, CAL: GAIN 1?, or CAL: TIMEBAS?) is displayed.

5

Press Enter key.
A scrolling message is displayed.

6

Follow the instructions in the scrolling message, and press Enter
key to start the calibration.
The Counter momentarily displays CALIBRATING, and then displays the
calibration test name and pass/fail status (for example, OFFS 1 PASS ).
When the calibration completes, a pass/fail message will be displayed.
If the calibration failed, then the calibration factors remain unchanged.

To Secure Against Calibration
1

Press and hold Scale & Offset key, then cycle POWER key.

CAL UNSECURE is displayed. If CAL SECURE is displayed, then the
Counter is already secured against calibration and the remaining steps
are not applicable.
2

Press Scale & Offset key until CODE: is displayed.

3

Press the appropriate arrow keys to enter the security code, then
press Enter key.

CAL SECURE is displayed.
Assembly-Level Service Guide

2-29

2

Note that the timebase choice (CAL: TIMEBAS?) only appears when the
Timebase Option is installed.

Chapter 2 Service
About the HP 53181A Calibration Menu

To Change to New the Security Code
1

Press and hold Scale & Offset key, then cycle POWER key.

2

Unsecure for calibration by the using the procedure described in
the section titled “To Unsecure for Calibration.”

3

Press Scale & Offset key until CODE: is displayed.

4

Press the appropriate arrow keys to enter the new or customized
security code, then press Enter key.

2

A scrolling message will appear, indicating what the new code is.
For example, the Counter displays the NEW CODE IS 5 if you entered “5”
as the new code.

To View the Calibration Count
1

Press and hold Scale & Offset key, then cycle POWER key.

2

Press Scale & Offset key until CAL COUNT? is displayed.

3

Press any one of the entry keys (arrow, +/-, Enter) to have a
scrolling message appear, indicating what the calibration count
is.
Your Counter was calibrated before it left the factory. When you receive
your Counter, read the calibration count to determine its initial value.

To Get Help with the Calibration Menu
1

Press and hold Scale & Offset key, then cycle POWER key.

2

Press Scale & Offset key until HELP: CAL? is displayed.

3

Press any one of the arrow keys until your help choice (that is,
HELP: CAL?, HELP: SECURE?, HELP: CODE?) is displayed.

4

Press Enter key to display the help information.

2-30

Assembly-Level Service Guide

Chapter 2 Service
The HP 53181A Calibration Procedures

The HP 53181A Calibration Procedures
First Determine the Counter Firmware Revision
Press and hold Recall (Utility) key, then cycle POWER key.

REV: n is displayed; where “n” represents the numeric firmware revision
code.

To Calibrate the Offset for Channel 1
1

To access the Calibration menu, power down, and press and hold
the Scale & Offset key, then press POWER key.
The first item in the Calibration menu is a message indicating the
calibration security status: CAL SECURE or CAL UNSECURE.
The Counter calibration must be unsecured to perform calibration.
If CAL UNSECURE is displayed, the Counter is already unsecured for
calibration; go to step 5. However, if CAL SECURE is displayed then
perform steps 2 through 4 to unsecure calibration.

2

Press Scale & Offset key until CODE: 0 is displayed.

3

Press the appropriate arrow keys to enter the security code
“53181”, for example, if 53181 is the security code by performing
the following steps:
a. Press

key four times.

The Counter should display CODE: 00000.
b. Press

key five times.

The Counter should display CODE: 50000.
Assembly-Level Service Guide

2-31

2

After completing the instrument calibration, BE SURE to secure the
calibration by performing the procedure in the section titled “To Secure
Against Calibration” on page 2-29 of this chapter.

NOTE

Chapter 2 Service
The HP 53181A Calibration Procedures

c. Press

key once, and then press

key three times.

The Counter should display CODE: 53000.
d. Press

key once, and then press

key once.

The Counter should display CODE: 53100.
e. Press

key once, and then press

key eight times.

The Counter should display CODE: 53180.

2

f.

Press

key once, and then press

key once.

The Counter should display CODE: 53181.
g. Finally, press Enter key.

CAL UNSECURE is displayed.
If “53181” is NOT the correct security code, the Counter will display
BAD CODE.

NOTE

4

Press Scale & Offset key until CAL: OFFS 1 ? is displayed.

5

Press Enter key.
A scrolling message on the display will ask you to remove any signals
connected to Channel 1. Follow the instruction.

6

Press Enter key.
The Counter momentarily displays CALIBRATING, and then it should
display OFFS 1 PASS.
If the fail message is displayed, refer to the troubleshooting section in this
chapter.
This completes the Offset Calibration procedure. Proceed to the next
procedure to calibrate the gain.

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Assembly-Level Service Guide

Chapter 2 Service
The HP 53181A Calibration Procedures

To Calibrate the Gain for Channel 1
1

Press any one of the arrow keys until CAL: GAIN 1 ? is displayed.

2

Press Enter key.
A scrolling message is displayed. Follow the instruction by performing the
following steps.
Connect a BNC tee connector to Channel 1 of the HP 53181A.

4

Connect the Counter, dc power supply, and digital multimeter
shown in Figure 2-6.

DC Power Supply
+

HP 53181A
Counter

Digital Multimeter

- -

BNC Tee

Figure 2-6. Gain Calibration Setup
5

Adjust the power supply until the digital multimeter
+ 5.000 V ± 0.001 V.

6

Disconnect the digital multimeter from the Counter to prevent
noise from being introduced into the measurement.

7

Press Enter key.
The Counter momentarily displays CALIBRATING, and then it should
display GAIN 1 PASS.
If the fail message is displayed, refer to the troubleshooting section in this
chapter.
Assembly-Level Service Guide

2-33

2

3

Chapter 2 Service
The HP 53181A Calibration Procedures

8

Disconnect the calibration setup.
This completes the Gain Calibration procedure.
Depending on which timebase the Counter contains, proceed to either the
following procedure “To Calibrate the Standard Timebase” or the
“To Calibrate the High Stability Timebase Option (Medium, High, or
Ultra-High)”procedure (page 2-35) to calibrate the timebase.

To Calibrate the Standard Timebase
2

1

Connect the output of a 10 MHz house standard to Channel 1 of
the Counter as shown in Figure 2-7.

HP 53181A
Counter

House Standard
10 MHz Reference

Channel 1

Figure 2-7. Standard Timebase Calibration Setup
2

Cycle the POWER key to preset the Counter.
Allow the counter to warm up for approximately 30 minutes.

3

With an insulated tuning tool, turn the OSC Adjust potentiometer
(located on the rear chassis of the Counter) until the frequency
reading in the Counter display is 10.00000000 MHz ± 5 Hz.
The Counter will be calibrated to the house standard.
If you are not able to adjust the frequency correctly, refer to the
troubleshooting section in this chapter.
This completes the Standard Timebase Calibration procedure.
2-34

Assembly-Level Service Guide

Chapter 2 Service
The HP 53181A Calibration Procedures

To Calibrate the High Stability Timebase Option
(Medium, High, or Ultra-High)
Allow the Counter to warm up for approximately 24 hours before
performing this calibration. This calibration is unlikely to fail, unless
the Counter is not warmed up.

NOTE

1

Connect the output of a 10 MHz house standard to Channel 1 of
the Counter as shown in Figure 2-7.

2

Press any one of the arrow keys until CAL: TIMEBAS? is displayed.

2

Note that the timebase choice (CAL: TIMEBAS?) only appears when the
Timebase Option is installed.
3

Press Enter key and follow the instructions in the scrolling
message that appears in the Counter display.

4

Press Enter key after each instruction.
The Counter displays CALIBRATING, and then it should display
TB CAL PASS.
If the fail message is displayed (even after the Counter has been warmed
up for 24 hours), refer to the troubleshooting section in this chapter.
This completes the High Stability Timebase Option Calibration procedure.
If all tests passed, the Counter is now calibrated.

NOTE

If the counter has been disconnected from line power for over 24 hours, it
may take up to 30 days for the daily aging rate to be re-attained.

Assembly-Level Service Guide

2-35

Chapter 2 Service
Pre-Troubleshooting Information

Pre-Troubleshooting Information

2

This section contains the following pertinent troubleshooting information:
•

Safety Considerations

•

Recommended Test Equipment

•

Repair Considerations

•

After Service Considerations

•

Assembly Identification and Location

Safety Considerations
Although this instrument has been designed in accordance with
international safety standards, this guide contains information, cautions,
and warnings which must be followed to ensure safe operation and to
retain the instrument in a safe condition. Service instructions, and
adjustment procedures requiring removal of the instrument cover, are for
use by service-trained personnel only. To avoid dangerous electric shock,
do not perform any servicing or make any adjustments with the cover
removed, unless qualified to do so.

2-36

Assembly-Level Service Guide

Chapter 2 Service
Pre-Troubleshooting Information

WARNING

BEFORE APPLYING AC POWER, THE INSTRUMENT AND ALL
PROTECTIVE EARTH TERMINALS, EXTENSION CORDS, AUTO
TRANSFORMERS, AND DEVICES CONNECTED TO THE
INSTRUMENT SHOULD BE CONNECTED TO A PROTECTIVE
EARTH GROUNDED SOCKET.

Any maintenance and repair of the opened instrument under voltage
should be avoided as much as possible and, if necessary, should be
carried out only by a skilled person who is aware of the hazards involved
(for example, fire and electric shock).

Recommended Test Equipment
Test equipment recommended for testing and troubleshooting the
HP 53131A/132A/181A is listed in Chapter 1, “Performance Tests.”
Substitute equipment may be used if it meets or exceeds the required
characteristics listed in Table 1-1.

Assembly-Level Service Guide

2-37

2

ANY INTERRUPTION OF THE PROTECTIVE GROUNDING
CONDUCTOR INSIDE OR OUTSIDE THE INSTRUMENT OR
DISCONNECTION OF THE PROTECTIVE EARTH TERMINAL
WILL CAUSE A POTENTIAL SHOCK HAZARD THAT COULD
RESULT IN PERSONAL INJURY. INTENTIONAL
INTERRUPTION IS PROHIBITED.

Chapter 2 Service
Pre-Troubleshooting Information

Repair Considerations
Electrostatic Discharge

2

Electronic components and assemblies in the HP 53131A/132A/181A can
be permanently degraded or damaged by electrostatic discharge. Use the
following precautions when servicing the instrument:
1

ENSURE that static-sensitive devices or assemblies are serviced
at static-safe work stations providing proper grounding for
service personnel.

2

ENSURE that static-sensitive devices or assemblies are stored in
static shielding bags or containers.

3

DO NOT wear clothing subject to static-charge buildup, such as
wool or synthetic materials.

4

DO NOT handle components or assemblies in carpeted areas.

5

DO NOT remove an assembly or component from its static
shielding protection until you are ready to install it.

6

AVOID touching component leads. (Handle by packaging only.)

Surface Mount Repair
Surface mount components should only be removed using soldering irons
or desoldering stations expressly designed for surface mount components.
Use of conventional solder removal equipment will almost always result in
permanent damage to the printed circuit board and will void your
Hewlett-Packard factory warranty.

Disassembly and Reassembly Specifics
Refer to the Chapter 3, “Replacing Assemblies,” in this guide for complete
disassembly and reassemble details, and Chapter 5, “Replaceable Parts,”
for the appropriate exploded view of the instrument parts.

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Assembly-Level Service Guide

Chapter 2 Service
Pre-Troubleshooting Information

After Service Considerations
Product Safety Checks
The following safety checks must be performed after any troubleshooting
and repair procedures have been completed to ensure the safe operation of
the instrument.

1

VISUAL INSPECTION. Visually inspect the interior of the instrument for
any signs of abnormal internally generated heat, such as discolored
printed circuit boards or components, damaged insulation, or evidence of
arcing. Determine and remedy the cause of any such condition.

2

GROUND CONTINUITY TEST. Plug the power cord into the rear-panel
power receptacle. (DO NOT connect the instrument to ac power at this
time.) Using a suitable ohmmeter, check resistance from the instrument’s
metallic connection (such as the rear panel or BNC ground collar) to the
ground pin on the power cord plug. The reading must be less that 1Ω.
Flex the power cord while making this measurement to determine
whether intermittent discontinuities exist.

3

Check any indicated front- or rear-panel ground terminals marked, using
the above procedure.

4

INSULATION RESISTANCE TEST. Tie the line and neutral pins of the
power cord plug together. Measure the resistance from the instrument
enclosure (chassis) to the line and neutral pins of the power cord plug.
The minimum acceptable resistance is 2 MΩ. Replace any component
which results in a failure.

Product Performance Checks
After replacement of any assembly or module, perform the operational
verification test in Chapter 1, “Performance Tests,” of this guide.
Assembly-Level Service Guide

2-39

2

RESISTANCE CHECKS DESCRIBED IN THE FOLLOWING TEXT
REQUIRE THAT THE POWER CORD BE CONNECTED TO THE
INSTRUMENT AND THAT AC POWER BE DISCONNECTED.
BE SURE THAT THE POWER CORD IS NOT CONNECTED TO
POWER BEFORE PERFORMING ANY SAFETY CHECKS.

WARNING

Chapter 2 Service
Pre-Troubleshooting Information

Assembly Identification and Location
The assembly number, name and Hewlett-Packard part number of the
HP 53131A , HP 53132A, and HP 53181A assemblies are listed in
Table 2-1, Table 2-2, and Table 2-3, respectively. Figure 2-8A,
Figure 2-8B, and 5-1 illustrate the replaceable assemblies and cables in
the HP 53131A/132A/181A.

2

Table 2-1. HP 53131A Assembly Identification
Assembly Name

HP Part No.

Exchange Part No.*

A1 Motherboard (Series
Prefix 3705 and above)

53131-60004**

53131-69004**

A2 Display Board

53131-60002

no exchange

Option 030, 1.5 GHz

n/a

53132-60003

Option 050, 3 GHz

n/a

53132-69211

Option 124, 12.4 GHz

n/a

53132-69212

Standard

0950-2496

no exchange

Option 002

53132-60207

no exchange

Option 010 and 012

53132-60208

no exchange

53132-60206

no exchange

(Option 001)

53132-60004 or 53132-60008—Support Bd
1813-0931—Oscillator

no exchange
no exchange

(Option 010)

53132-60016—Support Board
10811-60160—Oscillator

no exchange
10811-69160

(Option 012)

53132-60016—Support Board
10811-60260—Oscillator

no exchange
10811-69260

A3 Channel 3 Input Board

A4 AC Power Supply

A5 DC Power Supply
Option 002
A6 Oven Timebase

* Exchange part availability subject to change without notice. Contact your local Hewlett-Packard Sales Office for current information.
** If the Motherboard needs to be replaced in a unit which contains Options 030, 050, or 124, it must be done at an HP Service Center.

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Assembly-Level Service Guide

Chapter 2 Service
Pre-Troubleshooting Information

Table 2-2. HP 53132A Assembly Identification
Assembly Name

HP Part No.

Exchange Part No.*

A1 Motherboard (Series
Prefix 3705 and above)

53132-60014**

53131-69014**

A2 Display Board

53131-60002

no exchange

Option 030

n/a

53132-60003

Option 050

n/a

53132-69211

Option 124

n/a

53132-69212

Standard

0950-2496

no exchange

Option 002

53132-60207

no exchange

Option 010 and 012

53132-60208

no exchange

53132-60206

no exchange

(Option 001)

53132-60008—Support Board
1813-0931—Oscillator

no exchange
no exchange

(Option 010)

53132-60016—Support Board
10811-60160—Oscillator

no exchange
10811-69160

(Option 012)

53132-60016—Support Board
10811-60260—Oscillator

no exchange
10811-69260

A3 Channel 3 Input Board

2

A4 AC Power Supply

A5 DC Power Supply
Option 002
A6 Oven Timebase

* Exchange part availability subject to change without notice. Contact your local Hewlett-Packard Sales Office for current information.
** If the Motherboard needs to be replaced in a unit which contains Options 030, 050, or 124, it must be done at an HP Service Center.

Assembly-Level Service Guide

2-41

Chapter 2 Service
Pre-Troubleshooting Information

Table 2-3. HP 53181A Assembly Identification
Assembly Name

HP Part No.

Exchange Part
No.*

A1 Motherboard (Series
Prefix 3705 and above)

53181-60004**

53181-69004**

A2 Display Board

53131-60002

no exchange

Option 015/030

n/a

53132-60003

Option 050

n/a

53132-69211

Option 124

n/a

53132-69212

Standard

0950-2496

no exchange

Option 002

53132-60207

no exchange

Option 010 and 012

53132-60208

no exchange

53132-60206

no exchange

(Option 001)

53132-60004 or 53132-60008—Support Board
1813-0931—Oscillator

no exchange
no exchange

(Option 010)

53132-60016—Support Board
10811-60160—Oscillator

no exchange
10811-69160

(Option 012)

53132-60016—Support Board
10811-60260—Oscillator

no exchange
10811-69260

2

A3 Channel 2 Input Board

A4 AC Power Supply

A5 DC Power Supply
Option 002
A6 Oven Timebase

* Exchange part availability subject to change without notice. Contact your local Hewlett-Packard Sales Office for current information.
** If the Motherboard needs to be replaced in a unit which contains Options 030, 050, or 124, it must be done at an HP Service Center.

2-42

Assembly-Level Service Guide

Chapter 2 Service
Pre-Troubleshooting Information

RS-232
Connector

HP-IB Connector

10 MHz Out Connector
Ref In Connector
Ext Arm Connector

J18 Power Supply
Assembly Connector

2

J6
A4 AC Power Supply
Assembly

A3 Option 030/050
Channel 3 Assembly for
HP 53131A/132A
OR
A3 Option 015/030/050
Channel 2 Assembly for
HP 53181A
J9
A1 Motherboard
Assembly
J7

A6 High Stability
Timebase Assembly

A3 Option 015/030/050 Channel
Input Board Assembly
Cable (P/O optional channel
input board, Option 015/030 only)
A3 Option 015/030 Channel
Input Board Assembly
Coaxial Cable
(W1)

A2 Display Board
Assembly
(Hidden)
Front Bezel
(MP4)

A2 Display Board
Assembly Cable
(P/O Display
Board Assembly)

Input BNC Connectors
(P/O A1 Motherboard Assembly)

Figure 2-8A. Instrument Top Internal View
Assembly-Level Service Guide

2-43

Chapter 2 Service
Pre-Troubleshooting Information

RS-232
Connector

HP-IB Connector

10 MHz Out Connector
Ref In Connector
Ext Arm Connector
XLR (Male)
Jack (P/O A5)

J18 Power Supply
Assembly Connector

2

A5 DC Power Input
Assembly

J6 (Hidden)
A4 AC Power Supply
Assembly

A3 Option 030
Channel 3 Assembly for
HP 53131A/132A
OR
A3 Option 015/030
Channel 2 Assembly for
HP 53181A
J9
A1 Motherboard
Assembly
J7

A6 High Stability
Timebase Assembly

A3 Option 015/030/050 Channel
Input Board Assembly
Cable (P/O optional channel
input board, Option 015/030 only)
A3 Option 015/030 Channel
Input Board Assembly
Coaxial Cable
(W1)

A2 Display Board
Assembly
(Hidden)
Front Bezel
(MP4)

A2 Display Board
Assembly Cable
(P/O Display
Board Assembly)

Input BNC Connectors
(P/O A1 Motherboard Assembly)

Figure 2-8B. Instrument Top Internal View (Option 002)
2-44

Assembly-Level Service Guide

Chapter 2 Service
Troubleshooting the Counter

Troubleshooting the Counter
Power Supply Check
HAZARDOUS VOLTAGES ARE ON THE POWER SUPPLY
ASSEMBLY. ONLY SERVICE TRAINED AND QUALIFIED
PERSONNEL SHOULD PERFORM THE FOLLOWING
PROCEDURE.

WARNING

Remove the power cord from the back of the instrument to
disconnect the Counter from the power source.

2

Remove the cover as described in Chapter 3.

2

1

A4 AC Power Supply Assembly is fused for safety reasons. It is assumed
that if the fuses are blown, then damage has occurred to the power supply
which will make it unreliable. Do not attempt to repair the power supply.

NOTE

3

Connect the Counter to the power source.
The fan should begin to operate as soon as power is supplied. If the fan
does not operate, replace A4 AC Power Supply Assembly.
Refer to Chapter 3, “Replacing Assemblies,” in this service guide if you
need to remove or replace an assembly.
After replacing the power supply assembly, perform the appropriate
calibration procedures in this chapter.

4

CAUTION

Connect the negative lead of a voltmeter to the chassis and verify
that the voltages in Table 2-4 match the voltages measured on
connector J18 of A1 Motherboard Assembly. See Figure 2-9 for
illustration of J18 viewing from the bottom of the Counter.
BE CAREFUL to NOT short the positive-side lead of the voltmeter to the
chassis when probing at the testpoints shown in Figure 2-9.
Assembly-Level Service Guide

2-45

Chapter 2 Service
Troubleshooting the Counter

2

Ref
In
!

