QUADTECH/QUADTECH Sentry 10, 20, 30 Plus Instruction QUADTECH

User Manual: QUADTECH/QUADTECH Sentry 10, 20, 30 Plus Instruction

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Sentry Plus Series
Hipot Testers
Instruction Manual
Form 150697/A4

QuadTech, Inc., 2003
5 Clock Tower Place, 210 East
Maynard, Massachusetts, U.S.A. 01754
January 2005
Telephone:
Sales:
Facsimile:
Website:

978-461-2100
800-253-1230
978-461-4295
www.quadtech.com

The material in this manual is for informational purposes only and is subject to change, without notice.
QuadTech assumes no responsibility for any error or for consequential damages that may result from the
misinterpretation of any procedures in this publication.

WARNING
Potentially dangerous voltages may be present on front and rear panel terminals. Follow all warnings in
this manual when operating or servicing this instrument. Dangerous levels of energy may be stored in
capacitive devices tested by this unit. Always make sure the high voltage indicator is not on when
connecting or disconnecting the device under test.

Product will be marked with this symbol (ISO#3864) when it is necessary for the user to refer to
the instruction manual in order to prevent injury or equipment damage.
Product marked with this symbol (IEC417) indicates presence of direct current.

Product will be marked with this symbol (ISO#3864) when voltages in excess of 1000V are
present.

Page 2 of 85

Contents
Warranty
............................................................................................................5
Specifications ............................................................................................................7
Accessories ............................................................................................................11
Safety Precautions....................................................................................................13
Condensed Operating Instructions ........................................................................15
Introduction - Section 1
1.1
Unpacking and Inspection..............................................................................21
1.2
Product Overview ..........................................................................................21
1.3
Controls and Indicators ..................................................................................22
1.3.1 Front Panel Controls and Indicators .................................................22
1.3.2 Rear Panel Controls and Connectors ................................................23
1.4
Installation .....................................................................................................24
1.4.1 Dimensions ........................................................................................24
1.4.2 Instrument Positioning .......................................................................24
1.4.3 Power Requirements ..........................................................................24
1.4.4 Safety Inspection................................................................................25
Operation - Section 2
2.1
Terms and Conventions .................................................................................27
2.2
Start-Up..........................................................................................................31
2.3
Programming Electrical Safety Tests.............................................................31
2.4
Programming a Ground Continuity Test .......................................................35
2.5
Programming an AC Hipot Test ....................................................................37
2.6
Programming a DC Hipot Test ......................................................................39
2.7
Programming an Insulation Resistance (IR) Test .........................................41
2.8
Programming a Pause (PA) in Test Sequence ..............................................43
2.9
Storing a Test Setup ......................................................................................45
2.10 Programming a Multi-Step Test.....................................................................47
2.11 PRESET Test Parameters .............................................................................48
2.11.1 AC-V FREQ ......................................................................................48
2.11.2 Software AGC ...................................................................................48
2.11.3 WV AUTO RANGE .........................................................................48
2.11.4 IR AUTO RANGE ............................................................................49
2.11.5 GFI ....................................................................................................49
2.11.6 FAIL RESTART ...............................................................................49
2.12 Instrument Offset ..........................................................................................50
2.13 Connection To Device Under Test ................................................................53
2.14 Measurement Procedure.................................................................................54

Page 3 of 85

Contents (Continued)
2.15

MENU Parameters ........................................................................................56
2.15.1 MEMORY Function .........................................................................57
2.15.2 SYSTEM Function ............................................................................59
2.15.2.1 CONTRAST ...................................................................59
2.15.2.2 BUZZER VOLUME .......................................................59
2.15.2.3 EN 50191 ........................................................................59
2.15.2.4 DC 50V AGC ..................................................................60
2.15.3 OPTION Function .............................................................................60
2.15.4 CALIBRATION Function ................................................................60
2.15.5 KEY LOCK Function .......................................................................61
2.15.6 CHANGE PASSWORD Function ....................................................63
2.15.7 ERROR LOG Function .....................................................................65
2.15.8 ABOUT Function ..............................................................................65

Interface - Section 3
3.1
Remote ..........................................................................................................67
3.2
G16 International Power Strip .......................................................................70
3.3
S07 Power Entry Adapter Cable ...................................................................71
3.4
S03 Corded Product Adapter ........................................................................72
3.5
S05 Foot Switch ............................................................................................73
3.6
S08 Gun Probe ..............................................................................................74
3.7
S50 Plus Ground Bond Tester .......................................................................75
Service & Calibration - Section 4
4.1
General...........................................................................................................77
4.2
Instrument Return ..........................................................................................77
4.3
Calibration......................................................................................................77
4.3.1 Calibration Parameters.......................................................................78
4.3.2 Enable Calibration ............................................................................79
4.3.3 AC Voltage Calibration .....................................................................80
4.3.4 DC Voltage Calibration .....................................................................80
4.3.5 IR Voltage Calibration.......................................................................81
4.3.6 AC Current Calibration......................................................................82
4.3.7 DC Current Calibration......................................................................83
4.3.8 ARC Calibration ................................................................................84
4.3.9 IR Resistor Calibration .....................................................................84
4.3.10 Ground Continuity Calibration .........................................................85
4.3.11 Contrast Calibration ..........................................................................85
4.3.12 Finalize Calibration ...........................................................................85

Page 4 of 85

Warranty

QuadTech warrants that Products are free from defects in material and workmanship and, when
properly used, will perform in accordance with QuadTech’s applicable published specifications.
If within one (1) year after original shipment it is found not to meet this standard, it will be
repaired, or at the option of QuadTech, replaced at no charge when returned to a QuadTech
service facility.
Changes in the Product not approved by QuadTech shall void this warranty.
QuadTech shall not be liable for any indirect, special or consequential damages, even if
notice has been given of the possibility of such damages.
This warranty is in lieu of all other warranties, expressed or implied, including, but not
limited to any implied warranty or merchantability of fitness for a particular purpose.

SERVICE POLICY
QuadTech’s service policy is to maintain product repair capability for a period of at least five (5)
years after original shipment and to make this capability available at the then prevailing schedule
of charges.

Page 5 of 85

Page 6 of 85

Specifications
Dielectric Strength
Sentry 10, 20, & 30 Plus
AC Output Voltage:

Voltage Display:
AC Current Display:
Sentry 20 & 30 Plus
DC Output Voltage:
Voltage Display:
DC Current Display:

Range:
Regulation:
Frequency:
Accuracy:
Resolution:
Range:
Accuracy:

0.05 to 5kV AC, in 1V steps
± (1% of setting +5V)
50/60Hz selectable
± (1% of reading +5V)
1Volt
0.001mA to 20mA AC, in 1µA steps
± (1.5% of reading + 5 counts) (Total)

Range:
Accuracy:
Resolution:
Range:
Resolution:
Accuracy:

0.05 to 6kV DC, in 1V steps
± (1% of reading +5V)
1Volt
0.0001mA to 5mA DC
0.1µA
± (1.5% of reading + 5 counts)

Voltage:
Accuracy:
Range:
Accuracy:

50 - 1000V DC in 1V steps
± (1% of reading + 5V)
0.1MΩ - 50GΩ (voltage dependent)
0.1MΩ - 1GΩ, ± (10% + 5counts) < 100V
0.1MΩ - 1GΩ, ± (7% + 5counts) < 500V
1MΩ - 1GΩ, ± (4% + 5counts) ≥ 500V
1GΩ - 10GΩ, ± (7% + 5counts) ≥ 500V
10GΩ - 50GΩ, ± (12% + 5counts) ≥ 500V

Insulation Resistance
Sentry 30 Plus
Insulation Resistance:

Page 7 of 85

Specifications (Continued)
Safety Features
Ground
Continuity Test:

Programmable: 0.1Ω to 5.0Ω ±0.2Ω Accuracy, or OFF

Ground Fault
Interrupt (GFI):

Shutdown of current imbalance when I > 0.5mA ±0.25mA, or OFF

In-Rush Current:

DC Mode: Set detection limit: 0.5uA – 5mA in 0.0001mA increments
The programmable range for In-Rush current is dependent on the
programmed High Limit:
Range:
High Limit:
In-Rush:
1
0.1µA – 300µA
0.5µA – 300µA
2
0.301mA – 3.000mA
5µA – 3.000mA
3
3.01mA – 5.0mA
50µA – 5.0mA

Fast Output Cutoff: HV output voltage terminated <0.4mS after NG (Fail) result
Fast Discharge:

<0.2s (Typical) Discharge of DUT upon termination of HV.

ARC Detection:

Detection Current:
Pulse Width:

Range: 1mA – 20mA AC and 5mA DC
Minimum: 10µs

General Features
Time:

Test*:
Ramp:
Dwell:
Fall:

0.1sec – 999 sec, Continuous
0.1sec – 999 sec, OFF
0.1sec – 999 sec, OFF (DC & IR Mode only)
0.1sec – 999 sec, OFF

* Test Time is limited ≤ 60seconds when the voltage and high current limit > 100VA.
* Test Time for IR is 0.3sec – 999sec, Continuous

Limits:

HI/LO programmable during Test Time
LO can be set to OFF during Hipot Test
HI can be set to OFF during IR Test

Indication:

Pass/fail LEDs, audible alarm

Remote Control:

Inputs:

Page 8 of 85

START, STOP
Characteristics: 24V active low, Pulse width ≅20ms
Outputs:
PASS, FAIL, UNDER TEST
Characteristics: Dry contact relay, Closed if true
115V, <100mA
Connector: 9 pin male D-series & Terminal Strip

Specifications (Continued)
General Features
Setup Storage:

60 Memory Locations, 10 steps each

Standard
Interfaces:

Remote I/O

Connectors:

Front and Rear Connection
HV OUTPUT: Custom Banana Socket
RTN/LOW: Banana Socket
GC (Rear Only): Binding Post/Banana Socket

Front Panel
Lockout:

10 Digit Password with or without setup recall
LED Display: LOCK

Mechanical:

Bench Mount
Dimensions:(w x h x d): 10.50 x 4.50 x 14.25 inches
262.5 x 112.5 x 356.25 mm

Weight:

25.0 lbs (11.5 kg) net, 28 lbs (13.0 kg) shipping

Environmental:

Specifications:
Operating:
Storage:
Warm-up Time:

Power:

• 90 - 130V AC
• 200 - 250V AC

• 50 or 60Hz
• 300W max

Supplied:

