Fluke Car Amplifier 5220A Users Manual

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5220A Instruction Manual
1. Introduction and Specifications
- Introduction
- Specifications
2. Operating Instructions
3. Theory of Operation
4. Maintenance
5. List of Replaceable Parts
6. Option and Accessory Information
- Introduction
- Accessories
7. Schematic Diagrams

5220A

Transconductance Amplifier

Instruction Manual

PN 491936

June 1979 Rev. 3, 6/97

All product names are trademarks of their respective companies.

LIMITED WARRANTY AND LIMITATION OF LIABILITY

Each Fluke product is warranted to be free from defects in material and workmanship under

normal use and service. The warranty period is one year and begins on the date of shipment.

Parts, product repairs, and services are warranted for 90 days. This warranty extends only to the

original buyer or end-user customer of a Fluke authorized reseller, and does not apply to fuses,

disposable batteries, or to any product which, in Fluke’s opinion, has been misused, altered,

neglected, contaminated, or damaged by accident or abnormal conditions of operation or

handling. Fluke warrants that software will operate substantially in accordance with its functional

specifications for 90 days and that it has been properly recorded on non-defective media. Fluke

does not warrant that software will be error free or operate without interruption.

Fluke authorized resellers shall extend this warranty on new and unused products to end-user

customers only but have no authority to extend a greater or different warranty on behalf of Fluke.

Warranty support is available only if product is purchased through a Fluke authorized sales outlet

or Buyer has paid the applicable international price. Fluke reserves the right to invoice Buyer for

importation costs of repair/replacement parts when product purchased in one country is submitted

for repair in another country.

Fluke’s warranty obligation is limited, at Fluke’s option, to refund of the purchase price, free of

charge repair, or replacement of a defective product which is returned to a Fluke authorized

service center within the warranty period.

To obtain warranty service, contact your nearest Fluke authorized service center to obtain return

authorization information, then send the product to that service center, with a description of the

difficulty, postage and insurance prepaid (FOB Destination). Fluke assumes no risk for damage in

transit. Following warranty repair, the product will be returned to Buyer, transportation prepaid

(FOB Destination). If Fluke determines that failure was caused by neglect, misuse, contamination,

alteration, accident, or abnormal condition of operation or handling, including overvoltage failures

caused by use outside the product’s specified rating, or normal wear and tear of mechanical

components, Fluke will provide an estimate of repair costs and obtain authorization before

commencing the work. Following repair, the product will be returned to the Buyer transportation

prepaid and the Buyer will be billed for the repair and return transportation charges (FOB

Shipping Point).

THIS WARRANTY IS BUYER'S SOLE AND EXCLUSIVE REMEDY AND IS IN LIEU OF ALL

OTHER WARRANTIES, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO ANY

IMPLIED WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.

FLUKE SHALL NOT BE LIABLE FOR ANY SPECIAL, INDIRECT, INCIDENTAL, OR

CONSEQUENTIAL DAMAGES OR LOSSES, INCLUDING LOSS OF DATA, ARISING FROM

ANY CAUSE OR THEORY.

Since some countries or states do not allow limitation of the term of an implied warranty, or

exclusion or limitation of incidental or consequential damages, the limitations and exclusions of

this warranty may not apply to every buyer. If any provision of this Warranty is held invalid or

unenforceable by a court or other decision-maker of competent jurisdiction, such holding will not

affect the validity or enforceability of any other provision.

Fluke Corporation

P.O. Box 9090

Everett, WA 98206-9090

U.S.A.

Fluke Europe B.V.

P.O. Box 1186

5602 BD Eindhoven

The Netherlands

11/99

Table of Contents

Section Title Page

1 Introduction and Specifications........................................................ 1-1

1-1. Introduction .......................................................................................... 1-1

1-2. Specifications ....................................................................................... 1-2

2 Operating Instructions....................................................................... 2-1

2-1. Introduction .......................................................................................... 2-1

2-2. Shipping Information............................................................................ 2-1

2-3. Input Power .......................................................................................... 2-1

2-4. Fuse Replacement................................................................................. 2-2

2-5. AC Line Fuse ................................................................................... 2-2

2-6. Power Supply Fuses......................................................................... 2-2

2-7. Rack Installation................................................................................... 2-2

2-8. Operating Features................................................................................ 2-2

2-9. Operating Notes.................................................................................... 2-5

2-10. AC Line Connection ........................................................................ 2-5

2-11. Transconductance Amplifier............................................................ 2-5

2-12. Input Voltage Requirements ............................................................ 2-5

2-13. Input Voltage Selection, Front/Rear ................................................ 2-6

2-14. Current Output, Front/Rear.............................................................. 2-6

2-15. Standby/Operate............................................................................... 2-6

2-16. Local/Remote................................................................................... 2-6

2-17. Status Indicators............................................................................... 2-6

2-18. Audible Output................................................................................. 2-7

2-19. Inductive Loads................................................................................ 2-7

2-20. Operation.............................................................................................. 2-9

3 Theory of Operation........................................................................... 3-1

3-1. Introduction .......................................................................................... 3-1

3-2. Overall Functional Description ............................................................ 3-1

3-3. General............................................................................................. 3-1

3-4. Analog Section................................................................................. 3-1

3-5. Digital Section.................................................................................. 3-4

3-6. Circuit Analysis.................................................................................... 3-4

3-7. Power Supply................................................................................... 3-4

5220A

Instruction Manual

3-8. Preamplifier...................................................................................... 3-6

3-9. A6 Driver ......................................................................................... 3-7

3-10. A7 Output......................................................................................... 3-9

3-11. A8 Analog Control........................................................................... 3-10

3-12. A9 Front Panel ................................................................................. 3-11

3-13. A10 Logic ........................................................................................ 3-11

3-14. Reset Logic .................................................................................. 3-11

3-15. Timing Logic ............................................................................... 3-13

3-16. Standby/Operate Logic ................................................................ 3-14

3-17. Local/Remote Logic .................................................................... 3-15

3-18. Front/Rear Input Logic ................................................................ 3-15

3-19. Failure Status Logic..................................................................... 3-16

3-20. A11 MIS Bus Interface .................................................................... 3-16

4 Maintenance ....................................................................................... 4-1

4-1. Introduction .......................................................................................... 4-1

4-2. Service Information.............................................................................. 4-2

4-3. General Maintenance............................................................................ 4-2

4-4. Cleaning ........................................................................................... 4-2

4-5. Air Filter Maintenance..................................................................... 4-2

4-6. Access Information .......................................................................... 4-2

4-7. Internal Components/Assemblies ................................................ 4-4

4-8. Front Panel Removal ................................................................... 4-4

4-9. A9 Front Panel PCB Removal..................................................... 4-4

4-10. A2 Transformer Assembly Removal ........................................... 4-4

4-11. A6 Driver and A7 Output Assembly Removal............................ 4-5

4-12. A3 Cap Bus Removal .................................................................. 4-5

4-13. A12 Shunt Assembly Removal.................................................... 4-5

4-14. Fuse Replacement ............................................................................ 4-6

4-15. Ac Line Fuse................................................................................ 4-6

4-16. Power Supply Fuses..................................................................... 4-6

4-17. Line Voltage Selection..................................................................... 4-6

4-18. Output Terminal Selection, Front/Rear............................................ 4-7

4-19. Service Tools.................................................................................... 4-8

4-20. Performance Test.................................................................................. 4-8

4-21. Initial Conditions.............................................................................. 4-8

4-22. Front Panel Tests.............................................................................. 4-9

4-23. Zero Output...................................................................................... 4-9

4-24. DC Accuracy and Line Regulation .................................................. 4-10

4-25. Harmonic Distortion......................................................................... 4-10

4-26. Frequency Response......................................................................... 4-11

4-27. Overcurrent Trip Test....................................................................... 4-11

4-28. Overvoltage Trip Test ...................................................................... 4-12

4-29. Calibration Adjustments....................................................................... 4-12

4-30. Initial Conditions.............................................................................. 4-13

4-31. Input Offset Adjustment................................................................... 4-13

4-32. Driver Offset Adjustment................................................................. 4-13

4-33. Output Bias Adjustment................................................................... 4-14

4-34. DC Accuracy Adjustment ................................................................ 4-14

4-35. Frequency Response......................................................................... 4-14

4-36. Overcurrent Adjustment................................................................... 4-15

4-37. Overvoltage Adjustment .................................................................. 4-15

4-38. Replacement of Selected Components ................................................. 4-15

4-39. Resistors R11 and R12..................................................................... 4-16

Contents

(continued)

iii

4-40. Resistor R13..................................................................................... 4-17

4-41. Troubleshooting.................................................................................... 4-18

5 List of Replaceable Parts................................................................... 5-1

5-1. Introduction .......................................................................................... 5-1

5-2. How to Obtain Parts ............................................................................. 5-1

5-3. Manual Status Information................................................................... 5-2

5-4. Newer Instruments................................................................................ 5-2

5-5. Service Centers..................................................................................... 5-2

6 Option and Accessory Information................................................... 6-1

6-1. Introduction .......................................................................................... 6-1

6-2. Accessories........................................................................................... 6-1

6-3. Rack Mounting Kit (M08-205-600)................................................. 6-1

6-4. Rack Slide Kit (M00-280-610) ........................................................ 6-3

6-5. Precision Y5020A Current Shunt..................................................... 6-3

7 Schematic Diagrams.......................................................................... 7-1

5220A

Instruction Manual

List of Tables

Table Title Page

1-1. Accessories ............................................................................................................ 1-2

1-2. Specifications......................................................................................................... 1-2

2-1. Controls, Indicators, and Connectors..................................................................... 2-4

3-1. Effect of Reset Command on A10 Logic and A9 Front Panel............................... 3-13

4-1. Required Test Equipment ...................................................................................... 4-1

4-2. DC Accuracy Test.................................................................................................. 4-10

4-3. Frequency Response Test ...................................................................................... 4-11

4-4. Replacement Resistors for R11 and R12 ............................................................... 4-17

4-5. Replacement Resistors for R13.............................................................................. 4-18

4-6. Mainframe and Digital Section Troubleshooting Guide........................................ 4-21

4-7. Analog Section Troubleshooting Guide................................................................. 4-25

5-1. 5220A Final Assembly .......................................................................................... 5-4

5-2. A1 Motherboard PCB Assembly ........................................................................... 5-17

5-3. A2 Power Transformer Assembly ......................................................................... 5-18

5-4. A3 Capacitor Bus PCB Assembly ......................................................................... 5-19

5-5. A4 Regulator PCB Assembly ................................................................................ 5-21

5-6. A5 Preamplifier PCB Assembly............................................................................ 5-23

5-7. A6 Driver PCB Assembly...................................................................................... 5-26

5-8. A7 Output PCB Assembly..................................................................................... 5-28

5-9. A8 Analog Control PCB Assembly....................................................................... 5-31

5-10. A9 Front Panel PCB Assembly.............................................................................. 5-33

5-11. A10 Logic PCB Assembly..................................................................................... 5-34

5-12. A11 MIS Bus Interface PCB Assembly................................................................. 5-36

5-13. A12 Shunt Assembly ............................................................................................. 5-38

5-14. A13 Output Termination PCB Assembly .............................................................. 5-40

5-15. A14 Extender PCB Assembly................................................................................ 5-41

5220A

Instruction Manual

vii

List of Figures

Figure Title Page

5220A Transconductance Amplifier...................................................................... x

1-1. Outline Drawings................................................................................................... 1-5

2-1. Controls, Indicators, and Connectors..................................................................... 2-3

2-2. Maximum Load Inductance vs Frequency............................................................. 2-8

2-3. Typical Transconductance Error for Inductive Loads ........................................... 2-9

3-1. 5220A Functional Block Diagram......................................................................... 3-2

3-2. Transconductance Amplifier Simplified Circuit Diagram..................................... 3-3

3-3. Power Supply Functional Block Diagram ............................................................. 3-5

3-4. A5 Preamplifier Functional Block Diagram.......................................................... 3-6

3-5. A6 Driver Functional Block Diagram.................................................................... 3-8

3-6. A7 Output Functional Block Diagram................................................................... 3-9

3-7. A8 Analog Control Simplified Block Diagram ..................................................... 3-10

3-8. A10 Logic Simplified Block Diagram................................................................... 3-12

3-9. Timing Sequence ................................................................................................... 3-14

3-10. A11 MIS Bus Interface.......................................................................................... 3-18

4-1. Internal Component/Assembly Locations.............................................................. 4-3

4-2. Line Voltage Selection........................................................................................... 4-7

4-3. Test Point Location/Identification ......................................................................... 4-19

4-4. Flowchart Summary of Mainframe and Digital Section Troubleshooting Guide.. 4-20

4-5. Flowchart Summary of Analog Section Troubleshooting Guide........................... 4-24

5-1. 5220A Final Assembly .......................................................................................... 5-8

5-2. A1 Motherboard PCB Assembly ........................................................................... 5-17

5-3. A2 Power Transformer Assembly ......................................................................... 5-18

5-4. A3 Capacitor Bus PCB Assembly ......................................................................... 5-20

5-5. A4 Regulator PCB Assembly ................................................................................ 5-22

5-6. A5 Preamplifier PCB Assembly............................................................................ 5-25

5-7. A6 Driver PCB Assembly...................................................................................... 5-27

5-8. A7 Output PCB Assembly..................................................................................... 5-29

5-9. A8 Analog Control PCB Assembly....................................................................... 5-32

5-10. A9 Front Panel PCB Assembly.............................................................................. 5-33

5-11. A10 Logic PCB Assembly..................................................................................... 5-35

5-12. A11 MIS Bus PCB Assembly................................................................................ 5-37

5-13. A12 Shunt Assembly ............................................................................................. 5-39

5-14. A13 Output Termination PCB ............................................................................... 5-40

5-15. A14 Extender PCB Assembly................................................................................ 5-41

5220A

Instruction Manual

viii

6-1. Rack Mounting Kit ................................................................................................ 6-2

6-2. Rack Slide Kit........................................................................................................ 6-4

7-1. Interconnect Diagram............................................................................................. 7-2

7-2. Chassis Wiring....................................................................................................... 7-4

7-3. Power Supply......................................................................................................... 7-6

7-4. A5 Preamplifier PCB Assembly............................................................................ 7-8

7-5. A6 Driver and A7 Output PCB Assemblies .......................................................... 7-10

7-6. A8 Analog Control PCB Assembly....................................................................... 7-12

7-7. A9 Front Panel PCB Assembly.............................................................................. 7-14

7-8. A10 Logic PCB Assembly..................................................................................... 7-16

7-9. A11 MIS Bus Interface PCB Assembly................................................................. 7-18

Contents

(continued)

5220A

Instruction Manual

ajs36f.eps

5220A Transconductance Amplifier

1-1

Section 1

Introduction and Specifications

1-1. Introduction

The Model 5220A is a transconductance amplifier designed to operate as either a stand

alone unit or an extension of the Fluke Model 5100 Series Calibrator. Functionally, the

instrument operates as a precision ac/dc current source for calibrating current shunts

and/or current meters. As the name (transconductance amplifier) implies, the output

current level is a function of an input control voltage. The input/output ratio is established

at 1:1 so that a voltage input in the range of -20 to +20 volts will produce a proportional

current output of -20 to +20 amperes. Input voltages may be either dc or ac levels,

depending on the output requirements. Bandwidth for ac operation is dc to 5 kHz.

Control of the 5220A can be handled locally using front panel controls or remotely by

way of the 5100 Series Calibrator. (The 5100 must be equipped with a Model Y5000

Interface.) Control mode selection is accomplished using two front-panel push button

switches, INPUT and LOCAL. The INPUT switch allows selection of either front or rear

control-voltage input connections. The LOCAL switch is used to recall the 5220A from

remote to local operation.

A series of front panel indicators are used to visually display both the control and

operating status of the 5220A. Control indicators include OPER (operate), STDBY

(standby), FRONT input, REAR input, REMOTE, and LOCAL LOCKOUT. The

combination of lit LEDs indicates the present status of the control mode. Status indicators

include THERMAL CUT-OFF, OVER COMPLIANCE, and OVER CURRENT. When

any one of these indicators is lit, an overload condition has been detected causing the

5220A to switch to standby operation. All indicators are active regardless of the selected

control mode, local or remote.

Current output connections are provided on both the front and rear panels. However, only

one set of terminals is active. Selection of the desired set is accomplished internally and

is, therefore, not considered an operator function. Neither local nor remote operation is

affected by the selection of front or rear output.

Forced-air circulation is incorporated in the 5220A to ensure adequate cooling of the

current output stage. Air is pulled in through a rear-panel filter, passed over the output

stage heat sink, and exhausted through the unit’s side panels.

The 5220A is designed to operate from ac line voltages within the range of 90 V ac to

264 V ac, 50 to 60 Hz. One-of-eight specific voltages (100, 110, 115, 120, 200, 220, 230,

240 V ac +10 %) can be selected to ensure compatibility with the local line voltage. The

5220A

Instruction Manual

1-2

selection switches are inside the 5220A. Refer to Section 4 of this manual for information

on how to properly set the line power switches.

Accessories available for use with the 5220A are listed and described in Table 1-1. The

rack mounting kits are designed for use with a standard 19-inch equipment rack. The

Model Y5020A is a precision current shunt recommended for use in calibrating the

5220A. Specify both model number and description when ordering accessories.

Table 1-1. Accessories

Model No. Description

M07-205-600 Rack Mounting Kit

M00-260-610 Rack Slide Kit, 18 in

M00-280-610 Rack Slide Kit, 24 in

Y5020 Precision Shunt

1-2. Specifications

Specifications for the Model 5220A are given in Table 1-2.

Table. 1-2. Specifications

Calibration Cycle All specifications are valid for a 180-day period at an operating

temperature of 20 °C to 30 °C and a relative humidity of 70 % or

less.

Basic

Transconductance 1 Siemen (1 ampere per volt)

Output Range 0 A to 20 A dc or rms ac (28.3 A peak)

Compliance Voltage ≥±4 V dc or 3 V rms ac (4.25 V peak)

DC Accuracy ±(0.025 % of output +1 mA)

AC Accuracy ±(0.05 % of output + 1 mA) from 30 Hz to 1 kHz, and ±(0.05 % of

output + 1 mA) x f from 1 kHz to 5 kHz, where f = frequency in kHz.

Short Term DC Stability Output changes less than ±(0.005 % + 200 µA) in 10 minutes, with

constant line, load, and temperature.

Short Term AC Stability Output changes less than ±(0.01 % + 500 µA) in 10 minutes, with

constant line, load, and temperature.

Harmonic Distortion and Noise ±(0.05 % of output ±1 mA rms) over frequency range of 30 Hz to 1

kHz and measured with a noise bandwidth of 300 kHz, ±(0.05 % of

output + 1 mA) x f from 1 kHz to 5 kHz, where f = frequency in kHz.

Temperature Coefficient ±(0.0025 % of output + 100 µA) per degree C above 30 °C or

below 20 °C.

Transient Recovery Output will settle to within 0.01 % of final value within 2 seconds

following a programmed change in output current or frequency

(10 ms for 5220A alone).

Introduction and Specifications

Specifications

1-3

Table 1-2. Specifications (cont.)

Electromagnetic Compatibility This instrument is designed to operate in Standard Laboratory

environments where in electromagnetic environment is highly

controlled. If used in areas with RF fields >0.4 V/m there could be

errors in measurement.

DC Mode (including 5100 Series B)

Output Range ±1 to ±19.9999 A

Accuracy of Output ±(0.025 % of selected output + 1 mA)

Resolution ±0.1 mA

Temperature Coefficient ±(0.003 % of selected output + 100 µA) / °C, above 30 °C and

below 20 °C

Line Regulation Output changes less than 0.001 % for a ±10 % change in line

voltage.

Load Regulation Output changes less than ±(0.005 % + 0.3 mA) for a full load

changes of 4 V of compliance.