2

+5

RS - 232

GND

-9V
9G
-12
GND
+12

J18

92

010 HS Oven

FOR LABORATORY USE BY
QUALIFIED PERSONNEL
FOUR USAGE EN LABORATOIRE
PAR PERSONNEL QUALIFIE

ISM 1-A

HP-IB

OPTIONS

001 MS Oven

Talk Only

Osc Adjust

To Configure:
Hold Recall during turn-on.

A1
Motherboard
Assembly

AC LINE:

10 MHz Out

C
VA
VA 20 AC
600 - 140 V
100 - 2
20

z
0H
/40 Hz
/60 /60
50 50

TE

LA

P
IAL

R

SE

Figure 2-9. A4 AC Power Suppy Testpoint Locations on A1 Motherboard
Assembly (Bottom View)

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Assembly-Level Service Guide

Chapter 2 Service
Troubleshooting the Counter

Table 2-4 lists A4 power supply voltages, the corresponding wire color,
and the tolerances.
Table 2-4. A4 AC Power Supply Voltages
Voltage

Tolerance

Red

+5.0 V

±0.250 V

Red

+5.0 V

±0.250 V

Black

0.0 V

______

Black

0.0 V

______

Yellow

+12.0 V

±0.6 V

Black

0.0 V

______

Blue

-12.0 V

±1.2 V

2

5

Wire Color

After verifying the correct voltage and that all calibrations
passed, proceed to the following section.

Overview of the Self-Test Routines
The Utility menu includes the following three self-test menu items:
•

TEST LOOP:

•

TST PRINT:

•

TEST:

The Counter includes several self-tests. Some self tests are performed at
the power-up of the Counter. Some of these self tests can also be invoked
from the Utility menu. Other tests can also be invoked from the Utility
menu, but a slightly different test is performed. For example, a power-up
self test might work regardless of connections to the inputs while a Utility
menu self test may require a specific signal to be connected. Some self tests
can only be invoked from the Utility menu, for example, the keypad test.
You can specify that the tests should loop forever (TEST LOOP: ON or
OFF) or until any key is pressed.

Assembly-Level Service Guide

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Chapter 2 Service
Troubleshooting the Counter

You can also specify that failure messages be sent to a printer, the RS-232,
and the HP-IB—if in talk-only (TST PRINT: ON or OFF).
There are 13 choices for the TEST: menu item. They are listed and
described in the following text.

TEST:

ALL? —run all tests, except display, keypad and printer
tests.

2

DISP? —illuminate the indicators and vacuum-fluorescent
display (VFD) segments. Note, this test is not
available if TEST LOOP: is ON. TEST LOOP: must
be OFF.
CPU? —test processor(s).
ROM? —checksum the ROM.
RAM? —test RAM.
EEPROM? —checksum the EEPROM, which is used for
non-volatile memory.
HP-IB? —test HP-IB chip.
QSPI? —test serial hardware control loops.
FPGA? —internally measure the timebase to test count
circuitry.
FR END? —check front end circuits, either by swinging trigger
levels (during power on test and ALL test) or
asking you to connect the timebase output to
channels 1 and 2 using a BNC-T connector to split
the signal.
MEAS? —make a measurement, either by swinging trigger
levels (during power on test and ALL test) or
asking you to connect the timebase output to
channel 1.
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Assembly-Level Service Guide

Chapter 2 Service
Troubleshooting the Counter

INTERP? —test interpolators.
KEYPAD? —request user to press all keys. Note, this test is not
available if TEST LOOP: is ON. TEST LOOP: must
be OFF.
PRINT? —send three test lines to a printer via the RS-232.
If in talk-only, also send three test lines to a printer
via the HP-IB.

Diagnosing the Faulty Assembly by Using the
Self Tests
To Run the Test-All Self Test
1

Press and hold Recall (Utility) key, then cycle POWER key.

2

Press Recall (Utility) key until TEST: ALL? is displayed.

3

Press Enter key to start the test.
The counter will display the tests as they are being performed. When the
tests are completed the display should show ALL: PASS.
If the fail message is displayed, run the appropriate individual test as
described in the following sub-section. If the individual test fail, use
Table 2-5 to determine which board or assembly you should replace.

Assembly-Level Service Guide

2-49

2

When running the TEST LOOP self-test routine, be sure to connect the
Counter to a serial printer via the RS-232 using a RS-232 printer interface
cable (HP 24542G or HP 24542H) to receive more specific failure
information. If you run the TEST LOOP test without Counter being
connected to a printer, the Counter will only display pass or fail message.

NOTE

Chapter 2 Service
Troubleshooting the Counter

To Run the Individual Self Tests
1

Press and hold Recall (Utility) key, then cycle POWER key.
If power does not cycle or the display does not light, go to the section titled
“Power Supply Check” on page 2-45 of this chapter.

NOTE

2

Press Recall (Utility) key until TEST LOOP: is displayed.

3

Ensure that TEST LOOP:OFF is displayed.

2

Note that the DISP? and KEYPAD? tests are not available if
TEST LOOP: is ON.
If TEST LOOP: ON is displayed, press any one of the arrow keys to set
TEST LOOP to OFF.
4

Press Recall (Utility) key until TEST: ALL? is displayed.

5

Press any one of the arrow keys to select the desired self test
(for example, the DISP? self test).

6

Press Enter key to start the test.
After a test is completed, a pass or fail message will be displayed.
After the DISP? (Display) test has cycled through each display segment
and annunciator, press the Enter key to stop the test and to display the
pass or fail message.

NOTE

7

If you are asked to do something, press Enter key when you have
completed the requested task.
After a test is completed, a pass or fail message will be displayed.

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Assembly-Level Service Guide

Chapter 2 Service
Troubleshooting the Counter

8

Repeat steps 2 through 5 for each of the self tests.
Note that for the TEST: FR END? test, connect Counter as shown in
Figure 2-11A or Figure 2-11B (depending on which Counter you are
testing) and press Enter key.

HP 53131A/132A
Counter

10 MHz
Out
(rear panel)

Channel 1

2

Channel 2

BNC Tee

Figure 2-11A. HP 53131A/132A Self Test Troubleshooting Setup

HP 53181A
Counter

10 MHz
Out
(rear panel)

Channel 1

Figure 2-11B. HP 53181A Self Test Troubleshooting Setup

Assembly-Level Service Guide

2-51

Chapter 2 Service
Troubleshooting the Counter

9

If the FAIL message is displayed for a test, use Table 2-5 to
determine which assembly may need replacing.

2

Table 2-5. Troubleshooting

10

NOTE

Failure Indicator

Assembly at Fault

DISP: FAIL

A2 Display Board Assembly, or A1 Motherboard Assembly

CPU: FAIL

A1 Motherboard Assembly

ROM: FAIL

A1 Motherboard Assembly

RAM: FAIL

A1 Motherboard Assembly

EEPROM: FAIL

A1 Motherboard Assembly

HP-IB: FAIL

A1 Motherboard Assembly

QSPI: FAIL

A1 Motherboard Assembly, or A2 Display Board Assembly

FPGA: FAIL

A1 Motherboard Assembly, or A2 Display Board Assembly

FR END: FAIL

A1 Motherboard Assembly, or A4 AC Power Supply Assembly

MEAS: FAIL

A1 Motherboard Assembly, or A4 AC Power Supply Assembly

INTERP: FAIL

A1 Motherboard Assembly, or A4 AC Power Supply Assembly

KEYPAD: FAIL

Keypad, or Front Panel Assembly, or A1 Motherboard Assembly.

PRINT: FAIL

A1 Motherboard Assembly

Refer to Chapter 3, “Replacing Assemblies,” in this service guide
for dissasembly and reassembly procedures.
After replacing an assembly, perform the calibration procedures in this
chapter.

2-52

Assembly-Level Service Guide

3

Replacing Assemblies
Disassembly and Reassembly

Chapter 3 Replacing Assemblies
Introduction

Introduction
This chapter contains the instructions for removing major assemblies in
the HP 53131A/132A/181A. To install an assembly, reverse the removal
instructions.

3

This chapter provides the following disassembly and reassembly
procedures:
•

To Remove the Cover

page 3-4

•

To Remove the Front Bezel

page 3-6

•

To Remove A1 Motherboard Assembly

page 3-9

•

To Remove the A2 Display Board, Keypads, and Window page 3-11

•

To Remove A3 1.5/3.0/5.0/12.4 GHz Channel Assembly
(Option 015/030/050/124)

page 3-13

•

To Remove A4 AC Power Supply Assembly

page 3-15

•

To Remove A5 DC Power Input Assembly (Option 002)

page 3-17

•

To Remove A6 High Stability Timebase Assembly
(Options 001, 010, and 012)

page 3-19

•

To Remove the Rear Terminals (Option 060)

page 3-21

WARNING

HAZARDOUS VOLTAGES ARE ON THE POWER SUPPLY
ASSEMBLY. UNPLUG THE INSTRUMENT, THEN WAIT AT
LEAST SIX MINUTES FOR THE CAPACITORS ON THE POWER
SUPPLY ASSEMBLY TO DISCHARGE BEFORE WORKING ON
THIS INSTRUMENT.

CAUTION

Do not replace assemblies with the instrument turned on. Damage to
components can occur.
Refer to Chapter 5, “Replaceable Parts,” for the part number of the
assemblies.
3-2

Assembly-Level Service Guide

Chapter 3 Replacing Assemblies
Tools Required

Tools Required
The following tools are required for these removal and replacement
procedures:
•

Hand TORX®‚ 10 screwdriver (T10)

•

Hand TORX®‚ 15 screwdriver (T15)

•

7-mm spin tight

•

14-mm deep-socket spin tight

•

Soldering iron—for removing Option 060 Rear Terminals

•

Small (1 point) Pozidriv screwdriver—for removing Option 010/012
oven oscillator from A6 Timebase Support Board

Do This First
3

Before performing any of the removal and replacement procedures, the
following steps must be performed.
1

Turn Counter off.

2

Remove ac line power cord from the rear ac line socket.

Assembly-Level Service Guide

3-3

Chapter 3 Replacing Assemblies
To Remove the Cover

To Remove the Cover
The following steps are for removing the cover. The cover is removed to
access the board and cable assemblies, and all other internal parts.
WHEN THE COVER IS REMOVED FROM THE INSTRUMENT,
LINE VOLTAGES ARE EXPOSED WHICH ARE DANGEROUS AND
MAY CAUSE SERIOUS INJURY IF TOUCHED. DISCONNECT
POWER.

WARNING

1

Turn off the Counter and remove power cord.

2

To remove the rear bezel, loosen the captive screws on the sides
as shown in Figure 3-1 using the TORX 15 screwdriver.

WARNING:

NO OPERATOR SERVICEABLE PARTS INSIDE, REFER SERVICING TO SERVICE TRAINED PERSONNEL.
AC LINE:

3

ISM 1-A

92

FOR LABORATORY USE BY
QUALIFIED PERSONNEL
FOUR USAGE EN LABORATOIRE
PAR PERSONNEL QUALIFIE

OPTIONS
001 MS Oven

!

Ext
Arm

Ref
In

60 VA
100 - 120 VAC
200 - 240 VAC

I
N
P
U
T
S

SERIAL PLATE

2
50/60/400 Hz
50/60 Hz

3

1

10 MHz Out

010 HS Oven

HP-IB

Talk Only
To Configure:
Hold Recall during turn-on.
Osc Adjust

WARNING:

RS - 232

FOR CONTINUED FIRE PROTECTION, USE SPECIFIED ˜ LINE FUSE.

Figure 3-1. Rear Bezel Removal

3-4

Assembly-Level Service Guide

Chapter 3 Replacing Assemblies
To Remove the Cover

3

Remove the screw (H1) located at the bottom near the rear of the
cover (MP3) as shown in Figure 3-2.

H1

MP3

Ext
Arm
Ref
In

10

MH

z Ou

t

3
!

50/60/400 Hz

Talk Only

50/60 Hz

2

60 VA
100 - 120 VAC
200 - 240 VAC

001 MS

AC

E:
LIN

Hold

HP-IB

Recal

figure:
To Con g turn-on.
st
l durin
Osc Adju

Oven

OPTIO

NS

BY
Y USE
ATOR NNEL E
LABOR PERSO ATOIR
FOR FIED LABOR FIE
QUALI E EN QUALI
USAG NNEL
FOUR PERSO
PAR

010 HS

Oven

RS -

232

ISM 1-A

92

SERIAL PLATE

3

Figure 3-2. Bottom View for Cover Removal
4

With one hand gripping the front bezel, pull the cover off with the
other hand by sliding the cover backward.

Assembly-Level Service Guide

3-5

Chapter 3 Replacing Assemblies
To Remove the Front Bezel

To Remove the Front Bezel
1

Remove the cover.
See the section titled “To Remove the Cover” in this chapter.

2

Remove the bail handle (MP7) by rotating it to the vertical
position and pull the ends outward as shown in Figure 3-3.

3

Figure 3-3. Handle Removal
3

Remove the front rubber bumper (part of MP2), stretch a corner
and then slide it off as shown in Figure 3-4.

Figure 3-4. Front Rubber Bumper Removal
4

Disconnect the front bezel flat-ribbon cable (which is actually
A2 Display Board’s cable) from J6 of A1 Motherboard Assembly as
shown in Figure 3-5.
3-6

Assembly-Level Service Guide

Chapter 3 Replacing Assemblies
To Remove the Front Bezel

5

Remove the BNC nuts (H3), shown in Figure 3-5, from the front
panel using the 14-mm deep-socket spin tight.

P/O A2 Display Board Cable
J6
H1
W1

H1

H3

3

H1

Figure 3-5. Front Bezel Removal
6

CAUTION

For Counters with the optional 1.5 GHz or 3.0 GHz channel
(Option 015 or 030), pull cable W1 out of the front bezel as shown
in Figure 3-5. For the optional 5.0 or 12.4 GHz channel, remove
knurled nut.
When reassembling A3 (Option 015/030) Assembly, ensure that cable W1
is not placed or folded on top of the input circuits of A1 Motherboard
Assembly or is tucked behind A3 as the Counter may start reading or
measuring noise.

Assembly-Level Service Guide

3-7

Chapter 3 Replacing Assemblies
To Remove the Front Bezel

Remove the two screws (H1), located in the sides of the front
bezel, using the TORX 15 screwdriver as shown in Figure 3-5.

8

Loosen the screw (H1), shown in Figure 3-5, that helps secure
A1 Motherboard Assembly to the chassis to make step 9 (the
following step) easier.

9

Remove front bezel by pushing inward on the sides of the chassis.

3

7

3-8

Assembly-Level Service Guide

Chapter 3 Replacing Assemblies
To Remove A1 Motherboard Assembly

To Remove A1 Motherboard Assembly
1

Remove the cover.
See the section titled “To Remove the Cover” in this chapter.

2

Remove the Power Supply Assembly.
See the section titled “To Remove A4 AC Power Supply Assembly” in this
chapter.

3

Remove the front bezel.
See the section titled “To Remove the Front Bezel” in this chapter.
If the Counter contains Option 015/030/050/124 1.5/3.0/5.0/12.4 GHz
Channel, disconnect the optional channel’s flat-ribbon cable from
J7 on A1 Motherboard Assembly as shown in Figure 3-6.

5

If the Counter contains one of the optional high stability timebase
assemblies (Option 001, 010, 012), disconnect the flat-ribbon cable
from J6 of A1 Motherboard as shown in Figure 2-8A
(See Chapter 2, “Service.”).

6

If the Counter contains the Option 002 DC Power Input Assembly,
remove it.

3

4

See the section titled “To Remove A5 DC Power Input Assembly
(Option 002)” in this chapter.
7

Remove the two hex screws (H4), shown in Figure 3-6, on the
rear-panel HP-IB connector using the 7-mm spin tight.

Assembly-Level Service Guide

3-9

Chapter 3 Replacing Assemblies
To Remove A1 Motherboard Assembly

H3
H5

H1

H4
J7

H1
A3 1.5/3.0 GHz
Channel Assembly
(Option 015/030)

H5
H1

MP1

3

A1 Motherboard
Assembly

Figure 3-6. A1 Motherboard Assembly Removal
8

Remove the BNC nuts (H3), shown in Figure 3-6, from the rear of
the chassis using the 14-mm deep-socket spin tight (Opt 015/030
only). Remove knurled nut for Option 050.

9

Remove the three screws (H1) in A1 Motherboard Assembly as
shown in Figure 3-6.

10

Finally, slide the motherboard assembly forward.

3-10

Assembly-Level Service Guide

Chapter 3 Replacing Assemblies
To Remove the A2 Display Board, Keypads, and Window

To Remove the A2 Display Board, Keypads,
and Window
1

Remove the cover.
See the section titled “To Remove the Cover” in this chapter.

2

Remove the front bezel.
See the section titled “To Remove the Front Bezel” in this chapter.

3

Note that A2 Display Board Assembly, shown in Figure 3-7, is held
in place by five tabs (two on top and three on bottom) which are
part of the front bezel.

3

A2 Display Board Assembly
P/O Rubber Keypads (MP6)

Front Bezel (MP4)

BNC Nuts (H3)
(Shown with
Optional Channel 3)
Window (MP5)
Cap
P/O Rubber Keypads (MP6)

Figure 3-7. A2 Display Board, Keypad, and Window Removal
Assembly-Level Service Guide

3-11

Chapter 3 Replacing Assemblies
To Remove the A2 Display Board, Keypads, and Window

4

Pull up on the top portion of the front bezel until the top portion
of the display board is free from the top tabs.

5

Pull down on the bottom portion of the front bezel until the
display board is free from the bottom tabs.
If the board is still not free, insert a small flat-blade screw driver or object
between the bottom of the display board and the bezel to gently pry the
board loose from the bottom tabs.

6

When installing A2 Display Board into the front bezel, pull up on the top
portion of the front bezel and press display board into place. Make sure
that the board is positioned all the way into the bezel until the two tabs on
top and three on bottom are visible.

NOTE

7

3

Remove A2 Display Assembly from the front bezel.

Now, remove the POWER key cap by gripping and pulling it.
The cap must be removed to make installation of the A2 Display Board
Assembly easier.

NOTE

8

As shown in Figure 3-7, the rubber keypads (MP6) are now free.
Just pull them out of the bezel.

9

Remove the window (MP5), shown in Figure 3-7, by pressing down
on the two top tabs and sliding the window forward.

3-12

Assembly-Level Service Guide

Chapter 3 Replacing Assemblies
To Remove A3 1.5/3.0/5.0/12.4 GHz Channel Assembly (Option
015/030/050/124)

To Remove A3 1.5/3.0/5.0/12.4 GHz Channel
Assembly (Option 015/030/050/124)
The 1.5 GHz Channel 2 Assembly is available only for the HP 53181A
Frequency Counter.

NOTE

1

Remove the cover.
See the section titled “To Remove the Cover” in this chapter.
Using the 14-mm deep-socket spin tight, remove the BNC nut (H3)
from the optional Channel 3 (or Channel 2 for HP 53181A) input
connector (Options 015/030 only). For Option 050 or 124 remove
the knurled nut using a pair of pliers.

3

Pull W1, which is the optional channel assembly cable, out of the
Channel 3 (or 2) opening in the front panel assembly as shown in
Figure 3-8. For the Option 050 or 124, the connector is part of the
Option assembly.
When reassembling A3 (Option 015/030) Assembly, ensure that cable W1
is not placed or folded on top of the input circuits of A1 Motherboard
Assembly or is tucked behind A3 as the Counter may start reading or
measuring noise.

Assembly-Level Service Guide

3-13

3

CAUTION

2

Chapter 3 Replacing Assemblies
To Remove A3 1.5/3.0/5.0/12.4 GHz Channel Assembly (Option
015/030/050/124)

A3 3 GHz
Channel Assembly
(Shown with Option 015/030)
W1

J7

H2
H2

3

H3

Figure 3-8. Optional Channel Input Assembly Removal
4

Disconnect flat-ribbon cable of the optional channel from
connector J7 of A1 Motherboard Assembly as shown in Figure 3-8.

5

Remove the four (two or three for Option 050 or 124) screws (H2)
attaching the optional channel to the chassis as shown in
Figure 3-8.

6

Remove the optional channel assembly.
3-14

Assembly-Level Service Guide

Chapter 3 Replacing Assemblies
To Remove A4 AC Power Supply Assembly

To Remove A4 AC Power Supply Assembly
1

Remove the cover.
See the section titled “To Remove the Cover” in this chapter.

2

Remove the TORX screw (H1) located in the upper-middle of the
chassis using the TORX 15 screwdriver as shown in Figure 3-9.

A4 AC Power Supply
Assembly

H1

H2

3

H2

J18

Figure 3-9. A4 AC Power Supply Assembly Removal
Assembly-Level Service Guide

3-15

Chapter 3 Replacing Assemblies
To Remove A4 AC Power Supply Assembly

3

Remove the two TORX screws (H2) on the rear panel using the
TORX 10 screwdriver as shown in Figure 3-9.

4

Lift up A4 AC Power Supply Assembly and disconnect its cable
from J18 on A1 Motherboard Assembly to remove the power
supply assembly as shown in Figure 3-9.
When replacing the power supply, order the rubber foot (0403-0424).
Figure 3-10 shows where the rubber foot is located on the defective
assembly.