• Instruction Manual
• Calibration Certificate
• Ground Continuity Lead

• Power Cable
• S02 Test Leads

Safety Agency:

CE, TUV

Ordering
Information:

Description
AC Hipot Tester
AC/DC Hipot Tester
AC/DC/IR Hipot Tester

18°C to 28°C, 70% RH
0°C to + 40oC, 80% RH
-10°C to + 60oC, 80% RH
15 minutes

Catalog No.
Sentry 10 Plus
Sentry 20 Plus
Sentry 30 Plus

Page 9 of 85

Page 10 of 85

Accessories
Accessories Included
Item
AC Power Cord
Power Line Fuse 3.15A 250V SB
Power Line Fuse 1.6A 250V SB
High Voltage Lead Set, 1m with alligator clips
Ground Continuity Lead
Instruction Manual
Calibration Certificate

Quantity
1
1
1
1
1
1
1

QuadTech P/N
4200-0300
520072
520074
S02
700100
150697
N/A

Accessories/Options Available
Item
High Voltage Lead Set, high & low, 1m (std. with unit)
Corded Product Adaptor, 115V
High Voltage Lead Set, high & low, 2m
Foot Switch
High Voltage Probe
Power Entry Adaptor Cable
Gun Probe
High Voltage Lead, 1m, unterminated
High Voltage Lead, 2m, unterminated
Gun Probe with Remote Start
Load Box, resistive
Load Box, custom resistors
Interconnection Cable to Sentry 50 Ground Bond Tester
Ground Continuity Lead (standard with unit)
International Power Strip
Corded Product Adaptor, 240V

Quantity
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1

QuadTech P/N
S02
S03
S04
S05
S06
S07
S08
S09
S10
S11
S12
S14
S15
700100
G16
G25

Page 11 of 85

Page 12 of 85

Safety Precautions
WARNING
The Sentry Plus Series Hipot Tester can provide an output voltage as high as 6000V DC (5000V
AC) to the external device under test (DUT). Although the Sentry Plus unit is designed with full
attention to operator safety, serious hazards could occur if the instrument is used improperly and
these safety instructions are not followed.
1.

3.
4.
5.
6.
7.
8.

10.

11.

The Sentry Plus unit is designed for operation with its chassis connected to earth ground.
The instrument is shipped with a three-prong power cord to provide this connection to
ground. This power cord should only be plugged in to a receptacle that provides earth
ground. Serious injury can result if the Sentry Plus is not connected to earth ground.
Tightly connect cable(s) to the (blue) RTN/LOW terminal. If this is not done, the
DUT’s casing can be charged to the high voltage test level and serious injury or electrical
shock hazards could result if the DUT is touched.
Never touch the metal of the High Voltage probe directly. Touch only the insulated parts
of the lead(s).
Never touch the test leads, test fixture or DUT in any manner (this includes insulation on
all wires and clips) when the high voltage is applied and the red DANGER light is ON.
Before turning on the Sentry Plus unit, make sure there is no device (DUT) or fixture
connected to the test leads.
After each test, press the [STOP] (red) button for safety if there is any concern that HV
may still be applied to the output terminals.
When the red DANGER LED is lit or flashing, NEVER touch the device under test, the
lead wires or the output terminals.
Before touching the test lead wires or output terminals make sure:
a) The red [STOP] button has been pressed
b) The red DANGER LED is OFF.
In the case of an emergency, turn OFF the POWER switch using a “hot stick” and
disconnect the AC power cord from the wall. DO NOT TOUCH THE Sentry Plus
INSTRUMENT.
If the DANGER LED does not go off when the [STOP] button is pressed, immediately
stop using the tester. It is possible that the output voltage is still being delivered
regardless of the TEST ON/OFF control signal.
When the Sentry Plus instrument is used in remote control mode, be extremely careful.
The High Voltage Output is being turned on and off with an external signal.

Page 13 of 85

Page 14 of 85

Condensed Operating Instructions
WARNING
High Voltage is applied to the white HV Output Terminal anytime the red DANGER LED is ON
or flashing. Always make sure the DANGER LED is OFF when connecting or disconnecting
the device under test (DUT).
General Information
The Sentry Plus Series Hipot Tester is a measuring instrument for direct readout of hipot output
voltage and leakage current and insulation resistance. The voltage applied to the device under
test is adjustable from 50V to 5kV AC and 50V to 6kV DC. The trip current limit is
programmable from 1uA to 20mA AC in 1uA steps and from 0.1uA to 5mA DC in 0.1uA steps.
The output voltage for Insulation Resistance tests is 50V to 1000V DC over a measurement
range of 100kΩ to 50GΩ.
Start-Up
The Sentry Plus Series unit can be operated from a power source between 90 and 250VAC at a
power line frequency of 50 or 60Hz. The standard Sentry Plus Series unit is shipped from
QuadTech with a 3.15A fuse in place for AC 90-130V operation. (A 1.6A fuse is included for
200-250V operation). The Sentry Plus unit is shipped with the line voltage selector set for 120V.
Refer to paragraph 1.4.3 for instructions on changing the fuse or line voltage selector.
Connect the Sentry Plus Series unit AC power cord to the source of proper voltage. Operate the
Sentry Plus Series instrument with its chassis connected to earth ground. The Sentry Plus
instrument is shipped with a three-prong power cord to provide this connection to ground. This
power cord should only be plugged into a receptacle that provides earth ground. Serious injury
may result if the Sentry Plus Series instrument is not connected to earth ground.
Press the [POWER] button on the front panel to apply power. To switch the power off, press the
[POWER] button again or if measurements are to be made proceed with the Test Parameter
Setup in Table COI-1. The Sentry Plus Series instrument should warm up for 15 minutes prior to
use.
NOTE
Please read this instruction manual in its entirety before operating this instrument.
These condensed operating instructions are not a substitute for all the information provided in the
remainder of this manual.
NOTE
Refer to paragraphs 2.3 through 2.9 for a full description of programming test parameters and
instruction on how to store the test setup. Test parameters must be set before the Sentry Plus
Series instrument can be zeroed.

Page 15 of 85

Condensed Operating Instructions (Continued)
There are numerous menus within the Sentry Plus Series instruments. Familiarize yourself with
these menus prior to programming a test. Figure COI-1 illustrates the STAND BY display and
lists the functions that can be accessed by pressing the [F1] through [F4] keys.
"STAND BY" or "Power-Up" Display
Function of F1 - F4 Keys

STEP 1/1

1.250kV
15.00mA
3.0s
Instrument
Status

LOW

: OFF

ARC

: OFF

RAMP

: OFF

FALL

: OFF

PRESET

To view/change preset (initial) settings.

To view/change: memory, system, option,
cal., key lock, pw, error & about.

MORE..

To view the programmed test setups and
access offset function.

PROGRAM

PRESET

Delete
NEXT

Memory

Soft AGC.

Store

WV Auto Range

Recall

IR Auto Range

STEP: 1-10

GFI

MODE: AC/DC/IR/GC/PA

FAIL Restart

ERR

To enter programming mode.

RMT

AC-V Freq.

OFST

STAND BY

MORE..
Insert

LOCK

PROGRAM

Delete
Contrast
Buzzer Volume

High Limit

EN 50191
DC 50V AGC

Low Limit

Option

ARC Limit

Multi-Link

Ramp Time
Dwell Time

Offset

System

Voltage
Test Time

View Test Steps (Tabular Format)

(DC, IR)

Fall Time
In Rush Current (DC)

Calibration
(Need password to enter)
Key Lock
(Need password to enter)
Change Password
(Need password to enter)
Error Log
About
Manufacturer
Software version

Figure COI-1: Sentry Plus Series Menus

Page 16 of 85

Condensed Operating Instructions (Continued)
With the Sentry Plus Series instrument in “STAND BY” (or power-up display) status, follow the
steps in Table COI-1 to program an AC, DC, IR or GC test or insert a Pause in the test sequence.
STEP 1/1

"STAND BY"
DISPLAY

0.000kV
0.500mA
3.0s
STAND BY

STEP 1/1

AC
Display

VOLT

0.000kV

HIGH
TIME

:
:

0.500mA
3.0s

SELECT MODE

STEP 1/1

DC
Display

RMT

LOW

OFF

ARC
:
RAMP :

OFF
OFF

FALL

OFF

LOCK

OFF
OFF
OFF

FALL

OFF

LOCK

LOW

PROGRAM MODE DISPLAYS

OFST

OFF
OFF
OFF

VOLT

0.000kV

HIGH
TIME

:
:

0.500mA
3.0s

DWELL :
FALL :

OFF
OFF

OFF

STEP 1/1
VOLT

0.000kV

LOW
TIME

:
:

1.0MΩ
3.0s

SELECT MODE

STEP 1/1
CURR :

0.0A

HIGH :
DWELL :

1.0Ω
3.0s

SELECT MODE

STEP 1/1

PA
Display

:
ARC
RAMP :

SELECT MODE

GC
Display

OFST

ARC
:
RAMP :

LOW

I-RUS

IR
Display

RMT

LOCK

OFF

RAMP :
DWELL :

OFF
OFF

OFF

HIGH

FALL

RMT

OFST

LOCK

LOW

LOCK

OFST

ERR

OFF

OFST

ERR

PAUSE : PAUSE MODE
UNDER TEST SIGNAL : OFF

SELECT MODE

RMT

LOCK

OFST

ERR

PROGRAM

PRESET

MORE..

To change value in highlighted box.

DOWN

To toggle choices of highlighted box.

To move highlighted box around
display to select parameter to change

EXIT

To exit programming mode.

To select test mode: AC/DC/IR/GC/PA

DOWN

EXIT

DOWN

EXIT

DOWN

EXIT

DOWN

EXIT

To enter programming mode.
To view/change preset (initial)
test parameters.
To view/change system parameters:
memory, system, option, calibration, key
lock, password, error, & about.
To view the programmed test setups and
access offset function.