AC Mode (including 5100 Series B)

Output Range 1 A rms to 19.9999 A rms

Accuracy of Output ±(0.07 % of selected output + 1 mA rms) from 50 Hz to 1 kHz,

and ±(0.07 % of selected output + 1 mA rms) x f from 1 kHz to 5

kHz, where f = frequency in kHz.

Resolution ±0.1 mA rms

Temperature Coefficient ±(0.003 % of selected output + 100 µA rms) per °C, above 30 °C

and below 20 °C.

Short Term Stability Output changes less than ±(0.02 % + 500 µA rms) in 10 minutes,

with constant line, load, and temperature.

Harmonic Distortion and Noise ±(0.07 % of output + 1 mA rms) over frequency range of 30 Hz to

1 kHz a noise bandwidth of 300 kHz, ±(0.07 % of output + 1 mA)

x f from 1 kHz to 5 kHz, where f = frequency in Hz.

Line Regulation Output changes less than 0.005 % for ±10 % changes in line

voltage.

Load Regulation For frequencies less than 1 kHz:

±(0.005 % lout + 150 µA) per volt of output compliance voltage.

For frequencies greater than 1 kHz:

±(0.005 % lout + 150 µA) x f per volt of output compliance

voltage, where f = frequency in kHz.

5220A

Instruction Manual

1-4

Table 1-2. Specifications (cont.)

General

Load Capability Drives all resistive and capacitive loads consistent with current and

compliance voltage capability. For inductive loads greater than

1 µH and less than maximum inductive loads, output current is

limited to 16 A rms (22.6 A peak)

Maximum Isolation Voltage ±20 V dc or 20 V ac rms

Temperature Range Operating: 0 °C to 50 ° C

Storage: +20 °C to 56 °C

Relative Humidity 50 % to 50 °C, 75 % to 40 °C, 95 % to 25 °C

Altitude Operating: 0 ft to10,000 ft

Non-operating: 0 ft to 40,000 ft

Vibration 2 g maximum, 5 Hz to 55 Hz for 15 minutes

Shock 15 g maximum, half sinewave

Power Requirements 100, 110, 115, 120, 200, 220, 230, or 240 V ac ±10 %, switch-

selectable, 50 Hz to 60 Hz, 300 W

Weight 27 kg (50 lb)

Dimensions 17.8 cm H x 43.2 cm W x 55.9 cm D (7 in H x 17 in W x 22 in D),

case only (See Figure 1-1).

Protection Safety Class 1 Relates solely to insulation or grounding properties as defined in

IEC 348.

Introduction and Specifications

Specifications

1-5

ajs01f.wmf

Figure1-1. Outline Drawings

5220A

Instruction Manual

1-6

2-1

Section 2

Operating Instructions

2-1. Introduction

This section of the manual contains information concerning the installation and operation

of the Model 5220A transconductance Amplifier. It is recommended that the contents of

this section be read and understood before any attempt is made to operate the unit. Should

any difficulties arise during operation, contact your nearest John Fluke Sales

representative, or the John Fluke Mfg. Co., Inc., P.O. Box C9090, Everett, WA 98206;

telephone (206) 347-6100.

2-2. Shipping Information

The 5220A is packaged and shipped in a foam-packed container. Upon receipt of the

instrument, a thorough inspection should be made to reveal any possible shipping

damage. Special instructions for inspection and claims are included on the shipping

carton.

If reshipment of the instrument is necessary, the original container should be used. If the

original container is not available, a new container can be obtained from the John Fluke

Mfg. Co., Inc. Please reference the instrument’s model number when requesting a new

shipping container.

2-3. Input Power

The 5220A can be operated from any one of the following 50 to 60 Hz (±1 %) line

voltages: 100, 110, 115, 120, 200, 220, 230, or 240 V ac (±10 %). A rear panel decal

specifies the voltage selected prior to shipment. If a change in voltage is required, refer to

Section 4 of this manual for the selection procedure.

5220A

Instruction Manual

2-2

2-4. Fuse Replacement

2-5. AC Line Fuse

The ac line fuse is accessible by way of a rear-panel fuse holder located to the left of the

input power connector. If fuse replacement is required, disconnect the 5220A from line

power and remove the fuse cap and fuse (twist the fuse cap ccw using a screw driver).

Select and install a replacement fuse whose rating is compatible with the local line

voltage.

1. 100 to 120 V ac use fuse type MDA 3 A

2. 200 to 240 V ac use fuse type MDX 1.5 A

2-6. Power Supply Fuses

Each of the secondary windings on the power transformer is fused to protect the power

supplies from damage in the event of an overload. These fuses, six in all, are internal to

the 5220A and are not available to the operator. Details for replacement by qualified

personnel are given in Section 4 of this manual.

2-7. Rack Installation

The 5220A is designed for either bench-top use or for installation in a standard 19-inch

equipment rack using the accessory Rack Mounting Kit (John Fluke P/N M08-205-600).

Chassis slides (John Fluke P/N M00-280-610) can also be installed to facilitate access to

the instrument when it is installed in an equipment rack. Information regarding the

installation of the rack-mounting accessories is included in Section 6.

2-8. Operating Features

The function and location of all 5220A controls, indicators, and connectors are shown in

Figure 2-1 and described in Table 2-1.

Operating Instructions

Operating Features

2-3

ajs02f.wmf

Figure 2-1. Controls, Indicators, and Connectors

5220A

Instruction Manual

2-4

Table 2-1. Controls, Indicators, and Connectors

Ref.

No Name Function

1 STATUS Indicators Three LEDs that light on an individual basis to indicate that the 5220A

has exceeded an operating limit. When the limit condition is detected the

5220A is switched to the standby mode. When the limit condition is

cleared the LED will remain lit until the 5220A is commanded to the

operate mode. The three status conditions are as follows:

THERMAL CUTOFF: Indicates that the output stage of the 5220A has

exceeded its maximum operating temperature.

OVERCOMPLIANCE: Indicates that the compliance voltage at the output

terminals has exceeded its limit.

OVERCURRENT: Indicates that the output current has been

programmed beyond its upper limit.

2 CONTROL Switches

and Indicators

A series of pushbutton switches and LEDs used to select and indicate

the 5220A operating mode. The function of each is as follows:

OPR/STDBY Switch: Allows alternate selection of the standby and

operate modes.

INPUT Switch: Allows alternate selection of the front and rear input

connectors.

REMOTE Switch: Allows recall of the local mode when remote is

enabled and the LOCAL LOCKOUT LED is not lit.

OPR/STBY LEDs: One of the two is lit to indicate the current operating

mode, operate or standby.

FRONT/REAR LEDs: One is lit to indicate the selected voltage input

connector, front or rear.

REMOTE LED: Lights to indicate that the remote mode has been

remotely selected. If the LED is not lit the local mode is enabled.

LOCAL LOCKOUT LED: Lights to indicate that the unit has been

remotely locked in the remote mode. In this event, the three front panel

CONTROL switches are disabled.

3 POWER Switch A push-push switch used to switch instrument power on and off.

4 CURRENT OUTPUT

Terminals (Front)

A pair of banana-jack terminals used to provide front-panel connection to

the output of he current source. The terminals are inactive when the rear-

panel output terminals are selected.

5 VOLTAGE INGUT

Terminals (Front)

A pair of banana-jack terminals that serve as control voltage input

connections in the local/front-input mode.

6 MIS* Bus Connector A 24-pin connector used as an I/O port for remote operation (Fluke MIS

Bus) of the 5220A. When the 5220A is interfaced with a 5100 Series

Calibrator (by way of a Y5000 interface) the 5220A output can be

controlled from the 5100 front panel.

7 Ventilation Filter Prevents dirt and debris from being drawn into the 5220A intake

ventilation port.

Operating Instructions

Operating Notes

2-5

Table 2-1. Controls, Indicators, and Connectors (cont.)

Ref.

No Name Function

8 Power Connector Provides the means of connecting the 5220A to ac line power by way of

a 3-wire power cord.

9 Fuse Holder Houses the ac line fuse and allows easy access for fuse replacement.

10 Ground Connector A binding post positioned to provide a convenient connection to chassis

ground.

11 Current Output

Terminals (Rear)

A pair of banana-jack terminals used as rear-panel current output

connections. The terminals are inactive when the front-panel CURRENT

OUTPUT terminals are selected.

2-9. Operating Notes

The following paragraphs describe the various conditions that should be considered

before operating the 5220A.

2-10. AC Line Connection

The rear-panel three-prong, U-ground connector permits the 5220A to be connected,

through a power cord to 50 or 60 Hz line power. The offset prong on this connector is

connected to the 5220A chassis and should be connected, via the power cord, to a high-

quality earth ground.

2-11. Transconductance Amplifier

A transconductance amplifier is a current source whose output current level is

proportional to an analog input voltage. Electrically, the output of the unit appears as a

constant current source with an output impedance that is much greater than the load

resistance. Similarly, its input impedance is much greater than that of the input voltage

source.

The input/output ratio of the 5220A is 1:1, and the output current range is +20 to –20 A.

Therefore, the range of the input control voltage is +20 to –20 V dc. The compliance

voltage of the 5220A is 3 V rms ac or +4 V dc.

2-12. Input Voltage Requirements

Input control voltage for the 5220A can be supplied by any low-impedance voltage

source with an output proportional to the desired output current. The source may be either

ac (30 Hz to 1 kHz) or dc, fixed or adjustable, depending upon the output requirements.

The control voltage source may be connected to either the front-panel VOLTAGE

INPUT terminals or the rear-panel voltage input terminals (Pins 5 (low) and 6 (high) of

the 24-pin connector), but not both simultaneously. Instrument damage will not result

from the simultaneous connection of two sources. However, interaction between the two

inputs can result in source loading, which in turn can cause inaccuracy in the expected

current output level.

If a rear-panel input is desirable, the use of the 5100 Series Calibrator and a Y5000

Interface is recommended. This combination allows the 5220A to be operated remotely

as an extension of the 5100. If the use of an alternate rear-input source is desirable, the

user is responsible for the proper interface. Details for custom interface requirements can

be derived from the theory of operation (Section 3) and the detailed schematics (Section

8).

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Instruction Manual

2-6

2-13. Input Voltage Selection, Front/Rear

Selection of the front or rear terminals for control voltage input is manually accomplished

by pressing the INPUT push button switch on the front panel. Each depression alternately

selects front or rear as indicated by the lit FRONT/REAR LED indicator. This switch is

active in the local mode, and inactive in the remote mode.

2-14. Current Output, Front/Rear

The 5220A current output can be taken from either a front- or rear-panel set of five-way

binding post terminals, but not both simultaneously. An internal jumper configuration

allows qualified personnel to establish the desired output. A detailed output selection

procedure is given in Section 4, Maintenance.

2-15. Standby/Operate

When the 5220A is energized it can be placed into one-of-two operating modes; standby

or operate. The enabled mode is indicated by a lit front panel LED; OPR (operate) or

STDBY (standby). Standby is essentially a reset state, in which the output of the

transconductance amplifier is forced to zero regardless of the input control voltage level.

In the standby mode both the amplifier and the device connected to its output are

protected from accidental overloads. The operate mode is enabled when an output is

required. It causes the amplifier to respond to the control voltage input, and thereby

provides the appropriate current level output.

A front panel pushbutton switch (located between the OPR/STDBY LEDs) allows

manual selection of either mode when the LOCAL LOCKOUT LED is not lit. However,

the selection can be counteracted under certain conditions. For example, either mode may

be remotely selected, and the detection of an output overload will command the standby

mode. Similarly, when the unit is initially energized it is forced to standby.

2-16. Local/Remote

The 5220A can be operated manually using the front panel controls, or remotely by way

of the rear panel connector. When the unit is initially energized, it is forced to the local

control mode (REMOTE LED is not lit). The remote mode can only be selected by way

of a remote control source. When remote is enabled (REMOTE LED is lit) the local

mode can be recalled by a remote command or by pressing the LOCAL push-button

switch on the front panel. However, if the LOCAL LOCKOUT is lit (this is also a remote

command) the local mode can only be recalled by a remote command.

2-17. Status Indicators

A series of three front-panel STATUS LEDs provide a visual indication of overload

conditions that have been detected at the 5220A output. They are: THERMAL CUTOFF,

OVERCOMPLIANCE, and OVERCURRENT. When any one of these conditions is

detected the appropriate LED is lit and the unit is commanded to standby. The LED will

remain lit even after the overload condition has been relieved. To return the unit to the

operate mode the overload must be cleared and the operate mode must be commanded. If

operate is commanded while the overload is still present, the unit will remain in standby.

A thermal cutoff indication identifies overheating of the current output stage. If the

heating is excessive a cooling-down period may be required before the condition is

cleared.

The presence of an open-circuit or a high impedance load at the output terminals will

cause an overcompliance indication. In this case, an appropriate load will have to be

Operating Instructions

Operating Notes

2-7

connected to the output before the condition can be cleared. Overcompliance is detected

as an output voltage outside the range of +4 V dc or 3 V rms ac.

Output current in excess of 20 A will cause an overcurrent indication. To correct the

condition, the input control voltage must be reduced to an acceptable level.

2-18. Audible Output

When the 5220A is used to output high current at high frequencies (above 10 A and 1

kHz) it may emit an audible tone. The sound is normal and is characteristic of power

transistors that are operated at high current density. Several factors will cause the sound

to be more or less apparent. They include background noise, location of the 5220A

relative to the operator, and operator’s hearing ability.

2-19. Inductive Loads

The 5220A will drive an inductive load of up to 200 µH. However, reasonable care must

be exercised to ensure the desired results. One or more of the following considerations

may apply to a given application:

1. Compliance voltage (3.0 V maximum) places a restriction on the product of

inductance and operating frequency for a given output current. This is illustrated in

Figure 2-2 for maximum load inductance vs frequency at output currents of 5, 10,

and 20 A.

2. A step change in output current into an inductive load can easily produce an

overcompliance condition. If the control voltage is being input at the front panel

terminals, the rate of change must be controlled to avoid an overcompliance trip. An

alternate approach is to set the 5220A to standby before making a change in the

control voltage, then select the operate mode. This allows the 5220A to internally

control the rate of change. If the control voltage is taken from a Fluke Model 5100

Series Calibrator, the calibrator will limit its output to an acceptable rate of change.

3. The leads used to connect a load to the 5220A can add appreciably to load

inductance. For example, a pair of 5-foot leads (10 feet of wire) made of 18 gauge

wire (AWG) will have a calculated inductance of 3.86 µH. This is enough to cause an

overcompliance trip if a step change in the input control voltage occurs.

4. When driving an ac current through an inductive load the 5220A will exhibit

increased distortion and transconductance error. This is due to a reduction in loop

gain caused by the inductance. The graph in Figure 2-3 illustrates the typical

transconductance error, as a function of frequency, for two different inductive load

values.

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Instruction Manual

2-8

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Figure 2-2. Maximum Load Inductance vs Frequency

Operating Instructions

Operation

2-9

ajs04f.wmf

Figure 2-3. Typical Transconductance Error for Inductive Loads

2-20. Operation

The following procedure is suggested for operating the 5220A. With reference to the

previous paragraphs proceed as follows:

1. Connect the 5220A to the 5100 Series Calibrator via the Y5000 Interface if remote

operation is desired. See the 5100B/Y5000 Instruction Manuals for details.

2. Connect the 5220A to line power.

3. Turn-on the 5220A by depressing the POWER switch to the ON position. Only the

STDBY and FRONT indicators should be lit.

4. Energize peripheral equipment as required.

5. If local operation is required, connect the control voltage source to the front-panel

VOLTAGE INPUT terminals.

6. Adjust the output of the control voltage source (remote or local) to approximately

1 V.

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Instruction Manual

2-10

7. Determine the active output terminals (front or rear) by connecting a short jumper

wire between the front-panel CURRENT OUTPUT terminals and then pressing the

OPR/STDBY switch. If the OVERCOMPLIANCE LED lights, the rear output

terminals are active. Otherwise, the OPR LED will light indicating that the front

CURRENT OUTPUT terminals are active.

8. Press the STDBY switch and then remove the short from the front output terminals.

9. Connect the intended load between the active output terminals.

10. Adjust the control voltage to the desired level.

11. Command the operate mode. If the OPR LED is lit, the predetermined current level is

flowing through the load.

12. Set the unit to standby before disconnecting the load or setting the POWER switch to

OFF.

3-1

Section 3

Theory of Operation

3-1. Introduction

This section of the manual contains an overall functional description followed by a

detailed circuit analysis of the 5220A. Both descriptions are supported by block

diagrams. Component level descriptions contained in the circuit analysis are referenced to

the detailed schematics in Section 8 of this manual.

3-2. Overall Functional Description

3-3. General

The 5220A is a transconductance amplifier. That is, a current source whose output

current is proportional to an analog input voltage. Electrically viewed at the output

terminals, the 5220A appears as a current source with an output impedance that is very

much greater than the load resistance. Its input terminals exhibit a similar characteristic;

the input impedance is larger than that of the input voltage source.

Functionally, the 5220A, as shown in Figure 3-1, can be divided into two sections, analog

and digital. The analog section consists of the power supplies, the transconductance

amplifier, and associated analog control circuitry. The digital section comprises the logic

necessary for overall control, and the interfaces necessary for front panel (local)

operation and remote operation by way of the Fluke MIS Bus.

3-4. Analog Section

The power supply used in the 5220A provides operating voltages for both the analog and

the digital section of the unit. It consists of three separate assemblies: the A2 Transformer

Assembly, the A3 Cap Bus, and the A4 Regulator. The Cap Bus and Regulator

Assemblies comprise the output portion of the supply, while the Transformer Assembly

provides isolated ac power for the power supplies. Regulated supply voltages are a

function of the A4 Regulator. These include +5 V dc and +5 V dc Isolated for the digital

circuits and +15/-15 V dc for analog circuit operation. Unregulated voltages are a

function of the A3 Cap Bus. The Cap Bus is a high-current, +12/-12 V dc source for the

5220A current output.

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Instruction Manual

3-2

ajs05f.wmf

Figure 3-1. 5220A Functional Block Diagram

Theory of Operation

Overall Functional Description

3-3

The transconductance amplifier is a three-stage, closed-loop amplifier whose feedback

signal is proportional to the 5220A output (load) current. It consists of the A5 Preamp,

the A6 Driver, the A7 Output, and a precision four-terminal shunt. Input voltage to the

amplifier is presented, by way of front or rear input terminals, to the A5 Preamp. This

assembly includes relays for front/rear input selection, precision feedback resistors to

establish overall loop gain, and a high-gain amplifier equipped with on/off control for

power-on/off sequencing and failure control. The output of the A5 Preamp is input

directly to the A6 Driver where it is buffered and passed on as a differential input to the

high-current A7 Output stage. Output current from this stage is returned through the

output load and a precision current shunt to power supply common (COM 2) of the A3

Cap Bus (high-current supply). The voltage drop that occurs across the shunt is sent to

the A5 Preamp as a feedback signal, thus closing the loop.

Overall operation of the transconductance amplifier is illustrated in Figure 3-2. When an

input voltage, EIN, is applied to the amplifier an output current, IOUT, is produced. The

current passes through the series connected load and the precision shunt, RS. Current

passing through the shunt produces a voltage (IR) drop, EOUT, whose polarity (with

respect to COM 1) is opposite that of the input voltage. This voltage is returned to the

amplifier as negative feedback through resistor R2. The values of R1, R2 and RS

established the 1:1 ratio of input voltage to output current. See equations in Figure 3-2.

The analog control circuit constantly monitors the voltage and current outputs of the

transconductance amplifier and provides overcompliance and overcurrent indications to

the digital section of the 5220A. When an overload condition occurs, the digital section

responds by sending shut-down signals to the amplifier by way of the analog control

logic. Control sequencing signals (T1, T2) for amplifier turn-on are also processed by the

analog control circuit.