NOTE

Rubber foot

3

A4 AC Power
Supply Assembly

Figure 3-10. Location of the Rubber Foot
5

If the Counter contains the Option 002 DC Power Input Assembly,
disconnect A4 AC Power Supply’s other cable from Option 002 as
shown in Figure 3-11.

3-16

Assembly-Level Service Guide

Chapter 3 Replacing Assemblies
To Remove A5 DC Power Input Assembly (Option 002)

To Remove A5 DC Power Input Assembly
(Option 002)
1

Remove the cover.
See the section titled “To Remove the Cover” in this chapter.

2

Remove the four TORX 10 screws (H2) that attach A5 DC Power
Input Assembly to the side of the chassis as shown in Figure 3-11.

3

Assembly-Level Service Guide

3-17

Chapter 3 Replacing Assemblies
To Remove A5 DC Power Input Assembly (Option 002)

A5
DC Power Input Assembly
(Option 002)

H2
H2

3

H2

Figure 3-11. DC Power Input Assembly (Option 002) Removal
3

Lift out A5 DC Power Input Assembly and disconnect cable as
shown in Figure 3-11.
3-18

Assembly-Level Service Guide

Chapter 3 Replacing Assemblies
To Remove A6 High Stability Timebase Assembly (Options 001, 010, and
012)

To Remove A6 High Stability Timebase
Assembly (Options 001, 010, and 012)
1

Remove the cover.
See the section titled “To Remove the Cover” in this chapter.

2

Disconnect A6 High Stability Timebase Assembly cable from the
J9 connector on A1 Motherboard Assembly as shown in
Figure 3-12.

3

Assembly-Level Service Guide

3-19

Chapter 3 Replacing Assemblies
To Remove A6 High Stability Timebase Assembly (Options 001, 010, and
012)

A6 High Stability
Timebase Assembly

H2
H2

SERIAL PLATE

3

H2

92

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US L
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TO ON RA
IFI
RA RS BO
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BO PEEN LA
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PA

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J9

!

3

I
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60 VA
100 - 120 VAC 50/60/400 Hz
200 - 240 VAC
50/60 Hz

AC

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INE

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Figure 3-12. Option 001, 010, and 012 A6 High Stability Timebase
Assembly Removal
3

Disconnect the ac power supply’s two-wire cable from A6 High
Stability Timebase Assembly (if the two-wire cable exists).

4

Remove the three TORX 10 screws (H2) attaching the timebase to
the chassis as shown in Figure 3-12.

5

Remove A6 High Stability Timebase Assembly.
3-20

Assembly-Level Service Guide

Chapter 3 Replacing Assemblies
To Remove the Rear Terminals (Option 060)

To Remove the Rear Terminals (Option 060)
1

Remove the cover.
See the section titled “To Remove the Cover” in this chapter.

2

Unsolder the lead-end of the cables from their appropriate ground
and input pads on the A1 Motherboard Assembly (J16, J17) as
shown in Figure 3-13.
For the HP 53131A/132A unsolder the rear chassis INPUTS 1 cable to
J16 and INPUTS 2 to J17.
For the HP 53181A unsolder the rear chassis INPUTS 1 cable to J17.

NOTE

If there are upper or lower shields installed on A1 Motherboard Assembly,
cut them out and then remove Option 060 Rear Terminal cable(s).
Replace the front bezel with the metalized version (53131-40001).

3

Assembly-Level Service Guide

3-21

Chapter 3 Replacing Assemblies
To Remove the Rear Terminals (Option 060)

H6

W1
from
Option 015/030
W2

H3
H6

Remove from J17

H3

3

Remove from J16

J17
(Channel 2 for HP53131A/132A
Channel 1 for HP 53181A)

J16
(Channel 1
for HP53131A/132A)

Figure 3-13. Rear Terminals (Option 060) Removal

NOTE

Options 050 and 124 (5.0 or 12.4 GHz Input) is front panel only.
3-22

Assembly-Level Service Guide

Chapter 3 Replacing Assemblies
To Remove the Rear Terminals (Option 060)

3

Loosen and remove the 2940-0256 BNC nuts (H3) that secure the
coaxial cable(s) to the rear chassis, using the 14-mm deep-socket
spin tight.

4

Pull W2 and washers (H6) out of the rear INPUTS opening(s).

5

Pull the connector-end of W1 and washer (H6) out of the rear
INPUTS opening.

6

Plug opening (s) with MP9 (6960-0159) if you are not going to
re-install Option 060.

3

Assembly-Level Service Guide

3-23

Chapter 3 Replacing Assemblies

3

To Remove the Rear Terminals (Option 060)

3-24

Assembly-Level Service Guide

4

Retrofitting Options

Chapter 4 Retrofitting Options
Introduction

Introduction
This chapter provides the following retrofit procedures:
•

To Retrofit A3 1.5/3.0/5.0/12.4 GHz Channel Assembly
(Option 015/030/050/124)

page 4-3

•

To Retrofit A5 DC Power Input Assembly (Option 002)

page 4-4

•

To Retrofit A6 High Stability Timebase Assembly
(Options 001, 010, and 012)

page 4-11

•

To Retrofit the Rear Terminals (Option 060)

page 4-14

Tools Required
The following tools are required for these retrofitting procedures:
Hand TORX®‚ 10 screwdriver (T10)

•

Hand TORX®‚ 15 screwdriver (T15)

•

7-mm spin tight

•

14-mm deep-socket spin tight

•

Soldering iron—for retrofitting Option 060 Rear Terminals

•

Small (1 point) Pozidriv screwdriver—for securing Option 010/012
oven oscillator to A6 Timebase Support Board

•

pliers

4

•

Do This First
Before performing any of the retrofit procedures, the following steps must
be performed.
1

Turn Counter off.

2

Remove ac line power cord from the rear ac line socket.
4-2

Assembly-Level Service Guide

Chapter 4 Retrofitting Options
To Retrofit A3 1.5/3.0/5.0/12.4 GHz Channel Assembly (Option
015/030/050/124)

To Retrofit A3 1.5/3.0/5.0/12.4 GHz Channel
Assembly (Option 015/030/050/124)
NOTE

Retrofitting to Option 015 (1.5 GHz), Option 030 (3.0 GHz), Option 050
(5.0 GHz), and Option 124 (12.4 GHz) must be performed by technicians at
an HP Service Center.

4

Assembly-Level Service Guide

4-3

Chapter 4 Retrofitting Options
To Retrofit A5 DC Power Input Assembly (Option 002)

To Retrofit A5 DC Power Input Assembly
(Option 002)
Option 002 DC Power Input Assembly Parts
Item

HP Part No.

Qty.

•

Chassis (MP10)

53131-00010

1

•

A5 DC Power Input Assembly

53132-60206

1

•

A4 AC Power Supply Assembly

53132-60207

1

•

Rear label (MP11)

53131-80039

1

•

TORX 10 screws (H2)

0515-0430

4

Option 002 can NOT be installed or combined with Option 060 Rear
Terminals.

NOTE

Preliminary Procedure
1

Remove the cover.
See the section titled “To Remove the Cover” in Chapter 3 of this guide.

2

Remove the front bezel.

4

See the section titled “To Remove the Front Bezel” in Chapter 3 of this
guide.
3

Remove the existing A4 AC Power Supply Assembly.

4

Remove A1 Motherboard Assembly from chassis MP1.
See the section titled “To Remove A1 Motherboard Assembly” in
Chapter 3 of this guide.

4-4

Assembly-Level Service Guide

Chapter 4 Retrofitting Options
To Retrofit A5 DC Power Input Assembly (Option 002)

Retrofitting Procedure
1

Slide A1 Motherboard Assembly into the new chassis (MP10) as
shown in Figure 4-1A.

H3
H5

H1

H4
H1
H5
H1

MP10
A1 Motherboard
Assembly

2

Insert but do not tighten the three TORX 15 screws (H1) that
attach A1 Motherboard Assembly to the new chassis (MP10) as
shown in Figure 4-1A.

3

Insert and tighten the three BNC nuts (H3) onto the BNC
connectors that protrude from the rear of the chassis using the
14-mm deep-socket spin tight.

Assembly-Level Service Guide

4

Figure 4-1A. DC Power Input Assembly Retrofitting

4-5

Chapter 4 Retrofitting Options
To Retrofit A5 DC Power Input Assembly (Option 002)

4

Insert and tighten the two hex screws (H4) and the lock washers
(H5) onto the HP-IB connector that protrudes from the rear of the
chassis using the 7-mm spin tight.

5

Now, re-install the front bezel by performing the front bezel
removal procedure, in Chapter 3 of this guide, in reverse. Be sure
to insert A2 Display Board’s cable into connector J6 on
A1 Motherboard Assembly.

6

Tighten the three H1 screws, shown in Figure 4-1A, to secure the
motherboard to the chassis.

A4 AC Power Supply
Assembly

H1

H2

4

H2

J18

Figure 4-1B. DC Power Input Assembly Retrofitting
4-6

Assembly-Level Service Guide

Chapter 4 Retrofitting Options
To Retrofit A5 DC Power Input Assembly (Option 002)

7

To install the new A4 AC Power Supply Assembly (53132-60207),
connect the ac power supply’s shorter cable to connector J18 on
A1 Motherboard Assembly as shown in Figure 4-1B.

8

Insert and tighten the two TORX 10 screws (H2) to attach
A4 Power Supply Assembly to the rear of the chassis as shown in
Figure 4-1B.

9

Insert and tighten the TORX 15 screw (H1) into the upper-middle
of the chassis as shown in Figure 4-1B.

4

Assembly-Level Service Guide

4-7

Chapter 4 Retrofitting Options
To Retrofit A5 DC Power Input Assembly (Option 002)

10

Install A5 DC Power Input Assembly (53132-60206) into the chassis
by performing the following:
a. First, connect the other ac power supply cable to the connector
on A5 printed-circuit board as shown in Figure 4-1C.
A5
DC Power Input Assembly
(Option 002)

H2
H2

4

H2

Figure 4-1C. DC Power Input Assembly Retrofitting
4-8

Assembly-Level Service Guide

Chapter 4 Retrofitting Options
To Retrofit A5 DC Power Input Assembly (Option 002)

b. Position A5 Power Input Assembly against the rear of the
chassis and align it with the two appropriate holes in the rear
of the chassis.
c. Using the four TORX 10 screws (H2), secure A5 DC Power
Input Assembly to the side of the chassis (MP10) as shown in
Figure 4-1C.
11

To install the rear label (MP11), remove the protective seal from
the back of it and press into place making sure to properly align
the label with the holes in the rear of chassis as shown in
Figure 4-1D.

A4
MP10

SERIAL PLATE

MP11

92

UT
INP
DC 2 VDC
-3

10

A5

Arm

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100 - 120 VAC 50/60/400 Hz
200 - 240 VAC
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R LAB
FIE E EL
FO ALI USAGNN
QUUR SO
FO PER
PAR

ISM
E:

AC

MH

In

!

UTS

INP

Figure 4-1D. DC Power Input Assembly Retrofitting
12

Re-install the cover by performing the cover removal procedure,
in Chapter 3 of this guide, in reverse.

Assembly-Level Service Guide

4-9

Chapter 4 Retrofitting Options
To Retrofit A5 DC Power Input Assembly (Option 002)

13

Note that you will have to assemble your own dc power cable
using 18 AWG connecting wires and a three-pin HP E9640A XLR
(female) connector plug, shown in Figure 4-1E.

Cable wires
connected
to this end

dc-supply (

)

2
3

chassis
ground
(
)

1
dc return (ground)
( )

4

Figure 4-1E. Three-Pin XLR Plug Pinouts (Front View)
14

From the rear of the XLR plug, connect the external power
supply’s supply-side wire to pin 2 of the XLR plug. Connect the
external power supply’s return (ground) wire to pin 1, and the
chassis ground wire to pin 3 of the XLR plug.

15

Observing the correct polarity, attach the other ends of the wires
to a dc source (+10 to +32V dc) to operate the Counter.
This completes the DC Power Input Assembly (Option 002) retrofit
procedure.

4-10

Assembly-Level Service Guide

Chapter 4 Retrofitting Options
To Retrofit A6 High Stability Timebase Assembly (Options 001, 010, and
012)

To Retrofit A6 High Stability Timebase
Assembly (Options 001, 010, and 012)
Option 001 Medium Stability Timebase Assembly Parts
Item

HP Part No.

Qty.

•

A6 Timebase Support Board

53132-60016

1

•

Oven Oscillator

1813-0931

1

•

TORX 10 screws (H2)

0515-0430

3

*Option

010 High Stability Timebase Assembly Parts

Item

HP Part No.

Qty.

•

A6 Timebase Support Board

53132-60016

1

•

Oven Oscillator

10811-60160

1

•

TORX 10 screws (H2)

0515-0430

3

•

Pozidriv screws (H7)

2360-0331

2

*Option

012 Ultra-High Stability Timebase Assembly

Parts
HP Part No.

Qty.

•

A6 Timebase Support Board

53132-60016

1

•

Oven Oscillator

10811-60260

1

•

TORX 10 screws (H2)

0515-0430

3

•

Pozidriv screws (H7)

2360-0331

2

*

4

Item

These options can be installed or retrofitted in Counters that have firmware revisions 3402 and greater only.
Contact your local HP Service Center for more information.

Assembly-Level Service Guide

4-11

Chapter 4 Retrofitting Options
To Retrofit A6 High Stability Timebase Assembly (Options 001, 010, and
012)

Procedure
1

Turn off the Counter and remove power cord.

2

Remove the cover.
See the section titled “To Remove the Cover” in Chapter 3 of this guide.

3

If you are retrofitting the Option 001 Medium Stability Timebase
Assembly, go to step 5.
If you are retrofitting the Option 010 High Stability or Option 012
Ultra-High Stability assembly, go to step 4 (the next step).

4

Plug the oven oscillator into the socket on A6 Timebase Support
Board, and secure the oven oscillator to A6 using the two Pozidriv
screws (H7) as shown in Figure 4-2.

5

Plug the oven oscillator into the socket on A6 Timebase Support
Board, and secure the oven oscillator to A6 using the two Pozidriv
screws (H7) as shown in Figure 4-2.

6

If you are retrofitting the Option 001 Medium Stability Timebase,
remove the jumper cap on P1 of A6 Timebase Support Board as
shown in Figure 4-2.

4

If you are retrofitting the Option 010 High Stability and Option
012 Ultra-High Stability timebases, DO NOT remove the jumper
cap on P1.
7

Mount A6 High Stability Timebase Assembly on the left side using
three TORX 10 screws (H1) as shown in Figure 4-2.

8

Plug the power supply assembly’s two-wire cable into the
three-prong connector (J2) on the high stability timebase
assembly as shown in Figure 4-2 (if the two-wire cable exists).

9

Connect A6 High Stability Timebase Assembly cable to connector
J9 on A1 Motherboard Assembly as shown in Figure 4-2.
4-12

Assembly-Level Service Guide

Chapter 4 Retrofitting Options
To Retrofit A6 High Stability Timebase Assembly (Options 001, 010, and
012)

H7
H7

A6 High Stability
Timebase Assembly

P1

J2
Jumper cap
H2
H2

SERIAL PLATE

H2

92

BY

E:

2

1

J9

!

3
f
Re
In

LIN

001

Ov
MS
-IB
HP y

lk

n. S rn-o R

2

23

g tu
ure: rin
fig l du
t
Con al
us
To Rec
Adj
d
Osc
Hol

Onl

Ta

t

u
zO

10

MH

4

I
N
P
U Ext
T rm
S A

60 VA
100 - 120 VAC 50/60/400 Hz
200 - 240 VAC
50/60 Hz

AC

E
IRE
L
NE RATO
1-A TORYONUSBO
E
IFI
ISMR LAIFIBOEDAGRAPEENEENRSLLAQUAL
FO AL US ON
QUUR RS
NS Oven
FOR PE
PA
TIO 0 HS
OPen 01

Figure 4-2. High Stability Timebase Retrofitting (Option 001, 010, 012)
10

Re-install the cover by performing the cover removal procedure,
in Chapter 3 of this guide, in reverse.
This completes A6 High Stability Timebase Assembly retrofit procedure.

11

Perform the appropriate timebase calibration procedure as found
on page 2-23 and page 2-24.
Assembly-Level Service Guide

4-13

Chapter 4 Retrofitting Options
To Retrofit the Rear Terminals (Option 060)

To Retrofit the Rear Terminals (Option 060)
Option 060 Rear Terminals Parts

1

Item

HP Part No. Qty.

•

Coaxial cable assembly (W2)

8120-6150

2

•

BNC washer (H6)

2190-0068

2

•

BNC nut (H3)

2940-0256

2

Remove the cover.
See the section titled “To Remove the Cover” in Chapter 3 of this guide.

2

For retrofitting the HP 53131A or HP 53132A that do NOT contain
the Optional Channel 3 (Option 030), push out INPUTS plugs 1
and 2 (located on rear of chassis) as shown in Figure 4-3A.
For retrofitting the HP 53131A or HP 53132A that contain the
Optional Channel 3 (Option 030), push out INPUTS plugs 1, 2,
and 3 (located on rear of chassis) as shown in Figure 4-3A.
For retrofitting HP 53181As that do NOT contain the optional
Channel 2 (Option 015/030), push out INPUTS plug 1 (located on
rear of chassis) as shown in Figure 4-3A.

4

For retrofitting the HP 53181As that contain the optional
Channel 2, push out INPUTS plugs 1 and 2 (located on rear of
chassis) as shown in Figure 4-3A. See the following NOTE.

NOTE

The HP 53131A and 53132A front and rear terminals can be in parallel for
inputs 1 and 2. However, the optional Channel 3 input (Option 030) can be
configured as rear terminals only or front terminals only. The
optional Channel 3 inputs (Option 050 or 124) can be front terminal only
(53131A, 53132A, 53181A).

4-14

Assembly-Level Service Guide

Chapter 4 Retrofitting Options
To Retrofit the Rear Terminals (Option 060)

NOTE

For the HP 53181A, the front and rear terminals can exist for Channel 1.
However, HP 53181A’s optional Channel 2 input (Option 015/030) can be
configured as rear terminals only or front terminals only.

NOTE

If there are upper or lower shields installed on A1 Motherboard Assembly,
cut them out and replace the front bezel with the metallized version
(53131-40001).

Panel

Plug (MP9)

Figure 4-3A. Plug Removal for Rear Terminals Retrofitting
3

Remove the end of the optional channel (Option 015/030) coaxial
cable (W1) that is connected to the front-panel and insert it through
the appropriate rear INPUTS opening (3 for HP 53131A/132A;
2 for HP 53181A) as shown in Figure 4-3B.

4

Assembly-Level Service Guide

4-15

Chapter 4 Retrofitting Options
To Retrofit the Rear Terminals (Option 060)

H6

W1
from
Option 015/030
W2

MP9
H6
MP9

To J17
To J16

4

J17
(Channel 2 for HP53131A/132A
Channel 1 for HP 53181A)

J16
(Channel 1
for HP53131A/132A)

Figure 4-3B. Rear Terminals Retrofitting
4-16

Assembly-Level Service Guide

Chapter 4 Retrofitting Options
To Retrofit the Rear Terminals (Option 060)

4

Insert the connector-end of the W1, with the washers (H6) in place
on the connector, through the appropriate rear INPUTS opening.

5

Insert and tighten the BNC nuts (H3) to secure the coaxial cables
to the rear of the chassis.

6

Solder the lead-end of the cables to their appropriate ground and
input pads on A1 Motherboard Assembly (J16, J17)
For the HP 53131A/132A solder the rear chassis INPUTS 1 cable to J16
and INPUTS 2 to J17. (See Figure 4-3B.)
For the HP 53181A solder the rear chassis INPUTS 1 cable to J17.
(See Figure 4-3B.)

7

Re-install the cover by performing the cover removal procedure,
in Chapter 3 of this guide, in reverse.
This completes the Rear Terminals (Option 060) retrofit procedures.

NOTE

When using the front terminals of Inputs 1 and 2, the rear terminals
should be terminated with a 50-ohm load (such as part number 1250-0207).
When using the rear terminals, these loads should be placed on the front
terminals, or the 50-ohm input button selected (but not both).

4

Assembly-Level Service Guide

4-17

Chapter 4 Retrofitting Options

4

To Retrofit the Rear Terminals (Option 060)

4-18

Assembly-Level Service Guide

5

Replaceable Parts

Chapter 5 Replaceable Parts
Introduction

Introduction
This chapter contains information for ordering parts. Table 5-1 lists the
exchange assemblies. Table 5-2 lists reference designations used in the
parts list and throughout the guide, and Table 5-3 lists all replaceable
assemblies and parts for the HP 53131A/132A/181A Counter. Table 5-4 is
a list of manufacturer’s code numbers given in the parts list (Table 5-3).
It contains the names and addresses corresponding to the code number of
the manufacturer. Figure 5-1 is an exploded view of the
HP 53131A/132A/181A.