To select test mode: AC/DC/IR/GC/PA

Figure COI-2: “STAND BY” and PROGRAM Displays
Page 17 of 85

Condensed Operating Instructions (Continued)
Table COI-1: Test Parameter Setup
Step
1
2

Test Parameter
To enter
programming mode
Select Test Step

Select Test Mode

Set Test Voltage

Set Current (GC)
Set High Limit *

AC Hipot
[F1] =
PROGRAM
[F1] = UP
[F3] = NEXT
[F1] = UP
[F3] = NEXT
[F1] = INC.
[F3] = NEXT

DC Hipot
[F1] =
PROGRAM
[F1] = UP
[F3] = NEXT
[F1] = UP
[F3] = NEXT
[F1] = INC.
[F3] = NEXT

IR
[F1] =
PROGRAM
[F1] = UP
[F3] = NEXT
[F1] = UP
[F3] = NEXT
[F1] = INC.
[F3] = NEXT

GC
[F1] = PROGRAM

Range

[F1] = UP
[F3] = NEXT
[F1] = UP
[F3] = NEXT
[F1] = INC.
[F3] = NEXT

1-10

[F1] = INC.
[F3] = NEXT

[F1] = INC.
[F3] = NEXT
[F1] = INC.
[F3] = NEXT

[F1] = INC.
[F3] = NEXT

[F1] = INC.
[F3] = NEXT
[F1] = INC.
[F3] = NEXT

[F1] = NEW
OR
[F4] = EXIT

[F1] = INC.
[F3] = NEXT
[F1] = NEW
OR
[F4] = EXIT

[F1] = NEW
OR
[F4] = EXIT

Set Low Limit (IR)
6

Set Test Time

Set Dwell (GC) ***
Set Low Limit **
Set High Limit (IR)

Set ARC Limit

Set Ramp Time

Set Dwell Time***

Set Fall Time

Set In-Rush Current

13a

To program next test
step OR
To exit
programming mode

13b

* High limit decision is made throughout test time.
** Unit will make low limit decision at the end of test.
* ** Limits will be checked at end of dwell time.

Page 18 of 85

[F1] = NEW
OR

AC, DC, IR, GC, PA
0.05-5kV AC
0.05-6kV DC
0.05-1kV IR
0.1A GC
0.001-20mA AC
0.0001-5mA DC
0.1-50000MΩ IR
0, 0.1-5Ω GC
0, 0.1-999s AC
0, 0.1-999s DC
0, 0.1-999s IR
0.1-1s GC
0-20mA AC
0-5mA DC
0-50GΩ IR
0-5Ω GC
1-20mA AC
1-5mA DC
0-999s AC
0-999s DC
0-999s IR
0-999s DC
0-999s IR
0-999s AC
0-999s DC
0-999s IR
0, 0.5uA-5mA DC
Program next step
OR
Exit programming

Condensed Operating Instructions (Continued)
Offset
After setting your test parameters, zero the Sentry Plus Series instrument by using the automatic
offset. With no device connected, connect the appropriate cable (or other fixture) into the
OUTPUT connectors. Refer to paragraph 2.13 cable connections based on test to be performed.
Return and HV test leads should not be connected together (open circuit) for AC and DC hipot
tests. Return and GC test leads should be connected (short circuit) for a GC test. There is no
offset in an IR test.
NOTE:
If Ground Continuity (GC) is turned ON when performing an offset, the continuity lead must be connected to the
return (RTN/LOW) terminal, otherwise turn the continuity test OFF.

Prior to performing the OFFSET function:
•
•
•

Allow the instrument to warm up for 15 minutes.
Connect the Test cables (or fixture) to the front panel OUTPUT and RTN/LOW connectors.
Program the test steps.

With the instrument in STAND BY status:
•
•
•
•
•
•
•

Press [F4] = MORE
Press [F3] = OFFSET
Follow instructions on display: i.e.: connect OPEN across OUTPUT terminal.
Press green [START] button.
Wait while instrument gets OFFSET value.
The OFST block at the bottom of the display is now highlighted (back lit).
Press [F4] = MORE to return to STAND BY status.
STOP

QuadTech
1.

Sentry 30 Plus AC/DC/IR Hipot Tester

Please open the HV output terminal

F1
F2

START

No offset in IR mode.

F3
F3

PRESS START KEY TO GET OFFSET..

CAL

UPDATE

PASS

FAIL

OUTPUT

DANGER

RTN/LOW

CAUTION
Max 5kVAC
6kVDC

When ready, press [START] to get offset values

OPEN
-

Figure COI-3: Zero/Offset OPEN Configuration

Page 19 of 85

Condensed Operating Instructions (Continued)
Connection to Device under Test (DUT)
Figure COI-4 illustrates the connection of the Sentry Plus Series unit to a single DUT using the
S02 1-meter HV cable set that comes standard with the instrument. The custom white banana
plug/red alligator clip is connected between the OUTPUT terminal on the Sentry Plus Series unit
and the high side of the device under test. The black banana plug/alligator clip is connected
between the RTN/LOW terminal on the Sentry Plus Series unit to the low side of the DUT.
STOP

QuadTech
M1

START

LOW: OFF
ARC: OFF

1.250kV
0.500mA
3.0s
STAND BY

CAL

Sentry 30 Plus AC/DC/IR Hipot Tester

STEP 1/5

RAMP: OFF
FALL: OFF

RMT

UPDATE

LOCK

PASS

FAIL

OFST

ERR

PROGRAM

PRESET

MORE..

OUTPUT

DANGER

RTN/LOW

CAUTION
Max 5kVAC
6kVDC

S02
Cable
Set

+
DUT

COI-4: Connection to Device under Test
Measurement Mode
1.
2.
3.
4.
5.

Turn [POWER] ON.
Allow Sentry Plus Series instrument a 15-minute warm up time.
Connect S02 Black ground cable to Sentry Plus Series unit RTN/LOW terminal
Connect S02 White/red HV cable to Sentry Plus Series unit OUTPUT terminal.
Press [F1] = PROGRAM and enter test parameters. When finished programming, press
[F4] = EXIT to return to STAND BY status.
6. Press [F4] = MORE to access Offset function. Press [F3] = OFFSET. Follow Offset
instructions. When Offset is complete, press [F4] = MORE to return to STAND BY.
7. Connect device under test (DUT) to test leads.
8. Press [START].
9. Record measurement.
10. Press [STOP].

Page 20 of 85

Section 1: Introduction
1.1

Unpacking and Inspection

Inspect the shipping carton before opening. If damaged, contact the carrier agent immediately.
Inspect the Sentry Plus Series instrument for any damage. If the instrument appears damaged or
fails to meet specifications notify QuadTech (refer to instruction manual front cover) or its local
representative. Retain the original shipping carton and packing material for future use such as
returning the instrument for recalibration or service.
1.2

Product Overview

The Sentry Plus Series is available in three models, the 10, 20 and 30, all of which provide AC
Hipot testing capability. Additionally, the Sentry 20 & 30 Plus instruments provide DC Hipot
testing. The Sentry 30 Plus unit provides Insulation Resistance testing. The hipot test can be
programmed over a voltage range of 0.05 to 5kV AC and 0.05 to 6kV DC with a min/max
leakage current detection range of 0.001 to 20mA AC and 0.0001 to 5mA DC. Insulation
resistance measurements are possible to 50GΩ at programmable DC test voltages between 50
and 1000V. Each instrument comes standard with programmable ground continuity, internal
storage containing 60 memory locations (10 steps each) and a remote interface with start/stop
inputs & pass/fail outputs.

Figure 1-1: Sentry 30 Plus AC/DC/IR Hipot Tester
UL Requirements
The Sentry Plus Series instruments meet the requirements outlined by UL for Hipot Testers. The
Sentry Plus indicates the test potential (test voltage), has both visual and audible indication of
failure and the STOP switch must be manually pressed prior to another measurement being
made. The Sentry Plus Series instrument has a 100VA output [(5000V * 20mA) = 100VA]. The
Sentry Plus Series instrument also measures and displays the output voltage directly at the output
terminals during the test.

Introduction

Page 21 of 85

1.3

Controls and Indicators

1.3.1

Front Panel Controls and Indicators

Figure 1-2 illustrates the controls and indicators on the front panel of the Sentry Plus Series
AC/DC/IR Hipot Tester. Table 1-1 identifies them with description and function.
4
STOP

QuadTech

Sentry 30 Plus AC/DC/IR Hipot Tester

F1
F2

START

F3
F3

CAL

UPDATE

PASS

FAIL

OUTPUT

DANGER

RTN/LOW

CAUTION

Max 5kVAC
6kVDC

12 11

Figure 1-2: Sentry 30 Plus Front Panel Controls & Indicators
Table 1-1: Sentry 30 Plus Front Panel Controls & Indicators
Reference
Number
Figure 1-2
1
2
3
4

Name

Type

Function

Power
START
STOP
Display

Green Push Button
Green Push Button
Red Push Button
LCD

F1, F2, F3
and F4

Gray Push Buttons

OUTPUT

RTN/LOW

White Custom
Banana Socket
Blue Banana Socket

Apply AC Power: 1=ON, 0=OFF
Initiate Test: HV applied to OUTPUT terminal
Stop Test: HV terminated at OUTPUT terminal
Program Menu, Test Setup, Measurement Results,
Memory Contents, Calibration
Select Instrument Functions
Keys perform different functions under different menus.
Right side of display shows corresponding key function.
High Voltage (Potential) Terminal

8
9

DANGER
FAIL

Red LED
Red LED

10
11
12

PASS
UPDATE
CAL

Green LED
Recessed P-B
Recessed P-B

Page 22 of 85

RTN: Low voltage reference terminal
LOW: Common ground reference terminal
When lit, high voltage is present at OUTPUT terminals
When lit, DUT judged as FAIL. Output voltage is
immediately cut off. Press [STOP] to disable FAIL LED
When lit, DUT judged as PASS
Qualified Service Personnel Only
Enable/Disable Instrument Calibration

Introduction

1.3.2

Rear Panel Controls and Connectors

Figure 1-3 illustrates the controls and connectors on the rear panel of the Sentry Plus Series
AC/DC/IR Hipot Tester. Table 1-2 identifies them with description and function.
2
!

WARNING: FOR CONTINUED PROTECTION
AGAINST FIRE HAZARD, REPLACE ONLY WITH
THE SAME TYPE AND RATING OF FUSE AS
SPECIFIED FOR THE LINE VOLTAGE BEING
UTILIZED.

CAUTION: NO OPERATOR SERVICEABLE PARTS
INSIDE. REFER SERVICING TO QUALIFIED
PERSONNEL.

6
FAN 50o C AUTO ON/OFF

POLLUTION DEGREE 2
INSTALLATION CATEGORY II

VOLTAGE SELECTOR
90V - 110V ~

108V - 132V ~
198V - 242V ~
216V - 250V ~

CONT. CHECK OPTION

3.15AT
250V

START

1.6AT
250V

RESET

COM

MODEL NO.