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Figure 3-2. Transconductance Amplifier Simplified Circuit Diagram

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Instruction Manual

3-4

3-5. Digital Section

The logic portion of the 5220A controls the sequencing of input relays (front/rear) and

other control signals that turn the transconductance amplifier on and off. It also provides

drive commands to light appropriate front panel status LEDs. Inputs to the logic are in the

form of local/remote control commands from the front panel switches or the remote MIS

Bus Interface, and overload signals from the analog control circuit.

Local or front panel control of the 5220A is accomplished through a series of front panel

pushbutton switches which provide direct inputs to the logic circuit. Control and/or status

responses to the commands are displayed on the front panel LEDs.

Remote control of the 5220A is enabled by the A11 MIS Bus Interface. The interface is

intended for use with a 5100 Series Calibrator equipped with a Y5000 Interface. Control

data (analog and digital) is received at the A11 MIS Bus Interface by way of a connector

on the rear panel of the 5220A. In the remote mode, this data is processed by the interface

and internally coupled with the analog and digital sections of the 5220A.

3-6. Circuit Analysis

A detailed circuit description of the 5220A is given in the following paragraphs. The

description is keyed to the functional blocks defined in Figure 3-1. Each block is

described separately and is supported by both a block diagram and a detailed schematic

diagram (see Section 8 for schematics).

3-7. Power Supply

The power supply, as shown in Figure 3-3, consists of the three major assemblies: A2

Transformer, A3 Cap Bus, and A4 Regulator. Its function is to transform line power into

four sets of 5220A operating voltages. Each voltage set is isolated from the other, and

three of the four are regulated. The three regulated voltage sets are +15/-15 V dc,

+5 V dc, and +5 V ISO (isolated). The unregulated voltage set is +12/-12 V dc.

The A2 Transformer assembly consists of a series of three line-voltage selection

switches, a power transformer, and appropriate secondary output fuses. Line power to the

transformer passes through the front panel power switch (S4) and the line voltage

selection switches before reaching the two primary windings. The setting of the line

voltage switches (S1) connects the primary windings in either a parallel or a series

configuration. Parallel connection is required for 115 V ac operation and the series

connection is used for 230 V ac. Switches S2 and S3 allow selection of alternate primary

winding taps. They allow operation from 100, 110, 115 or 120 V ac line voltages in the

parallel configuration, or from 200, 220, 230 or 240 V ac in the series configuration. The

115 V ac ventilation fan is permanently connected to one of the primary windings, thus

ensuring proper operation in either voltage configuration. Fuse protection for the power

line is provided by an external fuse (F1) mounted on the rear panel. Supply overload

protection for the regulated supplies is provided by secondary-winding fuses F4, F5, F6,

and F7 located on the A2 Transformer Assembly.

The A3 Cap Bus is a high-current, unregulated, +12/-12 V dc power supply designed to

provide operating power to the output amplifier. It consists of two fuses, a full-wave

rectifier, two bleeder resistors, and a bank of filter capacitors. Operating voltage is

derived from a high-current center-tapped secondary winding of T1. It enters the A3 Cap

Bus through overload fuses F2 and F3, and is full-wave rectified by diodes CR1 through

CR4 to establish both positive and negative supply voltages. Filter capacitors, C1 through

C8, filter the supply outputs. Bleeder resistors, R2 and R3, discharge the filter capacitors

when line power is turned off.

Theory of Operation

Circuit Analysis

3-5

The A4 Regulator is designed to convert the ac outputs from the three remaining

secondary windings of T1 into three sets of isolated and regulated voltages: +5 V dc,

+15/-15 V dc, and +5 V dc ISO (isolated). Each voltage is produced using conventional

regulating techniques. That is, it is rectified, filtered, regulated by a three-terminal

regulator, and filtered again before being output. A fifth voltage, Line Mon (monitor), is

also produced on the A4 Regulator. It is derived from the T1 windings used for the

+15/-15 V dc supply and is used to convey the line power status of the 5220A to the A10

Logic. The voltage is rectified by diodes CR8 and CR9, and clipped by zener VR1 before

being output.

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Figure 3-3. Power Supply Functional Block Diagram

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Instruction Manual

3-6

3-8. Preamplifier

The A5 Preamplifier, as shown in Figure 3-4, is a high-gain amplifier designed to accept

a front/rear panel input signal and provide an amplified output to the A6 Driver stage of

the transconductance amplifier. It consists of a high-gain differential amplifier with

feedback resistors, front/rear input select relays, and turn-on/off control circuitry.

In operation, the input voltage source (front or rear), as selected by the A10 Logic, is

connected through reed relay K1 (front) or K2 (rear) and input resistors R1, R3, and R13

to the inverting input of a differential transistor pair, Q2. The non-inverting input of Q2 is

connected to COM 1 through parallel resistors R9 and R14. The resistance value

approximates the value of R1 and R2 in parallel and, thereby balances the source

impedance at the amplifier inputs. Balance is required to minimize apparent input offset

voltage that may result from input currents. Diode CR3 and diode-connected transistor

Q3 are voltage clamps that prevent amplifier saturation on high input transients. The

collectors of Q2A and Q2B drive the emitters of a pair of grounded base amplifiers

formed by transistor array, U1. This holds the collectors of Q2 at a low and equal level to

maintain low and equal collector-to-base leakage currents (ICER) at Q2. The actual

collector voltage of Q2 is set by the temperature corrected divider formed by R4, R19,

and the diode connected transistor U1C. Voltage variations at the collectors of U1A and

U1B constitute the output of the differential amplifier, and are used as the input to op-

amp, U2. Diodes CR4 and CR5 clamp the inputs to prevent U2 saturation when transient

voltages appear. An ac feedback network, R15 and C7, fix the frequency response of the

preamplifier to satisfy the overall transconductance amplifier loop. Amplifier zero is

established by the selected values of collector resistors R11 and R12, and the setting of

the zero-adjust potentiometer, R6.

ajs09f.wmf

Figure 3-4. A5 Preamplifier Functional Block Diagram

The turn-on/off control FET (Q1) operates as FET switch to control the overall gain of

the A5 Preamplifier in both the standby and operate modes. Q1 responds to the FET

Drive 1 signal initiated (as T2) on the A10 Logic.

In the standby mode FET Drive 1 is near zero volts causing Q1 to turn on. FET Q1

completes the feedback loop between the output of U2 and the inverting input of Q2. This

in effect reduces the gain of the A5 Preamplifier to zero. As a result the output of the

transconductance amplifier is forced to zero amperes. Photo resistor U3 is used to control

Theory of Operation

Circuit Analysis

3-7

the rate at which the input voltage is applied to the A5 Preamplifier when the 5220A is

switched from standby to operate. This is necessary to prevent a step output which, if

applied to an inductive load, would result in an overvoltage transient, forcing the 5220A

back to standby. In standby both input select relays, K1 and K2, are open, capacitors, C3

and C12, are discharged, and the photo resistor U3 is a very high impedance with the

LED drive removed. Thus, the A5 Preamplifier is effectively isolated from the input

voltage.

In the operate mode FET Drive 1 is stepped to –15 V dc causing FET Q1 to turn off.

With Q1 off, the A5 Preamplifier returns to its high gain state with feedback established

by resistors R1 and R2. If front input is selected, the Relay 1 drive signal is low and

capacitor C12 begins charging. The increasing voltage across C12 increased the LED

output from U3 which, in turn, decreases the impedance of the photo resistor. Since the

resistor is in parallel with the input contacts of the still open front input relay K1, it acts

as a variable input attenuator. In other words, the front input voltage is applied to the

input of the A5 Preamplifier at a controlled rate and not as a step input. At the same time,

a low Relay 1 drive signal is inverted by U4 causing C3 to charge through R24. When the

charge reaches the threshold of the second inverter (U4) relay K1 is energized by a set of

four parallel connected inverters. The charge time for C3 and C12 are designed to ensure

that K1 closes after photo resister U3 changes to a low impedance. When K1 closes, it

places a short across the resistor in U3 and selects the front panel input voltage to drive

the A5 Preamplifier. If the rear panel input signal is selected, a variable attenuator is not

necessary because the signal from the remote 5100A rises at a controlled rate when

switched from standby to operate.

3-9. A6 Driver

The A6 Diver, as shown in Figure 3-5, is a differential amplifier designed to accept its

input from the A5 Preamplifier and to provide a differential drive signal to the A7 Output

stage. The amplifier itself is of a discrete-component, complementary, push-pull design.

Its features include the following:

• Temperature compensated biasing for both itself and the A7 Output stage

• An amplifier-disable circuit for standby operation

• An output-leakage current sink for standby operation.

The input section of the driver amplifier consists of a differential transistor pair, Q2 and

Q3; a current regulator, Q4; and a common base driver, Q1, for the bias circuit.

Transistor Q3 of the input pair receives the drive input from the A5 Preamplifier. The

other input transistor, Q2, is driven by Shunt Sense 2, which provides negative feedback

from the output current shunt to reduce distortion in the A7 Output stage. Current

regulator Q4 regulates the emitter current of the differential pair, and provides isolation

from variations in the –12 V supply. Output from the differential pair is taken at the

collector of Q3 by way of a common-base driver, Q1.

The bias section of the driver amplifier consists of resistors, R13 through R17, current

regulator, CR1, and transistors, Q5 and Q107 (Q107 is physically located on the output

amplifier's heat sink). Resistors R13 through R17 and current regulator CR1 form a series

string that is driven by the output driver Q1 of the input amplifier. Regulator CR1 is at

the end of the string and connected to –12 V dc. This ensures a constant current of

approximately 5.2 mA through the string. Transistors Q5 and Q107 are connected across

resistors R14, R15 and R16, R17 as VBE multipliers to ensure that the voltage drop

across the resistor string changes at a rate which will compensate for VBE temperature

changes in the A6 Driver and A7 Output stages. Transistor Q5 senses ambient

temperature changes while Q107 senses temperature changes due to power dissipation in

the A7 output. The temperature compensated voltage drop developed across the resistor

5220A

Instruction Manual

3-8

string is used as a voltage source to set the quiescent bias for the remaining stages of the

complementary A7 Driver and A7 Output. Variable resistor R13 is used to set the initial

bias voltage.

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Figure 3-5. A6 Driver Functional Block Diagram

The characteristics of the VBE multipliers used in the bias section are stated in terms of

Q5 in the following formulas:

VBE = [R14/R14 + R15] VCE

VCE = VBE [R14 + R15/R14]

The output section of the A6 Driver consists of transistors Q8, Q9, Q10, Q12, and

associated components. Transistors Q8 and Q9 are arranged as complementary emitter

followers that are both biased and driven by the bias section. This is followed by a

common collector stage using Q10 and Q12. Overcurrent protection is provided in the

stage by the 10 ohms resistors, R30 and R31, in the collector circuits. The differential

output at the emitters of Q10 and Q12 is used as the drive input to the A7 output stage.

In the standby mode of operation it is necessary to reduce the 5220A output to a zero-

volt/zero-current condition. This is accomplished on the A6 Driver by two separate FET

circuits. FETs Q6 and Q7 comprise the voltage shut-down circuit, and FET Q11 is the

output current-sink. Both are enabled by a Turn-on 1 signal which is initiated (as T1) by

the A10 Logic when the 5220A is switched to standby. When Q6 and Q7 are enabled

(turned on) they remove the bias from the output stage of the A6 Driver, and thereby

disable the bias to the A7 Output stage. In this state the output is essentially floating and

is influenced only by leakage current that may be present in the output drivers. FET Q11

remedies the floating condition by effectively clamping the output to output common

(COM 2).

Theory of Operation

Circuit Analysis

3-9

3-10. A7 Output

The A7 Output is a discrete-component, complementary-output, high-current amplifier

which serves as the final output stage of the transconductance amplifier. See Figure 3-6.

It consists of a pair of driver transistors, Q101 and Q102; two parallel pair(s) of output

transistors, Q103, Q104 and Q105, Q106; a thermal sensing transistor, Q107; and a

thermal overload switch S101. The differential output from the A6 Driver is applied to

the bases of Q101 and Q102. These transistors are configured as emitter followers and

provide the high current drive required by the output transistors. Collector resistors, R114

and R115, for Q101 and Q102 provide current limit protection under transient or fault

conditions. Emitter resistors in the parallel output pairs prevent current hogging which

would otherwise occur due to unequal VBE characteristics.

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Figure 3-6. A7 Output Functional Block Diagram

All transistors in the A7 Output as well as the thermostatic switch, S101, are physically

mounted on a common heat sink. The temperature of the heat sink is sensed by Q107

(part of the A7 Driver’s bias network) and returned to the A7 Driver to provide bias

compensation for the change in VBE with output-transistor temperature. (See A7 Driver

description given earlier in this section of the manual.) Thermostatic switch S101 senses

the temperature of the heat sink and provides an open contact output when an over-

temperature condition is detected. The open output is sent to the A10 Logic which reacts

by switching the 5220A to standby (over temperature may result from a loss or restriction

of cooling airflow).

5220A

Instruction Manual

3-10

3-11. A8 Analog Control

The A8 Analog Control Assembly, as shown in Figure 3-7, contains an overcompliance

detector, an overcurrent detector and two TTL-to-FET level shifters. The detection

circuits are used to switch the 5220A to standby when an overcurrent or overcompliance

condition occurs. The level shifters are driven by the A10 Logic to control the turn-on/off

sequencing of the transconductance amplifier.

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Figure 3-7. A8 Analog Control Simplified Block Diagram

The detection circuits are absolute value level detectors that provide a TTL output

indication of the transconductance amplifier’s operating status; i.e., output voltage status

and output current status. As long as both output voltage and current are within their

specified operating range, both detectors will output a low logic level as a normal-

operation status indication. However, if either or both the specified compliance voltage

and/or the output current are exceeded, the appropriate detector will output a high logic

level. Upon receipt of a high logic level from either detector the A10 Logic switches the

5220A to standby.

Each of the detectors is basically the same. They consist of an absolute value amplifier

(full-wave rectifier), a level conditioner, a zener diode threshold detector, and a TTL

buffered output stage. The absolute value amplifier is essentially a pair of operational

amplifiers configured to provide an output voltage that is equal to the amplified positive

absolute value of the input signal. The input to the compliance detector is connected to

sense the voltage present at the output terminals (+OUT and COM 1). Similarly, the input

to the overcurrent detector is connected to sense the voltage drop across the current shunt

(COM 2 and COM 1). The result, in both cases, is a negative output level that is equal to

the absolute value of the input signal. This level is sent to a level conditioner where it is

filtered/integrated, inverted, and amplified. An adjustable gain control in the level

conditioner’s feedback loop provides for accurate adjustment of the trip level.

The output of the level conditioner feeds a series connected zener/resistor circuit with the

resistor connected to logic common (COM 3). When the output of the level conditioner

exceeds the zener voltage, the excess is dropped across the zener resistor. This voltage is

monitored by a series-connected-pair of inverters which respond to the voltage drop as if

Theory of Operation

Circuit Analysis

3-11

it were a logic level. That is, voltages from 0 to an approximate 2 V threshold are

considered a low logic level. A high logic level is approximately 2 to 4.5 V.

The TTL-to-FET level shifters are used to interface turn on/off commands TTL logic

levels, T1 and T2, from the A10 Logic with the standby/operate control FETs in the

transconductance amplifier. Both level shifters are identical in design. The input is

designed to respond to voltage levels from +0.01 to +5.0 V dc. Corresponding output

levels to drive the FET gates are 0 to –15 V dc.

3-12. A9 Front Panel

The A9 Front Panel Assembly contains the switches (with the exception of the power

switch) and LEDs that comprise the 5220A controls and indicators. The switches are used

to manually convey control information to the A10 Logic. This includes selection of the

local operating mode, standby/operate, and front/rear panel input. The LEDs display the

current operating status of the 5220A as determined by the A10 Logic. Status conditions

include: remote, local lockout (LLO), overcompliance, overcurrent, thermal cutout, front

panel input, rear panel input, standby, and operate.

Electrically, the LEDs (anode end) and the switches (arm) are connected to a common +5

V bus powered by the logic supply. A switch depression represents a +5 V output to the

A10 Logic. A series resistor connected to the anode end of each LED serves as a current

limiter when the LED is lit. A low logic level from the A10 Logic lights the appropriate

LEDs.

3-13. A10 Logic

The A10 Logic, as shown in Figure 3-8, is designed to process and control the timing and

the input/output of all 5220A digital control data. Input data is received from the front

panel controls, the A11 MIS Bus Interface, and the analog protection circuits of the

transconductance amplifier. Output data provides timing and control signals to the

amplifier (including its relays) and the front panel indicator LEDs.

3-14. Reset Logic

The reset logic consists of dual multivibrator U11, RC network R7/C2, or gate U9-10,

and inverter U3-10. Its function is to command the reset of the A10 Logic, and thus the

5220A, to an initial state when any one of the following events occur:

1. The 5220A is initially energized.

2. The +15/-15 V dc power supply is interrupted.

3. Control is switched from remote to local.

When the 5220A is energized the +5 V dc power supply rapidly rises to its +5 V level to

supply operating voltage to the A10 Logic Assembly. The voltage rise is integrated by

RC network R7, C2. The slow rising voltage across C2 is used as a momentary low logic

level to issue a reset command to all sections of the A10 Logic. Some sections are reset

directly by the voltage across C2 while others are reset indirectly by the response of U11-

10 to the voltage across C2.

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Instruction Manual

3-12

ajs13f.wmf

Figure 3-8. A10 Logic Simplified Block Diagram

Loss or interruption of the +15/-15 V dc supply output causes the Line Mon (monitor)

input from the power supply to go low. Normally, the line monitor input is a clipped full-

wave rectified 60 Hz waveform which is generated on the A4 Regulator Assembly. The

negative-going edge is used as the trigger for monostable U11-7 which is timed to

provide an output pulse of approximately 0.1 second. Since the output is longer than the

time between triggers, it will remain active (Q low) as long as the Line Mon (monitor)

Theory of Operation

Circuit Analysis

3-13

input is present. Under normal operating condition the reset command is high at U9-10

and low at U3-10.

When the 5220A is switched from remote to local operation the local/remote logic

triggers monostable U11-10 in the reset logic circuit. The result is a momentary positive-

going pulse at the Q output of U11-10. This in turn drives the complementary reset lines

of U9-10 and U3-10.

The overall result of a reset command, regardless of how it is initiated, is to set the output

commands of the A10 Logic to the states shown in Table 3-1. Essentially the unit is

commanded to standby operation with front panel inputs selected. Remote and Local

Lockout (LLO) commands are not affected by the reset command.

Table 3-1. Effect of Reset Command on A10 Logic and A9 Front Panel

Signal Name Logic State Front Panel LED Status

Interface Operate Status Low None

Operate LED High OPER LED off

Standby LED Low STDBY LED on

T1, T2, and T4 Low None

Relay 1 High None

Relay 2 High None

Front Panel Input LED Low FRONT LED on

Rear Panel Input LED High FRONT LED OFF

Overcompliance LED High OVERCOMPLIANCE LED off

Overcurrent LED High OVERCURRENT LED off

Thermal Cutout LED High THERMAL CUTOFF LED off

Interface Overload Status Low None

3-15. Timing Logic

The timing logic controls the timing sequence used to switch the transconductance

amplifier between the standby and operate modes. It consists of a bi-directional shift

multivibrator runs at a frequency of 100 Hz (10 ms period) and serves as the clock for

both the flip-flop and the shift register. Flip-flop U17-1 responds to the Reset command

(reset input) and the standby/operate commands (D-input) to select the shift register’s

control mode; i.e., shift left or shift right. The shift register’s four outputs are sequenced

low in the shift-left mode and high in the shift-right mode. With all outputs low the

transconductance amplifier is set to standby. The amplifier is operational when all output

are high.