Exchange Assemblies
Table 5-1 lists assemblies within the HP 53131A/132A/181A that may be
replaced on an exchange basis. Factory repaired and tested exchange
assemblies are available only on a trade-in basis. Defective assemblies
must be returned for credit. (Note that the part numbers for the new and
exchange assemblies are also listed in Table 5-3.)
Table 5-1. Exchange Assemblies
Assembly Name

HP Part No.

Exchange Part No.*

A1 Motherboard (HP 53131A)

53131-60004

53131-69004

A1 Motherboard (HP 53132A)

53132-60014

53132-69014

A1 Motherboard (HP 53181A)

53181-60004

53181-69004

Option 015, 1.5 GHz

n/a

53132-60003

Option 030, 3 GHz

n/a

53132-60003

Option 050, 5 GHz

n/a

53132-69211

Option 124, 12.4 GHz

n/a

53132-69212

A6 High Stability Oven Timebase (Option 010)

10811-60160

10811-69160

A6 Ultra-High Stability Oven Timebase (Option 012)

10811-60260

10811-69260

5

A3 Channel 3 Input Board

* Exchange part availability subject to change without notice. Contact your local Hewlett-Packard Sales Office for current information.

5-2

Assembly-Level Service Guide

Chapter 5 Replaceable Parts
Reference Designations

Reference Designations
Table 5-2 lists the reference designations used in the parts lists, block
diagrams, and throughout the guide.

Replaceable Parts
Table 5-3 is a list of replaceable parts and is organized as follows:
Electrical assemblies in alphanumerical order by reference designation.
1. Electrical assemblies in alphanumerical order by reference
designation.
2. Chassis-mounted electrical parts in alphanumerical order by
reference designation.
3. Chassis-mounted mechanical parts in alphanumerical order by
reference designation.
The information given for each part consists of the following:
1. Reference designation.
2. Hewlett-Packard part number.
3. Part number check digit (CD).
4. Total quantity (QTY) in instrument. The total quantity is given once
and at the first appearance of the part number in the list.
5. Description of the part.
6. Typical manufacturer’s part number for the part.

5

Assembly-Level Service Guide

5-3

Chapter 5 Replaceable Parts
How To Order A Part

How To Order A Part
Hewlett-Packard wants to keep your parts ordering process as simple and
efficient as possible. To order parts perform the following steps:
1

Identify the part and the quantity you want.

2

Determine the ordering method to be used and contact Hewlett-Packard.

Parts Identification
To identify the part(s) you want, first refer to the exploded view in
Figure 5-1 at the back of this chapter or Figure 2-8A and Figure 2-8B in
Chapter 2, “Service.”
When ordering from Hewlett-Packard, the important numbers to note
from the Parts List are the HP Part Number and part-number check digit
(in the “CD” column), and the quantity of the part you want.
If the part you want is NOT identified in the guide, you can call on
Hewlett-Packard for help (see the following section titled “Contacting
Hewlett-Packard”). Please have the following information at hand when
you contact HP for help:
Instrument Model Number (example, “HP 53131A”).

•

Complete instrument Serial Number (example, “1234A56789”).
Information about where to find the serial number is given in the
preface of this guide in the section titled “How to Use This Guide.”

•

Description of the part and its use.

•

Quantity of the part required.

5

•

5-4

Assembly-Level Service Guide

Chapter 5 Replaceable Parts
How To Order A Part

Contacting Hewlett-Packard
Depending on where you are in the world, there are one or more ways in
which you can get parts or parts information from Hewlett-Packard.
•

Outside the United States, contact your local HP sales office.

•

Within the United States, we encourage you to order replacement
parts or request parts information directly by telephone or mail from
the HP Support Materials Organization, using the telephone numbers
or address listed on the next page. (You can also contact your local
HP sales office. HP sales offices are listed at the back of this package.)

By telephone:
–

For Parts Ordering use our toll-free number, (800) 227-8164,
Monday through Friday (except Holidays), 6 a.m. to 5 p.m.
(Pacific Time).
If you need a part in a hurry, an extra-cost Hotline phone ordering
service is available 24 hours a day. Use the toll-free number above
at the times indicated; at other times, use (916) 785-8460.

–

For Parts Identification Assistance, call us at (916) 783-0804
Our Parts Identification hours are from Monday through Friday,
6 a.m. to 5 p.m. (Pacific Time).

For mail correspondence, use the address below:
Hewlett-Packard
Support Materials Roseville
P. O. Box 1145
Roseville, CA 95661-1145

5

Assembly-Level Service Guide

5-5

Chapter 5 Replaceable Parts
Cabinet Parts and Hardware

Cabinet Parts and Hardware
To locate and identify miscellaneous cabinet and chassis parts and
instrument hardware, refer to Figure 2-8A, Figure 2-8B, and Figure 5-1.
These figures provide different views of the instrument, with the parts
identified by reference designations; the reference designations
correspond with the ones in Table 5-3.
Table 5-2. Reference Designation
A = assembly

P/O= part of

H = hardware

S = switch

J

T = transformer

= electrical connector
(stationary portion); jack

TP = test point
U = integrated circuit; microcircuit

P = electrical connector
(movable portion); plug

W = cable; transmission path; wire

5

MP = miscellaneous mechanical part

5-6

Assembly-Level Service Guide

Chapter 5 Replaceable Parts
Cabinet Parts and Hardware

Table 5-3. HP 53131A/132A/181A Replaceable Parts
Mfr Part Number

EXCHANGE ELECTRONIC ASSEMBLIES
MOTHERBOARD
MOTHERBOARD (EXCHANGE RESTORED)
MOTHERBOARD
MOTHERBOARD (EXCHANGE RESTORED)

28480
28480
28480
28480

53131-60004
53131-69004
53132-60014
53132-69014

1
1

MOTHERBOARD
MOTHERBOARD (EXCHANGE RESTORED)

28480
28480

53181-60004
53181-69004

5
3

1
1
1
1

OPTION 015, 1.5 GHz INPUT BOARD (RESTORED)
OPTION 030, 3 GHz INPUT BOARD (RESTORED)
OPTION 050, 5 GHz INPUT BOARD (RESTORED)
OPTION 124, 12.4 GHz INPUT BOARD (RESTORD)

28480
28480
28480
28480

53132-60003
53132-60003
53132-69211
53132-69212

53131-60002

3

1

ELECTRONIC ASSEMBLIES
DISPLAY BOARD

28480

53131-60002

A4 (Standard)
A4 (Option 002)
A4 (Option 010/012)

0950-2496
53132-60207
53132-60208

7
1
2

1
1
1

AC POWER SUPPLY (STANDARD)
OPTIONAL AC POWER SUPPLY (002)
OPTIONAL AC POWER SUPPLY (010 OR 012)

28480
28480
28480

0950-2496
53132-60207
53132-60208

A5 (Option 002)

53132-60206

0

1

OPTIONAL DC POWER SUPPLY (002)

28480

53132-60206

H1
H2
H3
H4
H5
H6

0515-0433
0515-0430
2940-0256
0380-1332
2190-0577
0590-0505

6
3
4
7
1

6
3
2
2
2
1

CHASSIS PARTS
SCREW-MACH TORX 15
SCREW-MACH TORX 10
NUT-BNC
SCREW-STDF, HP-IB CONN HEX
WASKER-LOCK
NUT-KNURLED

00000
00000
00000
00000
00000
00000

ORDER BY DESCRIPTION
ORDER BY DESCRIPTION
ORDER BY DESCRIPTION
ORDER BY DESCRIPTION
ORDER BY DESCRIPTION
ORDER BY DESCRIPTION

MP1
MP1 (Option 002)
MP2
p/o MP2
p/o MP2
MP3
MP4
MP5 (HP 53131A)
MP5 (HP 53132A)
MP5 (HP 53181A)

53131-00001
53131-00010
34401-86010
34401-86011
34401-86012
53131-00012
53131-40009
53131-40015
53132-40003
53181-40013

6
6

9
8
6
3
4

1
1
1
1
1
1
1
1
1
1

CHASSIS
CHASSIS, OPTION 002
FRONT/REAR RUBBER BUMPER KIT
FRONT RUBBER BUMPER
REAR RUBBER BUMPER
COVER
FRONT BEZEL
WINDOW FOR HP 53131A
WINDOW FOR HP 53132A
WINDOW FOR HP 53181A

28480
28480
28480
28480
28480
28480
28480
28480
28480
28480

53131-00001
53131-00010
34401-86010
34401-86011
34401-86012
53131-00012
53131-40009
53131-40015
53132-40003
53181-40013

MP6
(HP 53131A/132A)
MP6 (HP 53181A)
MP7
MP8
MP9

53131-40010

1

KEYPADS FOR HP 53131/132A

28480

53131-40010

53181-40012
34401-45011
53131-80038
6960-0167
0403-0424
5041-0564

3

KEYPADS FOR HP 53181A
HANDLE
REAR LABEL
PLUG, HOLE 0.5-IN DIA
RUBBER FOOT, BLACK
CAP

28480
28480
28480
28480
76381
28480

53181-40012
34401-45011
53131-80038
6960-0167
SJ-5023
5041-0564

HP Part
Number

C
D

Qty

Description

A1 (HP 53131A)

53131-60004
53131-69004
53132-60014
53132-69014

2
0
8
6

1
1
1
1

A1 (HP 53181A)

53181-60004
53181-69004

2
0

A3 (HP 53181)
A3
A3
A3

53132-60003
53132-60003
53132-69211
53132-69212

A2

A1 (HP 53132A)

7
2
8
4

1
1
3
1
1

Assembly-Level Service Guide

5

Mfr
Code

Reference
Designation

5-7

Chapter 5 Replaceable Parts
Cabinet Parts and Hardware

Table 5-3. HP 53131A/132A/181A Replaceable Parts (continued)
Reference
Designation

OPTION 001
A6
H2
OPTION 002
A5
MP10
MP11

OPTION 010
A6

H2
H7
OPTION 012
A6

H2
H7
OPTION 015
A3

C
D

Qty

Description

Mfr
Code

Mfr Part Number

34401-88304

3

1

REAR PLASTIC BEZEL

28480

34401-88304

53132-60008
1813-0931
0515-0430

0
2
3

1
1
3

MEDIUM STABILITY TIMEBASE ASSY
TIMEBASE SUPPORT BOARD
OSCILLATOR-OVEN
SCREW-MACH TORX 10

28480
28480
00000

OPTION 001
53131-60008
1813-0931
ORDER BY DESCRIPTION

53132-60206
53131-00010
53131-80039
0515-0372
E9640A

0
7
8
3
6

1
1
1
4
1

DC POWER INPUT ASSY
DC POWER INPUT ASSY
CHASSIS FOR OPT 002
REAR LABEL
SCREW-MACH TORX 10 8MM LG
XLR 3-11 CONNECTOR

28480
28480
28480
00000
05276

OPTION 002
53132-60206
53131-00010
53131-80039
ORDER BY DESCRIPTION
5109 3-11

3
6

3
1
1
3
1

HIGH STABILITY TIMEBASE ASSY
AC POWER SUPPLY ASSY FOR OPT 010
AC POWER SUPPLY ASSEMBLY
OSCILLATOR-OVEN
SCREW-MACH TORX 10
SCREW-MACH POZIDR 6-32 0.25-IN-LG

28480
28480
28480
00000
00000

OPTION 010
53132-60016
53132-60208
10811-60160
ORDER BY DESCRIPTION
ORDER BY DESCRIPTION

3
6

3
3
1
4
1

ULTRA-HIGH STABILITY TIMEBASE ASSY
AC POWER SUPPLY ASSY FOR OPT 010
AC POWER SUPPLY ASSY FOR OPT 010
OSCILLATOR-OVEN
SCREW-MACH TORX 10
SCREW-MACH POZIDR 6-32 0.25-IN-LG

28480
28480
28480
00000
00000

OPTION 012
53132-60008
53132-60208
10811-60211
ORDER BY DESCRIPTION
ORDER BY DESCRIPTION

7
6
3

1
1
1
4

1.5 GHz CHANNEL ASSY
1.5 GHz CHANNEL ASSY
CABLE-COAXIAL INPUT
WINDOW, 1.5 GHz, FOR HP 53181A ONLY
SCREW-MACH TORX 10

28480
28480
28480
00000

7
5
3

1
1
1
4

3.0 GHz CHANNEL ASSY
3.0 GHz CHANNEL ASSY
CABLE-COAXIAL INPUT
WINDOW, 3.0 GHz, FOR HP 53181A ONLY
SCREW-MACH TORX 10

28480
28480
28480
00000

1
3
1
1
1
1
1

5.0 GHz CHANNEL ASSY
5.0 GHz CHANNEL ASSY
SCREW-MACH TORX 10
FRONT PANEL, OPT 050
FRONT PANEL, OPT 050 (53181 only)
KNURLED NUT
WINDOW, 5 GHz, FOR HP 53181A ONLY
BEZEL

28480
00000
28480
28480
28480
28480
28480

53132-60016
53132-60208
10811-60160
0515-0430
2360-0331

53132-60008
53132-60208
10811-60260
0515-0430
2360-0331

MP5 (HP 53181A only)
H2

Exchange only
8120-6142
53181-40015
0515-0430

OPTION 030
A3
W1
MP5 (HP 53181A only)
H2

Exchange only
8120-6142
53181-40014
0515-0430

OPTION 050
A3

5

HP Part
Number

MP4
MP4
MP5 (HP 53181A only)
MP2

Exchange only
0515-0430
53131-40016
53131-40017
0590-0505
53181-40017
53131-40014

5-8

2

3
8
1
8
5

OPTION 015
8120-6142
53181-40015
ORDER BY DESCRIPTION
OPTION 030
8120-6142
53131-40014
ORDER BY DESCRIPTION
OPTION 050
ORDER BY DESCRIPTION
53131-40016
53131-40017
0590-0505
53181-40017
53131-40014

Assembly-Level Service Guide

Chapter 5 Replaceable Parts
Cabinet Parts and Hardware

P/O MP2

MP7

A5
(Option 002)
MP3

MP8
(MP11 for Option 002)

A3
A4

A2

A6
(Option 001,
010, or 012)
A1
MP1
(MP10 for Option 002)

MP5
(HP 53181A only)
MP4

5

P/O MP2

Figure 5-1. HP 53131A/132A/181A Exploded View (Chassis Parts and
Assemblies)
Assembly-Level Service Guide

5-9

Chapter 5 Replaceable Parts
Cabinet Parts and Hardware

Table 5-3. HP 53131A/132A/181A Replaceable Parts (Continued)
Reference
Designation

HP Part
Number

C
D

Qty

OPTION 060
W2

8120-6150

7

2

H6
H3

2190-0068
2940-0256

3
4

OPTION 124
A3
H2
MP4
MP5 (HP 53181A only)
H6
MP2

Exchange only
0515-0430
53131-40008
53181-40009
0590-0505
53131-40014

Description

Mfr
Code

Mfr Part Number

28480

OPTION 060
8120-06150

2
2

REAR TERMINALS
CABLE-COAXIAL ASSY (Only one is needed for the
HP 53131A)
WASHER-BNC
NUT-BNC (Only one is needed for 53181A)

00000
00000

ORDER BY DESCRIPTION
ORDER BY DESCRIPTION

1
2
1
1
1
1

12.4 GHz CHANNEL ASSY
12.4 GHz CHANNEL 3 ASSY
SCREW-MACH TORX 10
FRONT PANEL, OPT 124
WINDOW, 12.4 GHz, FOR HP 53181A ONLY)
NUT-KNURLED
BEZEL

28480
28480
28480
28480
28480
28480

OPTION 124
ORDER BY DESCRIPTION
53131-40008
53181-40009
0590-0505
53131-40014

Table 5-4. Manufacturer’s Code List.
Manufacturer Name

Address

00000
28480
76381
05276

ANY SATISFACTORY SUPPLIER
HEWLETT-PACKARD CO CORPORATE HQ
3M CO
ITT POMONA ELECTRONICS DIV

PALO ALTO
ST PAUL
POMONA

Zip Code
CA
MN
CA

94304
55144
91766

5

Mfr Code

5-10

Assembly-Level Service Guide

6

Backdating
Manual Changes

Chapter 6 Backdating
Introduction

6

Introduction
This chapter contains information necessary to adapt this guide to apply
to older instruments.
The backdating information includes the following:
• Backdating Hardware

page 6-3

• Backdating Firmware

page 6-8

• Backdating Specifications

page 6-16

Manual Changes
This guide applies directly to Counters with the following serial prefixes
listed in Table 6-1.
Table 6-1. Instrument this Guide Directly Applies To
Instrument

Serial Prefix Number

HP 53131A Universal Counter

3711

HP 53132A Universal Counter

3710

HP 53181A Frequency Counter

3711

As engineering changes are made, newer instruments may have higher
serial prefix numbers than the one shown on the title page of this guide.
The guides for these instruments will be supplied with “Manual Updating
Changes” package containing the required information. Replace the
affected pages or modify existing guide information as directed in the
pages of the Manual Updating Changes package. Contact the nearest
Hewlett-Packard Sales and Support Office.

Older Instruments
To adapt this guide to older HP 53131A/132A/181A Counters having a
serial prefix lower than 3711, perform the backdating provided in the
following sections.
6-2

Assembly-Level Service Guide

Chapter 6 Backdating
Backdating Hardware

Backdating Hardware
6

CHANGE 1 (Below Series Prefix 3711A)
Page 2-40, Table 2-1. HP 53131A Assembly Identification:
Change A1 Motherboard part number from 53131-60004 to
53131-60001.
Page 2-42, Table 2-3. HP 53181A Assembly Identification:
Change A1 Motherboard part number from 53181-60004 to
53181-60001.
Page 5-7, Table 5-3. HP 53131A/132A/181A Replaceable Parts:
53131A—Change A1 Motherboard part number from 53131-60004 to
53131-60001.
53181A—Change A1 Motherboard part number from 53181-60004 to
53181-60001.

CHANGE 2 (New A3 5/12.4 GHz Prescaler Assembly)
Page 2-40/Page 2-42, Table 2-1/Table 2-3. HP 53131A/132A/181A
Assembly Identification:
Change A3 Channel 3 Input Board (Option 050) part number from
53132-60212 to 53132-60211; exchange part numbers change from
53132-69212 to 53132-69211.
Page 5-7, Table 5-3. HP 53131A/132A/181A Replaceable Parts:
Change A3 Channel 3 Input Board (Option 050) part number from
53132-60212 to 53132-60211; exchange part numbers change from
53132-69212 to 53132-69211.

Assembly-Level Service Guide

6-3

Chapter 6 Backdating
Backdating Hardware

CHANGE 3 (New TCXO boards)
Page 2-47. Troubleshooting the Counter

If the Counter under test contains Option 010 or 012 High
Stability Timebase, perform the following:
a. Disconnect the power supply’s two-wire cable from J2 of
A6 High Stability Timebase Assembly as shown in Figure 2-10.

A6
High Stability
Timebase
Assembly

GND
(Wht)

-9V
(Gray)

J2
A4
AC Power Supply
Assembly

SERIAL PLATE

4a

92

BY

E:

AC

2

1
!

3

I
N
P
U Ext
T rm
S A

60 VA
100 - 120 VAC 50/60/400 Hz
200 - 240 VAC
50/60 Hz

6

Add the following as step 4a:

LIN

E
1-AATORYONUSNEORLFIEATOIRE
ALI
ISMR LABFIEORAGD PEENEENRSLLAB
QU
FO ALI US ON
QUUR RS
NS Oven
FOR PE
PA
TIO 0 HS
OP 01

en

001

Ov
MS
-IB
HP

ly

n. S rn-o R

2

23

g tu
ure: rin
nfig du
Co call
just
To Re
c Ad
ld
Os
Ho

lk On

Ta

ut

zO

Ref
In

10

MH

Figure 2-10. A4 AC Power Supply -9V Output Check (Option 010/012
Only)
6-4

Assembly-Level Service Guide

Chapter 6 Backdating
Backdating Hardware

Verify a reading of −9.0 ± 0.45 V.
Page 5-7, Table 5-3. HP 53131A/132A/181A Replaceable Parts:
Change A6 Options 001, 010, and 012 Timebase Support Board from
53132-60016 to 53132-60008.
Change A6 Option 010 Oscillator-Oven from 10811-60160 to
10811-60111.
Change A6 Option 012 Oscillator-Oven from 10811-60260 to
10811-60211.

CHANGE 4 (Series 3710A to 3705A)
53132A Only (Firmware Revision 3646A to 3546A)
Page 2-41, Table 2-2. HP 53132A Assembly Identification:
Change A1 Motherboard part number from 53132-60014 to
53132-60001.
Page 5-7, Table 5-3. HP 53131A/132A/181A Replaceable Parts:
Change A1 Motherboard (53132A) part number from 53132-60014 to
53132-60001.

Assembly-Level Service Guide

6-5

6

b. Connect the negative lead of a voltmeter to the white wire
connection (GND) on the connector of the two-wire cable, and
connect the positive lead to the gray wire connection (−9V) as
shown in Figure 2-10.