100V/120V/220V/240V~
50/60Hz 300W MAX

SERIAL NO.

INTER
LOCK

HIGH VOLTAGE
Max 5kVAC/6kVDC

HV OUTPUT

RTN/LOW

Figure 1-3: Rear Panel Sentry Plus Series Instrument
Table 1-2: Sentry Plus Series Rear Panel Controls & Connectors
Reference #
Figure 1-3
1

Name

Type

Function

VOLTAGE
SELECTOR

2 Red 2-position
Slide Switches

Remote

3
4
5

CONT CHK OPT.
TUV CE
Remote

Fan

7
8

Ground
AC Line Input

RTN/LOW

Silver 9-pin
D-Type Connector
Black banana plug
Sticker
Black 5-screw
Terminal Strip
SF11580AT
115V 50/60Hz 0.10A
Silver Banana Plug
Black 3-wire inlet
module & fuse holder
Blue Banana Socket

Select Voltage Level corresponding to AC Source
90V – 110V: 3.15A 250V Slow Blow
110V – 130V: 3.15A 250V Slow Blow
200V – 240V: 1.6A 250V Slow Blow
220V – 250V: 1.6A 250V Slow Blow
Remote Connection: Inputs: Start, Reset
Outputs: Pass, Fail, Under Test
Connection for Ground Continuity Check
Instrument Safety Agency Listing
Remote Connection: Start, Reset, Com, Interlock

HV OUTPUT

Introduction

White Custom
Banana Socket

Cool Unit: T≥50°C = ON, T<45°C = OFF
Instrument Chassis Ground Connection
Connection to AC power source
Fuse Drawer: 3.15A 250V or 1.6A 250V (see #1)
RTN: Low voltage reference terminal
LOW: Common ground reference terminal
Rear panel High Voltage (Potential) Terminal

Page 23 of 85

1.4

Installation

1.4.1

Dimensions

The Sentry Plus series unit is supplied in a bench configuration, i.e., in a cabinet with resilient
feet for placement on a table. Flip feet are provided under the front feet so that the Sentry Plus
instrument can be tilted up for convenient operator viewing.

4.50"
112.50mm
STOP

QuadTech

Sentry 30 Plus AC/DC/IR Hipot Tester
F1

F2
START

F3
F3
F4

CAL

UPDATE

PASS

FAIL

OUTPUT

DANGER

RTN/LOW
CAUTION
Max 5kVAC
6kVDC

14.25"
356.25mm

10.50"
262.5mm

Figure 1-4: Sentry Plus Series Instrument Dimensions

1.4.2

Instrument Positioning

The Sentry Plus unit contains a graphic display for direct readout of measured parameters. The
optimum angle for viewing is slightly down and about 10 degrees either side of center. For
bench operation the front flip feet should always be used to angle the instrument up. In bench or
rack mount applications the instrument should be positioned with consideration for ample air
flow around the rear panel fan ventilation hole. An open space of at least 3 inches (75mm) is
recommended behind the rear panel. Testing should be performed on a non-conductive surface.
An ESD mat is not a recommended test platform.
1.4.3

Power Requirements

The Sentry Plus instrument can be operated from a power source of 90 to 132V AC or 198 to
250V AC. Power connection is via the rear panel through a standard receptacle. Before
connecting the 3-wire power cord between the unit and AC power source, make sure the voltage
selection switches on the rear panel (Figure 1-5) are in accordance with the power source being
used. For a 90-132V source, use a 3.15A 250V fuse. For a 198-250V source, use a 1.6A 250V
fuse. Always use an outlet that has a properly connected protection ground.

Page 24 of 85

Introduction

WARNING
MAKE SURE THE UNIT HAS BEEN DISCONNECTED FROM ITS AC POWER SOURCE
FOR AT LEAST FIVE MINUTES BEFORE PROCEEDING.
Procedure For Changing A Sentry Plus Series Fuse
Remove the fuse drawer, by pressing the black tab located at the center of the extended
fuse drawer, just below the 3-prong receptacle, and pull outward.
Once the fuse drawer has been removed from the instrument slide out the fuse from the holder
and replace. Make sure the new fuse is of the proper rating. Note that the fuse drawer can also
be used to store a spare fuse.
Install the fuse drawer back in the inlet module by pushing in until it locks securely in place.
100V/120V/220V/240V~
50/60Hz 300W MAX

VOLTAGE SELECTOR

90V - 110V ~
108V - 132V ~
198V - 242V ~

3.15AT
250V

FUSE Drawer
1.6AT
250V

216V - 250V ~

Figure 1-5: Close-Up of Sentry Plus Series Rear Panel
1.4.4

Safety Inspection

Before operating the instrument inspect the power inlet module on the rear of the Sentry Plus to
ensure that the properly rated fuse is in place, otherwise damage to the unit is possible. Make
sure that the voltage selector switches are set in accordance with the power source in use. Refer
to paragraph 1.4.3 and Figure 1-5.
The Sentry Plus instrument is shipped with a standard U.S. power cord, QuadTech P/N 42000300 (with Belden SPH-386 socket or equivalent, and a 3-wire plug conforming to IEC 320).
Make sure the instrument is only used with these cables (or other approved international cord
set) to ensure that the instrument is provided with connection to protective earth ground.
The surrounding environment should be free from excessive dust to prevent contamination of
electronic circuits. The surrounding environment should also be free from excessive vibration.
Do not expose the Sentry Plus instrument to direct sunlight, extreme temperature or humidity
variations, or corrosive chemicals.

Introduction

Page 25 of 85

Section 2: Operation
2.1

Terms and Conventions
Table 2-1: Measurement Unit Prefixes

Multiple

Scientific

Engineering

Symbol

1000000000000000
1000000000000
1000000000
1000000
1000
.001
.000001
.000000001
.000000000001
.000000000000001

1015
1012
109
106
103
10-3
10-6
10-9
10-12
10-15

Peta
Tera
Giga
Mega
Kilo
milli
micro
nano
pico
femto

P
T
G
M
k
m
u
n
p
f

ARCing:

Sparking or ‘flashing over’ caused by a breakdown of electrical
insulation.

Current:
AC:

Alternating Current. AC is an electrical current that has one
polarity during part of the cycle and the opposing polarity during
the other part of the cycle. Residential electricity is AC.

DC:

Direct Current. Non-reversing polarity. The movement of charge
is in one direction. Used to describe both current and voltage.
Batteries supply direct current (DC).

Charging Current:

An insulated product exhibits the basic characteristics of a
capacitor. Application of a voltage across the insulation causes a
current to flow as the capacitor charges.
This current
instantaneously rises to a high value as voltage is applied then
exponentially decays to zero as the DUT becomes fully charged.
Charging current decays to zero much faster than dielectric
absorption.

Operation

Page 27 of 85

Dielectric Absorption:

The physical phenomenon in which insulation appears to absorb
and retain an electrical charge slowly over time. Apply a voltage
to a capacitor for an extended period of time. Then quickly
discharge it to zero voltage. Leave the capacitor open circuited
for a period of time then connect a voltmeter to it and measure the
residual voltage. The residual voltage is caused by the dielectric
absorption of the capacitor.

Dielectric Strength:

The ratio between the voltage at which breakdown of the insulating
material occurs and the distance between the two points subject to
the applied voltage.

Dielectric Withstand Test:

This is the most common electrical safety test performed. A high
voltage (either AC or DC) is applied to determine if a breakdown
will occur in the insulation of the DUT. Dielectric Withstand is
also referred to as a hipot (high potential) test.

Discharge:

The act of draining off an electrical charge to ground. Devices that
retain charge should be discharged after an IR test or DC hipot test.

DUT:

Device Under Test. (i.e. the product being tested).

Frequency:

The rate at which current or voltage reverses polarity and then
back again completing a full cycle, measured in Hertz (Hz) or
cycles/second. AC Line Frequency = 50/60 Hz.

Ground:
Ground:

The base reference from which voltages are measured, nominally
the same potential as the earth. Ground is also the side of a circuit
that is at the same potential as the base reference.

Ground Bond Test:

Test to verify that all conductive parts of a product that are
exposed to user contact are connected to the power line ground.
The ground bond test verifies the integrity of the ground
connection using a high current AC signal with current level as
high as 30Amps. Ground bond provides a better simulation of how
a product will perform under an actual fault condition.

Ground Continuity:

Test to verify that all conductive parts of a product that are
exposed to user contact are connected to the power line ground.
GC Test normally performed with a low current DC signal that
checks to ensure the ground connection has a resistance of <1Ω.

Page 28 of 85

Operation

Insulation Resistance:

Measures the total resistance between any two points separated by
electrical insulation. The IR test determines how effective the
dielectric (insulation) is in resisting the flow of electrical current.

Interface:
IEEE-488:

General Purpose Interface Bus (GPIB). GPIB is an industry
standard definition of a Parallel bus connection for the purpose of
communicating data between devices.

RS232:

An industry standard definition for a Serial line communication
link or port.

Scanner:

An electronic device designed to switch or matrix signals.

Leakage Current (LC):
Leakage Current:

The residual flow of current that flows through the insulation after
a high voltage has been applied for a period of time. The leakage
current is equal to the applied voltage divided by the insulation
resistance. Leakage current is the main measured value for AC
hipot and DC hipot.

Applied Part LC Test:

A line leakage current test that measures the current that would
flow from, to or between applied parts such as sensor and patient
leads. This test is the most complicated and time-consuming line
leakage test.

Earth LC Test:

The most important and most common of the line leakage tests.
Earth leakage current is basically the current flowing back through
the ground conductor on the power cord. It is measured by
opening the ground conductor, inserting a circuit with the
simulated impedance of the human body then measuring the
voltage across part of the circuit with a true RMS voltmeter.

Enclosure LC Test:

A line leakage test that measures the current that flows through the
human body if the body had touched the enclosure of the DUT.

Line LC Test:

A line voltage leakage current test simulates the effect of a person
touching exposed metal parts of a product and detects whether or
not the leakage current that flows through the person’s body
remains below a safe level. Apply power to the product being
tested, then measure the leakage current from any exposed metal
on the chassis of the product under a fault conditions such as “no
ground”. A special circuit is used to simulate the impedance of the
human body.

Operation

Page 29 of 85

Limits:
High Limit:

The upper value for a test to be considered a pass. If the measured
value is higher than the high limit the test is considered a fail. In
hipot, leakage current and ground bond test modes a high limit is
required.