The shift-left mode is selected when flip-flop U17-1 drives the register’s S0 input low and

its S1 input high. (This occurs as the result of a standby or reset command.) In this mode

the register sequentially propagates the low input at U22-7 through the register causing

its four outputs (QA, QB, QC, and QD) to be sequentially driven low. Since the register

shifts at the rate of the 100 Hz clock, the outputs are sequenced at intervals of 10 ms. At

the end of four clock pulses all four outputs are low (standby), and will remain low until

the register is commanded to shift right.

5220A

Instruction Manual

3-14

The shift-right mode is selected when flop-flop U17-1 responds to an operate command

(D-input low) and drives the register’s S0 input high and the S1 input low. This results in

the high input at U22-2 being sequentially propagated through the register and its four

outputs (QD, QC, QB and QA) being driven high (operate).

The outputs of the shift register are used as control signals to sequence the turn-on and

turn-off of the transconductance amplifier. They are designated T1, T2, and T4 (T3 is not

used) and their sequence is shown in Figure 3-9. The control function of each of the

signals is as follows:

1. T1 turns the A6 Driver on and off.

2. T2 turns the A5 Preamplifier on and off.

3. T4 enables/disables the selected front/rear input relay (K1 or K2) on the A5

preamplifier.

ajs14f.wmf

Figure 3-9. Timing Sequence

3-16. Standby/Operate Logic

The standby/operate logic consists of optical isolators U1 and U5, monostable U8-7, D-

type flip-flop U10-9, and a series of supporting logic gates and buffers. Its function is

twofold. One, it responds to reset and external inputs to command the state of the timing

logic, shift left (standby mode) or shift right (operate). Two, it drives the front-panel

STANDBY/OPERATE LEDs and provides the A11 MIS Bus Interface (remote interface)

with an Interface Operate Status (Standby/Operate) signal. Flip-flop U10-9 is used to

store the commanded mode (standby or operate) and to provide the necessary commands

to the shift register (in the timing logic) and the LED/status drivers. Optical isolators U1

and U5 are used to electrically isolate remote control signals to and from the A11 MIS

Bus Interface from the A10 Logic.

Standby/operate commands occur in the form of Reset, Standby/Operate, not Operate,

Sw(itch) 1, Overcompliance, and Overcurrent. Reset is an onboard command from the

reset logic. It sets the 5220A to standby by commanding U10-9 to the clear state (Q low).

Standby/Operate is received in the form of a +5 V (high) input each time the front-panel

STANDBY/OPERATE switch is pressed. If the 5220A is in the local control mode, each

press of the switch will clock flip-flop U10-9 to its alternate state. The result is an

alternate selection of either the standby or the operate mode, as indicated by the front-

panel STANDBY and OPERATE LEDs. A similar command, Interface Operate Status

(also derived from the state of U10-9), is issued to the A11 MIS Bus Interface; low

Theory of Operation

Circuit Analysis

3-15

indicates standby, high indicates operate. The not Operate signal is received from the

A11 MIS Bus Interface and is effective only when the 5220A is in the remote control

mode. In the high state, the signal clears flip-flop U10-9 to invoke the standby mode.

When not Operate goes low it presets flip-flop U10-9 (by way of U8-7) to invoke the

operate mode. Overload signals received at the standby/operate logic include; Thermal

Sw(itch) 1, Overcompliance and Overcurrent. When any one of these signals goes high,

flip-flop u10-9 is cleared to the standby state.

3-17. Local/Remote Logic

The local/remote logic consists of optical isolators U4 and U20-8, monostable U8-9,

D-type flip-flop U7, and a series of supporting logic gates and buffers. Its function is to

enable selection of the desired control mode (local or remote) and to provide the drive for

the appropriate front panel and A11 MIS Bus Interface status indicators. These include

LLO (Local Lock Out) LED, Remote LED, and Interface Remote Status. Flip-flop U7 is

used to store the commanded mode (local or remote) and to provide the necessary

commands to the onboard logic and the LED/status drivers. Optical isolators U4 and

U20-8 electrically isolate remote control signals to and from the A11 MIS Bus Interface

from the A10 Logic.

Local/remote commands are received in the form of Local, not Remote, and not LLO

(Local Lockout). Local occurs as a momentary +5 V (high) input each time the front

panel LOCAL switch is pressed. If the 5220A is in the remote control mode and Local

Lockout is not commanded (high) pressing the front panel LOCAL switch will initiate a 1

µs pulse from monostable U8-9. This pulse clears flip-flop U7, which in turn, commands

the A10 Logic to the local mode (Rem Stat low). As a result, the Remote LED and LLO

LED signals are high, Interface Remote Status is low. However, if not LLO is low when

the LOCAL switch is pressed, monostable U8-9 will be held in the reset state and flip-

flop U7 will not be cleared. Thus, the A10 Logic is effectively locked into the remote

mode until not LLO is returned high.

The not Remote signal is received from the A11 MIS Bus Interface and is used to

remotely command the A10 Logic to the remote control mode. When the signal goes low

it is coupled across optical isolator U4 to the clock input of D-type flip-flop U7. This sets

the Q Output of U7 high to select the remote control mode (Rem Stat high). As a result,

the Remote LED signal goes low to light the REMOTE LED and the Interface Remote

Status output goes high.

When the 5220A is commanded to the remote mode the front-panel

STANDBY/OPERATE and FRONT/REAR switches are disabled and the corresponding

remote inputs are enabled. Similarly, if LLO is remotely enabled, the LOCAL pushbutton

is disable.

3-18. Front/Rear Input Logic

The front/rear input logic is used to command the front/rear input relays on the A5

Preamplifier and to drive the appropriate FRONT/REAR LED on the front panel. When

the A10 Logic is in the local mode, Front/Rear commands are received from the front

panel pushbutton. Each switch depression is received as a +5 V (high) level that is used

to clock alternate states on D-type flip-flop U10-5. The FRONT LED and Relay K1 are

commanded when the Q output of U10-5 is low. When the A10 Logic is in the remote

mode the not Rear input signal is used to command the front/rear input relays. Front input

is selected when not Rear is high. Actual opening/closing of the relays is enabled at time

T4 of the timing logic.

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Instruction Manual

3-16

3-19. Failure Status Logic

The failure status logic consists of three D-type flip-flop (U16-1, U16-13, and U17-13)

and their associated logic gates and drivers. Its function is to store failure conditions

detected by other parts of the A10 Logic and to drive the front panel STATUS indicators.

An optical isolator is also included for providing an Interface Overload Status signal to

the A11 MIS Bus Interface. Front panel status indicators comprise three LEDs:

OVERCOMPLIANCE, OVERCURRENT, and THERMAL CUTOUT. When any one of

these LEDs is lit, Interface Overload Status is driven high.

The inputs to the D-type flip-flop are connected to respond to three commands: reset,

clock, and set. The reset and clock inputs are used to set the Q outputs low, and thereby

remove the drive from the front panel STATUS LEDs. The three reset inputs are

connected in parallel and are commanded when the 5220A is initially energized and

when it is remotely commanded from standby to operate. The clock inputs are also

connected in parallel. They respond to a high input that transfers the low D-input to the Q

output. The clock is driven high under the following conditions:

1. When the STDBY/OPR pushbutton is pressed.

2. When the FRONT/REAR pushbutton is pressed.

3. When an onboard reset is initiated.

The set-inputs to the flip-flops in the failure status logic are used to set the Q outputs high

when a failure status is detected. This causes the corresponding STATUS LED to be lit

and the Interface Overload Status signal to go high. Each flip-flop responds to one of the

failure signals issued by the transconductance amplifier. They are:

1. Thermal Sw(itch) 1

2. Overcompliance

3. Overcurrent

3-20. A11 MIS Bus Interface

The A11 MIS Bus Interface, as shown in Figure 3-10, is a remote control interface that

allows the 5220A to operate as an extension of a 5100 Series Calibrator equipped with a

Model Y5000 Interface. An accessory cable is available for use with the Y5000 to

complete the necessary connections between the Y5000 and the A11 MIS Bus Interface.

Functionally, the A11 MIS Bus Interface (hereafter referred to as the MIS I/F) performs

three basic functions: receives and stores digital control data from a remote control

source (Y5000), interfaces 5220A status signals to the Y5000, and provides a connecting

path between the remote analog input signal (Aux Out) and the rear-input connections on

the A5 Preamplifier. Operating power for the assembly is derived from the +5 V ISO

(isolated) power supply.

Control data is received at the MIS I/F via the data bus as a 4-bit parallel word. When the

5100 Series Calibrator places the correct address on the address bus (BC0, BC3, and BC6

high), the write data logic responds by pulling the not ACK (acknowledge) line low and

clocking the control data word into the data register, U1. The not ACK signal is sent to

the 5100 to acknowledge the receipt of a valid address. The register outputs are buffered

and inverted by U6 before being used as remote programming inputs to the A10 Logic

PCB (i.e., not Remote, not Operate, not LLO and not Rear). At the same time that the

address is acknowledged, an RS flip-flop in the write data logic is set.

The function of the RS flip-flop is to prevent two successive status read inputs to the

5220A. The flip-flop is set when a high is present on inputs BC0, BC3, and BC6. This

results in a low output from U5-8 and a high output from U4-6. In this state gate U5-8 is

Theory of Operation

Circuit Analysis

3-17

enabled so that a status read can take place when BC0 and BC2 go high. Status read

causes the w/not R line to go low for the duration of the BC0 and BC2 inputs. At the end

of status read, the RS flop-flop is reset, closing the w/not R gate (U5-8) until it is

reopened by another programming input. This process is repeated every 16 ms because

the 5100 Series Calibrator refreshes the programming input to the 5220A at this rate.

Status information is received at the MIS I/F as three bits of parallel data (Remote Status,

Operate Status, and Overload Status) from the A10 Logic. When the 5100 Series

Calibrator places the correct address on the address bus (BC0 and BC2 high), the read

status logic responds by pulling the not ACK line low and gating the three status bits onto

the data bus. The not ACK signal is sent to the 5100 to acknowledge the receipt of a valid

address. At the same time the RS flip-flop in the read status logic is reset. This causes a

read command (W/nor R low) to be sent to the 5100 so that it can read the data bus. The

acknowledge output and the w/not R line will return high when the status address code is

removed from the address bus.

The analog output from the 5100 is passed through the Y5000 and the MIS I/F by way of

a two-wire (high, low) analog bus. The signal is routed directly from the MIS I/F to the

rear input connections on the A5 Preamplifier.

BDO-BD2

BCO, BC2

BCO, BC3, BC6

BDO-BC3

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Figure 3-10. A11 MIS Bus Interface

5220A

Instruction Manual

3-18

4-1

Section 4

Maintenance

4-1. Introduction

WWarning

These servicing instructions are for use by qualified personnel

only. To avoid electric shock, do not perform any servicing

other than that contained in the operation instructions unless

you are qualified to do so.

This section of the manual contains maintenance information for the Model 5220A

Transconductance Amplifier. The material is presented under the categories of shipping

information, general maintenance, performance test, calibration adjustments, and

troubleshooting. The performance test is recommended as an acceptance test when the

unit is first received, and later as a calibration procedure to verify the 180-day

specifications. Table 4-1 lists the equipment required for both the performance test and

calibration adjustments. If a recommended model is not available, an equivalent

instrument meeting the required characteristics can be substituted.

Table 4-1. Required Test Equipment

Equipment Type Required Specifications Recommended Type

DC and AC Voltage Calibrator 0 to 20 V dc ±0.002 % Fluke Model 5700A

Digital Multimeter 0 to 20 V dc ±0.002 %, Resolution: 1 µV HP3458A

Precision Shunt 0.01 Ω ±0.01 % dc, 0.035 % ac to 5 kHz Fluke Model Y5020

Load Resistor 0.01 Ω ±3 %, 50 W Dale RH-50

Load Resistor 0.01 Ω ±5 %, 10 W Dale RH-10

Distortion Analyzer Frequency range: 100 Hz to 5 kHz Sound Technology Model

1700A

Autotransformer Nominal line voltage ±10 %, 500 W General Radio Variac

5220A

Instruction Manual

4-2

4-2. Service Information

The 5220A is warranted for a period of 1-year upon delivery to the original purchaser.

The warranty is located on the back of the title page.

Factory authorized calibration and service for each Fluke product is available at various

worldwide locations. A complete list of these service centers is included in Section 7 of

this manual. If requested, an estimate will be provided to the customer before work is

begun on instruments that are beyond the warranty period.

4-3. General Maintenance

4-4. Cleaning

Clean the 5220A periodically to remove dust, grease, and other contamination. Use the

following procedure:

1. Clean the front panel and case with a soft cloth dampened with a mild solution of

detergent and water.

2. Clean the surface of the PCBs using clean, dry air at low pressure (<20 psi). If grease

is encountered, spray with Freon T.F. Degreaser and remove grime with dry, low-

pressure air.

4-5. Air Filter Maintenance

Periodically inspect the air filter on the rear panel for dirt and contaminants. If cleaning is

required, use the following procedure:

1. Disconnect the 5220A from line power.

2. Remove the two screws from the filter housing and gently pull the filter assembly

from the unit.

3. Clean the filter using either low-pressure air or a mild solution of detergent and

water.

4. Dry (if necessary) and reinstall the filter.

4-6. Access Information

The 5220A is a modular instrument that can be easily disassembled by sections.

Procedures for section disassembly are given in the following paragraphs. Some

procedures require the completion of previous procedures in the disassembly process.

When this occurs, the previous procedure will be referenced, but not repeated.

WWarning

To avoid electrical shock hazard, disconnect he 5220A from line

power before attempting any of the following disassembly

procedures.

Reassembly of the instrument is accomplished by logically reversing the disassembly

procedure. Before installing the top covers on the unit, make a visual comparison with

Figure 4-1 to ensure the presence of all assemblies, jumpers, and fuses.

Maintenance

General Maintenance

4-3

ajs15f.wmf

Figure 4-1. Internal Component/Assembly Locations

Caution

To prevent component damage observe static awareness

precautions during instrument disassembly/assembly. Refer to

the yellow insert sheet following Section 1.

5220A

Instruction Manual

4-4

4-7. Internal Components/Assemblies

All internal switches, fuses, and calibration adjustments can be accessed by removing the

top cover and the large inner cover from the 5220A. The location of each of the

applicable components is shown in Figure 4-1. Procedures for setting, replacing, and/or

adjusting these components are given later in this section of the manual.

4-8. Front Panel Removal

There are no electrical components physically mounted on the front panel of the 5220A.

Use the following procedure to remove the front panel:

1. Remove the top and bottom covers from the 5220A.

2. Stand the instrument on its rear handles. Use a solid work surface.

3. Locate the two tabs at the rear of each front handle and remove the tab screws (4

total).

4. Lift the front panel from the chassis.

4-9. A9 Front Panel PCB Removal

Use the following procedure to access and remove the A9 Front Panel PCB Assembly:

1. Remove the front panel.

2. Remove the two screws from the top of the A9 Front Panel PCB Assembly.

3. Pull the PCB from its connector (J10).

4-10. A2 Transformer Assembly Removal

Use the following procedure to remove the A2 Transformer Assembly from the 5220A:

1. Remove the top cover from the 5220A.

2. Remove the large inner cover.

3. Locate and remove the two screws that hold the A2 Transformer Assembly to the

chassis side.

4. Remove the two screws that hold the A2 Transformer Assembly to the Motherboard.

These screws are located on the bottom right-side of the transformer assembly (as

viewed from the top rear of the 5220A).

5. Remove the two hex screws that hold the top front of the transformer assembly to the

5220A front bulkhead.

6. Disconnect the three high-current transformer leads at the A3 Cap Bus Assembly.

Lug nuts hold the leads in place.

Note

When reassembling, the clear colored lead (center top) must be connected

to the terminal marked T. Connect one black lead to terminal S and the

other to terminal F.

7. Carefully lift the A2 Transformer Assembly from the 5220A.

Maintenance

General Maintenance

4-5

4-11. A6 Driver and A7 Output Assembly Removal

The A6 Driver and A7 Output PCB Assemblies comprise a plug-in assembly referred to

in this procedure as the A6 Driver/A7 Output. Use the following procedure to remove the

A6 Driver/A7 Output:

1. Remove the top cover from the 5220A.

2. Remove the large inner cover.

3. Remove the four screws from the sheet-metal portion of the A7 Output Assembly.

4. Remove the lug nuts holding the +12 and –12 V bus straps to the A3 Cap Bus.

5. Remove the front/rear output selection screws (jumpers).

6. Lift the A6 Driver/A7 Output from the chassis.

4-12. A3 Cap Bus Removal

To remove the A3 Cap Bus from the 5220A use the following procedure:

1. Remove the top and bottom covers from the 5220A.

2. Remove the top inner cover.

3. Remove both the front panel and the A9 Front Panel PCB Assembly.

4. Remove the A6 Driver/A7 Output Assembly.

5. Disconnect the transformer leads at the A3 Cap Bus.

6. Remove the two screws that secure the A3 Cap Bus ground strap to the motherboard.

7. Remove the nine screws holding the A3 Cap Bus to the front panel bulkhead.

8. On the A3 Cap Bus locate and the remove the two large-head screws located to the

side of resistors R2 and R5.

Caution

When these screws are installed they should be snug with the

PCB. However, they should not cause the PCB to bow.

9. Lift the A3 Cap Bus from the chassis.

Note

A heat-sink compound has been applied to the diode-end of the A3 Cap Bus.

Do not wipe off or otherwise remove this compound.

4-13. A12 Shunt Assembly Removal

Use the following procedure to remove the A12 Shunt Assembly:

1. Remove the top cover from the 5220A.

2. Remove both the large and small inner covers.

3. Remove the A8 Analog Control PCB Assembly from its connectors (J40).

4. Unplug the red-/black-lead connector next to J50 on the motherboard.

5. Locate the A12 Shunt Assembly (just in front of the fan) and remove the two screws

at the base of the assembly).

6. Carefully pull the A12 Shunt Assembly straight up while feeding the red-/black-leads

under the bulkhead. When the leads are free, remove the A12 Shunt Assembly from

the chassis.

Note

When reinstalling the shunt make sure that the red-/black-leads are plugged

into the motherboard; red lead to pin R, black lead to pin B.

5220A

Instruction Manual

4-6

4-14. Fuse Replacement

4-15. Ac Line Fuse

The ac line fuse is accessible by way of a rear-panel fuse holder located to the left of the

input power connector. If fuse replacement is required, disconnect the 5220A from line

power and remove the fuse cap and fuse (twist the fuse cap ccw using a screwdriver).

Select and install a replacement fuse whose rating is compatible with the local line

voltage.

• 100 to 120 V ac: Use fuse type MDA 3 A

• 220 to 240 V ac: Use fuse type MDX 1.5 A

4-16. Power Supply Fuses

There are six fuses located inside of the 5220A. Each is used to fuse one of the secondary

windings of the power transformer. Four of the fuses are located on the A2 Transformer

Assembly, and two are on the A3 Cap Bus. Their locations (F2 through F7) are shown in

Figure 4-1. Use the following procedure when replacement is necessary:

1. Disconnect the 5220A from line power.

2. Remove the top and large inner covers from the 5220A.

3. With reference to Figure 4-1, locate and inspect fuses F2 through F7. The fuses are

installed in fuse clips and can be pulled out using your fingers.

4. Replace defective fuses with the appropriate type and rating:

a. F2 and F3 are AGC 20 A fuses.

b. F4 through F7 are MDL 1/2 A fuses.