Chapter 6 Backdating
Backdating Hardware

CHANGE 5 (Series 3705A to 3546A, 3548A)

6

Chassis color change only.
Page 5-7/Page 5-10, Table 5-3. HP 53131A/132A/181A Replaceable Parts:
Reference Designator/
Description

Series 3705A

Series 3546A (53131A/132A)
Series 3548A (53181A)

MP2 Bumper/Cover Kit

34401-86010

34401-86000

MP3 Cover

53131-00012

53131-00002

MP4 Front Bezel (53131/132A)
MP4 Front Bezel (53181A)

53131-40009
53181-40011

53131-40001
53181-40001

MP5 Window (53131A)
MP5 Window (53132A)
MP5 Window (53181A)

53131-40015
53132-40003
53181-40013

53131-40002
53132-40001
53181-40003

MP6 Keypad

53131-40010

53131-40003

MP7 Handle

34401-45011

34401-45001

MP8 Rear Label

53131-80038

53131-80002

Kit-Rack Mount

5063-9240

5062-3972

53131-80039

53131-80013

53181-40015

53181-40005

53181-40014

53181-40004

Front Panel, 5 GHz (53131/132A)

53131-40012

53131-40006

Front Panel, 5 GHz (53181A)

53181-40016

53181-40006

MP5 Window, 5 GHz (53181A)

53181-40017

53181-40007

Option 002
MP10 Option 002 Rear Label

Option 015
MP5 Window 1.5 GHz (53181A)

Option 030
MP5 Window, 3.0 GHz (53181A)

Option 050

CHANGE 6 (Below Series Prefix 3416A)
This change deleted three unnecessary connectors from the A1
(53131-60001) board.

6-6

Assembly-Level Service Guide

Chapter 6 Backdating
Backdating Hardware

CHANGE 7 (Below Serial Number 3349A01906)
Page 5-7, Table 5-3. Replaceable Parts, under A1 (for the HP 53131A):
Add 53131-00004; 9; 1; SHIELD UPPER; 28480; 53131-00004

1

Add 53131-00005; 0; 1; SHIELD LOWER; 28480; 53131-00005

1Add
1

6

1

53131-00008; 3; 1; SHIELD CHASSIS; 28480; 53131-00008

Add 53131-00009; 4: 1; GROUND CONNECTION 28480; 53131-00009

Change A4 (Standard) HP Part Number from 0950-2496 to 0950-2139.
Note: A4 AC Power Supply Assembly 0950-2496 allows 400 Hz
operation from 100-120V.
1

These shields were needed to reduce susceptibility to EMI. However, the
shields are not needed on A1 Motherboard Assembly if the metalized
front bezel is used in the Counter. Thus, when you order a new
A1 Motherboard Assembly (53131-60001, same part number as the old
A1) for your HP 53131A Counter, you need to order a new metalized
front bezel (53131-40003, same part number of the old non-metalized
front bezel).

CHANGE 8 (Below Serial Prefix 3404A)
Page 5-7, Table 5-3. Replaceable Parts:
Change, under OPTION 001, A6 HP Part Number from 53132-60008
to 53132-60004.
Change, under OPTION 001, 1812-0931; OSCILLATOR-OVEN;
to 1812-0932; OSCILLATOR-OVEN.
Change, under OPTION 010, A6 HP Part Number from 53132-60008
to 53132-60005.
Change, under OPTION 011, 10811-60111; OSCILLATOR-OVEN;
to BLILEY OSCILLATOR-OVEN.
Assembly-Level Service Guide

6-7

Chapter 6 Backdating
Backdating Firmware

Backdating Firmware
6

CHANGE 1 (Firmware Revisions 3317, 3335, 3402, 3427)
(Note: firmware revision 3413 added the new security menu item and
the new Calibration Menu to the HP 53131A Counter.)
(Note: firmware revision 3427 was set up to work with the new FPGA
[Xilinx 3042A]; and shortens TI delay from 1 ms to 100ms. This
revision is backward compatible.
Page 2-6 thru Page 2-15 (“About the HP 53131A/132A Calibration Menu,”
and “The HP 53131A/132A Calibration Procedures” sections).
Replace with the following calibration information and procedures:

About the HP 53131A Calibration Menu
The Utility menu is accessed by holding the Recall key and cycling
POWER key.

POWER

Utility Menu:
Hold at power up

Utility
Recall

The Utility menu’s calibration items, illustrated on the following page,
provide you with the functions to:
•

6-8

initiate the Counter’s calibration routines, which can perform
automatic calibration of the voltage offset and gain of the front-end
input amplifiers, and optional timebase
(CAL: OFFS 1 / 2 ?, GAIN 1 / 2 ?, TIMEBAS ?, and TI 1Å2?).

Assembly-Level Service Guide

Chapter 6 Backdating
About the HP 53131A Calibration Menu

CHANGE 1 (Firmware Revisions 3317, 3335, 3402, 3427)
(Continued)

NOTE

6

The HP 53131A Utility/Calibration Menu Tree
Turn power off, press and hold Recall (Utility) key, then press POWER
key to access this menu.

POWER

Utility
Recall

On / Stby

REV: XXXX
TEST: ALL?

BAUD: 9600

TIMEBAS: AUTO

TEST: DISP?

BAUD: 19200

TIMEBAS: I NT

TEST: CPU?

BAUD: 300

TIMEBAS: EXT

TEST: ROM?

BAUD: 1200

CAL: OFFS 1?

TEST: RAM?

BAUD: 2400

CAL: OFFS 2?

TEST: EEPROM?

PARITY: OFF

CAL: GAIN 1?

TEST: HP-IB?

PARITY: EVEN

CAL: GAIN 2?

TEST: QSPI?

PARITY: ODD

* CAL:TIMEBAS?
CAL:TI 1 2?

TEST: FPGA?

SW PACE: XON

TEST: FR END?

SW PACE: NONE

TEST LOOP: OFF

TEST: MEAS?

DTR: HIGH

TEST LOOP: ON

TEST: INTERP?

DTR: LIMIT

TST PRINT:OFF

TEST: KEYPAD?

DTR: HW PACE

TST PRINT: ON

TEST: PRINT?

SHOW 9 AS: 9.0

HP-IB:

3

SHOW 9 AS: 9,0

*

Timebase can be automatically calibrated only if the timebase option is installed.

Assembly-Level Service Guide

6-9

Chapter 6 Backdating
The HP 53131A Calibration Procedures

6

CHANGE 1 (Firmware Revisions 3317, 3335, 3402, 3427)
(Continued)

The HP 53131A Calibration Procedures
To Calibrate the Offset for Channels 1 and 2
1

To access the Utility menu, power down, and press and hold the
Recall (Utility) key, then press POWER key.

2

Press Recall (Utility) key until CAL: OFFS 1 ? is displayed.

3

Press Enter key.
The display will ask you to remove any signals connected to Channel 1.
Follow the instruction.

4

Press Enter key.
The Counter momentarily displays CALIBRATING, and then it should
display OFFS 1 PASS.
If the fail message is displayed, refer to the troubleshooting section in this
chapter.

5

To calibrate Channel 2, press any one of the arrow keys until
CAL: OFFS 2 ? is displayed.

6

Press Enter key.
The display will ask you to remove any signals connected to Channel 2.
Follow the instruction.

7

Press Enter key.
The Counter momentarily displays CALIBRATING, and then it should
display OFFS 2 PASS.
If the fail message is displayed, refer to the troubleshooting section in this
chapter.

6-10

Assembly-Level Service Guide

Chapter 6 Backdating
The HP 53131A Calibration Procedures

This completes the Offset Calibration procedure. Proceed to the next
procedure to calibrate the gain.

6

CHANGE 1 (Firmware Revisions 3317, 3335, 3402, 3427)
(Continued)

To Calibrate the Gain for Channels 1 and 2
1

Press any one of the arrow keys until CAL: GAIN 1 ? is displayed.

2

Press Enter key.
A scrolling message is displayed. Follow the instruction by performing the
following steps.

3

Connect a BNC tee connector to Channel 1 of the Counter.

4

Connect the Counter, dc power supply, and multimeter as shown
in Figure 2-1.

DC Power Supply

HP 53131A
Counter

Digital Multimeter

+ - -

BNC Tee

Figure 2-1. Gain Calibration Setup
5

Adjust the power supply until the multimeter displays
+ 5.000 V ± 0.001 V.

6

Disconnect the digital multimeter from the Counter to prevent
noise from being introduced into the measurement.

7

Press Enter key.
The Counter momentarily displays CALIBRATING, and then it should
display GAIN 1 PASS.
Assembly-Level Service Guide

6-11

Chapter 6 Backdating
The HP 53131A Calibration Procedures

If the fail message is displayed, refer to the troubleshooting section in this
chapter.

6

CHANGE 1 (Firmware Revisions 3317, 3335, 3402, 3427)
(Continued)
8

To calibrate the gain for Channel 2, connect the input or the
BNC Tee to Channel 2 of the Counter.

9

Press any one of the arrow keys until CAL: GAIN 2 ? is displayed.

10

Press Enter key.
A scrolling message is displayed. (The +5V dc supply should already be
connected to Channel 2 as you were previously instructed to do this in
step 8.)

11

Press Enter key again.
The Counter momentarily displays CALIBRATING, and then it should
display GAIN 2 PASS.
If the fail message is displayed, refer to the troubleshooting section in this
chapter.

12

Disconnect the calibration setup.
This completes the Gain Calibration procedure. Proceed to the next
procedure to calibrate the time interval.

To Calibrate Time Interval
1

Press any one of the arrow keys until CAL: TI Å 2? is displayed.

2

Press Enter key.
A scrolling message with instructions appears. Follow the instruction by
performing the following procedure.

6-12

Assembly-Level Service Guide

Chapter 6 Backdating
The HP 53131A Calibration Procedures

3

Connect the HP 8130A Pulse Generator output to Channel 1 of the
Counter as shown in Figure 2-3.

6

CHANGE 1 (Firmware Revisions 3317, 3335, 3402, 3427)
(Continued)
Equipment
HP 8130A Pulse Generator (or equivalent)
HP 10503A BNC Cable

HP53131A
Counter

HP 8130A
Pulse Generator

Channel 1

Output

Figure 2-3. TI Calibration Setup
4

Set the HP 8130A as follows:
PERIOD: 100 ns
WIDTH: 50 ns
High: 0.50 VLow : −0.50 V
Input Mode: Normal
Any external timebase connected to the Counter is ignored during this
calibration.

NOTE

5

Press Enter key.
The Counter displays CALIBRATING, and then it should display
TI CAL PASS.
If the fail message is displayed, refer to the troubleshooting section in this
chapter.
Assembly-Level Service Guide

6-13

Chapter 6 Backdating
The HP 53131A Calibration Procedures

CHANGE 1 (Firmware Revisions 3317, 3335, 3402, 3427)
(Continued)
Disconnect the calibration setup.

6

6

This completes the TI QUIK? calibration procedures.
Depending on which timebase the Counter contains, proceed to the
following procedure “To Calibrate the Standard Timebase” or the
“To Calibrate the High Stability Timebase Option (Medium or High)”
procedure to calibrate the timebase.

To Calibrate the Standard Timebase
1

Connect the output of a 10 MHz house standard to Channel 1 of
the Counter as shown in Figure 2-4.

HP 53131A
Counter

House Standard
10 MHz Reference

Channel 1

Figure 2-4. Standard Timebase Calibration Setup
2

Cycle the POWER key to preset the Counter.

3

With an insulated tuning tool, turn the OSC Adjust potentiometer
(located on the rear chassis of the Counter) until the frequency
reading in the Counter display is 10.00000000 MHz ± 5 Hz.
The Counter will be calibrated to the house standard.
If you are not able to adjust the frequency correctly, refer to the
troubleshooting section in this chapter.
This completes the Standard Timebase Calibration procedure.
6-14

Assembly-Level Service Guide

Chapter 6 Backdating
The HP 53131A Calibration Procedures

CHANGE 1 (Firmware Revisions 3317, 3335, 3402, 3427)
(Continued)

6

To Calibrate the High Stability Timebase Option
(Medium or High)
Allow the Counter to warm up for approximately 30 minutes
before performing this calibration. This calibration is unlikely to fail,
unless the Counter is not warmed up.

NOTE

1

Connect the output of a 10 MHz house standard to Channel 1 of
the Counter as shown in Figure 2-4.

2

Press any one of the arrow keys until CAL: TIMEBAS? is
displayed.
Note that the timebase choice (CAL: TIMEBAS?) only appears when the
Timebase Option is installed.

3

Press Enter key and follow the instructions in the scrolling
message that appears in the Counter display.

4

Press Enter key after each instruction.
The Counter displays CALIBRATING, and then it should display
TB CAL PASS.
If the fail message is displayed (even after the Counter has been warmed
up for 30 minutes), refer to the troubleshooting section in this chapter.
This completes the High Stability Timebase Option Calibration procedure.
If all tests passed, the Counter is now calibrated.

Assembly-Level Service Guide

6-15

Chapter 6 Backdating
Backdating Specifications

6

Backdating Specifications
CHANGE 1 (53131A, Serial Prefix 3710A and Below)
Page 7-3, External Arm Input Specifications:
Change the Signal Input Range specification
from:
TTL Compatible
to:
High-Level Input: >3.0 V
Low-Level Input: <1.5 V

CHANGE 2 (53132A, Serial Prefix 3546A and Below)
Page 7-3, External Arm Input Specifications:
Change the Signal Input Range specification
from:
TTL Compatible
to:
High-Level Input: >3.0 V
Low-Level Input: <1.5 V

6-16

Assembly-Level Service Guide

Chapter 6 Backdating
Backdating Specifications

CHANGE 3 (53181A, Serial Prefix 3711A02841 and Below)
Page 8-3, External Arm Input Specifications:

6

Change the Signal Input Range specification
from:
TTL Compatible
to:
High-Level Input: >3.0 V
Low-Level Input: <1.5 V

Assembly-Level Service Guide

6-17

Chapter 6 Backdating

6

Backdating Specifications

6-18

Assembly-Level Service Guide

7

HP 53131A/132A Specifications

Chapter 7 HP 53131A/132A Specifications
Introduction

Introduction
The specifications of the HP 53131A/132A Universal Counter are provided
in this chapter.

Instrument Inputs
Channel 1 & 2 Input Specifications1

7

Frequency Range
DC Coupled:
AC Coupled:

DC to 225 MHz
1 MHz to 225 MHz (50 Ω)
30 Hz to 225 MHz (1 MΩ)
FM Tolerance:
25%
Voltage Range and Sensitivity (Sinusoid)2
DC to 100 MHz: 20 mVrms to ±5 V ac + dc
(75 mVrms with optional rear connectors)3
100 MHz to 200 MHz: 30 mVrms to ±5 V ac + dc
(75 mVrms with optional rear connectors)3
200 MHz to 225 MHz: 40 mVrms to ±5 V ac + dc
(75 mVrms with optional rear connectors)3
Voltage Range and Sensitivity (Single-Shot Pulse)2
4.5 ns to 10 ns Pulse Width: 100 mVpp to 10 Vpp
(150 mVpp with optional rear connectors)3
>10 ns Pulse Width: 50 mVpp to 10 Vpp
(100 mVpp with optional rear connectors)3
Trigger Level2
Range:
±5.125 V
Accuracy:
±(15 mV + 1% of trigger level)
Resolution:
5 mV
Damage Level
50 Ω: 5 Vrms
0 to 3.5 kHz, 1 MΩ: 350 V dc + ac pk
3.5 kHz to 100 kHz, 1 MΩ: 350 V dc + ac pk linearly derated to 5 Vrms
>100 kHz, 1 MΩ: 5 Vrms
350 Vdc + acpk

5 Vrms
0 Hz

1
2
3

Channel 1 & 2 Input Characteristics1
Impedance:
1 MΩ Capacitance:
Coupling:
Low-Pass Filter:
Input Sensitivity:

Trigger Slope:
Auto Trigger Level
Range:
Frequency:
Input Amplitude:
Attenuator
Voltage Range:
Trigger Range:

1 MΩ or 50 Ω
30 pF
AC or DC
100 kHz (or disabled)
–20 dB at > 1 MHz
Selectable between
Low, Medium, or High (default).
Low is approximately
2x High Sensitivity.

Positive or Negative
0 to 100% in 10% steps
> 100 Hz
> 100 mVpp
(No amplitude modulation)
x10
x10

1 MΩ

50Ω

3.5 KHz

100 KHz

Specifications and Characteristics for Channels 1 and 2 are identical for both Common and Separate configurations.
Values shown are for X1 attenuator setting. Multiply all values by 10 (nominal) when using the X10 attenuator setting. Note that it may be
necessary to recalibrate the input offset in the application environment (especially at high temperature) to achieve maximum sensitivity.
When ordered with optional rear terminals, the Channel 1 and 2 inputs are active on both the front and rear of the universal counter though the
specifications provided only apply to the rear terminals. Performance for the front terminals is degraded, but may be improved by terminating
the rear terminals into 50 Ω.

7-2

Assembly-Level Service Guide

Chapter 7 HP 53131A/132A Specifications
Instrument Inputs (Continued)

Instrument Inputs (Continued)
Channel 3 Input Specifications4, 5

Channel 3 Input Characteristics
Impedance:
Coupling:
VSWR:

External Arm Input Specifications

External Arm Input Characteristics

Signal Input Range:
TTL compatible
Timing Restrictions:
Pulse Width:
Transition Time:
Start-to-Stop Time:
Damage Level:

Impedance:
Input Capacitance:
Start Slope:
Stop Slope:
> 50 ns
< 250 ns
> 50 ns
10 Vrms

50 Ω
AC
< 2.5:1

7

Frequency Range
Option 030
100 MHz to 3 GHz
Option 050
200MHz to 5 GHz
Option 124
200 MHz to 12.4 GHz
Power Range and Sensitivity (Sinusoid)
Option 030
100 MHz to 2.7 GHz: –27 dBm to +19 dBm
2.7 GHz to 3 GHz:
–21 dBm to +13 dBm
Option 050
200MHz to 5 GHz:
–23 dBm to +13 dBm
Option 124
200 MHz to 12.4 GHz –23 dBm to +13 dBm
Damage Level:
Option 030
5 Vrms
Option 050
+25 dBm
Option 124
+25 dBm

1 kΩ
17 pF
Positive or Negative
Positive or Negative

Notes:
External Arm is available for all measurements except Peak Volts.
External Arm is referred to as External Gate for some
measurements.

4
5

Channel 3 is available as an option.
When ordered with optional rear terminals, the Channel 3 connector on the front panel for Option 030 will be routed to the rear panel (rear
panel only). There is no degradation in specifications for this input. Option 050 and Option 124 input connectors are available on the front
panel only.

.

Assembly-Level Service Guide

7-3

Chapter 7 HP 53131A/132A Specifications
Time Base

Time Base
Internal Time Base Stability
Standard
(0° to 50°C)
Temperature Stability:
(referenced to 25°C)

7

Aging Rate
(after 30 days)

Per Day:
Per Month:
Per Year:

High Stability Oven
(Option 010)

Ultra High Stability
Oven (Option 012)

< 5 x 10–6

< 2 x 10–7

< 2.5 x 10–9

< 2.5 x 10–9

3 x 10–7

< 4 x 10–8
< 2 x 10–7

< 5 x 10–10
< 1.5 x 10–8

< 1 x 10–10
< 3 x 10–9
< 2 x 10–8

<

Turn-on stability vs. time:
(in 30 minutes)
Calibration:

Medium Stability
Oven (Option 001)

Manual Adjust

< 2 x 10–7
(referenced to 2 hours)

< 5 x 10–9
(referenced to 24 hours)

< 5 x 10–9
(referenced to 24 hours)

Electronic

Electronic

Electronic

Note that power to the time base is maintained when the counter is placed in standby via the front panel switch. The internal fan will continue to
operate under this condition, to maintain long-term instrument reliability.