Low Limit:

The lower value for a test to be considered a pass. If the measured
value is lower than the low limit the test is considered a fail. In
insulation resistance test mode a low limit is required. In an AC or
DC Hipot test, the low limit FAIL decision occurs at the end of the
programmed test time.

Mode:

The test to be performed such as: AC Hipot (AC), DC Hipot (DC),
Insulation Resistance (IR), Ground Continuity (GC) or Pause (PA).

Step:

The order in which the tests will be performed. For example if
step 1 is a ground continuity test, step 2 an AC hipot and step 3 an
insulation resistance measurement then when the START button is
pressed, the Sentry will perform a GC test followed by an AC test
then an IR test.

Test Time:
Ramp:
Dwell:
Test:
Fall:
Test Current:
Real Current:

Total Current:

The period of time for the voltage to climb to programmed level.
The period of time for the voltage to settle at programmed level.
The period of time that the voltage is applied to the DUT.
The period of time for the voltage to decrease back to 0.

The resistive current component of the device under test. The
resistive component is attributed to the resistance of the device’s
insulation.
A measure of the resistive and reactive current components of the
device under test. The reactive component is attributed to the
capacitive or inductive components of the circuit
Total Current "A"
Total Current "B"

Reactive
(Capacitive)
Current
Component

Total Current

"A"
Real "B"
Real "A"
Total "B"
Total "A"
Reactive "B"
Reactive "A"

Page 30 of 85

"B"
=
=
=

200
100
101
100
100
100

Real
(Resistive)
Current
Component
> 100% Change
> 1% Change
> 0% Change

Operation

2.2

Startup

Check to make sure the Red Voltage Selector Switches on the rear panel agree with the power
source available. Depending on the power source the switch positions should be in the up or
down positions as shown in Figure 1-5 (Close-Up of Sentry Plus Series Rear Panel).
WARNING
NEVER TOUCH THE TEST LEADS IN ANY MANNER (this includes insulation on all wires and clips) when
HIGH VOLTAGE IS APPLIED and red DANGER LED is ON.
USE ALL PRECAUTIONS NECESSARY TO AVOID TOUCHING THE DEVICE UNDER TEST WHEN THE
RED DANGER LED IS ON OR FLASHING.

Connect the instrument power cord to the source of proper voltage. The instrument is to be
used only with three-wire grounded outlets.
Power is applied to the Sentry Plus Series instrument by pressing the green [POWER] switch on
the front panel to the ON (1 position). The Sentry Plus Series unit should warm up for a period
of at least 15 minutes prior to use.
WARNING
DO NOT TURN INSTRUMENT POWER ON OR OFF WITH TEST DEVICES CONNECTED.

2.3

Programming Electrical Safety Tests

The Sentry Plus Series instrument is capable of performing the tests listed in Table 2-2. A
single-step test can be performed on a device and is programmed as described in paragraphs 2.4
– 2.8. When the device under test requires a multi-step test the order of test precedence is
important. Refer to paragraph 2.9 for test setup store/recall instructions and to paragraph 2.10 for
instructions on programming a multi-step test.
Table 2-2: Sentry Plus Series Electrical Safety Tests
Test

Software
Designation

Ground Continuity
AC Hipot
DC Hipot
Insulation Resistance
Pause
Storing a Test Setup
Multi-Step

GC
AC
DC
IR
PA

Programming
Instructions
Paragraph
2.4
2.5
2.6
2.7
2.8
2.9
2.10

Sentry Plus Series
Instrument
10, 20, 30
10, 20, 30
20, 30
30
10, 20, 30
10, 20, 30
10, 20, 30

NOTE:
This manual is set up so if you follow the instructions in paragraphs 2.4 through 2.9 and you will
have programmed a 5-step test setup and stored it to memory location 1.

Operation

Page 31 of 85

Function keys of the STAND BY Display
The function keys on the right hand side of the display allow the operator to access the numerous
menus imbedded within the Sentry Plus Series instrument software. Familiarize yourself with
these menus prior to programming a test. Figure 2-1 illustrates the STAND BY display and lists
the functions that can be accessed by pressing the [F1] through [F4] keys.
"STAND BY" or "Power-Up" Display
Function of F1 - F4 Keys

STEP 1/1

1.250kV
15.00mA
3.0s
Instrument
Status

LOW

: OFF

ARC

: OFF

RAMP

: OFF

FALL

: OFF

PRESET

To view/change preset (initial) settings.

To view/change: memory, system, option,
cal., key lock, pw, error & about.

MORE..

To view the programmed test setups and
access offset function.

PROGRAM

PRESET

Memory

Insert

Soft AGC.

Store

Delete

WV Auto Range

Recall

IR Auto Range

STEP: 1-10

GFI

MODE: AC/DC/IR/GC/PA

FAIL Restart

ERR

To enter programming mode.

RMT

AC-V Freq.

OFST

STAND BY

MORE..

LOCK

PROGRAM

Delete
Contrast
Buzzer Volume

High Limit

EN 50191
DC 50V AGC

Low Limit

Option

ARC Limit

Multi-Link

Ramp Time
Dwell Time

Offset

System

Voltage
Test Time

View Test Steps (Tabular Format)

Calibration
(DC, IR)

Fall Time

(Need password to enter)
Key Lock

In Rush Current (DC)

(Need password to enter)
Change Password
(Need password to enter)
Error Log
About
Manufacturer
Software version

Figure 2-1: STAND BY Function Key Menus

Page 32 of 85

Operation

POWER UP and STAND BY Displays
The Sentry Plus Series instruments have multiple menus or displays that may seem confusing at
first glance. In an attempt to clarify the numerous functions of the software, this instruction
manual will illustrate these displays in a (hopefully) logical format. The function keys (F1, F2,
F3 & F4) perform different tasks depending upon the menu currently shown on the display.
Figure 2-2 illustrates the instrument display when the instrument is initially turned on.
Model #

Software

Function of F1 - F4 Keys

SENTRY PLUS 30 VERSION X.XX
DATA MEMORY CHECK
CALIBRATION DATA
AC LINE FREQUENCY

Memory
Calibration
Line Frequency

WAIT 3s

:
:
:

RMT

PASS
PASS
60 Hz
LOCK

F2
F3

OFST

ERR

EXIT

Power Up Display: Instrument Initialization

Figure 2-2: Power-Up Display
After 3 seconds, the instrument display reverts to the STAND BY display as illustrated in Figure
2-3. The box in the lower left hand corner denotes the instrument status.

Test Voltage (kV)
Test Current (mA)
Test Time (sec)

Memory
Location Mx
x = 1-60

Test Step 1/x
x = 1-10

Test Mode
AC, DC, IR,
GC or PA

STEP 1/1

1.250kV
15.00mA
3.0s
STAND BY
Instrument Status
STAND BY

RMT
Remote
Status
On/Off

Function
of
F1 - F4 Keys

Test
Settings

LOW : OFF
ARC : OFF

PROGRAM

RAMP: OFF
FALL: OFF

PRESET

MORE..

LOCK
Front
Panel
Lock Out
Status
On/Off

OFST
Offset
Status
On/Off

ERR

Error
Status
On/Off

When box is highlighted (back lit),
the function is ON.

Figure 2-3: STAND BY Display
To access the programming function of the Sentry Plus Series instrument in the STAND BY
menu, press the [F1] key (PROGRAM). Once in the PROGRAM display, select the test step
then the test mode (AC, DC, IR, GC or PA). Paragraphs 2.4 - 2.8 illustrate how to program the
specific parameters of each of the 5 tests.
NOTE
This manual is set up so if you follow the instructions in paragraphs 2.4-2.9 you will have programmed a 5-step test
(GC, AC, DC, IR and PA) and saved to memory location 1.

Operation

Page 33 of 85

PROGRAM Mode Displays
Figure 2-4 illustrates each program mode display for quick reference. The box in the lower left
hand corner denotes the instrument status. For clarity, a green arrow (!) is used to denote
which function key (F1 – F4) is pressed to get to the next display screen.
STEP 1/1

"STAND BY"
DISPLAY

0.000kV
0.500mA
3.0s
STAND BY

STEP 1/1

AC
Display

VOLT

0.000kV

HIGH
TIME

:
:

0.500mA
3.0s

SELECT MODE

STEP 1/1

DC
Display

RMT

LOW

OFF

ARC
:
RAMP :

OFF
OFF

FALL

OFF

LOCK

OFF
OFF
OFF

FALL

OFF

LOCK

LOW

PROGRAM MODE DISPLAYS

OFST

OFF
OFF
OFF

VOLT

0.000kV

HIGH
TIME

:
:

0.500mA
3.0s

DWELL :
FALL :

OFF
OFF

OFF

STEP 1/1
VOLT

0.000kV

LOW
TIME

:
:

1.0MΩ
3.0s

SELECT MODE

STEP 1/1
CURR :

0.0A

HIGH :
DWELL :

1.0Ω
3.0s

SELECT MODE

STEP 1/1

PA
Display

:
ARC
RAMP :

SELECT MODE

GC
Display

OFST

ARC
:
RAMP :

LOW

I-RUS

IR
Display

RMT

LOCK

OFF

RAMP :
DWELL :

OFF
OFF

OFF

HIGH

FALL

RMT

OFST

LOCK

LOW

LOCK

OFST

ERR

OFF

OFST

ERR

PAUSE : PAUSE MODE
UNDER TEST SIGNAL : OFF

SELECT MODE

RMT

LOCK

OFST

ERR

PROGRAM

PRESET

MORE..

To change value in highlighted box.

DOWN

To toggle choices of highlighted box.

To move highlighted box around
display to select parameter to change

EXIT

To exit programming mode.