4-17. Line Voltage Selection

The 5220A is set at the factory to operate at a line voltage of either 115 or 230 V ac

+10%, 40 to 60 Hz. The selected voltage is identified on a rear panel decal. If your local

line voltage is not within this preset range, a suitable range may be selected by setting a

series of three switches (S1, S2, S3) on the A1 Transformer Assembly. Figure 4-2 shows

the switch locations as well as the switch settings for eight different line voltages. Use the

following procedure to set the line voltage switches:

1. Disconnect the 5220A from line power.

2. Remove both the top cover and the large inner cover from the 5220A.

3. With reference to Figure 4-2, locate and set switches S1, S2, and S3 to the positions

indicated for the desired line voltage.

4. Reinstall the top and inner covers.

Maintenance

General Maintenance

4-7

ajs16f.wmf

Figure 4-2. Line Voltage Selection

4-18. Output Terminal Selection, Front/Rear

Either the front or rear output terminals (but not both simultaneously) may be selected to

provide the current output connections. The active terminals are determined by the

position of a pair of screws that serve as output jumpers. See Figure 4-1 for the output

jumper (screw) locations. Installing the screws in the two holes marked FRONT enables

the front CURRENT OUTPUT terminals. Similarly, installing the screws in the two holes

marked REAR enables the rear output terminals. Use the following procedure to position

the screws:

5220A

Instruction Manual

4-8

Caution

To ensure proper instrument operation make sure that both

screws are installed and that they are both in either the FRONT

or REAR locations.

1. Disconnect the 5220A from line power.

2. Remove both the top and large inner covers from the 5220A.

3. Locate the output jumper screws as shown in Figure 4-1.

4. Install and secure the screws in the two FRONT or REAR holes, as desired.

5. Reinstall the top and inner covers.

4-19. Service Tools

The 5220A comes equipped with an extender board for servicing other 5220A PCB

assemblies. A storage slot for the board is provided in the 5220A PCB assemblies. See

Figure 4-1 for the storage location.

4-20. Performance Test

The following paragraphs comprise a performance verification test that compares the

instrument’s performance to the specifications given in Section 1 of this manual. The test

is recommended as an acceptance test when the unit is first received, and later as a

calibration procedure to verify instrument accuracy at the scheduled calibration periods.

It is also useful as an aid in troubleshooting.

Test equipment required for the performance test is listed earlier in Table 4-1. If the

recommended equipment is not available, comparable instruments with equivalent

specifications may be substituted. To ensure optimum results, the test must be performed

at an ambient temperature of 22 to 24 degrees Celsius, with a relative humidity of less

than 85 %. Also the instrument should be allowed to warm up for at least 30 minutes

before starting the performance test.

If the instrument does not meet the performance test, troubleshooting, repair, and/or

calibration adjustment is indicated. Procedures for calibration adjustment and

troubleshooting are given later in this section of the manual.

4-21. Initial Conditions

Before starting the following procedures, condition the 5220A as follows:

1. Disconnect all input, output, and remote connections at the 5220A.

2. Install the top, bottom and inner covers if they have been removed.

3. Connect the unit to line power through an autotransformer set for the proper line

voltage, and set the POWER switch to ON. Only the STANDBY and FRONT LEDs

should light.

4. Allow the 5220A to warm up for at least 30 minutes before proceeding.

Maintenance

Performance Test

4-9

4-22. Front Panel Tests

Use the following procedure to check the operation of the 5220A front-panel controls and

LEDs:

1. With the unit in the standby mode, connect jumper wires between the enabled

(front/rear) output terminals. Use a 4-inch length of 16-gauge insulated wire.

2. Press the OPR/STDBY pushbutton. The OPR LED should light and the STDBY LED

should go out.

3. Press the INPUT pushbutton to select the rear input.

4. Return input control to the front panel by pressing the INPUT pushbutton. The

FRONT LED should light and the REAR LED should go out.

5. Remove the jumper wire from the output terminals. The unit should switch to the

standby mode and the OVERCOMPLIANCE LED should light.

6. Reinstall the jumper wire at the output terminals.

7. Clear the overcompliance condition by pressing the OPR/STDBY switch. Set the unit

to the operate mode.

Caution

The THERMAL CUTOFF LED will light only when the output

stage of the 5220A is overheated. This is a failure mode that

should not be invoked for test purposes. The LOCAL

pushbutton and the REMOTE, LOCAL LOCK OUT LEDs are

remote control features that require remote commands for

operation.

4-23. Zero Output

The following procedure checks the zero output of the 5220A in both the standby and

operate modes:

1. Connect the load resistor (0.1 ohm) to the enabled (front/rear) output terminals.

2. Connect the DVM to the sense terminals on the load resistor and select the 100 mV

dc range.

3. With the 5220A in the standby mode, read the voltage drop across the load resistor.

The reading should be 0 +/-5 µV dc.

4. Connect a short jumper wire between the front VOLTAGE INPUT terminals.

5. Set the 5220A to the operate mode. The OPERATE LED should be on and the

STANDBY LED off.

6. Read the output voltage on the DVM. It should be 0 +/-100 µV dc.

7. Set the 5220A to standby and remove the jumper wire from the VOLTAGE INPUT

terminals.

8. Disconnect the load resistor from the output terminals on the 5220A.

5220A

Instruction Manual

4-10

4-24. DC Accuracy and Line Regulation

The following procedure is used to check the dc accuracy of the 5220A output current:

1. Connect the precision shunt to the enabled output terminals on the 5220A.

2. Connect the DVM to the sense terminals on the precision shunt. Observe polarity.

3. Set the DVM to the 200 mV dc range.

4. Connect the output of the dc voltage calibrator to the VOLTAGE INPUT terminals

on the 5220A; positive to red, negative to black.

5. Set the dc voltage calibrator to the output shown in step 1 of Table 4-2 (+10.0000 V

dc).

6. Set the 5220A to the operate mode.

7. Using the DVM reading and the calibrated shunt valve, calculate the output current

(I = E/R). The calculated value should be within the limits shown in the table.

8. Vary the line voltage +10 % from nominal and verify a less than 0.001 % change in

output current.

9. Sequentially set the calibrator output to the voltages shown in steps 2 and 3 of Table

4-2. At each voltage setting verify the 5220A output accuracy by repeating step 7 of

this procedure.

10. Set the 5220A to the standby mode.

11. Set the dc voltage calibrator output to zero volts and disconnect it from the 5220A.

12. Disconnect the precision shunt from the 5220A output terminals.

Table 4-2. DC Accuracy Test

Step DC Calibrator Output (V dc) Calculated Output Current (Amps)

1 +10.0000 +9.9965 to +10.0035

2 +20.0000 +19.9940 to +20.0060

3 -10.0000 -10.0035 to –0.0065

4-25. Harmonic Distortion

This procedure is used to measure the harmonic distortion present at the output of the

5220A.

1. Set the output of the ac voltage calibrator to zero and connect it to the 5220A

VOLTAGE INPUT terminals.

2. Connect the load resistor (0.1 ohms) to the enabled (front/rear) output terminals.

3. Connect the distortion analyzer to load resistor sense terminals.

4. Set the ac voltage calibrator output to 20 V rms at 1 kHz.

5. Set the 5220A to the operate mode.

6. Measure the output distortion on the distortion analyzer. It should be less than or

equal to 0.075 %.

Note

Do not use input filters when making this measurement.

Maintenance

Performance Test

4-11

7. Set the 5220A to the standby mode.

8. Disconnect the load resistor and the distortion analyzer from the 5220A output

terminals.

4-26. Frequency Response

Note

When high ac currents at high frequencies are being used, and

minimization of inductive coupling is required, it is recommended that you

twist the current carrying leads between the 5220A and load. Also, any

measuring instruments used with the load should be kept at least eighteen

inches away the load to prevent radiation from affecting its reading.

The frequency response of the 5220A is checked using the following procedure:

1. Connect the precision shunt (.01 ohm) to the enabled (front/rear) output terminals.

2. Connect the true rms voltmeter to the sense terminals on the precision shunt.

3. Set the ac voltage calibrator output to the voltage and frequency shown in step 1 of

Table 4-3 (20.0000 V @ 100 Hz).

4. Set the 5220A to the operate mode.

5. Read the true rms voltmeter and calculate the current. It should indicate a current

within the limits shown for step 1.

6. Sequentially set the calibrator output to each of the frequencies shown in steps 2

through 5 of Table 4-3. At each frequency verify that the measured current is within

the limits given for that step.

7. Set the 5220A to the standby mode.

8. Disconnect the precision shunt from the 5220A output terminals.

Table 4-3. Frequency Response Test

Step AC Voltage Calibrator Output (V rms) Measured Output Current (Amps)

1 20 V @ 100 Hz 19.970 to 20.030*

2 20 V @ 300 Hz Reading 1 ±0.05 %

3 20 V @ 1 kHz Reading 1 ±0.05 %

4 20 V @ 3 kHz Reading 1 ±0.15 %

5 20 V @ 5 kHz Reading 1 ±0.25 %

* Includes limit of errors:

1. 5220A 2. 5200A 3. Y5020 4. 931A

4-27. Overcurrent Trip Test

The following procedure will verify the accuracy of the overcurrent trip setting on the

5220A:

1. Connect the load resistor (0.1 ohm) to the enabled (front/rear) output terminals.

2. Set the output of the ac voltage calibrator to 20.0000 V rms.

3. Set the 5220A to the operate mode.

5220A

Instruction Manual

4-12

4. Increase the ac voltage calibrator output in 1.0V rms increments. The 5220A should

switch to the standby mode at between 20.0 and 24.0 V rms. The OVERCURRENT

LED should also light.

5. Set the ac voltage calibrator output to zero volts.

6. Disconnect the load resistor from the 5220A output terminals.

4-28. Overvoltage Trip Test

The following procedure is used to check the overvoltage trip setting on the 5220A:

1. Connect a 1 ohm ±5 %, 10 W resistor (Dale RH-10) to the enabled (front/rear) output

terminals on the 5220A.

2. Set the output of the 5220A to 3.0000 V rms.

3. Set the 5220A to the operate mode.

4. Increase the ac voltage calibrator output in 0.1 V rms increments. The 5220A should

switch to the standby mode with an input of 3.1 to 3.5 V rms. The OVERVOLTAGE

LED should also light.

5. Set the ac voltage calibrator output to zero volts and disconnect the unit from the

5220A.

6. Remove the 1 ohm, 10 W resistor from the 5220A output terminals.

7. Set the 5220A POWER switch to OFF.

4-29. Calibration Adjustments

The calibration adjustment procedures given in the following paragraphs should be

performed after repair of the 5220A and/or when the unit fails the performance-test

requirements. If the unit will not respond to, or meet the limits of the adjustment

procedures, troubleshooting and repair is indicated. Equipment required for the

calibration adjustments is listed earlier in Table 4-1.

All calibration adjustments are accessible when the top and large inner covers are

removed from the 5220A. Figure 4-1 identifies the location of the assemblies, test points,

and adjustments that must be accessed to complete the calibration adjustment procedures.

To ensure optimum results, the calibration adjustments must be performed at an ambient

temperature of 22 to 24 degrees Celsius, with a relative humidity of less than 85 %. Also

the unit should be allowed to warmup in the operate mode (with the top cover in place)

for at least 30 minutes before starting the adjustment procedures.

Maintenance

Calibration Adjustments

4-13

4-30. Initial Conditions

Before starting the following procedures, condition the 5220A as follows:

1. Disconnect all input and remote connections to the 5220A, and connect a short

jumper wire between the selected output terminals.

2. Connect the unit to line power and set the POWER switch to ON. Only the STDBY

and FRONT LEDs should light.

3. Set the 5220A to the operate mode and allow it to warmup for at least 30 minutes.

4. Remove the top and large inner cover from the unit, and complete the following

procedures.

4-31. Input Offset Adjustment

The following procedure is used to adjust input offset (R6) on the A5 Preamplifier PCB

Assembly:

1. Connect the load resistor (0.1 ohm) to the enabled (front/rear) 5220A output

terminals.

2. Connect the DVM to the sense terminals on the load resistor and select the 100 mV

dc range.

3. Connect a short jumper wire between the front VOLTAGE INPUT terminals.

4. Set the 5220A to the operate mode.

5. Adjust R6 on the A5 Preamplifier PCB Assembly for a DVM reading of -.010 to -

.010 mV dc (0 +10 µV dc).

6. Set the 5220A to the standby mode.

4-32. Driver Offset Adjustment

The following procedure is used to adjust input offset (R6) on the A6 Driver PCB

Assembly. The procedure is accomplished with the 5220A in the standby mode:

1. Jumper test lead between TP7 (-15 V dc) on the A4 Regulator and TP4 (Turn on 1)

on the A8 Analog Control. This enables the A8 Analog Control and A7 Output while

the A5 Preamplifier is clamped to zero (standby).

2. Adjust R6 on the A6 Driver for a DVM reading of -1.000 to +1.000 mV dc.

3. Disconnect the test lead from TP4 and TP7.

4. Remove the load resistor from the 5220A output terminals.

5. Remove the jumper wire from the front-panel VOLTAGE INPUT terminals.

5220A

Instruction Manual

4-14

4-33. Output Bias Adjustment

This procedure is used to adjust the bias current for both the A6 Driver and the A7

Output. The bias adjustment (R13) is located on the A6 Driver PCB Assembly.

1. Connect the ac voltage calibrator to the front-panel VOLTAGE INPUT terminals on

the 5220A.

2. Connect the load resistor (.1 ohm) to the enabled output terminals on the 5220A.

3. Connect the distortion analyzer input to the sense terminals on the load resistor.

4. Set the ac voltage calibrator for a 20 V rms, 1 kHz output.

5. Set the 5220A to the operate mode.

6. Measure the distortion and adjust R13 for a minimum indication. At the final setting,

distortion should measure less than 0.04 %.

7. Set the 5220A to the standby mode.

8. Disconnect the distortion analyzer and the load resistor from the 5220A.

4-34. DC Accuracy Adjustment

This procedure is used to adjust R3 on the A5 Preamplifier PCB Assembly. This

adjustment controls the accuracy of the dc output current.

1. Connect the precision shunt (.01 ohm) to the enabled output terminals on the 5220A.

2. Connect the DVM to the sense terminals on the precision shunt. Observe polarity.

3. Connect the output of the dc voltage calibrator to the VOLTAGE INPUT terminals

on the 5220A; positive to red, negative to black.

4. Set the dc voltage calibrator for an output of +10.0000 V dc.

5. Set the 5220A to the operate mode.

6. Adjust R3 on the A5 Preamplifier for a voltage reading in millivolts that is 10 times

the calibrated value of the precision shunt in milliohms. The adjustment should be

within +0.002 mV dc of the calculated value. For example: if the calibrated value of

the shunt is 0.0100253, adjust R3 for a DVM reading of .100253 V dc or 100.253

+0.002 mV dc.

7. Set the 5220A to the standby mode.

8. Disconnect both the dc voltage calibrator and the precision shunt from the 5220A.

4-35. Frequency Response

The following procedure is used to adjust the frequency response of the 5220A. The

adjustment is made at C4 on the A5 Preamplifier PCB Assembly.

1. Connect the precision shunt to the enabled output terminals on the 5220A.

2. Connect the true rms voltmeter to the sense terminals on the precision shunt.

3. Set the output of the ac voltage calibrator to 10 V rms, 1 kHz.

4. Set the 5220A to the operate mode.

5. Note the reading on the rms voltmeter.

6. Change the frequency of the calibrator output to 5 kHz.

7. Adjust trimmer capacitor C4 on the A5 Preamplifier PCB to obtain the same reading

on the rms voltmeter as that noted in step 5.

Maintenance

Replacement of Selected Components

4-15

8. Set the 5220A to the standby mode.

9. Disconnect the shunt and voltmeter from the 5220A output terminals.

4-36. Overcurrent Adjustment

This procedure is used to adjust the overcurrent trip level of the 5220A. The overcurrent

adjustment (R21) is located on the A8 Analog Control PCB Assembly.

1. Connect the load resistor (0.1 ohm) to the enabled output terminals on the 5220A.

2. Set the calibrator output to 23.5 V rms, 50 Hz.

3. Set the 5220A to the operate mode. If the unit switches back to standby, turn R21 (on

the A8 Analog Control PCB Assembly) counterclockwise until the operate mode can

be enabled.

4. Adjust R21 clockwise until the 5220A switches to the standby mode. Both the

STDBY and OVERCURRENT LEDs should light.

5. Disconnect the 0.1 ohm load resistor from the 5220A output terminals.

4-37. Overvoltage Adjustment

This procedure is used to adjust the overvoltage trip level for the 5220A. The overvoltage

adjustment (R9) is located on the A8 Analog Control PCB Assembly.

1. Connect the 1 ohm load resistor to the enabled output terminals on the 5220A.

2. Set the ac voltage calibrator output for 3.3 V rms, 50 Hz.

3. Set the 5220A to the operate mode. If the unit switches back to standby, turn R9 (on

the A8 Analog Control PCB Assembly) counterclockwise until the operate mode can

be enabled.

4. Adjust R9 clockwise until the 5220A switches to the standby mode. Both the STDBY

and OVERCOMPLIANCE LEDs should light.

5. Disconnect the load resistor and the ac voltage calibrator from the 5220A.

6. Set the 5220A POWER switch to OFF.

7. Disconnect the unit from line power.

8. Install the inner cover and top cover on the 5220A.

4-38. Replacement of Selected Components

The A5 Preamplifier PCB Assembly contains a series of three selected parts that may

have to be changed after repairs have been made on the PCB. All three selected parts are

resistors. Two (R11, R12) are associated with the Input Offset Adjustment (R6); the third

(R13) affects the DC Accuracy Adjustment (R3). Resistors R11 and R12 are selected to

place R6 at approximately midrange when it is properly adjusted. Resistor R13 is selected

to accomplish the same thing for R3. When the travel of either R3 or R6 limits proper

adjustment, the associated selected resistor(s) should be replaced. Follow the appropriate

procedure for parts selection.

5220A

Instruction Manual

4-16

4-39. Resistors R11 and R12

Resistors R11 and R12 are associated with the Input Offset Adjustment procedure and the

setting of the ZERO ADJ potentiometer R6. Use the following procedure to select the

proper replacements for R11 and R12:

1. Disconnect the 5220A from line power.

2. Remove the top and large inner covers from the unit.

3. Remove the two fuses (F1 and F2) from the A3 Cap Bus PCB Assembly.

4. Mount the A5 Preamplifier PCB Assembly on the extender board and install jumper

wires on the PCB at the following points:

a. TP1 to TP5

b. TP3 to TP4

c. Short across R11

d. Short across R12

5. Disconnect the red and black Current Shunt sense lead from the motherboard

(connections are located near the A5 Preamplifier connector). On A8 the Analog

Control, short TP9 to TP13 to prevent a false overcurrent trip.

6. Set the digital voltmeter to the 100 mV dc range and connect its input to TP4(+) and

TP5(-) on the A5 Preamplifier PCB Assembly.

7. Adjust R6 on the A5 Preamplifier to the full ccw (counterclockwise) position.

8. Connect the 5220A to line power and set the POWER switch to ON.

9. Select the operate mode using the STDBY/OPR switch.

10. Note the DVM reading. It should read within the range of +/-1.300 mV dc.

11. Adjust R6 on the A5 Preamplifier PCB to the full cw (clockwise) position and note

the reading. The DVM reading should increase in a positive direction.

12. Calculate the difference between the DVM readings taken in steps 10 and 11. The

difference should be 350 µV +/- 70 µV dc.

13. Determine the average reading of steps 10 and 11 and adjust R6 for that reading on

the DVM. Then perform step a, b, or c as required:

a. If the DVM reading is within the range of +/-0.087 mV dc, replace both R11 and

R12 with shorting wires (0 Ω).

b. If the DVM reading is negative, refer to Table 4-4, and replace R12 with the

appropriate resistor. Replace R11 with a shorting wire.

c. If the DVM reading is positive, refer to Table 4-4 and replace R11 with the

appropriate resistor. Replace R12 with a shorting wire.