External Time Base Input Specifications
Voltage Range:
Damage Level:

200 mVrms to 10 Vrms
10 Vrms

External Time Base Input Characteristics
Threshold:
Impedance:
Input Capacitance:
Frequency (53131A):

0V
1 kΩ
23 pF
1 MHz, 5 MHz or 10 MHz
(automatic selection)
Frequency (53132A): 10 MHz
Internal vs. External Time Base Selection:
Manual:
Select Internal or External
Automatic: Internal used when External not present
(default)

Time Base Output Specifications
Output Frequency:
Voltage:

10 MHz
> 1 Vpp into 50 Ω
(centered around 0 V)

7-4

Assembly-Level Service Guide

Chapter 7 HP 53131A/132A Specifications
Measurement Specifications

Measurement Specifications
Frequency, Period
Channel 1 and 2 Range: 0.1 Hz to 225 MHz

4.44 ns to 10 s

Channel 3 Range:
Option 030
100 MHz to 3 GHz
0.33 ns to 10 ns
Option 050
200 MHz to 5 GHz
0.2 ns to 5 ns
Option 124
200 MHz to 12.4 GHz 80 ps to 5 ns
(Period 2 or 3 selectable only via the HP-IB interface)
For Automatic or External Arming:

For Time or Digits Arming:

(and signals < 100 Hz using Timed Arming)

7

LSD Displayed:

LSD Displayed:


2 2 × t re s
t jitter  Frequency
or
 ------------------------------------------------------------------------------------------- + ---------------------------- ×
 Gate Time × Number or Samples Gate Time
Period

Frequency
t res
 ---------------------------
or
 Gate Time ×
Period

RMS Resolution:

RMS Resolution:
2

2

 4 × t res + 2 × Trigger Error
t jitte r  Frequency
or
 ------------------------------------------------------------------------------------------- + ---------------------------- x
 Gate Time × Number or Samples Gate Time
Period

 t res + ( 2 × Trigger Error ) Frequency
or
 ---------------------------------------------------------------------- ×
Gate Time


Period

HP 53131A
tres

2

2

HP 53131A
tres
tjitter

HP 53132A
tres

HP 53132A
tres
tjitter

typical
650 ps
200 ps
see graphs for worst case resolution performance

typical 500 ps
50 ps
225 ps
3 ps
see graphs for worst case resolution performance

N
For Automatic Arming: Gate Time = ---------------------------

Number of Samples =
Gate Time x Frequency
Gate Time x 200,000

Frequency

where N = 1 for Ch1 or Ch2 Frequency < 1 MHz
4 for Ch1 or Ch2 Frequency > 1 MHz
128 for Ch3
t a cc 
Systematic Uncertainty:  ± Time Base Error ± ---------------------×

Gate Time

HP 53131A
tacc

Frequency
or
Period

t a cc 
Systematic Uncertainty:  ± Time Base Error ± ---------------------×

Gate Time

HP 53132A
tacc

typical
350 ps
100 ps
worst case
1.25 ns
500 ps
Trigger: Default setting is Auto Trigger at 50%

(Frequency < 200 kHz)
(Frequency > 200 kHz)

HP 53131A
tacc

Frequency
or
Period

HP 53132A
tacc

typical
100 ps
10 ps
worst case
300 ps
100 ps
Trigger: Default setting is Auto Trigger at 50%

The following graphs may also be used to compute errors for Period Measurements. To find the Period error (∆P), calculate the frequency of the
F-
-----input signal ( F = ---1- ) and find the frequency error (∆F) from the chart. Then, calculate the period error as: ∆P =  ∆
 ×P
F

P

Assembly-Level Service Guide

7-5

Chapter 7 HP 53131A/132A Specifications
Measurement Specifications (Continued)

Measurement Specifications (Continued)
HP 53131A—Worst Case RMS Resolution
Automatic or External Arming:

1E+02
Auto Armed
1ms

7

Frequency Error (Hz)

1E+00

10ms
100ms

1E-2

1s
1E-4
10s
1E-6
Gate
Time

1E-8

1E-10
10

100

1000

10000 100000 1000000 1E+07

1E+08 1E+09 1E+10

Input Frequency (Hz)

Time or Digit Arming:

1E+02

Frequency Error (Hz)

1E+00
1ms
1E-2

10ms
100ms

1E-4

1s
1E-6
10s
1E-8

1E-10
10

Gate
Time
100

1000 10000 100000 1000000 1E+07 1E+08 1E+09 1E+10

Input Frequency

The preceding graphs do not reflect the effects of trigger error. To place an upper bound on the added effect of this error term, determine the
frequency error from the appropriate graph and add a trigger error term as follows:
Automatic or External Arming
Frequency
2 × Trigger Error
Frequency Error +  ----------------------------------------------- ×
or
Gate Time
Period

7-6

Time or Digit Arming
4 × 2 × Trigger Error
Frequency Error +  ------------------------------------------------------------------------------------------- ×
Gate Time × Number of Samples

Frequency
or
Period

Assembly-Level Service Guide

Chapter 7 HP 53131A/132A Specifications
Measurement Specifications (Continued)

Measurement Specifications (Continued)
HP 53132A—Worst Case RMS Resolution
Automatic or External Arming:

1E+00

1ms

Auto Armed

10ms

1E-2

100ms
1s

1E-4

7

Frequency Error (Hz)

1E+02

10s
1E-6
Gate
Time
1E-8
1E-10
10

100

1000

10000

100000

1000000

1E+07

1E+08

1E+09

1E+10

1E+07

1E+08

1E+09

1E+10

Input Frequency (Hz)

Time or Digit Arming:

Frequency Error (Hz)

1E+02
1E+00
1ms
1E-2
10ms
1E-4
100ms
1E-6

1s

1E-8

10s

Gate
Time

1E-10
10

100

1000

10000

100000

1000000

Input Frequency (Hz)

The preceding graphs do not reflect the effects of trigger error. To place an upper bound on the added effect of this error term, determine the
frequency error from the appropriate graph and add a trigger error term as follows:
Time or Digit Arming
4 × 2 × Trigger Error
Frequency Error +  -------------------------------------------------------------------------------------------
Gate Time × Number of Samples

Automatic or External Arming
Frequency
×
or
Period

Assembly-Level Service Guide

2 × Trigger Error
Frequency Error +  ----------------------------------------------- ×
Gate Time

Frequency
or
Period

7-7

Chapter 7 HP 53131A/132A Specifications
Measurement Specifications (Continued)

Measurement Specifications (Continued)
Frequency Measurement Example:
Given an HP 53132A with a High Stability Oven that was calibrated 3 days ago, measure a 15 MHz square wave signal (which has negligible
trigger error) with a 1 second gate time. Compute the measurement error to within 2-sigma confidence.
Measurement Error = Systematic Uncertainty ± 2 × RMS Resolution
2

2


 4 × t res + ( 2 × Trigger Error )
t acc
t jitter  
-  × Frequency
- + --------------------------=   ± Time Base Error ± ---------------------------- ± 2 ×  -----------------------------------------------------------------------------------------Gate Time

 Gate Time × Number of Samples Gate Time 

7

Number of Samples = 200,000 since Frequency is greater than 200kHz and gate time equals 1 second
Time Base Error = Temperature Stability + 3 Days × Daily Aging Rate
= 2.5 × 10

–9

= 4.0 × 10

–9

+ 3 × ( 5 × 10

– 10

)

– 11

 4 × ( 225 × 10 –12 s ) 2 + ( 2 × 0 ) 3 × 10 – 12 s 
1 × 10 s
–9
Measurement Error =   ± 4.0 × 10 ± --------------------------- ± 2 ×  ------------------------------------------------------------------------------- + ---------------------------  × 15MHz


1s
1s
1s × 200, 000




= ( ± 4.0 × 10

–9
–9

± 2 × ( 2.01 × 10

= ( ± 4.0 × 10 ± 1 × 10
= ± 60.2 mHz

– 11

– 12

+ 3 × 10

– 12

) ) × 15MHz

) × 15MHz

Which is to say that the HP 53132A would display results in the range 15 MHz ±60.2 mHz. Note however that the dominant error is the Time
Base Error. If an even higher stability time base is available or if the instrument can be source locked to the 15 MHz signal, then this error term
can be substantially reduced. The measurement resolution under these conditions is ±75 µHz (1 sigma) which determines the number of digits
displayed.

7-8

Assembly-Level Service Guide

Chapter 7 HP 53131A/132A Specifications
Measurement Specifications (Continued)

Measurement Specifications (Continued)
Time Interval
Measurement is specified over the full signal ranges7 of Channels 1 and 2.
Results Range:

–1 ns to 105 s

LSD:

53131A
53132A
-------------------------------------------------------------------------------------------500 ps
150 ps
2

2

RMS Resolution:

t re s + Start Trigger Error + Stop Trigger Error

2

53131A
53132A------------------------------------------------------------------------------------------750 ps
300 ps

tres

Frequency Ratio:

Ch1

⁄

Ch2

Ch1

⁄

⁄

Ch2

Ch3

Ch1

Ch3

7

Systematic Uncertainty: ±(Time Base Error × TI) ± Trigger Level Timing Error ± 1.5 ns Differential Channel Error (HP 53131A)
± 900 ps Differential Channel Error (HP 53132A)
Time Interval Delay
After a Time Interval Measurement has begun by satisfying the trigger conditions on Channel 1, the instrument will wait for the
user-entered delay time to elapse before the end-of-measurement trigger will be accepted on Channel 2. Please refer to Measurement
Arming for additional information.

⁄

Ch1

Measurement is specified over the full signal range of each input.
Results Range:
10–10 to 1011
‘Auto’ Gate Time:
100 ms (or sufficient cycles on Channel 2 or 3 to make a valid measurement, whichever is longer)
LSD:
1
Ratio 1⁄2 : ----------------------------------------------------------Ch2 Freq × Gate Time

1
Ratio 1⁄3 : ----------------------------------------------------------Ch3 Freq × Gate Time

Ch2 Freq
Ratio 2⁄1 : -----------------------------------------------------------------2
( Ch1 Freq ) × Gate Time

Ch3 Freq
Ratio 3⁄1 : -----------------------------------------------------------------2
( Ch1 Freq ) × Gate Time

RMS Resolution:
2

2

2 × 1 + ( Ch1 Freq × Ch2 Trigger Error )
Ratio 1⁄2 : ------------------------------------------------------------------------------------------------------------Ch2 Freq × Gate Time

2 × 1 + ( Ch1 Freq × Ch3 Trigger Error )
Ratio 1⁄3 : ------------------------------------------------------------------------------------------------------------Ch3 Freq × Gate Time
2

2 × Ch2 Freq × 1 + ( Ch1 Freq × Ch2 Trigger Error ) Ratio 2⁄1 : ------------------------------------------------------------------------------------------------------------------------------------------2
( Ch1 Freq ) × Gate Time

2

2 × Ch3 Freq × 1 + ( Ch1 Freq × Ch3 Trigger Error ) Ratio 3⁄1 : ------------------------------------------------------------------------------------------------------------------------------------------2
( Ch1 Freq ) × Gate Time

To minimize relative phase measurement error, connect the higher frequency signal to Channel 1 when possible.
7

See Specifications for Pulse Width and Rise/Fall Time measurements for additional restrictions on signal timing characteristics.

Assembly-Level Service Guide

7-9

Chapter 7 HP 53131A/132A Specifications
Measurement Specifications (Continued)

Measurement Specifications (Continued)
Pulse Width
Measurement is specified over the full signal range of Channel 1. The width of the opposing pulse must be greater than 4 ns (e.g., when
measuring the positive pulse width, the negative pulse width must be greater than 4 ns).
Pulse Selection:
Positive or Negative
Trigger:
Default setting is Auto Trigger8 at 50%
Results Range:
5 ns to 105 s
53131A
53132A------------------------------------------------------------------------------------------500 ps
150 ps

LSD:
RMS Resolution:

2

2

t re s + Start Trigger Error + Stop Trigger Error
53131A

2

53132A

7

-------------------------------------------------------------------------------------------tres
750 ps
300 ps
Systematic Uncertainty:
± (Time Base Error × Pulse Width) ± Trigger Level Timing Error ±1.5 ns Differential Channel Error (HP 53131A)
± 900 ps Differential Channel Error (HP 53132A)

Rise/Fall Time
Measurement is specified over the full signal ranges of Channel 1. The interval between the end of one edge and start of a similar edge
must be greater than 4 ns. (e.g., when measuring a rising edge, 4 ns must elapse between the 90% point of one rising edge and the
10% point of the next rising edge).
Edge Selection:
Positive or Negative
Trigger:
Default setting is Auto Trigger8 at 10% and 90%
Results Range:
5 ns to 105 s
53131A
53132A
-------------------------------------------------------------------------------------------500 ps
150 ps

LSD:
RMS Resolution:

2

2

t re s + Start Trigger Error + Stop Trigger Error
53131A

2

53132A

-------------------------------------------------------------------------------------------tres
750 ps
300 ps
Systematic Uncertainty:
± (Time Base Error × Transition Time) ± Trigger Level Timing Error ±1.5 ns Differential Channel Error (HP 53131A)
± 900 ps Differential Channel Error (HP 53132A)

Phase
Measurement is specified over the full signal range of Channels 1 and 2.
Results Range:
–180° to +360°
RMS Resolution:
tres
Systematic Uncertainty:
8

Phase 2
2
2
( t res + ( 2 × Trigger Error ) ) ×  1 +  -----------------  × Frequency × 360 °
 360 °  

53131A
53132A------------------------------------------------------------------------------------------750 ps
300 ps

(± Trigger Level Timing Error ± 1.5 ns Differential Channel Error) × Frequency (HP 53131A)
(± Trigger Level Timing Error ± 900 ps Differential Channel Error) × Frequency (HP 53132A)

Restrictions noted on page 7-2 for Auto Trigger apply to the proper operation of these measurements. The Peak Volts measurement is used to
determine the signal amplitude and inaccuracies from this, noted on page 7-11, should be included in calculating the Trigger Level Timing Error.

7-10

Assembly-Level Service Guide

Chapter 7 HP 53131A/132A Specifications
Measurement Specifications (Continued)

Measurement Specifications (Continued)
Duty Cycle
Measurement is specified over the full signal range of Channel 1. However, both the positive and negative pulse widths must be greater
than 4 ns.
Results Range:
0 to 1 (e.g. 50% duty cycle would be displayed as .5)
RMS Resolution:
tres

2

2

2

( t res + ( 2 × Trigger Error ) ) × ( 1 + Duty Cycle ) × Frequency
53131A
53132A
-------------------------------------------------------------------------------------------750 ps
300 ps

Totalize

7

Measurement is specified over the full signal range of Channel 1.
Results Range:
0 to 1015
Resolution:
± 1 count

Peak Volts
Measurement is specified on Channels 1 and 2 for DC signals; or for AC signals of frequencies between 100 Hz and 30 MHz with peak-topeak amplitude greater than 100 mV. (The measurement will continue to operate up to 225 MHz, though results are for indication only.)
Results Range:
–5.1 V to +5.1 V
Resolution:
10 mV
Systematic Uncertainty for AC signals: 25 mV + 10% of V
for DC signals: 25 mV + 2% of V
Use of the input attenuator multiplies all voltage specifications (input range, results range, resolution and systematic uncertainty) by a
nominal factor of 10. For example with AC signals, the Systematic Uncertainty becomes: 250 mV + 10% of V.

Assembly-Level Service Guide

7-11

Chapter 7 HP 53131A/132A Specifications
Measurement Definitions

Measurement Definitions
Definitions of Systematic Uncertainty Terms
•

Trigger Error
External source and input amplifier noise may advance or delay the trigger points that define the beginning and end of a measurement.
The resulting timing uncertainty is a function of the slew rate of the signal and the amplitude of spurious noise spikes (relative to the input
hysteresis band).
The (rms) trigger error associated with a single trigger point is:
2

2

( E in put ) + ( E signa l )
Trigger Error = ------------------------------------------------------------------------------------------------------- (in seconds)
Input Signal Slew Rate at Trigger Point

where

7

Einput = RMS noise of the input amplifier: 1 mVrms (350 µVrms typical). Note that the internal measurement algorithms significantly
reduce the contribution of this term.
Esignal = RMS noise of the input signal over a 225 MHz bandwidth (100 kHz bandwidth when the low-pass filter is enabled). Note that
the filter may substantially degrade the signal’s slew rate at the input of the trigger comparator.
For two-trigger-point measurements (e.g. Rise Time, Pulse Width), the Trigger Errors will be referred to independently as Start Trigger Error
and Stop Trigger Error.

•

Trigger Level Timing Error
Trigger level timing error results from a deviation of the actual trigger level from the specified (indicated) level. The magnitude of the
measurement timing error depends on several factors, primarily: resolution and accuracy of the trigger level circuit, fidelity of the input
amplifier, slew rate of the input signal at the trigger point, and width of the input hysteresis band (see illustration).
Actual Trigger Point:
Slope
Upper Hystersis Limit
0.5

Hysteresis Band

0.5

Hysteresis Band

Trigger Level Setting
Lower Hystersis Limit
Amplitude
Time

Actual Trigger Point:
Slope

Trigger Level Timing Errors
Trigger level timing error is associated with Time Interval, Pulse Width, Rise Time, Fall Time, Phase, and Duty Cycle measurements.
The following equations define the general interpretation of its component error terms for a measurement. These should be summed
together to obtain the overall Trigger Level Timing Error.
0.5 × Hysteresis Band
0.5 × Hysteresis Band
Input Hysteresis: --------------------------------------------------------------------------------------------------------------------- – --------------------------------------------------------------------------------------------------------------------Input Signal Slew Rate at Start Trigger Point Input Signal Slew Rate at Stop Trigger Point
15 mV ± ( 1% × Stop Trigger Level Setting )
15 mV ± ( 1% × Start Trigger Level Setting )
Trigger Level Setting: ± --------------------------------------------------------------------------------------------------------------------- ± --------------------------------------------------------------------------------------------------------------------Input Signal Slew Rate at Start Trigger Point Input Signal Slew Rate at Stop Trigger Point

7-12

Assembly-Level Service Guide

Chapter 7 HP 53131A/132A Specifications
Measurement Definitions (Continued)

Measurement Definitions (Continued)
•

Fractional Time Base Error
Time base error is the maximum fractional frequency variation of the time base due to aging or fluctuations in ambient temperature or line
voltage:
∆f
Time Base Error =  ---- f

•

aging rate

∆f
+ ----f

temperature

∆f
+ ----f



line voltage

Multiply this quantity by the measurement result to yield the absolute error for that measurement. Averaging measurements will not reduce
(fractional) time base error. The HP 53131A/132A universal counters exhibit negligible sensitivity to line voltage; consequently this term
may be ignored.
Differential Channel Error

Typical Versus Worst Case Specifications
Specifications identified as “Typical” represent performance of the instrument that the majority of users will perceive under a wide variety of
conditions and signals. The specifications identified as “Worst Case” should be used when the instrument is under extreme environmental
conditions or when the accuracy of the measurement results are critically important.

Time Interval Measurement LSD Definition
For the Time Interval, Pulse Width, and Rise/Fall Time measurements, the LSD is the measurement quantization error. “ tres” is the LSD
plus the effects of certain internal error producing sources.

Additional Considerations for Digits and Time Arming Modes
For sample rates defined below, resolution will be reduced by up to 1 decade. The instruments display detects this condition and displays a
reduced-resolution result. Resolution is reduced in a band about f s, such that
10MHz
x.y = ------------------fs

where x is any integer, and y is any fraction in the set:

⁄

⁄

⁄

⁄

⁄

⁄

⁄

⁄

⁄

⁄


 1
1
2
1
2
3
1
2
3
4
 0, 2 , 3 , 3 , 4 , 4 , 4 , 5 , 5 , 5 , 5 , ... 



The width of the band is at most:

For Example:
10MHz
25.25 = ---------------------------396, 039.6
x = 25
y = 0.25 =

1

⁄4

–7

6 × 10 × f input
± -------------------------------------Gate Time

The value of fs is not available to the user, but the instrument can be queried over HP-IB to determine if this condition exists.
After the measurement completes, use the query :DIAGnostic:MEASure:PRESolution? The response is an ASCII text formatted string “Ø”
for normal resolution and “1” for reduced resolution. This command is valid only when making frequency measurements in time or digits
arming and the input frequency is greater than 100 Hz.

Assembly-Level Service Guide

7-13

7

The Differential Channel Error term included in many of the Systematic Uncertainty equations accounts for channel-to-channel mismatch
and internal noise. This error can be substantially reduced by performing the TI Calibration in the temperature environment in which future
measurements are to be made and by careful measurement technique. Calibration is accessible via the Calibration Menu during power-up.

Chapter 7 HP 53131A/132A Specifications
Measurement Arming and Processing

Measurement Arming and Processing
Gate Time

Measurement Throughput

Auto Mode, or 1 ms to 1000 s

HP-IB ASCII:
200 Measurements/s (maximum)
(See examples in the Programming Guide for ways to optimize
measurement throughput)

7

Measurement Arming
Start Measurement:
Free Run, Manual, or External
Stop Measurement:
Continuous, Single, External, or Timed
Arming Modes:
(Note that not all arming modes are available for every measurement function.)
Auto Arming:
Measurements are initiated immediately and acquired as fast as possible, using a minimum number of signal
edges. Auto arming offers the highest measurement throughput, though measurement resolution may be
reduced.
Timed Arming:
The duration of the measurement is internally timed to a user-specified value (also known as the “gate time”).
This mode should be used when the length of the measurement time must be controlled.
Digits Arming:
Measurements are performed to the requested resolution (number of digits) through automatic selection of the
acquisition time. This is the most convenient mode for when a specific measurement resolution is desired.
External Arming:
An edge on the External Arm Input enables the start of each measurement. Depending on the measurement
function, Auto Arming, Timed arming modes or another edge on the External Arm Input may be used to complete
the measurement.
Time Interval
Arming Modes:
HP 53131A
Time Interval Stop Delay Arming: The Stop Measurement condition on Channel 2 is inhibited (trigger hold-off) for
a user specified time following the Start Measurement on Channel 1.
Time Interval Delay Range:
100 µs to 10 s*
Time Interval Delay Resolution:
10 µs from 100 µs to 100 ms
1 ms from 100 ms to 10 s
HP 53132A
Time Interval Start Delay Arming: The start of a Time Interval measurement is delayed for a user-specified
amount of time, or number of Channel 2 events, from the Start External Arming edge.
Start Delay TimeRange:
100 ns to 999.9999 ms
Start Delay Time Resolution:
100 ns
Start Delay Event Range:
1 to 99,999,999 Channel 2 events
Start Delay Event Rate:
5 MHz maximum
Start Delay Event Setup Time:
30 ns minimum
Time Interval Stop Delay Arming: The Stop Measurement condition on Channel 2 is inhibited (trigger hold-off) for
a user-specified amount of time, or number of Channel 2 stop events, following the Start Measurement on
Channel 1, or, if enabled, the Stop External Arming edge.
Stop Delay Time Range:
100 ns to 10 s**
Stop Delay Time Resolution:
100 ns from 100 ns to 1 s
1 ms from 1 s to 10 s
Stop Delay Event Range:
1 to 99,999,999 Channel 2 events
Stop Delay Event Rate:
5 MHz maximum
Stop Delay Event Setup Time:
30 ns minimum
* For firmware revisions below 3427 the valid range of delay is 1 ms to 10 s.
** For firmware revisions below 3646 the valid range of delay is 1 ms to 10 s.