To select test mode: AC/DC/IR/GC/PA

DOWN

EXIT

DOWN

EXIT

DOWN

EXIT

DOWN

EXIT

To select test mode: AC/DC/IR/GC/PA

Figure 2-4: STAND BY & PROGRAM Mode Displays

Page 34 of 85

Operation

2.4

Programming a Ground Continuity Test

This test is applicable to the Sentry 10, 20 and 30 Plus instruments. A Ground Continuity (GC)
test is usually done first to verify the ground connection before high voltage is applied in the AC
& DC Hipot tests. With the instrument in ‘stand-by’ status, press [F1] = PROGRAM. The AC
test mode programming screen is displayed. Follow the green arrows (!) on the right side of
this diagram to program the individual GC test parameters.
STEP: 1/1

In STAND BY:
Press [F1] =
PROGRAM

VOLT:

0.000 kV

HIGH:
TIME:

0.500 mA
3.0 s

Voltage is 0

STEP 1/1

Select
GC
Mode

CURR:

0.0 A

HIGH:
DWELL:

1.0 Ω
0.3 s

Select Mode

STEP 1/1

Set
Current

CURR:

0.0A

HIGH:
DWELL:

1.0Ω
0.3s

0.1A

RMT

STEP 1/1

Set
HIGH
Resistance Limit

CURR:

0.1A

HIGH:
DWELL:

1.0Ω
0.3s

0.1 - 5Ω

RMT

LOW

OFF

ARC
RAMP

:
:

OFF
OFF

FALL

OFF

LOCK

LOW

LOCK

LOW

LOCK

LOW

LOCK

OFST

ERR

OFF

OFST

ERR

OFF

OFST

ERR

OFF

OFST

ERR

MORE..

EXIT

DOWN

EXIT

INC.

DEC.

EXIT

INC.

DEC.

EXIT

To move highlighted box to AC.

To select Mode = GC

To move highlighted box to CURR.

To set current to 0.1A

To move highlighted box to HIGH.

To set High resistance limit:
0.1 - 5Ω in 0.1Ω increments.

To move highlighted box to DWELL.

Continue on Next Page.

Operation

Page 35 of 85

Programming a GC Test (continued):
STEP 1/1

Set
DWELL
Time

CURR:

0.1A

HIGH:
DWELL:

1.2Ω
0.3s

0.1 - 1s

RMT

STEP 1/1

Set
LOW
Resistance Limit

CURR:

0.1A

HIGH:
DWELL:

1.2Ω
0.5s

0 - 5Ω

CURR:

0.1A

HIGH:
DWELL:

1.2Ω
0.5s

1 - 10

RMT

STEP: 1/1

[F1] : Program Step 2
or
[F4] : Exit Program Mode

RMT

LOW

LOCK

LOW

LOCK

LOW

LOCK

OFF

OFST

OFF

OFST

ERR

0.3Ω

OFST

ERR

INC.

DEC.

EXIT

INC.

DEC.

EXIT

NEW

MORE..

EXIT

To set Dwell time:
0.1 - 1s in 0.1s increments

To move highlighted box to LOW.

To set Low resistance limit:
0 - 5Ω in 0.1Ω increments.

To move highlighted box to STEP.

To go to Step 2.

To exit programming mode and return
to STAND BY status.

END GC Test Programming. After selecting the LOW resistance limit, one can either press
[F1] = NEW to change the step number in the highlighted box (1-10) and start programming
STEP 2-10 OR one can press [F4] = EXIT to exit programming function and return to STAND
BY status.
For this example, press [F1] = NEW and proceed to program step 2 as an AC Hipot Test (¶ 2.5).

Page 36 of 85

Operation

2.5

Programming an AC Hipot Test

This test is applicable to the Sentry 10, 20 and 30 Plus instruments. With the instrument in
‘stand-by’ status, press [F1] = PROGRAM. If continuing the 5-step example from ¶2.4, you are
already in program mode and on the AC test mode page. Follow the green arrows (!) on the
right side of this diagram to program the individual AC hipot test parameters.
STEP 2/2

[F1] = New
Program
Step 2 = AC

VOLT

0.000kV

HIGH
TIME

:
:

0.500mA
3.0s

Voltage is 0

STEP 2/2

Select
AC
Test Mode

VOLT

0.000kV

HIGH
TIME

:
:

0.500mA
3.0s

Select Mode

STEP 2/2

Set
Test Voltage

VOLT

0.000kV

HIGH
TIME

:
:

0.500mA
3.0s

0.05 - 5kV

VOLT

2.750kV

HIGH
TIME

:
:

0.500mA
3.0s

0.001 - 20mA

STEP 2/2

Set
Test Time
Test time = 0
then continuous
voltage until STOP
is pressed.

VOLT

2.750kV

HIGH
TIME

:
:

15.00mA
3.0s

0, 0.1 - 999s

STEP 2/2

Set
Low Current
Limit

RMT

STEP 2/2

Set
High Current
Limit

VOLT

2.750kV

HIGH
TIME

:
:

15.00mA
10.0s

0 - 20mA 0 = OFF

RMT

LOW

OFF

ARC
RAMP

:
:

OFF
OFF

FALL

OFF

LOCK

OFST

LOW

OFF

ARC
RAMP

:
:

OFF
OFF

FALL

OFF

LOCK

OFST

LOW

OFF

ARC
RAMP

:
:

OFF
OFF

FALL

OFF

LOCK

OFST

LOW

OFF

ARC
RAMP

:
:

OFF
OFF

FALL

OFF

LOCK

OFST

LOW

OFF

ARC
RAMP

:
:

OFF
OFF

FALL

OFF

LOCK

OFST

LOW

OFF

ARC
RAMP

:
:

OFF
OFF

FALL

OFF

LOCK

OFST

ERR

FIRST

To change value in highlighted box.

MORE..

To delete or insert a test step.

To move highlighted box around
display to select parameter to change

EXIT

To exit programming mode.

Set MODE = AC

DOWN

EXIT

INC.

DEC.

EXIT

INC.

DEC.

EXIT

INC.

DEC.

ENTER

EXIT

INC.

DEC.

EXIT

To move highlighted box to VOLT

To set test voltage:
0.05 - 5kV in .001kV increments

To move highlighted box to HIGH.

To set high current limit:
0.001 - 20mA in .001mA increments

To move highlighted box to TIME.

To set test time:
0, 0.1 - 999s in 0.1s increments

To move highlighted box to LOW.

To set low current limit:
0 - 20mA in 0.01mA increments

To move highlighted box to ARC.

Continue on next page.

Operation

Page 37 of 85

Programming an AC Hipot Test (continued)
STEP 2/2

Set
Arc Limit

VOLT

2.750kV

HIGH
TIME

:
:

15.00mA
10.0s

1 - 20mA 0 = OFF

STEP 2/2

Set
Ramp Time

VOLT

2.750kV

HIGH
TIME

:
:

15.00mA
10.0s

0 - 999s 0 = OFF

STEP 2/2

Set
Fall Time

VOLT

2.750kV

HIGH
TIME

:
:

15.00mA
10.0s

[F1] : Program Step 3
or
[F4] : Exit Program Mode

STEP

2/2

VOLT

2.750kV

HIGH
TIME

:
:

15.00mA
10.0s

1 - 10

RMT

0 - 999s 0 = OFF

Set
Next
Test Step

RMT

LOW

3.00mA

ARC
RAMP

:
:

OFF
OFF

FALL

OFF

LOCK

OFST

LOW

: 3.00mA

ARC
RAMP

:
:

OFF
OFF

FALL

OFF

LOCK

OFST

LOW

: 3.00mA

ARC
RAMP

:
:

OFF
3.0s

FALL

OFF

LOCK

OFST

LOW

: 3.00mA

ARC
RAMP

:
:

OFF
3.0s

FALL

3.0s

LOCK

OFST

ERR

INC.

DEC.

EXIT

INC.

DEC.

EXIT

INC.

DEC.

EXIT

NEW

MORE..

EXIT

Set arc current limit:
1-20mA in 0.1mA increments

To move highlighted box to RAMP.

To set Ramp Time:
0 - 999s in 0.1s increments

To move highlighted box to FALL.

To set Fall Time:
0 - 999s in 0.1s increments

To move highlighted box to STEP.

To set next test step = 3

To exit programming mode and return
to STAND BY status.

END AC Hipot Test Programming. After selecting the FALL Time, one can either press [F1]
= NEW to change the step number in the highlighted box (1-10) and start programming STEP 310, OR one can press [F4] = EXIT to exit programming function and return to STAND BY
status.
For this example, press [F1] = NEW and proceed to program step 3 as a DC Hipot Test (¶ 2.6).

Page 38 of 85

Operation

2.6

Programming a DC Hipot Test

This test is applicable to the Sentry 20 and 30 Plus instruments. With the instrument in ‘standby’ status, press [F1] = PROGRAM. If continuing the 5-step example from ¶2.5, you are already
in program mode and on the AC test mode page. The example illustrated herein shows a GC test
as Step 1, an AC test as Step 2 and how to program a DC test in Step 3. Follow the green arrows
(!) on the right side of this diagram to program the individual DC hipot test parameters.
STEP 3/3

[F1] = New
Program
Step 3 = DC

VOLT

0.000kV

HIGH
TIME

:
:

0.500mA
3.0s

Voltage is 0

STEP 3/3

Select
DC
Test Mode

VOLT

0.000kV

HIGH
TIME

:
:

0.500mA
3.0s

Select Mode

STEP 3/3

Set
Test Voltage

RMT

OFF

:
:

OFF
OFF

FALL

OFF

LOCK

OFST

LOW

OFF

ARC
RAMP

:
:

OFF
OFF

FALL

OFF

LOCK

OFST

LOW

OFF

:
:

OFF
OFF

0.000kV

HIGH
TIME

:
:

0.500mA
3.0s

DWELL
FALL

:
:

OFF
OFF

I-RUS

OFF

RMT

LOCK

OFST

LOW

OFF

:
:

OFF
OFF

VOLT

2.500kV

ARC
RAMP

HIGH
TIME

:
:

0.500mA
3.0s

DWELL
FALL

:
:

OFF
OFF

I-RUS

OFF

0.0001 - 5mA

STEP 3/3

RMT

LOCK

OFST

LOW

OFF

:
:

OFF
OFF

VOLT

2.500kV

ARC
RAMP

HIGH
TIME

:
:

2.999mA
3.0s

DWELL
FALL

OFF
OFF

I-RUS

OFF

0, 0.1 - 999s

STEP 3/3

Set
Low Current
Limit

ARC
RAMP

VOLT

STEP 3/3

Set
Test Time

RMT

LOW

ARC
RAMP

0.05 - 6kV

Set
High Current
Limit

RMT

LOCK

OFST

LOW

OFF

:
:

OFF
OFF

VOLT

2.500kV

ARC
RAMP

HIGH
TEST

:
:

2.999mA
5.0s

DWELL
FALL

:
:

OFF
OFF

I-RUS

OFF

0 - 5mA 0 = OFF

RMT

LOCK

OFST

ERR

FIRST

To change value in highlighted box.

MORE..

To delete or insert a test step.