14. Set the POWER switch to OFF and disconnect the 5220A from line power.

15. Install the two fuses (F1 and F2) on the A3 Cap Bus PCB Assembly.

16. Remove the jumpers from TP1-TP5 and TP3-TP4.

17. Disconnect the DVM from TP4 and TP5.

18. Remove the A5 Preamplifier PCB from the extender board.

19. Reconnect the red and black current shunt sense leads to the motherboard.

20. Install the A5 Preamplifier PCB Assembly in its slot.

21. Perform the Calibration Adjustment procedures.

Maintenance

Replacement of Selected Components

4-17

Table 4-4. Replacement Resistors for R11 and R12

DVM Reading (±mV dc) Selected Value for R11/R12 Fluke Part Number

0.87 to 0.174 1.00 kΩ168229

0.175 to 0.261 2.00 kΩ235226

0.262 to 0.348 3.01 kΩ312645

0.349 to 0.435 4.02 kΩ235325

0.436 to 0.522 4.99 kΩ168252

0.523 to 0.609 6.04 kΩ285189

0.610 to 0.696 6.98 kΩ261685

0.697 to 0.783 8.06 kΩ347229

4-40. Resistor R13

Resistor R13 is associated with the DC Accuracy Adjustment procedure and the setting

of the GAIN ADJ potentiometer R3. Use the following procedure to select the proper

replacement for R13:

1. Disconnect the 5220A from line power.

2. Remove the top and large inner covers from the unit.

3. Connect the precision shunt (.01 ohm) to the enabled output terminals of the 5220A.

4. Connect the DVM to the sense terminals on the precision shunt; observe polarity. Set

the DVM to the 100 mV range and zero the display +/-.001 mV.

5. Connect the output of the dc voltage calibrator to the VOLTAGE INPUT terminals

on the 5220A; positive to red, negative to black.

6. Adjust R3 on the A5 Preamplifier to its full cw limit.

7. Install a shorting wire across R13 on the A5 Preamplifier PCB Assembly.

8. Connect the 5220A to line power and set the POWER switch to ON.

9. Set the calibrator for an output of +10.0000 V dc.

10. Set the 5220A to the operate mode.

11. Determine the actual value of the precision shunt (calibrated value) and subtract it

from .01 ohms. Multiply this difference by 10,000 and record the result.

12. Record the displayed DVM reading in mV and add the result of step 11 from the

reading. Use this corrected DVM reading in conjunction with Table 4-5, to select the

value of R13.

For example:

Given: Shunt Value = .0100123 Ω

DVM Reading = 101.041 mV dc

Corrected DVM Reading = 101.041 + 10000 (.01-.010012)

Corrected DVM Reading = 100.918 mV dc

R13 = 698 ohms (see Table 4-5.)

13. Set the POWER switch on the 5220A to OFF and replace R13 on the A5 Preamplifier

PCB with the selected value.

14. Perform the Calibration Adjustment procedures.

5220A

Instruction Manual

4-18

Table 4-5. Replacement Resistors for R13

Corrected DVM Indication (mV dc) Selected Value for R13 (Ω) Fluke Part Number

102.000 to 101.800 1740 Ω357756

101.800 to 101.600 1500 Ω376947

101.600 to 101.400 1282 Ω330472

101.400 to 101.200 1100 Ω347161

101.200 to 101.000 900 Ω460519

101.000 to 100.800 698 Ω289330

100.800 to 100.600 499 Ω289256

100.600 to 100.400 301 Ω289173

100.400 to 100.200 100 Ω357400

100.200 to 100.000 0 ΩNA

4-41. Troubleshooting

hCaution

Static discharge can damage MOS components contained in

the 5220A. To prevent this possibility use the following

precautions when troubleshooting and/or repairing the unit.

• Never remove, install, or otherwise connect, or disconnect PCBs and/or components

without disconnecting, the unit from line power.

• Perform all repairs at a static-free work station.

• Do not handle ICs or PCBs by their connectors.

• Use static ground straps to discharge repair personnel.

• Use conductive foam to store replacement or removed ICs.

• Remove all plastic, vinyl, and Styrofoam products from the work area.

• Use a grounded soldering iron.

A troubleshooting guide for the 5220A is given in Table 4-4 and 4-5. The guide is in the

form of a tabular flow chart and is recommended for use in isolating a mainframe

malfunction to the PCB (board) level. Details necessary to troubleshoot faulty PCBs to

the component level can be derived from the schematic diagrams given in Section 8, and

the theory of operation in Section 3.

When using the troubleshooting guides, the following notes apply:

• Do not start in the middle of the procedure. Any given step assumes that the previous

steps have been completed. Complete Table 4-4 before going on to Table 4-5.

• All measurements using external test equipment are made at test points on the various

PCB assemblies. See Figure 4-3 for test point location/identification.

Maintenance

Troubleshooting

4-19

ajs17f.wmf

Figure 4-3. Test Point Location/Identification

5220A

Instruction Manual

4-20

ajs18f.wmf

Figure 4-4. Flowchart Summary of Mainframe and Digital Section

Troubleshooting Guide

Maintenance

Troubleshooting

4-21

Table 4-6. Mainframe and Digital Section Troubleshooting Guide

Step Instruction Yes No Go to

1 Set the 5220A POWER switch to OFF and disconnect the unit from line

power.

2 Remove the top cover and the large inner cover from the 5220A. 3

3 Visually inspect the internal fuses (F2 through F7) and replace as

required.

4 Connect a shorting jumper between the front panel VOLTAGE INPUT

terminals.

5 Check to ensure that all PCB assemblies are securely installed in the

correct locations. See Figure 4-1.

6 Determine the enabled output terminals by visually identifying the

position of the front/rear output jumper screws. Tighten these screws if

they are loose.

7 Connect a shorting jumper between the enabled output terminals. 8

8 Connect the 5220A to line power and set the POWER switch to ON. 9

9 Is the fan running? 13 10

10 Are any of the front panel LEDs lit? 11 12

11 Loose fan connections or defective fan. Repair as required. 8

12 Check the line power fuse and replace if necessary. If fuse continues to

blow, locate short in input power circuit/transformer assembly. Check

the position of the line voltage switches on the transformer assembly.

Using a dc voltmeter, verify the presence of all power supply voltages

at the A4 Regulator PCB and the A3 Cap Bus. Test points are provided

on the A4 Regulator PCB. Measure the A3 Cap Bus outputs (±12 V dc)

at the bus bar terminals on that assembly with respect to COM 2 (the

ground plane on top of the A3 Cap Bus PCB).

Voltage Test Points Limits

Hi Lo

A4 Regulator

+15 V 3 5 +14.4 V to +15.6 V dc

-15 V 7 5 -15.6 V to –14.4 V dc

+5 V ISO 1 2 +4.8 V to +5.2 V dc

+5 V 6 4 +4.8 V to +5.2 V dc

A3 Cap Bus

+12 V - - +10.5 V to +13.5 V dc

- 12 V - - -12.5 V to –10.5 V dc

14 Are all voltages within limits? 16 15

5220A

Instruction Manual

4-22

Table 4-6. Mainframe and Digital Section Troubleshooting Guide (cont.)

Step Instruction Yes No Go to

15 Check the line voltage switch settings on A2 Transformer

Assembly. They should be set to comply with the local line

voltage. If some voltages are in limits and some are out, the

problem is on the A4 Regulator or the A3 Cap Bus. If a voltage is

low, check for power supply loading. If a voltage is high, the

regulator IC is likely the cause.

Front Panel Tests

16 Complete the Front Panel Tests described earlier under

Performance Test.

17 Does the 5220A respond as described in the Front Panel Tests?

18 Do one or more LEDs light? 20 19

19 Operating voltage (+5 V dc) is not present at either the A9 Front

Panel PCB or the A10 Logic PCB. Repair as required.

20 Can the standby/operate modes be selected?

Note

The jumper wire must be installed between the

enabled output terminals.

21 Is the OVERCURRENT or OVERCOMPLIANCE LED lit? 23 22

22 Defective switch, LED, or standby/operate circuit (on the A10

Logic PCB).

23 Set the POWER switch to OFF, then ON.

24 Is the OVERCURRENT or OVERCOMPLIANCE LED lit? 34 25

25 Connect a 0.1 Ω resistor between the selected output terminals,

then connect a DVM across the 0.1 Ω resistor.

26 Connect a jumper wire between TP4 (Turn on 1) on the A8

Analog Control PCB and TP7 (-15 V) on the A4 Regulator PCB.

27 With the 5220A in standby, adjust R6 on the A6 Driver for a DVM

reading of 0 V ±1.0 mV.

28 Can a 0 V DVM reading be obtained? 30 29

29 The A6 Driver and/or A7 Output Assemblies are defective.

Repair as required.

30 The A6 Driver and A7 Output Assemblies are functional.

Remove the jumper from between TP4 and the A8 Analog

Control PCB and TP17 on the A4 Regulator.

31 Press the STBY/OPR switch. 32

32 Can the operate mode be selected? 33 34

Maintenance

Troubleshooting

4-23

Table 4-6. Mainframe and Digital Section Troubleshooting Guide (cont.)

Step Instruction Yes No Go to

33 The mainframe and digital section are operational; the

transconductance amplifier (A5, A6, A7) is defective. Check out

and repair the transconductance amplifier using Table 4-7,

Analog Section Troubleshooting Guide.

34 Is OVERCURRENT LED lit? 35 36

35 Check the following and repair as required:

1. Open feedback loop, current shunt to A5 Preamplifier.

2. Overcurrent detector on A8 PCB.

3. Failure status logic on A10 PCB.

4. Defective A5 Preamplifier PCB.

36 Is OVERCOMPLIANCE LED lit? 37 38

37 Check the following and repair as required:

1. Overvoltage detector on A8 PCB.

2. Open loop on transconductance amplifier (A5, A6, A7

PCBs).

3. Failure status circuit on the A10 PCB.

4. Open load or open circuit between output amplifier and

output terminals.

38 Check timing logic on the A10 Logic PCB, and the level shifters

on the A8 Analog Control PCB. Repair as required.

5220A

Instruction Manual

4-24

ajs19f.wmf

Figure 4-5. Flowchart Summary of Analog Section Troubleshooting Guide

Maintenance

Troubleshooting

4-25

Table 4-7. Analog Section Troubleshooting Guide

Step Instruction Yes No Go to

1 Complete the troubleshooting procedure given in Table 4-6. 2

2 Set the 5220A POWER switch to OFF. 3

3 Connect a jumper wire between the front panel VOLTAGE

INPUT terminals.

4 Connect a 0.1 Ω resistor between the selected output terminals,

then connect a DVM across the 0.1 Ω resistor.

5 Set the POWER switch to ON and select the operate mode. 6

6 Does the 5220A remain in the operate mode? 8 9

7 If the 5220A trips to standby and indicates an overcompliance or

overcurrent condition, the A5 Preamplifier PCB is at fault. Check

voltage levels on the active components on the A5 preamplifier

PCB while the unit is in standby. Repair as required.

8 Using a tuning tool, adjust R1, Zero Adjust, on the A5

Preamplifier PCB for a DVM reading of 0 V ±3 µV dc. The

adjustment should cover a range or 0 V ±5 µV.

9 Can R6 be adjusted for a DVM reading or 0 V ±3 µV? 17 10

10 Connect the DVM from TP4 (high) to TP5 (low) on the A5

Preamplifier PCB Assembly. With the 5220A in the operate

mode the DVM should read –15 V dc.

11 Does the DVM read –15 V dc? 13 14

12 Troubleshoot the Turn on 1 circuit starting with the level-shifting

transistors Q3 and Q4 on the A8 Analog Control PCB Assembly.

Then check for a T1 output from U22 on the A10 Logic PCB

Assembly. Repair as required.

13 Connect the DVM from TP6 (high) to TP5 (low) on the A5

Preamplifier PCB Assembly. With the 5220A in the operate

mode, the DVM should read –15 V dc.

14 Does the DVM read –15 V dc? 16 15

15 Troubleshoot the FET Drive 1 circuit starting with the level-

shifting transistors Q1 and Q2 on the A8 Analog Control PCB

Assembly. Then check for a T2 output from U22 on the A10

Logic PCB Assembly. Repair as required.

16 The A5 Preamplifier PCB Assembly is defective. Check voltage

levels on the active components on the A5 Preamplifier while the

unit is in standby. Repair as required.

17 The A5 Preamplifier, A6 Driver, and A7 Output stages are

operating properly. Set the 5220A to standby, remove and

replace the front panel short at the VOLTAGE INPUT terminals

with a 1.0 V dc voltage source; positive to red, negative to black.

18 Reconnect the DVM across the 0.1 Ω resistor to the output

terminals.

5220A

Instruction Manual

4-26

Table 4-7. Analog Section Troubleshooting Guide (cont.)

Step Instruction Yes No Go to

19 Set the 5220A to the operate mode and read the DVM. 20

20 Does the DVM read approximately +0.1 V dc? 26 22

21 Does the DVM read approximately 0 V? 22 23

22 Check relay K1 and associated drive circuits on the A5

Preamplifier PCB Assembly. Also check resistors R1, R2, and

R13 for open circuits. If these are OK, check the Relay 1 drive

signal from the A10 Logic PCB Assembly.

23 Is the DVM reading greater than 0.010 V dc? 24 25

24 The A6 Driver or A7 Output stage is defective. Check voltage

levels on active components to isolate the fault. Repair as

required.

25 The A5 preamplifier is defective. Check voltage levels on active

components to isolate the fault. Repair as required.

26 The 5220A is operational. Verify instrument compliance with

published specifications by completing the Performance Test

given earlier in this section of the manual.

5-1

Section 5

List of Replaceable Parts

5-1. Introduction

This section contains an illustrated list of replaceable parts for 5220A. Parts are listed by

assembly; alphabetized by reference designator. Each assembly is accompanied by an

illustration showing the location of each part and its reference designator. The parts lists

give the following information:

• Reference designator

• An indication if the part is subject to damage by static discharge

• Description

• Fluke stock number

• Total quantity

• Any special notes (i.e., factory-selected part)

Caution

A h symbol indicates a device that may be damaged by static

discharge.

5-2. How to Obtain Parts

Electrical components may be ordered directly from the manufacturer by using the

manufacturers part number, or from the Fluke Corporation and its authorized

representatives by using the part number under the heading FLUKE STOCK NO. In the

U.S., order directly from the Fluke Parts Dept. by calling 1-800-526-4731. Parts price

information is available from the Fluke Corporation or its representatives. Prices are also

available in a Fluke Replacement Parts Catalog which is available on request.

In the event that the part ordered has been replaced by a new or improved part, the

replacement will be accompanied by an explanatory note and installation instructions, if

necessary.

To ensure prompt delivery of the correct part, include the following information when

you place an order:

• Part number and revision level of the PCA containing the part.

• Reference designator

5220A

Instruction Manual

5-2

• Fluke stock number

• Description (as given under the Description heading)

• Quantity

• Instrument Model, Serial Number, and Firmware Numbers

5-3. Manual Status Information

The Manual Status Information table that precedes the parts list defines the assembly

revision levels that are documented in the manual. Revision levels are printed on the

component side of each PCA.

5-4. Newer Instruments

Changes and improvements made to the instrument are identified by incrementing the

revision letter marked on the affected PCA. These changes are documented on a manual

supplement which, when applicable, is included with the manual.

5-5. Service Centers

To locate an authorized service center, call Fluke using any of the phone numbers listed

below, or visit us on the World Wide Web: www.fluke.com

• 1-800-443-5853 in U.S.A and Canada

• 31 40 267 8200 in Europe

• 1-425-356-5500 from other countries

Note

This instrument may contain a Nickel-Cadmium battery. Do not mix with

the solid waste stream. Spent batteries should be disposed of by a qualified

recycler or hazardous materials handler. Contact your authorized Fluke

service center for recycling information.

W Warning

This instrument contains two fusible resistors (PN 650085). To

ensure safety, use exact replacement only.

Manual Status Information

Ref. or Option No. Assembly Name Fluke Part No. Revision Level

A1 Motherboard PCB Assembly 491209 D

A3 Capacitor Bus PCB Assembly 497446 

A4 Regulator PCB Assembly 489690 E

A5 Preamplifier PCB Assembly 487702 T

A6 Driver PCB Assembly 540146 E

A7 Output PCB Assembly 540138 F

A8 Analog Control PCB Assembly 491241 G

A9 Front Panel PCB Assembly 491217 B

A10 Logic PCB Assembly 491258 G

List of Replaceable Parts

Service Centers

5-3

A11 MIS Bus Interface PCB

Assembly

491266 C

A13 Output Termination PCB

Assembly

491274 B

5220A

Instruction Manual

5-4

Table 5-1. 5220A Final Assembly

Reference

Designator Description

Fluke Part

No.

Total

Quantity

A1 h Motherboard PCB Assembly 491209 1

A2 Power Transformer Assembly 491282 1

A3 h Capacitor Bus PCB Assembly 476994 1

A4 h Regulator PCB Assembly 489690 1

A5 h Preamplifier PCB Assembly 947205 1

A6 h Driver PCB Assembly 540146 1

A7 h Output PCB Assembly 540138 1

A8 h Analog Control PCB Assembly 491241 1

A9 h Front Panel PCB Assembly 491217 1

A10 h Logic PCB Assembly 491258 1

A11 h MIS Bus Interface PCB Assembly 491266 1

A12 Shunt Assembly 491290 1

A13 h Output Termination PCB Assembly 491274 2

A14 h Extender PCB Assembly 486217 1

B1 Venturi Muffin Fan, 4.5 in 103374 1

C1-C8 Capacitor, AL, 50,000 µF, +100-10 %, 15 V, Hi Term. 423525 8

C9 Capacitor, CER, 0.05 µF, +80-20 %, 1,000 V, Z5U 355420 1

CR1, CR3 Diode, SI, 50 PIV, 20.0 A 483206 2

CR2, CR4 Diode, SI, 50 PIV, 20.0 A 483214 2

E1, E2 Terminal Ring, 0.087 & 0.195, Solder 101048 2

F1 W Fuse, 0.25 x 1.25, 3 A ,250 V, Slow 109280 1

F2, F3 W Fuse 0.25 x 1.25, 30 A, 32 V, Fast 500793 2

H1 Screw, Cap, Sckt, Steel, 8-32 x 0.375 295105 8

H2 Screw, Machine, FH, P, Steel, 8-32 x 0.312 281725 14

H3 Screw, Machine, FHU, P, SS, 6-32 x 0.250 320093 16

H4 Screw, Machine, PH, P, Steel, 6-32 x 0.250 152140 80

H5 Screw, Machine, FH, P, Steel, 8-32 x 0.375 114116 8

H6 Nut, Machine, Hex, Nylon, 8-32 110593 8

H7 Screw, Machine, PH, P, Steel, 6-32 x 0.375 152165 10

H8 Screw, Machine, RHSL, Nylon, 8-32 x 1/2 501569 4

H9 Washer, Lock, Internal, Steel, 0.267 ID 110817 4

H10 Nut, Machine, Hex, BR, 10-32 529032 2

List of Replaceable Parts

Service Centers

5-5

Table 5-1. 5220A Final Assembly (cont.)

Reference

Designator Description

Fluke Part

No.