7-14

Assembly-Level Service Guide

Chapter 7 HP 53131A/132A Specifications
Measurement Arming and Processing (Continued)

Measurement Arming and Processing (Continued)
Measurement Statistics
Available Statistics:
Mean, Minimum, Maximum, Standard Deviation
Number of Measurements: 2 to 1,000,000. Statistics may be collected on all measurements or on only those which are between the limit
bands. When the Limits function is used in conjunction with Statistics, N (number of measurements) refers to the
number of in-limit measurements. In general, measurement resolution will improve in proportion to N , up to the
numerical processing limits of the instrument.
Measurements:
Statistics may be collected for all measurements except Peak Volts and Totalize.

Measurement Limits

Out-of-Limits Indication:

The measurement value is checked against user-specified limits at the end of each measurement.
The measurement result may be displayed as either the traditional numeric value or graphically as an asterisk
moving between two vertical bars. These bars define the upper and lower limits, and the asterisk represents the
current measurement result relative to these limits.
The out-of-limits condition can be indicated by any of the following methods:
• The limits annunciator will light on the front panel display.
• The instrument will generate an SRQ if enabled via HP-IB.
• The limits hardware signal provided via the RS-232 connector will go low for the duration of the out-of-limit
condition (see the description of this connector under the General Information section of this specifications
table).
• If the Analog Display mode is enabled, the asterisk appears outside the vertical bars, which define the upper
and lower limits.

Assembly-Level Service Guide

7-15

7

Limit Checking:
Display Modes:

Chapter 7 HP 53131A/132A Specifications
General Information

General Information
Save and Recall:

Up to 20 complete instrument setups may be saved and recalled later. These setups are retained when
power is removed from the universal counter.
88.5 mm x 212.6 mm x 348.3 mm
3.5 kg maximum
AC Line Supply
DC Supply (Option 002 Only)

Rack Dimensions (HxWxD):
Weight:
Power Supply Voltage:

100 to 120 VAC ±10% - 50, 60 or 400 Hz ±10%
220 to 240 VAC ±10% - 50 or 60 Hz ±10%
AC Line Voltage Selection: Automatic
170 VA maximum (30 W typical)

7

Power Requirements:
Operating Environment:
Storage Environment:
Remote Interface:
HP-IB Interface Capabilities:
Remote Programming Language:
Safety:
EMC:

RS-232C:

Note on Pin 4:

10 to 32 VDC, 3-pin male XLR connector
Option 002 may not be ordered with Option 060
4A initial inrush at 10 VDC
3A max, once stabilized

0° C to 55° C
–40° C to 71° C
HP-IB (IEEE 488.1-1987, IEEE 488.2-1987)
SH1, AH1, T5, TE0, L4, LE0, SR1, RL1, PP0, DC1, DT1, C0, E2
SCPI-1992.0 (Standard Commands for Programmable Instruments)
Designed in compliance with IEC 1010-1, UL 3111-1 (draft), CAN/CSA 1010.1
CISPR-11, EN50082-1, IEC 801-2, -3, -4
Electrostatic Discharge and Fast Transient/Burst Immunity Testing: When the product is operated at
maximum sensitivity (20 mVrms) and tested with 8kV AD according to IEC801-2 or with 1kV power line
transients according to IEC 801-4, frequency miscounts may occur that will affect measurement data
made during these disturbances.
Radiated Immunity Testing: When the product is operated at maximum sensitivity (20 mVrms) and tested
at 3 V/m according to IEC 801-3, external 100 to 200 MHz electric fields may cause frequency miscounts.
The rear-panel RS-232 connector is a 9-pin connector (DB-9, male). You can connect the universal
counter to any terminal or printer with a properly configured DTE connector (DB-25). You can use a
standard interface cable (HP part number 24542G or 24542H). Data is “output only”; the instrument cannot
be programmed via the RS-232 interface.
May be used as either a DTR signal or an indication of measurement in-limit as configured by the Utility menu.
When used as an in-limit indicator, the signal will be high for every measurement within the user set limits.

1 2 3 4 5

6 7 8 9

Pin Number

Type

2

Input

3

Output

Transmit Data (TxD)

4

Output

Data Terminal Ready (DTR)
Measurement In-Limit Signal

5

—

6

Input

*

7-16

Description
Receive Data (RxD) (for Xon/Xoff only)

Signal Ground
Data Set Ready (DSR)

All other pins: no connection

Assembly-Level Service Guide

8

HP 53181A Specifications

Chapter 8 HP 53181A Specifications
Introduction

Introduction
The specifications of the HP 53181A Frequency Counter are provided in
this chapter.

Instrument Inputs
Channel 1 Input Specifications

8

Frequency Range
DC Coupled:
AC Coupled:

DC to 225 MHz
1 MHz to 225 MHz (50 Ω)
30 Hz to 225 MHz (1 MΩ)
FM Tolerance:
25%
Voltage Range and Sensitivity (Sinusoid)1
DC to 100 MHz: 20 mVrms to ±5 V ac + dc
(75 mVrms with optional rear connectors)2
100 MHz to 200 MHz: 30 mVrms to ±5 V ac + dc
(75 mVrms with optional rear connectors)2
200 MHz to 225 MHz: 40 mVrms to ±5 V ac + dc
(75 mVrms with optional rear connectors)2
Voltage Range and Sensitivity (Single-Shot Pulse)1
4.5 ns to 10 ns Pulse Width: 100 mVpp to 10 Vpp
(150 mVpp with optional rear connectors)2
>10 ns Pulse Width: 50 mVpp to 10 Vpp
(100 mVpp with optional rear connectors)2
Trigger Level2
Range:
±5.125 V
Accuracy:
±(15 mV + 1% of trigger level)
Resolution:
5 mV
Damage Level
50 Ω: 5 Vrms
0 to 3.5 kHz, 1 MΩ: 350 V dc + ac pk
3.5 kHz to 100 kHz, 1 MΩ: 350 V dc + ac pk linearly derated to 5 Vrms
>100 kHz, 1 MΩ: 5 Vrms
350 Vdc + acpk

5 Vrms
0 Hz

1
2

Channel 1 Input Characteristics
Impedance:
1 MΩ Capacitance:
Coupling:
Low-Pass Filter:
Input Sensitivity:

Trigger Slope:
Auto Trigger Level
Range:
Frequency:
Input Amplitude:
Attenuator
Voltage Range:
Trigger Range:

1 MΩ or 50 Ω
30 pF
AC or DC
100 kHz (or disabled)
–20 dB at > 1 MHz
Selectable between
Low, Medium, or High (default).
Low is approximately
2x High Sensitivity.

Positive or Negative
0 to 100% in 10% steps
> 100 Hz
> 100 mVpp
(No amplitude modulation)
x10
x10

1 MΩ

50Ω

3.5 KHz

100 KHz

Values shown are for X1 attenuator setting. Multiply all values by 10 (nominal) when using the X10 attenuator setting. Note that it may be
necessary to recalibrate the input offset in the application environment (especially at high temperature) to achieve maximum sensitivity.
When ordered with optional rear terminals, the Channel 1 input is active on both the front and rear of the counter though the specifications
provided only apply to the rear terminal. Performance for the front terminal is degraded, but may be improved by terminating the rear terminal
into 50 Ω.

8-2

Assembly-Level Service Guide

Chapter 8 HP 53181A Specifications
Instrument Inputs (Continued)

Instrument Inputs (Continued)
Channel 2 Input Specifications3, 4
Frequency Range
Opt. 015
Opt. 030
Opt. 050
Opt. 124

Channel 2 Input Characteristics
Impedance:
Coupling:
VSWR:

100 Mhz to 1.5 Ghz
100 MHz to 3 GHz
200MHz to 5 GHz
200 MHz to 12.4 GHz

50 Ω
AC
< 2.5:1

Power Range and Sensitivity (Sinusoid)
Option 015
100 MHz to 1.5 GHz: –27 dBm to +19 dBm
Option 030
100 MHz to 2.7 GHz: –27 dBm to +19 dBm
2.7 GHz to 3 GHz:
–21 dBm to +13 dBm
Option 050
200MHz to 5 GHz:
–23 dBm to +13 dBm
Option 124
200MHz to 12.4 GHz: –23 dBm to +13 dBm
Damage Level:
Option 015, 030
5 Vrms
Option 050, 124
+25 dBm

External Arm Input Characteristics

Signal Input Range:
TTL compatible
Timing Restrictions:
Pulse Width:
Transition Time:
Start-to-Stop Time:
Damage Level:

Impedance:
Input Capacitance:
Start Slope:
Stop Slope:
> 50 ns
< 250 ns
> 50 ns
10 Vrms

8

External Arm Input Specifications

1 kΩ
17 pF
Positive or Negative
Positive or Negative

Notes:
External Arm available for all measurements except Peak Volts.
External Arm is referred to as External Gate for some
measurements.

3
4

Channel 2 is available as an option.
When ordered with optional rear terminals, the Channel 2 connector on the front panel for Options 015 or 030 will be removed. There is no
degradation in specifications for this input. Option 050 and Option 124 input connectors are available on the front panel only.

Assembly-Level Service Guide

8-3

Chapter 8 HP 53181A Specifications
Time Base

Time Base
Internal Time Base Stability
Standard
(0° to 50°C)
Temperature Stability:
(referenced to 25°C)
Aging Rate
(after 30 days)

Per Day:
Per Month:
Per Year:

High Stability Oven
(Option 010)

Ultra High Stability
Oven (Option 012)

< 5 x 10–6

< 2 x 10–7

< 2.5 x 10–9

< 2.5 x 10–9

–7

< 4 x 10–8
< 2 x 10–7

< 5 x 10–10
< 1.5 x 10–8

< 1 x 10–10
< 3 x 10–9
< 2 x 10–8

< 3 x 10

Turn-on stability vs. time:
(in 30 minutes)
Calibration:

Medium Stability
Oven (Option 001)

Manual Adjust

< 2 x 10–7
(referenced to 2 hours)

< 5 x 10–9
(referenced to 24 hours)

< 5 x 10–9
(referenced to 24 hours)

Electronic

Electronic

Electronic

Note that power to the time base is maintained when the counter is placed in standby via the front panel switch. The internal fan will continue to
operate under this condition, to maintain long-term instrument reliability.

8

External Time Base Input Specifications
Voltage Range:
Damage Level:

200 mVrms to 10 Vrms
10 Vrms

External Time Base Input Characteristics
Threshold:
Impedance:
Input Capacitance:
Frequency:

0V
1 kΩ
23 pF
1 MHz, 5 MHz or 10 MHz
(automatic selection)
Internal vs. External Time Base Selection:
Manual:
Select Internal or External
Automatic: Internal used when External not present
(default)

Time Base Output Specifications
Output Frequency:
Voltage:

10 MHz
> 1 Vpp into 50 Ω
(centered around 0 V)

8-4

Assembly-Level Service Guide

Chapter 8 HP 53181A Specifications
Measurement Specifications

Measurement Specifications
Frequency, Period
Channel 1 Range:

0.1 Hz to 225 MHz

4.44 ns to 10 s

Channel 2 Range:
Option 015
100 Mhz to 1.5 Ghz
Option 030
100 MHz to 3 GHz
Option 050
200 MHz to 5 GHz
Option 124
200 MHz to 12.4 GHz
(Period 2 selectable only via the HP-IB interface)

0.67 ns to 10 ns
0.33 ns to 10 ns
0.2 ns to 5 ns
80 ps to 5 ns

For Automatic or External Arming:

For Time or Digits Arming:

(and signals < 100 Hz using Timed Arming)
LSD Displayed:

LSD Displayed:

2 2 × t re s
t jitter  Frequency
or
 ------------------------------------------------------------------------------------------- + ---------------------------- ×
Gate
Time
 Gate Time × Number or Samples
Period

Frequency
t res
 ---------------------------
or
 Gate Time ×
Period

RMS Resolution:

RMS Resolution:
2

2

 t res + ( 2 × Trigger Error ) Frequency
or
 ---------------------------------------------------------------------- ×
Gate Time


Period

 4 × t res + ( 2 × Trigger Error )
t jitter  Frequency
or
 ------------------------------------------------------------------------------------------- + ---------------------------- ×
 Gate Time × Number or Samples Gate Time
Period
2

tres: 500 ps typical5
tjitter: 50 ps typical5

N
For Automatic Arming: Gate Time = --------------------------Frequency

Number of Samples =
Gate Time x Frequency
Gate Time x 200,000

where N = 1 for Ch1 Frequency < 1 MHz
4 for Ch1 Frequency > 1 MHz
128 for Ch2
t a cc 
Systematic Uncertainty:  ± Time Base Error ± ---------------------×
Gate Time

tacc: 350 ps typical
1.25 ns worst case
Trigger: Default setting is Auto Trigger at 50%

Frequency
or
Period

8

tres: 650 ps typical5

2

(Frequency < 200 kHz)
(Frequency > 200 kHz)

t a cc 
Systematic Uncertainty:  ± Time Base Error ± ---------------------×
Gate Time

Frequency
or
Period

tacc: 100 ps typical
300 ps worst case
Trigger: Default setting is Auto Trigger at 50%

The following graphs may also be used to compute errors for Period Measurements. To find the Period error (∆P), calculate the frequency of the
F-
-----×P
input signal ( F = ---1- ) and find the frequency error (∆F) from the chart. Then, calculate the period error as: ∆P =  ∆

F

P

.

Assembly-Level Service Guide

8-5

Chapter 8 HP 53181A Specifications
Measurement Specifications (Continued)

Measurement Specifications (Continued)
Worst Case RMS Resolution
Automatic or External Arming:
1E+02
Auto Armed
1ms

Frequency Error (Hz)

1E+00

10ms
100ms

1E-2

1s
1E-4
10s
1E-6
Gate
Time

1E-8

1E-10
10

100

1000

10000 100000 1000000 1E+07

1E+08 1E+09 1E+10

Input Frequency (Hz)

8

Time or Digit Arming:

1E+02

Frequency Error (Hz)

1E+00
1ms
1E-2

10ms
100ms

1E-4

1s
1E-6
10s
1E-8
Gate
Time

1E-10
10

100

1000 10000 100000 1000000 1E+07 1E+08 1E+09 1E+10

Input Frequency

The preceding graphs do not reflect the effects of trigger error. To place an upper bound on the added effect of this error term, determine the
frequency error from the appropriate graph and add a trigger error term as follows:
Automatic or External Arming
Frequency
2 × Trigger Error
Frequency Error +  ----------------------------------------------- ×
or
Gate Time
Period

8-6

Time or Digit Arming
4 × 2 × Trigger Error
Frequency Error +  ------------------------------------------------------------------------------------------- ×
Gate Time × Number of Samples

Frequency
or
Period

Assembly-Level Service Guide

Chapter 8 HP 53181A Specifications
Measurement Specifications (Continued)

Measurement Specifications (Continued)
Frequency Measurement Example:
Given an HP 53181A with a High Stability Oven that was calibrated 3 days ago, measure a 15 MHz square wave signal (which has negligible
trigger error) with a 1 second gate time. Compute the measurement error to within 2-sigma confidence.
Measurement Error = Systematic Uncertainty ± 2 × RMS Resolution
2

2

 4 × t res + ( 2 × Trigger Error )

t acc
t jitter  
-  × Frequency
- + --------------------------=   ± Time Base Error ± ---------------------------- ± 2 ×  -----------------------------------------------------------------------------------------Gate Time
 Gate Time × Number of Samples Gate Time 


Number of Samples = 200,000 since Frequency is greater than 200kHz and gate time equals 1 second
Time Base Error = Temperature Stability + 3 Days × Daily Aging Rate
= 2.5 × 10

–9

= 4.0 × 10

–9

+ 3 × ( 5 × 10

– 10

)

– 10
 4 × ( 500 × 10 –12 s ) 2 + ( 2 × 0 ) 50 × 10 –12 s 

1 × 10 s
–9
Measurement Error =   ± 4.0 × 10 ± --------------------------- ± 2 ×  ------------------------------------------------------------------------------- + ------------------------------  × 15MHz
1s
1s
1s × 200, 000




= ( ± 4.1 × 10

–9

= ( ± 4.1 × 10

–9

± 2 × ( 4.47 × 10
± 1.09 × 10

– 10

– 12

+ 50 × 10

– 12

) ) × 15MHz

) × 15MHz

= ± 63.1 mHz

Assembly-Level Service Guide

8-7

8

Which is to say that the HP 53181A would display results in the range 15 MHz ±63.1 mHz. Note however that the dominant error is the Time
Base Error. If an even higher stability time base is available to the instrument or if the instrument can be source locked to the 15 MHz signal,
then this error term can be substantially reduced. The measurement resolution under these conditions is ±0.8 MHz (1 sigma) which
determines the number of digits displayed.

Chapter 8 HP 53181A Specifications
Measurement Specifications (Continued)

Measurement Specifications (Continued)
Frequency Ratio:

⁄

Ch1

Ch2

Ch2

⁄

Ch1

Measurement is specified over the full signal range of each input.
Results Range:
‘Auto’ Gate Time:
LSD:

10–10 to 1011
100 ms (or sufficient cycles on Channel 1 to make a valid measurement, whichever is longer)

1
Ratio 1⁄2 : ----------------------------------------------------------Ch2 Freq × Gate Time
Ch2 Freq
Ratio 2⁄1 : -----------------------------------------------------------------2
( Ch1 Freq ) × Gate Time

RMS Resolution:
2

2 × 1 + ( Ch1 Freq × Ch2 Trigger Error )
Ratio 1⁄2 : ------------------------------------------------------------------------------------------------------------Ch2 Freq × Gate Time
2

2 × Ch2 Freq × 1 + ( Ch1 Freq × Ch2 Trigger Error ) Ratio 2⁄1 : ------------------------------------------------------------------------------------------------------------------------------------------2
( Ch1 Freq ) × Gate Time

8

To minimize relative phase measurement error, connect the higher frequency signal to Channel 1 when possible.

Peak Volts
Measurement is specified on Channels 1 for DC signals; or for AC signals of frequencies between 100 Hz and 30 MHz with peak-to-peak
amplitude greater than 100 mV. (The measurement will continue to operate up to 225 MHz, though results are for indication only.)
Results Range:
–5.1 V to +5.1 V
Resolution:
10 mV
Systematic Uncertainty for AC signals: 25 mV + 10% of V
for DC signals: 25 mV + 2% of V
Use of the input attenuator multiplies all voltage specifications (input range, results range, resolution and systematic uncertainty) by a
nominal factor of 10. For example with AC signals, the Systematic Uncertainty becomes: 250 mV + 10% of V.

8-8

Assembly-Level Service Guide

Chapter 8 HP 53181A Specifications
Measurement Definitions

Measurement Definitions
Definitions of Systematic Uncertainty Terms
•

Trigger Error
External source and input amplifier noise may advance or delay the trigger points that define the beginning and end of a measurement.
The resulting timing uncertainty is a function of the slew rate of the signal and the amplitude of spurious noise spikes (relative to the input
hysteresis band).
The (rms) trigger error associated with a single trigger point is:
2

2

( E in put ) + ( E signa l )
Trigger Error = ------------------------------------------------------------------------------------------------------- (in seconds)
Input Signal Slew Rate at Trigger Point

where
Einput = RMS noise of the input amplifier: 1 mVrms (350 µVrms typical). Note that the internal measurement algorithms significantly
reduce the contribution of this term.
Esignal = RMS noise of the input signal over a 225 MHz bandwidth (100 kHz bandwidth when the low-pass filter is enabled). Note that
the filter may substantially degrade the signal’s slew rate at the input of the trigger comparator.
•

Fractional Time Base Error
Time base error is the maximum fractional frequency variation of the time base due to aging or fluctuations in ambient temperature or line
voltage:
∆f
Time Base Error =  ----f

aging rate

∆f
+ ----f

temperature

∆f
+ ----f



line voltage

Typical Versus Worst Case Specifications
Specifications identified as “Typical” represent performance of the instrument that the majority of users will perceive under a wide variety of
conditions and signals. The specifications identified as “Worst Case” should be used when the instrument is under extreme environmental
conditions or when the accuracy of the measurement results are critically important.