To move highlighted box around
display to select parameter to change

EXIT

To exit programming mode.

Set MODE = DC

DOWN

EXIT

INC.

DEC.

EXIT

INC.

DEC.

EXIT

INC.

DEC.

ENTER

EXIT

INC.

DEC.

EXIT

To move highlighted box to VOLT

To set test voltage:
0.05 - 6kV in .001kV increments

To move highlighted box to HIGH.

To set high current limit:
0.0001 - 5mA in .001mA increments

To move highlighted box to TIME.

To set test time:
0, 0.1 - 999s in 0.1s increments

To move highlighted box to LOW.

To set low current limit:
0 - 5mA in 0.001mA increments

To move highlighted box to ARC.

Continue on next page.

Operation

Page 39 of 85

Programming an DC Hipot Test (Continued)
STEP 3/3

Set
Arc Limit

2.500kV

:
:

2.999mA
5.0s

DWELL
FALL

:
:

OFF
OFF

I-RUS

OFF

LOCK

OFST

LOW
ARC

:
:

ERR

0.015mA
OFF

INC.

DEC.

EXIT

INC.

VOLT
HIGH

:
:

2.500kV
2.999mA

RAMP
DWELL

:
:

OFF
OFF

DEC.

TIME

5.0s

FALL
I-RUS

:
:

OFF
OFF

EXIT

INC.

DEC.

EXIT

INC.

RMT
DC

LOCK

OFST

LOW

:
:
:

OFF
3.0s

VOLT

2.500kV

HIGH
TIME

:
:

2.999mA
5.0s

DWELL
FALL

:
:

OFF
OFF

I-RUS

OFF

STEP 3/3

RMT
DC

LOCK

OFST

LOW
ARC

:
:

ERR

0.015mA

ARC
RAMP

0 - 999s 0 = OFF

ERR

0.015mA
OFF

VOLT
HIGH

:
:

2.500kV
2.999mA

RAMP
DWELL

:
:

3.0s
3.0s

DEC.

TIME

5.0s

FALL
I-RUS

:
:

OFF
OFF

EXIT

INC.

0 - 999s 0 = OFF

STEP 3/3

RMT

LOCK

OFST

LOW
ARC

:
:

ERR

0.015mA
OFF

VOLT
HIGH

:
:

2.500kV
2.999mA

RAMP
DWELL

:
:

3.0s
3.0s

DEC.

TIME

5.0s

FALL
I-RUS

:
:

3.0s
OFF

EXIT

0, 0.5uA-5mA 0 = OFF

Set
Next
Test Step

RMT
DC

STEP 3/3

Set
I-Rus Limit

OFF
OFF

HIGH
TIME

0 - 999s 0 = OFF

Set
Fall Time

:
:

VOLT

STEP 3/3

Set
Dwell Time

ARC
RAMP

1 - 5mA 0 = OFF

Set
Ramp Time

0.015mA

LOW

STEP

3/3

VOLT
HIGH

:
:

TIME

RMT

OFST

ERR

0.015mA
OFF

LOW
ARC

:
:

NEW

2.500kV
2.999mA

RAMP
DWELL

:
:

3.0s
3.0s

MORE..

5.0s

FALL
I-RUS

:
:

3.0s
OFF

EXIT

[F1] : Program Step 4
or
[F4] : Exit Program Mode

1 - 10

LOCK

RMT

LOCK

OFST

ERR

Set arc current limit:
1-5mA in 0.1mA increments

To move highlighted box to RAMP.

To set Ramp Time:
0 - 999s in 0.1s increments

To move highlighted box to DWELL.

To set Dwell Time:
0 - 999s in 0.1s increments

To move highlighted box to FALL.

To set Fall Time:
0 - 999s in 0.1s increments

To move highlighted box to I-RUS.

Set in-rush current limit:
0, 0.5uA -5mA
in 0.001mA increments

To move highlighted box to STEP.

To set next test step = 4

To exit programming mode and return
to STAND BY status.

END DC Hipot Test Programming. After selecting the I-RUSH limit, press [F1] = NEW to change the step
number in the highlighted box (1-10) and start programming STEP 4-10, OR press [F4] = EXIT to exit
programming function and return to STAND BY status.
For this example, press [F1] = NEW and proceed to program step 4 as an IR Test (¶ 2.7).
NOTE: The In-Rush current range is dependent on the programmed High Limit. Refer to Safety Features in the
Specifications section, page 8.

Page 40 of 85

Operation

NOTE: In-Rush Current
The In-Rush current limit for the DC hipot test is a low limit which is monitored during initial charging of the device
under test. When activated (other than Off), current below the programmed value is considered to be a Fail
condition. This current monitoring is generally used to check that the charging current to the device exceeds a
specified value (> programmed limit), thus ensuring that the device is properly connected to the tester.

2.7

Programming an IR (Insulation Resistance) Test

This test is applicable to the Sentry 30 Plus instrument. With the instrument in ‘stand-by’ status,
press [F1] = PROGRAM. If continuing the 5-step example from ¶2.6, you are already in
program mode and on the AC test mode page. This example shows a GC test as Step1, an AC
test as Step 2, a DC test as Step 3 and how to program an IR test in Step 4. Follow the green
arrows (!) on the right side of this diagram to program the individual IR test parameters.
STEP 4/4

[F1] = NEW
Program
Step 4 = IR

VOLT

0.000kV

HIGH
TIME

:
:

0.500mA
3.0s

Voltage is 0

STEP 4/4

Select
IR
Test Mode

VOLT

0.000kV

HIGH
TIME

:
:

0.500mA
3.0s

Select Mode

STEP 4/4

Set
Test Voltage

VOLT

0.000kV

LOW
TIME

:
:

1.0MΩ
3.0s

0.05 - 1kV

VOLT

0.750kV

LOW
TIME

:
:

1.0MΩ
3.0s

0.1MΩ - 50GΩ

STEP 4/4

Set
Test Time

RMT

STEP 4/4

Set
Low
Resistance
Limit

VOLT

0.750kV

LOW
TIME

:
:

1.5MΩ
3.0s

0, 0.1 - 999s

RMT

LOW

OFF

ARC
RAMP

:
:

OFF
OFF

FALL

OFF

LOCK

OFST

LOW

OFF

ARC
RAMP

:
:

OFF
OFF

FALL

OFF

LOCK

OFST

HIGH

OFF

RAMP
DWELL

:
:

OFF
OFF

FALL

OFF

LOCK

OFST

HIGH

OFF

RAMP
DWELL

:
:

OFF
OFF

FALL

OFF

LOCK

OFST

HIGH

OFF

RAMP
DWELL

:
:

OFF
OFF

FALL

OFF

LOCK

OFST

ERR

FIRST

To change value of highlighted box.

MORE..

To delete or insert a test step.

To move highlighted box to MODE.

EXIT

To exit programming mode.

Set MODE = IR

DOWN

EXIT

INC.

DEC.

EXIT

INC.

DEC.

EXIT

INC.

DEC.

EXIT

To move highlighted box to VOLT

To set test voltage:
0.05 - 1kV in 0.001kV increments

To move highlighted box to LOW.

To set low resistance limit:
0.1M - 50GΩ
in 0.1MΩ increments

To move highlighted box to TIME.

To set dwell time:
0, 0.1 -999s in 0.1s increments

To move highlighted box to HIGH.

Continue on next page.

Operation

Page 41 of 85

Programming an IR (Insulation Resistance) Test (Continued)
STEP 4/4

Set
High
Resistance
Limit

VOLT

0.750kV

LOW
TIME

:
:

1.5MΩ
5.0s

0 - 50GΩ 0 = OFF

STEP 4/4

Select
Ramp Time

VOLT

0.750kV

LOW
TIME

:
:

1.5MΩ
5.0s

0 - 999s 0 = OFF

STEP 4/4

Select
Dwell Time

VOLT

0.750kV

LOW
TIME

:
:

1.5MΩ
5.0s

0 - 999s 0 = OFF

STEP 4/4

Set
Fall Time

VOLT

0.750kV

LOW
TIME

:
:

1.5MΩ
5.0s

0 - 999s 0 = OFF

Set
Next
Test Step
[F1] : Program Step 5
or
[F4] : Exit Program Mode

STEP

4/4

VOLT

0.750kV

LOW
TIME

:
:

1.5MΩ
5.0s

1 - 10

RMT

HIGH

OFF

RAMP
DWELL

:
:

OFF
OFF

FALL

OFF

LOCK

OFST

HIGH

RAMP
DWELL

:
:

OFF
OFF

FALL

OFF

LOCK

1.250GΩ

OFST

HIGH

RAMP
DWELL

:
:

3.0s
OFF

FALL

OFF

LOCK

OFST

RAMP
DWELL

:
:

3.0s
3.0s

FALL

OFF

ERR

1.250GΩ

OFST

HIGH

RAMP
DWELL

:
:

3.0s
3.0s

FALL

3.0s

LOCK

ERR

1.250GΩ

HIGH

LOCK

ERR

1.250GΩ

OFST

ERR

INC.

DEC.

EXIT

DOWN

EXIT

DOWN

EXIT

INC.

DEC.

EXIT

NEW

MORE ..

EXIT

To set high resistance limit:
0 - 50GΩ in 0.1MΩ increments

(from programmed low limit to 50G Ω)

To move highlighted box to RAMP.

To set ramp time:
0 - 999s in 0.1s increments

To move highlighted box to DWELL.

To set ramp time:
0 - 999s in 0.1s increments

To move highlighted box to FALL.

To set fall time:
0 - 999s in 0.1s increments

To move highlighted box to STEP.

To set next test step = 5

To exit programming mode and return
to STAND BY status.

END IR Test Programming. After selecting the FALL Time, one can either press [F1] = NEW
to change the step number in the highlighted box (1-10) and start programming STEP 5-10, OR
one can press [F4] = EXIT to exit programming function and return to STAND BY status.
For this example, press [F1] = NEW and proceed to program step 5 as a PAUSE (¶ 2.8).