Total

Quantity

H11 Washer, Lock, Internal, Steel, #4 110403 2

H12 Nut, Machine, Hex, Steel, 4-40 110635 2

H13 Screw, Machine, PH, P, Steel, 6-32 x 0.500 152173 13

H14 Nut, Machine, Hex, BR, 1/4-28 110619 9

H15 Washer, Shoulder, Fiber, 0.250 ID 110833 4

H16 Screw, Machine, PH, P, Steel, 8-32 x 0.500 159749 5

H17 Nut, Machine, Hex, Steel, 8-32 110544 10

H18 Screw, Machine, PH, P, Steel, 10-32 x 0.375 114314 16

H19 Washer, Flat, Steel, 0.265, 0.500, 0.031 110718 4

H20 Washer, Flat, Teflon, 0.366 x 0.266 x 0.050 543314 4

H21 Screw, Machine, PH, P, Steel, 6-32 x 0.625 152181 8

H22 Screw, Machine, PH, P, Steel, 6-32 x 1.500 114181 4

H23 Screw, Machine, PH, P, Steel, 8-32 x 0.375 114124 14

H24 Screw, Machine, PH, P, Steel, 10-32 x 0.625 114066 4

H25 Washer, Lock, External, Steel, 0.500 175943 1

MP1 Panel, Front 479618 1

MP2 Corner Handle, Front, 7 in 394320 2

MP3 Cover, Top 522524 1

MP4 Bracket, Front Panel 486068 2

MP5 Cover, Power Supply 489500 1

MP6 M07-800-415 Decal Covers, Plastic 394403 4

MP7 Plastic Part, Hole Plug, Polyethylene, 0.312 187799 7

MP8 Cover Plate, Digital Connector 502781 1

MP9 Side Trim-21 in 526004 2

MP10 Panel, Rear 485888 1

MP11 Shim, Rear Corner 486050 2

MP12 Corner, Rear 486076 2

MP13 Decal, Rear 502799 1

MP14 Plate, Rear Output 485995 1

MP15 Plate, Front Output 485987 1

MP16 Output Bus, Minus 489526 1

MP17 Output Bus, Plus- Forward 486534 1

5220A

Instruction Manual

5-6

Table 5-1. 5220A Final Assembly (cont.)

Reference

Designator Description

Fluke Part

No.

Total

Quantity

MP18 Output Bus, Plus- Aft 486542 1

MP19 Output Bus, Spacer 486559 1

MP20 Assembly, Red 10-32 Binding Post Bracket 794404 2

MP21 Assembly, Black 10-32 Binding Post Bracket 794412 2

MP22 Shunt Bus, Minus 490524 1

MP23 Shunt Bus, Plus 497974 1

MP241Banana Jack, Panel 101550 4

MP25 Spacer, Round, Nylon, 6-32 x 1.063 104174 4

MP26 Bracket, Fan & Power Supply 485953 1

MP27 Cable Tie, 4.0 Length, 0.100 Width, 0.75 Diameter 172080 2

MP28 Binding Post Part, Head, Brass, 1/4-28 102889 1

MP29 Bushing, Snap-in, Nylon, 0.250 ID 102996 1

MP30 Terminal, Insulated, Standoff, Bifurcated 271650 2

MP31 Power Plug, Panel, 6 A, 250 V, 3-wire 284166 1

MP32 Card Guide, Nylon, 4.50 x 0.076 2-snap 256461 12

MP33 Binding Post, Brass, 1/4-28 102707 1

MP34 Holder Part, Fuse, Cap, 1/4 x 1-1/4 460238 1

MP35 Heatsink, Diode 502179 1

MP36 Insulating Part, Diode, Silicone, Washer 500785 4

MP37 Bus, Capacitor 497982 1

MP38 Chassis Side, Left 485896 1

MP39 Chassis Side, Right 485904 1

MP40 Chassis, Bottom 485912 1

MP41 Bulkhead, Front 485920 1

MP42 Bulkhead, Rear 485938 1

MP43 Partition, Rear 485946 1

MP44 Capacitor Tray 486035 1

MP45 Plate, Front Input 485979 1

MP46 Assembly, Red 6-32 Binding Post Bracket 794453 1

MP47 Assembly, Black 6-32 Binding Post Bracket 794461 1

MP48 Fan Accessory, Filter, AL with Foam 542118 1

MP49 Cover, Bottom 522532 1

List of Replaceable Parts

Service Centers

5-7

Table 5-1. 5220A Final Assembly (cont.)

Reference

Designator Description

Fluke Part

No.

Total

Quantity

MP50 Foot, Bail Stand 292870 4

MP51 Spacer, Capacitor 489484 2

MP52 Filter, Retainer 576967 1

MP54 Nameplate, 0.350 x 1.3, Serial Number 472795 1

MP55 Cover, Shunt 489948 1

R2, R5 Resistor, CC, 100, ±10 %, 2 W 109934 2

TM1 5220A Instruction Manual 491936 1

VR1, VR22Zener, Transient Suppressor, 7.5 V, 10 % 904896 2

W1 Line Cord, 5-15/IEC, 3-18 AWG, SVT, 7.5 ft 284174 1

W2 Cable, Fan/Power 491308 1

W3 Fan-Cable 629188 1

XF1 Holder Part, Fuse, Body, 1/4 x 1-1/4, 5 x 20 mm 460329 1

XF2, XF3 Fuse, Clip, PCB, 1/4 x 1-1/4 756460 4

Not Shown Recommended Spare Parts Kit 756460 -

h Indicates a static-sensitive part.

1. This item consists of a plug, a washer, and a hex nut.

2. These parts are located on the A1 Motherboard pcb assembly schematic.

5220A

Instruction Manual

5-8

ajs20f.wmf

Figure 5-1. 5220A Final Assembly

List of Replaceable Parts

Service Centers

5-9

ajs21f.wmf

Figure 5-1. 5220A Final Assembly (cont.)

5220A

Instruction Manual

5-10

ajs22f.wmf

Figure 5-1. 5220A Final Assembly (cont.)

List of Replaceable Parts

Service Centers

5-11

ajs23f.wmf

Figure 5-1. 5220A Final Assembly (cont.)

5220A

Instruction Manual

5-12

ajs24f.wmf

Figure 5-1. 5220A Final Assembly (cont.)

List of Replaceable Parts

Service Centers

5-13

ajs25f.wmf

Figure 5-1. 5220A Final Assembly (cont.)

5220A

Instruction Manual

5-14

ajs26f.wmf

Figure 5-1. 5220A Final Assembly (cont.)

List of Replaceable Parts

Service Centers

5-15

ajs27f.wmf

Figure 5-1. 5220A Final Assembly (cont.)

5220A

Instruction Manual

5-16

ajs28f.wmf

Figure 5-1. 5220A Final Assembly (cont.)

List of Replaceable Parts

Service Centers

5-17

Table 5-2. A1 Motherboard PCB Assembly

Reference

Designator Description

Fluke

Part No.

Total

Quantity

J10, J20, J30,

J40, J50, J70, J90

Connector, PCB Edge, Rec., 0.150 CTR, 40 Position 422550 7

J1 Header, 1 Row, 0.156 CTR, 10 Pin 446724 1

J10, J85 Connector, PCB Edge, Rec., 0.150 CTR, 24 Position 295352 2

J80 Connector, PCB Edge, Rec., 0.150 CTR, 22 Position 459883 1

MP1 Cover, AC Switch 475681 1

MP2 Pushbutton, SML Rect. C L Repl., Green 419747 1

MP3 Pin, Single, PCB, 0.025 Sq. 267500 3

MP4 Connector, Accessory, PCB Edge, Polarizing Insert 424572 19

MP5 Bushing, Snap-In, Nylon, 0.250 ID 102996 2

MP6 Spacer, Swaged, Round, Brass, 6-32 x 0.500 284380 4

S4 Switch, On-Off 453605 1

ajs35f.wmf

Figure 5-2. A1 Motherboard PCB Assembly

5220A

Instruction Manual

5-18

Table 5-3. A2 Power Transformer Assembly

Reference

Designator Description

Fluke

Part No.

Total

Quantity

F4 – F7 Fuse, 0.25 x 1.25, 0.5 A, 250 V, Slow 109322 4

H1 Screw, Machine, PH, P, Steel, 8-32 x 0.250 228890 8

H2 Screw, Machine, PH, P, Steel, 6-32 x 0.250 152140 8

MP1 Transformer Plate, Inboard 489468 1

MP2 Transformer Plate, Outboard 489476 1

MP3 Forward Transformer Terminator Assembly 660217 1

MP4 Aft Transformer Terminator Assembly 660225 1

MP5 Grommet, Slot, Rubber, 0.750, 0.875 380782 1

S1–S3 Switch, Slide, DPDT, Power 234278 3

T1 Power Transformer 477000 1

XF4–XF7 Fuse, Clip, PCB, 1/4 x 1-1/4 756460 8

ajs37f.wmf

Figure 5-3. A2 Power Transformer Assembly

List of Replaceable Parts

Service Centers

5-19

Table 5-4. A3 Capacitor Bus PCB Assembly

Reference

Designator Description

Fluke

Part No.

Total

Quantity

C1 – C8 Capacitor, AL, 50,000 µF, +100-10 %, 15 V, Hi Term 432525 8

CR1, CR3 Diode, SI, 50 PIV, 20.0 A 483206 2

CR2, CR4 Diode, SI, 50 PIV, 20.0 A 483214 2

F2, F3 Fuse, 0.25 x 1.25, 30 A, 32 V, Fast 500793 2

H14 Nut, Machine, Hex, BR, ¼-28 110619 9

H15 Washer, Shoulder, Fiber, 0.250 ID 110833 4

H16 Screw, Machine, PH, P, Steel, 10-32 x 0.375 159749 5

H17 Nut, Machine, Hex, Steel, 8-32 110544 10

H18 Screw, Machine, PH, P, Steel, 10-32 x 0.375 114314 16

H19 Washer, Flat, Steel, 0.265, 0.500, 0.031 110718 4

H20 Washer, Flat, Teflon, 0.366 x 0.266 x 0.050 543314 4

MP35 Heatsink, Diode 502179 1

MP36 Insulation Part, Diode, Silicone, Washer 500785 4

MP37 Bus, Capacitor 497982 1

R2, R5 Resistor, CC, 100, ±10 %, 2 W 109934 2

XF2, XF5 Fuse, Clip, PCB, 1/4 x 1-1/4 756460 4

5220A

Instruction Manual

5-20

ajs38f.wmf

Figure 5-4. A3 Capacitor Bus PCB Assembly

List of Replaceable Parts

Service Centers

5-21

Table 5-5. A4 Regulator PCB Assembly

Reference

Designator Description

Fluke

Part No.

Total

Quantity

C9, C10, C16, C17 Capacitor, AL, 4700 µF, +75-20 %, 16 V 379370 4

C11, C14, C15, C18 Capacitor, TA, 22 µF, ±20 %, 25 V 357780 4

C12, C13 Capacitor, AL, 2200 µF, +75-20 %, 25 V 392720 2

CR5 – CR7 Diode, SI, Rectifier, Bridge, BV = 100 V, IO = 1.0 A 392910 3

CR8, CR9 h Diode, SI, BV = 75 V, IO = 150 mA, 500 mW 203323 2

H1 Screw, Machine, PH, P, SEMS, Steel, 4-40, 0.250 185918 4

H2 Nut, Machine, Hex, Steel, 4-40 110635 4

MP1 Heat Dissipator, PCB MTG, 1.380, 2.000, 0.500 386235 4

MP2 Cable Tie, 4.0 L, 0.100 W, 0.75 Dia. 172080 6

R4, R6, R9, R15 Resistor, CF, 100 k, ±5 %, 0.25 W 348920 4

R7, R12 Resistor, CC, 220 Ω, ±10 %, 1 W 109462 2

R8 Resistor, CF, 1 k, ±5 %, 0.25 W 343426 1

R10, R11 Resistor, CC, 1 k, ±10 %, 1 W 109371 2

R13 Resistor, CF, 18 k, ±5 %, 0.25 W 348862 1

TP1 – TP8 Terminal, Uninsulated, Feedthrough, Hole, Turret 179283 8

U1, U4 h IC, Voltage Regulator, Fixed, +5 V, 1.5 A 355107 2

U2 h IC, Voltage Regulator, Fixed, +15 V, 1.5 A 413187 1

U3 h IC, Voltage Regulator, Fixed, -15 V, 1.5 A 413179 1

VR1 h Zener, Uncompensated, 4.3 V, 5 %, 20.0 mA, 0.4 W 180455 1

h Indicates a static-sensitive part.

5220A

Instruction Manual

5-22

ajs39f.wmf

Figure 5-5. A4 Regulator PCB Assembly

List of Replaceable Parts

Service Centers

5-23

Table 5-6. A5 Preamplifier PCB Assembly

Reference

Designator Description

Fluke

Part No.

Total

Quantity

C1, C2 Capacitor, CER, 100 pF, ±2 %, 100 V, COG 512848 2

C3, C5, C6 Capacitor, CER, 0.22 µF, ±20 %, 50 V, Z5U 309849 7

C4 Capacitor, Variable,1 – 42 pF, 750 V, Glass 758029 1

C7 Capacitor, CER, 1800 pF, ±5 % 50 V, COG 528547 1

C12, C15 Capacitor, TA, 10 µF, ±20 %, 20 V 330662 2

CR1, CR2, CR6 h Diode, SI, BV = 75 V, IO = 150 mA, 500 mW 203323 3

CR3 – CR5 h Diode, SI, BV = 20.0 V, IO = 50 mA, 250 mW 375907 3

E1, E2, E3 Jumper, Wire, Non-insulated, 0.200 CTR 816090 3

H1 Screw, Machine, SEMS, PH, P, Steel, 6-32, 0.250 178533 4

K1, K2 Relay, Reed, 1 Form A, 4.5 V dc 424408 2

MP1 Spacer, Swaged, Round, Brass, 6-32 x 0.812 306804 4

MP2 Shield, Preamplifier 486001 1

MP3 Spacer, Switch Standoff, Polyethylene, 0.094 285353 2

Q1 h Transistor, SI, N-JFET, Hi-Voltage, TO-92 393314 1

Q2 h Transistor, SI, NPN, Dual, TO-5 478099 1

Q3 h Transistor, SI, NPN, Small Signal 329698 1

R1, R2 Resistor Set, 1 k; 98.5 k 502625 1

R3 Resistor, Variable, CER, 500 Ω, ±20 %, 0.5 W 267849 1

R4 Resistor, MF, 60.4 k, ±1 %, 0.125 W, 100 PPM 291419 1

R5, R7 Resistors, 301 k Set 502671 1

R6 Resistor, Variable, CER, 2 k, ±20 %, 0.5 W 267864 1

R8 Resistor, MF, 215 k, ±1 %, 0.125 W, 100 PPM 289470 1

R9 Resistor, MF, 1 k, ±, 0.125 W, 100 PPM 168229 1

R10, R20 Resistor, CF, 100 k, ±5 %, 0.25 W 348920 2

R11, R121Resistor, MF, 100.03 k, ±0.1 %, 0.125 W, 25 PPM 291088 1

R132Resistor, Factory Selected - 2

R14 Resistor, MF, 100k, ±1 %, 0.125 W, 100 PPM 248807 1

R15, R25 Resistor, MF, 392 Ω, ±1 %, 0.125 W, 100 PPM 260299 2

R16 Resistor, MF, 10 k, ±1 %, 0.125 W, 100 PPM 168260 1

R17, R18 Resistor, CF, 10 Ω, ±5 %, 0.25 W 340075 2

5220A

Instruction Manual

5-24

Table 5-6. A5 Preamplifier PCB Assembly (cont.)

Reference

Designator Description

Fluke

Part No.

Total

Quantity

R19 Resistor, MF, 422 Ω, ±1 %, 0.125 W, 100 PPM 288506 1

R21, R23 Resistor, CF, 1 k, ±5 %,, 0.25 W 343426 2

R22 Resistor, CF, 1.2 k, ±5 %, 0.25 W 441378 1

R24 Resistor, CF, 33k, ±5 %, 0.25 W 348888 1

TP1 – TP14 Terminal, Un-insulated, Feed-through, Hole, Turret 179283 14

U1 h IC, Array, 5 Transistors, NPN, 3 Isolated, 2

Differentially Connected

248906 1

U2 h IC, OP AMP, JFET Input, TO-5 429837 1

U3 h Isolator, Opto, LED to Photo Resistor 507475 1

U4 h IC, CMOS, Hex Inverter 404681 1

h Indicates a static-sensitive part.

1. R11 and R12 are factory selected. See Table 4-4.

2. R13 may or may not be installed as factory selected. See Table 4-5.

List of Replaceable Parts

Service Centers

5-25

ajs40f.wmf

Figure 5-6. A5 Preamplifier PCB Assembly

5220A

Instruction Manual

5-26

Table 5-7. A6 Driver PCB Assembly

Reference

Designator Description

Fluke

Part No.

Total

Quantity

C1 Capacitor, Polyester, 0.027 µF, ±10 %, 250 V 267120 1

C2 Capacitor, TA, 6.8 µF, ±20 %, 35 V 363713 1

C3, C4 Capacitor, CER, 180 pF, ±10 % 1000 V, S3N 105890 2

C5 Capacitor, CER, 5000 pF, ±20 %, 100 V, Z5V 175232 1

C6 Capacitor, TA, 220 µF, ±20 %, 6 V 408682 1

C7 Capatitor, CER, 0.1 µF, ±20 %, 100 V Z5V 149146 1

CR1 h Diode, SI, N-JFET, Current Regulator, IF = 5.3 mA 334714 1

CR2 h Diode, SI, BV = 75 V, IO = 150 mA, 500 mW 203323 1

H1 Screw, Machine, PH, P, Steel, 6-32 x 1.000 114215 1

H2 Nut, Hex, Steel, 6-32 110551 1

MP1 Spacer, Round, Aluminum, 0.156 ID x 0.750 100966 1

Q1 h Transistor, SI, PNP, Small Signal 229898 1

Q2 – Q4 h Transistor, SI, NPN, Small Signal 218081 3

Q5, Q9, Q10 h Transistor, SI, PNP, Small Signal 402586 3

Q6, Q7, Q11 h Transistor, SI, N-JFET, TO-92, Switch 261578 3

Q8, Q12 h Transistor, SI, NPN, Small Signal 346916 2

R1 – R3 Resistor, CF, 1 k, ±5 %, 0.25 W 343426 3

R4, R5 Resistor, MF, 523 Ω, ±1 %, 0.125 W, 100 PPM 294835 2

R6 Resistor, Variable, CERM, 10 Ω, ±20 %, 0.5 W 344135 1

R7, R23 Resistor, CF, 100 k, ±5 %, 0.25 W 348920 2

R8 Resistor, MF, 191 Ω, ±1 %, 0.125 W, 100 PPM 325639 1

R9, R12 Resistor, CF, 560 Ω, ±5 %, 0.25 W 385948 2

R10 Resistor, 240 Ω, ±5 %, 0.25 W 376624 1

R13 Resistor, Variable, CERM, 100 Ω, ±20 % , 0.5 W 267823 1

R14, R16 Resistor, MF, 604 Ω, ±1 %, 0.125 W, 100 PPM 320309 2

R15 Resistor, MF, 383 Ω, ±1 %, 0.125 W, 100 PPM 375899 1

R17 Resistor, MF, 953 Ω, ±1 %, 0.125 W, 100 PPM 288555 1

R18, R24 Resistor, MF, 100 Ω, ±1 %, 0.125 W, 100 PPM 168195 2

R19, R25 Resistor, CF, 51 Ω, ±5 %, 0.25 W 414540 2

R20 Resistor CF, 100 Ω, ±5 %, 0.25 W 348771 1

R21, R22 Resistor, MF, 33.2 Ω, ±1 %, 0.125 W, 100 PPM 296681 2

R26, R27 Resistor, MF, 20 Ω, ±1 %, 0.125 W, 100 PPM 236844 2

List of Replaceable Parts

Service Centers

5-27

Table 5-7. A6 Driver PCB Assembly (cont.)

Reference

Designator Description

Fluke

Part No.