Assembly-Level Service Guide

8-9

8

Multiply this quantity by the measurement result to yield the absolute error for that measurement. Averaging measurements will not reduce
(fractional) time base error. The HP 53181A counters exhibits negligible sensitivity to line voltage; consequently this term may be ignored.

Chapter 8 HP 53181A Specifications
Measurement Arming and Processing

Measurement Arming and Processing
Gate Time

Measurement Throughput

Auto Mode, or 1 ms to 1000 s

HP-IB ASCII:
200 Measurements/s (maximum)
(See examples in the Programming Guide for ways to optimize
measurement throughput)

Measurement Arming

8

Start Measurement:
Free Run, Manual, or External
Stop Measurement:
Continuous, Single, External, or Timed
Arming Modes:
(Note: auto arming is the only mode available for the Peak Volts function.)
Auto Arming:
Measurements are initiated immediately and acquired as fast as possible, using a minimum number of signal
edges. Auto arming offers the highest measurement throughput, though measurement resolution may be
reduced.
Timed Arming:
The duration of the measurement is internally timed to a user-specified value (also known as the “gate time”).
This mode should be used when the length of the measurement time must be controlled.
Digits Arming:
Measurements are performed to the requested resolution (number of digits) through automatic selection of the
acquisition time. This is the most convenient mode when a specific measurement resolution is desired.
External Arming:
An edge on the External Arm Input enables the start of each measurement. Auto Arming, Timed arming modes or
another edge on the External Arm Input may be used to complete the measurement.

Measurement Statistics
Available Statistics:
Mean, Minimum, Maximum, Standard Deviation
Number of Measurements: 2 to 1,000,000. Statistics may be collected on all measurements or on only those which are between the limit
bands. When the Limits function is used in conjunction with Statistics, N (number of measurements) refers to the
number of in-limit measurements. In general, measurement resolution will improve in proportion to N , up to the
numerical processing limits of the instrument.
Measurements:
Statistics may be collected for all measurements except Peak Volts.

Measurement Limits
Limit Checking:
Display Modes:

Out-of-Limits Indication:

The measurement value is checked against user-specified limits at the end of each measurement.
The measurement result may be displayed as either the traditional numeric value or graphically as an asterisk
moving between two vertical bars. These bars define the upper and lower limits, and the asterisk represents the
current measurement result relative to these limits.
The out-of-limits condition can be indicated by any of the following methods:
• The limits annunciator will light on the front panel display.
• The instrument will generate an SRQ if enabled via HP-IB.
• The limits hardware signal provided via the RS-232 connector will go low for the duration of the out-of-limit
condition (see the description of this connector under the General Information section of this specifications
table).
• If the Analog Display mode is enabled, the asterisk appears outside the vertical bars, which define the upper
and lower limits.

8-10

Assembly-Level Service Guide

Chapter 8 HP 53181A Specifications
General Information

General Information
Save and Recall:

Up to 20 complete instrument setups may be saved and recalled later. These setups are retained when
power is removed from the counter.
88.5 mm x 212.6 mm x 348.3 mm
3.5 kg maximum
AC Line Supply
DC Supply (Option 002 Only)

Rack Dimensions (HxWxD):
Weight:
Power Supply Voltage:

100 to 120 VAC ±10% - 50, 60 or 400 Hz ±10%
220 to 240 VAC ±10% - 50 or 60 Hz ±10%
AC Line Voltage Selection: Automatic
170 VA maximum (30 W typical)

Power Requirements:
Operating Environment:
Storage Environment:
Remote Interface:
HP-IB Interface Capabilities:
Remote Programming Language:
Safety:
EMC:

Note on Pin 4:

1 2 3 4 5

6 7 8 9

Option 002 may not be ordered with Option 060
4A initial inrush at 10 VDC
3A max, once stabilized

0° C to 55° C
–40° C to 71° C
HP-IB (IEEE 488.1-1987, IEEE 488.2-1987)
SH1, AH1, T5, TE0, L4, LE0, SR1, RL1, PP0, DC1, DT1, C0, E2
SCPI-1992.0 (Standard Commands for Programmable Instruments)
Designed in compliance with IEC 1010-1, UL 3111-1 (draft), CAN/CSA 1010.1
CISPR-11, EN50082-1, IEC 801-2, -3, -4
Electrostatic Discharge and Fast Transient/Burst Immunity Testing: When the product is operated at
maximum sensitivity (20 mVrms) and tested with 8kV AD according to IEC801-2 or with 1kV power line
transients according to IEC 801-4, frequency miscounts may occur that will affect measurement data
made during these disturbances.
Radiated Immunity Testing: When the product is operated at maximum sensitivity (20 mVrms) and tested
at 3 V/m according to IEC 801-3, external 100 to 200 MHz electric fields may cause frequency miscounts.
The rear-panel RS-232 connector is a 9-pin connector (DB-9, male). You can connect the universal
counter to any terminal or printer with a properly configured DTE connector (DB-25). You can use a
standard interface cable (HP part number 24542G or 24542H). Data is “output only”; the instrument can
not be programmed via the RS-232 interface.
May be used as either a DTR signal or an indication of measurement in-limit as configured by the Utility menu.
When used as an in-limit indicator, the signal will be high for every measurement within the user set limits.

Pin Number

Type

2

Input

3

Output

Transmit Data (TxD)

4

Output

Data Terminal Ready (DTR)
Measurement In-Limit Signal

5

—

6

Input

*

Description
Receive Data (RxD) (for Xon/Xoff only)

Signal Ground
Data Set Ready (DSR)

All other pins: no connection

Assembly-Level Service Guide

8-11

8

RS-232C:

10 to 32 VDC, 3-pin male XLR connector

Chapter 8 HP 53181A Specifications

8

General Information

8-12

Assembly-Level Service Guide

Index
NUMERICS
1.5/3.0/5.0/12.4 GHz Channel (Option
015/030/050/124), 3-13

A
A4 AC Power Supply, 3-15
A5 DC Power Input (Option 002), 3-17
A6 High Stability Timebase (Options
001, 010, 012), 3-19
accessories
available, xix
supplied, xix
accessories available, xix
accessories supplied, xix
arming modes
auto, 8-10
digits, 8-10
external, 8-10
time, 8-10
assemblies, exchange, 5-2
assembly identification, 2-43, 2-44
assembly identification and
location, 2-40
assembly procedures, 3-2
auto arming, 8-10
available options, xviii

B
backdating, 6-3
backdating firmware, 6-8, 6-16
backdating hardware, 6-3
bezel, 3-6

C
cabinet parts and hardware, 5-6
CAL SECURE, 2-9, 2-15, 2-28, 2-31
CAL UNSECURE, 2-9, 2-15, 2-28, 2-31
calibration, 2-6, 2-25
count, 2-14, 2-30
Help menu, 2-14, 2-30
initiate, 2-9, 2-29

Assembly-Level Service Guide

new security code, 2-13, 2-30
procedures, 2-15
secure against calibration, 2-29
security status, 2-9, 2-28
unsecure, 2-9, 2-28
calibration cycle, 1-3
Calibration Menu
HP 53131A/132A, 2-6
HP 53181A, 2-25
Calibration menu, 2-25
HP 53131A/132A, 2-8
Calibration Menu tree
HP 53181A, 2-27
calibration procedures
HP 53131A/132A, 2-15
HP 53181A, 2-31
changes, 6-2
chassis parts, 5-9
Check digit, 5-3
complete performance tests, 1-3
HP 53131A/132A, 1-16
HP 53181A, 1-47
contacting Hewlett-Packard, 5-5
Corrective maintenance, 2-2
cover, 3-4

D
description of
self-test routines, 2-47
description of counter, xvi
diagnosing the faulty assembly, 2-49
digits arming, 8-10
disassemble
1.5/3.0/5.0/12.4 GHz Channel
(Option 015/030/050/124), 3-13
A4 AC Power Supply, 3-15
A5 DC Power Input (Option
002), 3-17
A6 High Stability Timebase (Options
001, 010, 012), 3-19

Index-1

Index

cover, 3-4
display board, 3-11
front bezel, 3-6
keypads, 3-11
motherboard, 3-9
Rear Terminals (Option 060) , 3-21
window, 3-11
disk
HP 53131A/132A, 1-40
HP 53181A, 1-70
disks program, 1-3
display board, 3-11

E
Electrostatic discharge, 2-38
entering a new security code, 2-30
equipment required, 1-4
example procedure for
running the self test, 2-49
exchange assemblies, 2-40, 2-41, 2-42,
5-2
exploded view, 5-9
Express Repair/Performance
Calibration Service, xiii
external arming, 8-10

F
fan, 1-5
fine time interval calibration, 2-11
front bezel, 3-6
front rubber bumper removal , 3-6

G
Ground continuity test, 2-39

H
handle removal, 3-6
HP 5071A assembly
identification, 2-40, 2-41, 2-42
HP-IB program, 1-3
HP-IB verification, 1-3
HP 53131A/132A, 1-40
HP 53181A, 1-70
HP-IB verification (optional), 1-3
HP-IB verification program, 1-70

Index-2

HP 53131A/132A, 1-40

I
initiating calibration, 2-9, 2-29
installing options
A3 1.5 GHz Channel 2 (Option
015), 4-3
A3 3 GHz Channel 3 (Option
030), 4-3
A3 5 GHz Channel 3 (Option
050), 4-3
DC Power Input (Option 002), 4-4
High Stability Timebase (Option
001), 4-11
High Stability Timebase (Option
010), 4-11
High Stability Timebase (Option
012), 4-11
Rear Terminals (Option 060), 4-14
Instrument
cabinet parts and hardware, 5-6
defective assemblies, 5-2
identification, xiii
packing for shipment, 2-4
parts identification, 5-4
pre-troubleshooting
information, 2-36
recommended test equipment, 2-37
replaceable parts, 5-2
safety considerations, 2-36
serial and model number, 5-4
serial number prefix, xiv
Instrument identification, xiii
Instrument model number, 2-3
Insulation resistance test, 2-39
IPB, 5-9

K
keypads, 3-11

L
list of options, xviii
list, replaceable parts, 5-7, 5-10

Assembly-Level Service Guide

Index

M
Maintenance, corrective, 2-2
manual changes, 6-2
model number, 5-4
motherboard, 3-9

N
new security code entry, 2-13

O
older instruments, 6-2
operational verification, 1-2, 1-5
Option 001, 4-11
Option 002, 4-4
Option 010, 4-11
Option 012, 4-11
Option 015, 4-3
Option 030, 4-3
Option 050, 4-3
Option 060, 4-14
options, xviii
hardware, xviii
support, xix
ordering parts, 5-4
organization of guide, xiv

P
Packing the instrument, 2-4
Part numbers, 5-2
parts identification, 5-4
parts, chassis, 5-9
parts, ordering, 5-4
performance test record
HP 53131A/132A, 1-41
HP 53181A, 1-71
performance tests, 1-3, 1-16
HP 53131A/132A, 1-16
HP 53181A, 1-47
plug removal, 4-15
plug, XLR, 4-10
power supply check, 2-45
power supply voltages, 2-47
power-on self tests, 1-5

Assembly-Level Service Guide

Pre-troubleshooting information, 2-2,
2-36
Product performance checks, 2-39

Q
quick time interval calibration, 2-10

R
Rear Terminals (Option 060), 3-21
reassembly procedures, 3-2
Recommended test equipment, 2-37
reference designations, 5-3
removal
1.5/3.0/5.0/12.4 GHz Channel
(Option 015/030/050/124), 3-13
A4 AC Power Supply, 3-15
A5 DC Power Input (Option
002), 3-17
A6 High Stability Timebase (Options
001, 010, 012), 3-19
cover, 3-4
display board, 3-11
front bezel, 3-6
front rubber bumper, 3-6
handle, 3-6
keypads, 3-11
motherboard, 3-9
Rear Terminals (Option 060), 3-21
window, 3-11
repair information, 2-3
repair strategy, xiii
Replaceable assemblies, 5-2
Replaceable parts, 5-2
replaceable parts list, 5-7, 5-10
retrofitting options
A3 1.5 GHz Channel 2 (Option
015), 4-3
A3 3 GHz Channel 3 (Option
030), 4-3
A3 5 GHz Channel 3 (Option
050), 4-3
DC Power Input (Option 002), 4-4
High Stability Timebase (Option
001), 4-11

Index-3

Index

High Stability Timebase (Option
010), 4-11
High Stability Timebase (Option
012), 4-11
Rear Terminals (Option 060), 4-14
returning instrument for repair, 2-3
Returning the instrument to HewlettPackard, 2-3
Returning the instrument to HP, 2-2

S
Safety considerations, 2-36
Securing against calibration, 2-13, 2-29
security status, 2-9, 2-28
self-test routines, 2-47
serial number, 2-3, 5-4
Serial number prefix, xiv
serial prefix, xiv
Service manual
organization, xiv
specifications, 7-2, 8-2
dimensions, 7-16
frequency range, 7-2, 8-2
HP 53131A/132A, 7-2
HP 53181A, 8-2
measurement throughput, 7-14
power supply voltage, 7-16, 8-11
RS-232C connector pin
assignments, 7-16
time base stability, 7-4, 8-4
voltage range and sensitivity, 7-2
Surface Mount repair, 2-38

top Internal view, 2-44
top internal view, 2-43
Troubleshooting
assembly identification and
location, 2-40
disassembly and reassembly, 2-38
electrostatic discharge, 2-38
ground continuity test, 2-39
insulation resistance test, 2-39
product performance checks, 2-39
product safety checks, 2-39
self test, 2-50
visual inspection, 2-39
troubleshooting table, 2-52
troubleshooting the Counter, 2-45

V
Visual inspection, 2-39

W
window, 3-11

X
XLR plug, 4-10

T
TEST, 2-47
test equipment, 1-4
test record, 1-3
HP 53131A/132A, 1-41
HP 53181A, 1-71
time arming, 8-10
timebase
calibration, 2-7, 2-10, 2-24, 2-29,
2-35, 6-15
tools required, 3-3

Index-4

Assembly-Level Service Guide

Contacting Hewlett-Packard:
For more information about Hewlett-Packard test and measurement products, applications, and services, visit our web
site at: http://www.hp.com/go/tmdir
HP’s Test and Measurement Fax Service for United States and Canada:
Technical information for test and measurement products and services is available 24 hours a day,
7 days a week, by calling 1-800-800-5281.
Technical Support:
If you need technical assistance with a Hewlett-Packard test and measurement product or application, you can contact
one of the following centers and ask for a test and measurement sales representative. For a complete list of worldwide
Hewlett-Packard sales offices, refer to the web site listed above.
Africa and Middle East:

Canada:

Latin America:

Hewlett-Packard S.A.
International Sales Branch
Middle East/Africa
Geneva, Switzerland

Hewlett-Packard (Canada) Ltd.
HP DIRECT
Mississauga, ON, Canada

Hewlett-Packard Co.
Latin America Region Headquarters
Miami, FL, U.S.A.

Tel: 877-894-4414
Fax: (905) 206-4700

Tel: (305) 267-4245
Fax: (305) 267-4288

Europe:

United States:

Hewlett-Packard Nederland B.V.
Test & Measurement
European Marketing Organisation
The Netherlands

Hewlett-Packard Co.
Test & Measurement Call Center
Englewood, CO, U.S.A.

Tel: (41/22) 780-4111
Fax: (41/22) 780-4770

Asia Pacific:
Hewlett-Packard Asia Pacific Ltd.
Hong Kong, SAR
Tel: (852) 2599-7777
Fax: (852) 2506-9284

Australia/New Zealand:
Hewlett-Packard Australia Ltd.
Blackburn, Victoria, Australia
Tel: 1-800-629-485 (Australia)
Tel: 0-800-738-378 (New Zealand)
Fax: (61-3) 9272-0749

Tel: +31 20 547 9999
Fax: +31 20 547 7799

Tel: (800) 452-4844
Fax: (303) 662-3726

Japan:
Hewlett-Packard Japan Ltd.
Measurement Assistance Center
Tokyo, Japan
Tel: 81-426-56-7832
Fax: 81-426-56-7843

Printed in U.S.A
Data subject to change
Rev 11/98

Continued from front matter. . .
Warranty (contd)
HP does not warrant that the
operation of HP products will be
uninterrupted or error free. If
HP is unable, within a
reasonable time, to repair or
replace any product to a
condition as warranted,
customer will be entitled to a
refund of the purchase price
upon prompt return of the
product.
HP products may contain
remanufactured parts
equivalent to new in
performance or may have been
subjected to incidental use.
The warranty period begins on
the date of delivery or on the
date of installation if installed
by HP. If customer schedules or
delays HP installation more
than 30 days after delivery,
warranty begins on the 31st day
from delivery.
Warranty does not apply to
defects resulting from
(a) improper or inadequate
maintenance or calibration,
(b) software, interfacing, parts
or supplies not supplied by HP,
(c) unauthorized modification or
misuse, (d) operation outside of
the published environmental
specifications for the product, or
(e) improper site preparation or
maintenance.
TO THE EXTENT ALLOWED
BY LOCAL LAW, THE ABOVE
WARRANTIES ARE
EXCLUSIVE AND NO OTHER
WARRANTY OR CONDITION,
WHETHER WRITTEN OR
ORAL, IS EXPRESSED OR
IMPLIED AND HP
SPECIFICALLY DISCLAIMS
ANY IMPLIED WARRANTIES
OR CONDITIONS OF
MERCHANTABILITY,
SATISFACTORY QUALITY,
AND FITNESS FOR A
PARTICULAR PURPOSE.
HP will be liable for damage to
tangible property per incident
up to the greater of $300,000 or
the actual amount paid for the
product that is the subject of the
claim, and for damages for
bodily injury or death, to the
extent that all such damages

are determined by a court of
competent jurisdiction to have
been directly caused by a
defective HP product.
TO THE EXTENT ALLOWED
BY LOCAL LAW, THE
REMEDIES IN THIS
WARRANTY STATEMENT
ARE CUSTOMER’S SOLE AND
EXCLUSIVE REMEDIES.
EXCEPT AS INDICATED
ABOVE, IN NO EVENT WILL
HP OR ITS SUPPLIERS BE
LIABLE FOR LOSS OF DATA
OR FOR DIRECT, SPECIAL,
INCIDENTAL,
CONSEQUENTIAL
(INCLUDING LOST PROFIT
OR DATA), OR OTHER
DAMAGE, WHETHER BASED
IN CONTRACT, TORT, OR
OTHERWISE.
For consumer transactions in
Australia and New Zealand: the
warranty terms contained in
this statement, except to the
extent lawfully permitted, do
not exclude, restrict or modify
and are in addition to the
mandatory statutory rights
applicable to the sale of this
product to you.
Assistance
Product maintenance
agreements and other customer
assistance agreements are
available for Hewlett-Packard
products.
For any assistance, contact your
nearest Hewlett-Packard Sales
and Service Office.

Safety Considerations
(contd)
WARNING
INSTRUCTIONS FOR
ADJUSTMENTS WHILE
COVERS ARE REMOVED
AND FOR SERVICING ARE
FOR USE BY SERVICETRAINED PERSONNEL
ONLY. TO AVOID
DANGEROUS ELECTRIC
SHOCK, DO NOT PERFORM
SUCH ADJUSTMENTS OR
SERVICING UNLESS
QUALIFIED TO DO SO.
WARNING
ANY INTERRUPTION OF THE
PROTECTIVE GROUNDING
CONDUCTOR (INSIDE OR
OUTSIDE THE PRODUCT’S
CIRCUITRY) OR
DISCONNECTING THE
PROTECTIVE EARTH
TERMINAL WILL CAUSE
A POTENTIAL SHOCK
HAZARD THAT COULD
RESULT IN PERSONAL
INJURY. (GROUNDING ONE
CONDUCTOR OF A TWO
CONDUCTOR OUTLET IS
NOT SUFFICIENT
PROTECTION.)

rating and type (for example,
normal blow, time delay). Do not
use repaired fuses or short
circuited fuseholders.
Acoustic Noise Emissions
LpA<47 dB at operator position,
at normal operation, tested per
EN 27779. All data are the
results from type test.
Geräuschemission
LpA<47 dB am Arbeits
platz, normaler Betrieb, geprüft
nach EN 27779.
Die Angagen beruhen auf
Ergebnissen von
Typenprüfungen.

Whenever it is likely that the
protection has been impaired,
the instrument must be made
inoperative and be secured
against any unintended
operation.
If this instrument is to be
energized via an
autotransformer (for voltage
reduction) make sure the
common terminal is connected
to the earthed pole terminal
(neutral) of the power source.
Instructions for adjustments
while covers are removed and
for servicing are for use by
trained-personnel only. To avoid
dangerous electric shock, do not
perform such adjustments or
servicing unless qualified to do
so.
For continued protection
against fire, replace the line
fuse(s) of the same current
7.NL.A.11.03.97.R1.P.CW6BC


Manual Part Number 53131-90039

Printed in U.S.A, MARCH 1999

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