Total

Quantity

R28, R29 Resistor, CF, 6.8 k, ±5 %, 0.25 W 368761 2

R30, R31 Resistor, CC, 10 Ω, ±10 %, 0.5 W 108092 2

TP1 – TP4 Terminal, Un-insulated, Feed-through, Hole, Turret 179283 4

VR1, VR2 h Zener, Uncompensated, 4.3 V, 5 %, 20.0 mA, 0.4 W 180455 2

h Indicates a static-sensitive part.

ajs41f.wmf

Figure 5-7. A6 Driver PCB Assembly

5220A

Instruction Manual

5-28

Table 5-8. A7 Output PCB Assembly

Reference

Designator Description Fluke

Part No. Total

Quantity

H1 Screw, Machine, PH, P, Steel, 4-40 x 0.375 152124 2

H2 Washer, Lock, Internal, Steel, #4 110403 2

H3 Nut, Hex, S. Steel, 4-40 147611 2

H4 Screw, Machine, PH, P, Steel, 6-32 x 0.250 152140 2

H5 Screw, Machine, PH, P, Steel, 6-32 x 0.750 114223 8

H6 Washer, Lock, Internal, Steel #6 110338 1

H7 Nut, Hex, Steel, 6-32 110551 1

H8 Screw, Machine, PH, P, Steel, 8-32 x 0.35 114124 8

H9 Nut, Macine, Hex, Steel, 8-32 110544 2

H10 Screw, Machine, PH, P, Steel, 4-40 x 0.312 152116 1

MP1 Output, PCB Bracket 489567 1

MP2 Fin, Heatsink 489880 1

MP3 Plate, Temperature Sense 489898 1

MP4 Bus, Output PCB 502161 2

MP5 Output Chamber 485961 1

MP6 Defector Fin, Heatsink 489508 1

MP7 Spacer, Swaged, Hex, Brass, 6-32 x 0.625 181727 2

MP8 Spacer, Swaged, Round, Brass, 6-32 x 0.187 351882 8

MP9 Insulated Part, Transistor, Aluminum, TO-3 477802 4

MP10 Socket, Single, PCB, For 0.018 – 0.040 Pin 348201 8

MP11 Heat Dissipator, W/BEO Washer, TO-5 407262 1

MP12 Space, Transistor Mount, DAP 152207 1

MP13 Washer, Flat, Nylon, 0.257 ID x 0.500 x 0.093 682385 1

MP14 Plastic Part, Hole Plug, Polyethylene, 0.312 187799 2

MP15 Washer, Shoulder, Nylon, 0.113, 0.345 485417 3

MP16 Insulated Part, Transistor, Film, TO-220 412809 1

Q101 h Transistor, SI, BV = 45 V, 27 W, TO-220 325753 1

Q102 h Transistor, SI, BV = 45 V, 30 W, TO-220 325761 1

Q103, Q104 h Transistor, SI, BV = 60 V, 200 W, TO-3 483222 2

Q105, Q106 h Transistor, SI, PNP, Small Signal 483230 2

Q107 Resistor, CF, 1 k, ±5 %, 0.25 W 402586 1

R101 – R107 Resistor, CF, 1 k, ±5 %, 0.25 W 343426 7

R108, R109 Resistor, CC, 5.1 Ω, ±5 %, 0.5 W 177147 2

R110 – R113 Resistor, 0.086 Ω, ±1 %, 4-Terminal, 10 W, 50 PPM 490771 4

R114, R115 Resistor, WW, 2.4 Ω, ±5 %, 2 W 219337 2

S101 Thermo, NO230±8F, NC200±8F, 15 A/120 V ac 344002 1

TP1 – TP7 Terminal, Un-insulated, Feed-through, Hole, Turret 179283 7

XQ101, XQ102 Socket, Transistor, 3-Pin 402958 2

h Indicates a static-sensitive part.

List of Replaceable Parts

Service Centers

5-29

ajs42f.wmf

Figure 5-8. A7 Output PCB Assembly

5220A

Instruction Manual

5-30

ajs43f.wmf

Figure 5-8. A7 Output PCB Assembly (cont.)

List of Replaceable Parts

Service Centers

5-31

Table 5-9. A8 Analog Control PCB Assembly

Reference

Designator Description

Fluke

Part No.

Total

Quantity

C1 Capacitor, CER, 0.10 µF, ±20 %, 50 V, X7R 853650 1

C2 Capacitor, Polyester, 0.22 µF, ±10 %, 100 V 436113 1

C3 Capacitor, TA, 0.68 µF, ±10 %, 35 V 182790 1

CR1 – CR10 h Diode, SI, BV = 20.0 V, IO = 50 Machine, Selected IR 348117 10

CR11 h Diode, SI, BV = 75.0 V, IO = 150 Machine, 500 mW 203323 1

Q1, Q3 h Transistor, SI, PNP, Small Signal 195974 2

Q2, Q4 h Transistor, SI, NPN, Small Signal 218396 2

R1, R2 Resistor, MF, 100 k, ±1 %, 0.125 W, 100 PPM 248807 2

R3 Resistor, CF, 51 k, ±5 %, 0.25 W 376434 1

R4, R6, R7, R16 –

R19, R25, R28,

R29, R32

Resistor, CF, 10 k, ±5 %, 0.25 W 348839 11

R5, R10, R27, R31,

R35 – R42

Resistor, CF, 100 k, ±5 %, 0.25 W 348920 12

R8 Resistor, CF, 82 k, ±5 %, 0.25 W 348912 1

R9 Resistor, Variable, CER, 100 k, ±10 %, 0.5 W 288308 1

R11 Resistor, CF, 300 k, ±5 %, 0.25 W 441535 1

R12, R24, R43 Resistor, CF, 1 k, ±5 %, 0.25 W 343426 3

R13, R14 Resistor, MF, 10 k, ±1 %, 0.125 W, 100 PPM 168206 2

R15 Resistor, CF, 5.1 k, ±5 %, 0.25 W 368712 1

R20 Resistor, CF, 9.1 k, ±5 %, 0.25 W 441691 1

R21 Resistor, Variable, CER, 5 k, ±10 %, 0.5 W 288282 1

R22 Resistor, CF 1.1 k, ±5 %, 0.25 W 348797 1

R23 Resistor, CF, 390 k, ±5 %, 0.25 W 742475 1

R26, R30 Resistor, CF, 22 k, ±5 %, 0.25 W 348870 2

R33 Resistor, CF, 1.2 k, ±5 %, 0.25 W 441378 1

TP1 – TP5, TP7 –

TP13

Terminal, Un-insulated, Feed-through, Hole, Turret 179283 12

U1, U2 h IC, Op Amp, Quad, 14-Pin DIP 402669 2

U3 h IC, LSTTL, Hex Inverter w/Schmitt Trigger 483180 1

VR1, VR2 h Zener, Uncompensated, 6.8 V, 10 %, 1.0 Machine, 0.4 W 187195 2

h Indicates a static-sensitive part.

5220A

Instruction Manual

5-32

ajs44f.wmf

Figure 5-9. A8 Analog Control PCB Assembly

List of Replaceable Parts

Service Centers

5-33

Table 5-10. A9 Front Panel PCB Assembly

Reference

Designator Description

Fluke

Part No.

Total

Quantity

C1 Capacitor, CER, 0.22 µF, ±20 %, 50 V, Z5U 309849 1

DS1 – DS9 LED, Red, PCB mount, Luminous Intensity = 0.5 MCD 369777 9

MP1 Cover, Pushbutton, Switch 401299 3

MP2 Switch Part, SPST, Spring 414516 3

MP3 Switch Part, SPST, Fixed Contact 416875 3

MP4 Pushbutton-Square-, Dark Putty Grey 406728 3

R1 – R9 Resistor, CF, 220 Ω, ±5 %, 0.25 W 342626 9

S1 – S3 Actuator, Switch 412106 3

TP1 – TP2 Terminal, Un-insulated, Feed-through, Hole, Turret 179283 2

ajs29f.wmf

Figure 5-10. A9 Front Panel PCB Assembly

5220A

Instruction Manual

5-34

Table 5-11. A10 Logic PCB Assembly

Reference Designator Description Fluke

Part No. Total

Quantity

C1, C3, C4 Capacitor, Mica, 100 pF, ±5 %, 500 V 148494 3

C2 Capacitor, TA, 4.7 µF, ±20 %, 25 V 161943 1

C5 Capacitor, TA, 2.2 µF, ±20 %, 20 V 161927 1

C6 – C8 Capacitor, TA, 1 µF, ±10 %, 35 V 161919 3

C9 Capacitor, TA, 22 µF, ±20 %, 15 V 423012 1

C10 – C14 Capacitor, CER, 0.22 µF, ±20 %, 50 V, Z5U 309849 5

C15 Capacitor, CER, 0.01 µF, +80-20 %, 100 V, Z5V 149153 1

C16 Capacitor, TA, 0.47 µF, ±20 %, 35 V 161349 1

CR1 – CR3 h Diode, SI, BV = 75 V, IO = 150 mA, 500 mW 203323 3

R1, R2, R9, R10, R15, R16,

R19 Resistor, CF, 220 Ω, ±5 %, 0.25 W 342626 7

R3 – R6, R8, R11, R12, R14,

R17, R18, R20, R21 Resistor, CF, 10 k, ±5 %, 0.25 W 348839 12

R7, R22 Resistor, CF, 47 k, ±5 %, 0.25 W 348896 2

R13, R24, R26 Resistor, CF, 100 k, ±5 %, 0.25 W 348920 3

R22 Resistor, CF, 10 k, ±5 %, 0.25 W 348839 1

R23, R25 Resistor, CF, 4.7 k, ±5 %, 0.25 W 348821 2

TP1, TP2 Terminal, Un-insulated, Feed-through, Hole,

Turret 179283 2

U1, U4, U5, U20 Isolator, Opto, LED to Transistor, Dual 454330 4

U2 h IC, CMOS, Quad, 2-Input NAND w/Schmitt

Trigger

404632 1

U3 h IC, CMOS, Hex Inverter 404699 1

U6, U19 h IC CMOS, Quad 2-Input AND Gate 408401 2

U7, U10 h IC, CMOS, Dual D F/F, + Edge Trigger 418830 2

U8, U11 h IC, CMOS, Retrigger/Reset Multivibrator 393512 2

U9 h IC, CMOS, Triple 3-Input NOR Gate 355180 1

U12 – U14 h IC, LSTTL, Quad 2-Input NAND Gate 393116 3

U15 h IC, TTL, Dual NAND Driver w/Open Collector 329706 1

U16, U17 h IC, CMOS, Dual D F/F, + Edge Trigger 340117 2

U21 h IC, CMOS, Triple 3-Input OR Gate 408575 1

U22 h IC, LSTTL, 4-Bit Parallel I/O Right and Left

Shift Register

393249 1

U23 h IC, Bipolar, Timer, 8-Pin, DIP 402610 1

XU23 Socket, IC, 8-Pin 478016 1

h Indicates a static-sensitive part.

List of Replaceable Parts

Service Centers

5-35

ajs30f.wmf

Figure 5-11. A10 Logic PCB Assembly

5220A

Instruction Manual

5-36

Table 5-12. A11 MIS Bus Interface PCB Assembly

Reference

Designator Description

Fluke

Part No.

Total

Quantity

C1 Capacitor, TA, 4.7 µF, ±20 %, 25 V 161943 1

C2 Capacitor, TA, 22 µF, ±20 %, 15 V 423012 1

C3, C4 Capacitor, CER, 0.22 µF, ±20 %, 50 V, Z5U 309849 2

CR1 h Diode, SI, BV = 75.0 V, IO = 150 mA, 500 mW 203323 1

H1 Screw, Machine, PH, P, SEMS, Steel, 4-40, 0.250 185918 2

J71 Connector, Micro-Ribbon, REC, PCB, 24 Position 441337 1

MP1 Connector ACC, Micro-Ribbon, Latch 412700 2

MP2 Connector ACC, Micro-Ribbon, Spring 412718 2

MP3 Spacer, Swaged, Round, Brass, 4-40 x 0.187 335604 2

MP4 Spacer, Swaged, Round, Brass, 6-32 x 0.570 261875 1

R1 – R12 Resistor, CF, 10 k, ±5 %, 0.25 W 348839 12

R14 – R22 Resistor, CF, 1 k, ±5 %, 0.25 W 343426 9

R23 Resistor, CF, 47 k, ±5 %, 0.25 W 348896 1

TP1 – TP2 Terminal, Un-insulated, Feed-through, Hole, Turret 179283 2

U1 h IC, CMOS, Quad D F/F, + Edge Trigger, w/Clear 452912 1

U2 – U7 h IC, LSTTL, Quad 2-Input NAND Gate 394205 2

U3 h IC, CMOS, Hex Inverter 404699 1

U4 h IC, CMOS, Quad 2-Input NAND Gate 418509 1

U5 h IC, CMOS, Triple 3-Input NAND Gate 418244 1

U6 h IC, LSTTL, Quad 2-Input NAND Gate 393116 1

h Indicates a static-sensitive part.

List of Replaceable Parts

Service Centers

5-37

ajs31f.wmf

Figure 5-12. A11 MIS Bus PCB Assembly

5220A

Instruction Manual

5-38

Note

The A12 shunt assembly is a suggested non-repairable assembly.

Table 5-13. A12 Shunt Assembly

Reference

Designator Description

Fluke

Part No.

Total

Quantity

H1 Screw, Machine, SEMS, PH, P, Steel, 6-32 x 0.500 177030 4

H2 Screw, Machine, RH, SL, Steel, 6-32 x 2.750 115022 4

H3 Nut, Mini, Hex, SS, 6-32 110569 4

H4 Solder, Tin-Lead Alloy, Preform Ring 516989 32

J1 – J4 Banana Plug, Panel 101543 4

MP1 Top Support, Shunt 489906 1

MP2 Bottom Support, Shunt 489914 1

MP3 Terminal, Shunt 489922 2

MP4 Element, Shunt 524397 16

MP5 Spacer, Round, Aluminum, 0.156 ID x 0.156 157792 4

MP6 Spacer, Round, Aluminum, 0.156 ID x 1.500 104257 4

MP7 Spacer, Round, Aluminum, 0.156 ID x 1.000 102905 4

W1 Cable, Shunt 502674 1

List of Replaceable Parts

Service Centers

5-39

ajs32f.wmf

Figure 5-13. A12 Shunt Assembly

5220A

Instruction Manual

5-40

Table 5-14. A13 Output Termination PCB Assembly

Reference

Designator Description

Fluke

Part No.

Total

Quantity

C1 Capacitor, CER, 0.025 µF, 20 %, 100 V, Z5W 168435 1

C2 Capacitor, CER, 0.1 µF, +80-20 %, 25 V, Z5U 369199 1

R1 Resistor, MF, 40.2, ±1 %, 0.125 W, 100 PPM 245373 1

R2 Resistor, CF, 10 Ω, ±5 %, 0.25 W 340075 1

ajs33f.wmf

Figure 5-14. A13 Output Termination PCB

List of Replaceable Parts

Service Centers

5-41

Table 5-15. A14 Extender PCB Assembly

Reference

Designator Description

Fluke

Part No.

Total

Quantity

H1 Screw, Machine, SEMS, PH, P, Steel, 6-32, 0.250 178533 4

H2 Rivet, S-Tub, Oval, Steel, 0.118 x 0.218 103606 2

J1 Connector, PCB Edge, REC, 0.150 CTR, 40 Position 422550 1

J2 Connector, ACC, PCB Edge, Polarizing Insert 424572 1

MP1 Bracket, Right Angle, Tapped, Brass, 6-32 404525 4

ajs34f.wmf

Figure 5-15. A14 Extender PCB Assembly

5220A

Instruction Manual

5-42

6-1

Section 6

Option and Accessory Information

6-1. Introduction

This section of the manual documents the options and accessories available for use with

the 5220A. Currently, there are no options, and the accessories are limited to a choice of

two rack-mounting kits and a precision current shunt for calibration purposes. Each is

described in the following accessories subsection.

6-2. Accessories

6-3. Rack Mounting Kit (M08-205-600)

The 5220A can be rack mounted in a standard 19-inch equipment rack using Rack

Mounting Kit M08-205-600. Use the following procedure to install the kit:

1. Peel off the name plate decals from the front side corners of theinstrument.

2. Remove the front corner screws that match the hole pattern in the rack mounting ears

(see Figure 6-1).

3. Attach the rack mounting ears to the front corners of the unit using the screws

supplied in the rack mounting kit.

5220A

Instruction Manual

6-2

ajs45f.wmf

Figure 6-1. Rack Mounting Kit

Option and Accessory Information

Accessories

6-3

6-4. Rack Slide Kit (M00-280-610)

The 5220A can be rack mounted in a 24-inch deep equipment rack using the Rack Slide

Kit, model M00-280-610. Use the following procedure to install the kit:

1. Remove the horizontal side trim decal from both sides of the instrument.

2. Refer to Figure 6-2. Using the screws supplied with the kit, attach the chassis section

(B) of the slide kit to each side of the unit. Use the center row of mounting holes.

3. Install the cabinet section (D) of the center section (C) in the equipment rack.

4. Pull the center section of the slide out through the front of the equipment rack until it

locks in the extended position.

5. Depress the spring locks on the chassis section (B) and join sections B and C.

6. Push the instrument into the equipment rack and then pull it out to the extended

position. The spring locks should limit the rack slide travel.

6-5. Precision Y5020A Current Shunt

The Model Y5020A is a precision, high-current shunt recommended for use in calibrating

the Model 5220A Transconductance Amplifier. An instruction manual is suppled with the

unit.

5220A

Instruction Manual

6-4

ajs46f.wmf

Figure 6-2. Rack Slide Kit

7-1

Chapter 7

Schematic Diagrams

5220A

Instruction Manual

7-2

5220A-1001 (Sheet 1 of 2)

ajs47f.wmf

Figure 7-1. Interconnect Diagram

Schematic Diagrams

7-3

ajs48f.wm

Figure 7-1. Interconnect Diagram (cont.)

5220A

Instruction Manual

7-4

ajs49f.wmf

Figure 7-2. Chassis Wiring

Schematic Diagrams

7-5

ajs50f.wmf

Figure 7-2. Chassis Wiring (cont.)

5220A

Instruction Manual

7-6

ajs51f.wmf

Figure 7-3. Power Supply

Schematic Diagrams

7-7

ajs52f.wmf

Figure 7-3. Power Supply (cont.)

5220A

Instruction Manual

7-8

ajs53f.wmf

Figure 7-4. A5 Preamplifier PCB Assembly

Schematic Diagrams

7-9

ajs54f.wmf

Figure 7-4. A5 Preamplifier PCB Assembly (cont.)

5220A

Instruction Manual

7-10

ajs55f.wmf

Figure 7-5. A6 Driver and A7 Output PCB Assemblies

Schematic Diagrams

7-11

ajs56f.wmf

Figure 7-5. A6 Driver and A7 Output

PCB Assemblies (cont.)

5220A

Instruction Manual

7-12

ajs57f.wmf

Figure 7-6. A8 Analog Control PCB Assembly

Schematic Diagrams

7-13

ajs58f.wmf

Figure 7-6. A8 Analog Control PCB Assembly (cont.)

5220A

Instruction Manual

7-14

ajs59f.wmf

Figure 7-7. A9 Front Panel PCB Assembly

Schematic Diagrams

7-15

ajs60f.wmf

Figure 7-7. A9 Front Panel PCB Assembly (cont.)

5220A

Instruction Manual

7-16

ajs61f.wmf

Figure 7-8. A10 Logic PCB Assembly

Schematic Diagrams

7-17

ajs62f.wmf

Figure 7-8. A10 Logic PCB Assembly (cont.)

5220A

Instruction Manual

7-18

ajs63f.wmf

Figure 7-9. A11 MIS Bus Interface PCB Assembly

Schematic Diagrams

7-19

ajs64f.wmf

Figure 7-9. A11 MIS Bus Interface

PCB Assembly (cont.)

5220A

Instruction Manual

7-20

Fluke Car Amplifier 5220A Users Manual

5220A to the manual 1a0e97f0-0883-44b6-8e1f-568485694fd3

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