Page 42 of 85

Operation

2.8

Programming a Pause in Test Sequence

“PAUSE” is a mode selection that allows a test sequence to be stopped while test leads are
changed or other operations performed. A 15-character user programmable message will be
displayed on the screen when in PAUSE mode and the test will continue when the [START]
button is pressed or when START is initiated via remote I/O. The Under Test relay on the
remote I/O can also be cycled during PAUSE if required. During the test sequence when
PAUSE is encountered the tester stops, displays PAUSE and 15-character message until START
button is pressed again (or START is initiated via remote I/O).
This mode is applicable to the Sentry 10, 20 and 30 Plus instruments. With the instrument in
‘stand-by’ status, press [F1] = PROGRAM. If continuing the 5-step example from ¶2.7, you are
already in program mode and on the AC test mode page. This example shows a GC test as
Step1, an AC test as Step 2, a DC test as Step 3, an IR test as Step 4 and finally how to program
a Pause as Step5. Follow the green arrows (!) on the right side of this diagram to program the
individual Pause mode parameters. Enter a message (length 1-15 characters) for the operator.
STEP 5/5

[F1] = NEW
Program
Step 5 = PA

VOLT

0.000kV

HIGH
TIME

:
:

0.500mA
3.0s

Voltage is 0

RMT

STEP 5/5

Select
PA
Test Mode

VOLT

0.000kV

HIGH
TIME

:
:

0.500mA
3.0s

Select Mode

RMT

STEP 5/5

Enter
Pause
Message

PAUSE

OFF
OFF

FALL

OFF

LOCK

OFST

LOW

OFF

ARC
RAMP

:
:

OFF
OFF

FALL

OFF

LOCK

OFST

ERR

OFF

RMT

STEP 5/5

Enter
Pause
Message

OFF

:
:

1 - 15 CHAR.

ARC
RAMP

PAUSE MODE

UNDER TEST SIGNAL

PAUSE

LOW

LOCK

OFST

ERR

CHANGE-DUT

UNDER TEST SIGNAL

1 - 15 CHAR.

OFF

RMT

LOCK

OFST

ERR

FIRST

To change value of highlighted box.

MORE..

To delete or insert a test step.

To move highlighted box to MODE.

EXIT

To exit programming mode.

Set MODE = PA

DOWN

EXIT

DOWN

NEXT C.

To move cusor to next character.

CANCEL

To erase message.

DOWN

CANCEL

To move highlighted box to
PAUSE

To enter message:
1 - 15 characters: * + , - . /
0 -9 and A - Z

To move highlighted box to UNDER.

Continued on Next Page.

Operation

Page 43 of 85

Programming a PAUSE in test sequence (continued):
STEP 5/5
PAUSE

Set
Test Signal

CHANGE-DUT

UNDER TEST SIGNAL

OFF / ON

STEP

Exit
Program
Mode

PAUSE

RMT

5/5

LOCK

OFST

ERR

CHANGE-DUT

UNDER TEST SIGNAL

1 - 10

OFF

RMT

LOCK

OFST

ERR

INC.

DEC.

EXIT

INC.

DEC.

EXIT

To set test signal:
OFF or ON

To move highlighted box to STEP.

To set next test step

To exit programming mode and return
to STAND BY status.

END PA Mode Programming. For the sake of this 5-step example, after selecting the UNDER
TEST SIGNAL ON or OFF, press [F4] = EXIT to exit programming function and return to
STAND BY status.

Page 44 of 85

Operation

2.9

Storing a Test Setup

NOTE:
Instrument PRESET values can be programmed and stored for your specific test setup. Therefore
before storing your tests, program the preset values. Refer to p 2.11 for PRESET programming
information.
To store the previous example of the programmed 5-step test, with the instrument in ‘STAND
BY’ status, press [F3] = MENU to access the memory function.
In MENU with the highlighted box around MEMORY, press [F3] = SELECT to enter the
memory function.
STEP 1/5

STAND BY

1
2
3
4
5

0.3Ω

1
2
3
4
5

RMT

LOCK

OFST

ERR

MEMORY
SYSTEM
OPTION
CALIBRATION
KEY LOCK

SELECT FUNC.

MEMORY

LOW

0.1A
1.2Ω
0.5s

STAND BY
Display

RMT

LOCK

OFST

ERR

(0 STEPS)
(0 STEPS)
(0 STEPS)
(0 STEPS)
(0 STEPS)

SELECT FUNC.

RMT

LOCK

OFST

ERR

PROGRAM

PRESET

MORE..

LAST

To toggle through MENU functions.

DOWN

To toggle through MENU functions.

SELECT

To enter MEMORY function.

EXIT

Return to STAND BY display.

STORE

To store a test setup in memory
location 1-60

RECALL

Recall test in highlighted location.

DELETE

Delete test in highlighted location.

RETURN

Return to MENU display.

To enter programming mode.
To view/change preset (initial) test
parameters.
To view/change system parameters:
memory, system, option, calibration, key
lock, password, error, & about.
To view the programmed test setups and
access offset function.

Press [F1] = STORE to access the store function. Press [F2] = DOWN to move highlighted box
to the memory location (1-60) in which you wish to store this test setup. Press [F3] = SELECT
to accept location number.

Select
LOCATION

1
2
3
4
5

(0 STEPS)
(0 STEPS)
(0 STEPS)
(0 STEPS)
(0 STEPS)

SEL. MEMORY

Operation

RMT

LOCK

OFST

ERR

LAST

DOWN

SELECT

RETURN

To move highlighted box to
memory location 60
To toggle through memory
locations 1-60
To select highlighted memory
location and store previously
programmed test setup

Page 45 of 85

To label the selected location, press [F1] = UP (and/or [F2] = DOWN) to enter a combination
alpha-numeric name for this test setup. Press [F3] = NEXT C. after each digit to accept that digit
and move on to the next. The name can be up to 10 characters long. When finished entering the
name, press [F3] = ENTER two times.

LABEL
Test Setup

1
2
3
4
5

(0 STEPS) _
(0 STEPS)
(0 STEPS)
(0 STEPS)
(0 STEPS)

SELECT FUNC.

Exit
Label
Function

1
2
3
4
5

RMT

LOCK

OFST

ERR

(0 STEPS) 123
(0 STEPS)
(0 STEPS)
(0 STEPS)
(0 STEPS)

SEL. MEMORY

RMT

LOCK

OFST

ERR

To enter an alpha-numeric character

DOWN

To enter an alpha-numeric character

NEXT C.

Accept entered character and move
on to next character

CANCEL

DOWN

NEXT C.

CANCEL

Press 2 Times to exit LABEL
function

The display will prompt: STORE TO #? Press [F1] = YES to accept storage to that memory
location # or [F2] = NO to reject storage. Press [F4] = RETURN once to return to “MENU”
display. Press [F4] a second time to return to “STAND BY” display.

Confirm
STORE

1
2
3
4
5

(0 STEPS) 123
(0 STEPS)
(0 STEPS)
STORE TO 1?
(0 STEPS)
(0 STEPS)

MEMORY

M01

STAND BY
Display with
Memory ID

LOCK

OFST

1/5

RMT
GC

LOCK

OFST
LOW

ERR
0.3Ω

0.1A
1.2Ω
0.5s
STAND BY

Store test setup to location #1

RMT

LOCK

OFST

ERR

(5 STEPS) 123
(0 STEPS)
(0 STEPS)
(0 STEPS)
(0 STEPS)

SELECT FUNC.

RMT
1
2
3
4
5

YES

ERR

STORE

RECALL

DELETE

RETURN

PROGRAM

PRESET

MORE..

Return to MENU display.

The MEMORY RECALL and DELETE functions work the same way as STORE. When the
instrument returns to STAND BY status there will be a tag “Mxx” in the upper left hand corner
of the display to indicate which memory location is in use (displayed).

Page 46 of 85

Operation

2.10

Programming a Multi-Step Test

Paragraphs 2.4, 2.5, 2.6, 2.7 and 2.8 illustrate the programming of a 5-step test (GC, AC, DC, IR
& PA). To program a multiple step test, power-up the Sentry Plus Series instrument so the
‘Stand By’ display is shown (Figure 2-2).
Press [F1] = PROGRAM and enter the test
parameters for the first test (GC). After specifying LOW resistance limit, press [F3] = NEXT and
[F1] = NEW to enter test parameters for the second test (AC). At this time, do NOT press [F4] =
EXIT because this will exit you from programming mode. After specifying FALL time for the
second test press [F3] = NEXT to continue entering test parameters for the third test (DC).
Continue this process for up to 10 steps. When finished entering desired number of test steps,
press [F4] = EXIT to exit programming mode and return to Stand By status.
In Stand By status, to view the test steps just programmed press [F4] = MORE. Figure 2-4
illustrates the Stand By display and resultant test steps display if the programming example in
paragraphs 2.4-2.8 was followed.
M01

1/5

LOW

0.3Ω

0.1A
1.2Ω
0.5s

STAND BY
with
Memory ID

STAND BY

RMT

LOCK

OFST

ERR

PROGRAM

PRESET

MORE..

Continuing with the 5-step example, press [F4] = MORE to view
the 5 test steps (GC, AC, DC, IR & PA) stored to location 1.
M01

Test
Steps

1
2
3
4
5

GC
AC
DC
IR
PA

OUTPUT

MEASURE

RESULT

0.1A
2.750kV
2.500kV
0.750kV
OFF

1.2Ω
15.00mA
2.999mA
1.5MΩ

--------------------------------------------------------

STAND BY

RMT

LOCK

OFST

F1
F2

ERR

OFFSET

EXIT

Figure 2-4: View Programmed Test Setups

Operation

Page 47 of 85

2.11

PRESET Test Parameters

A number of initial parameters or default conditions may be programmed and stored as the
‘power-up’ conditions. On the Sentry Plus Series instruments, this function is labeled PRESET
and is accessible on the STAND BY display.
The PRESET values are stored with each programmed test. Therefore each memory location
may have different PRESET values. It is important to set the PRESET values prior to storing a
test program.
Table 2-3 lists the Sentry Plus Series PRESET test parameters including parameter range and
initial (default) value.
Table 2-3: PRESET Test Parameters
Parameter

Range

AC-V FREQ.
SOFT. AGC

50 or 60Hz
ON or OFF

Initial
(Default)
Value
60Hz
ON

WV AUTO RANGE
IR AUTO RANGE
GFI
FAIL RESTART

ON or OFF
ON or OFF
ON or OFF
ON or OFF

OFF
ON
ON
OFF

Description

Set frequency for AC Hipot test
Set software automatic gain control function
ON or OFF
Set hipot auto range function ON or OFF
Set resistance auto range function ON or OFF
Set ground fault interrupt to trip at 0.5mA
Fail continue steps

2.11.1 AC-V FREQ.
The AC-V Frequency setting allows the user to select the line frequency for the AC hipot test.
The range of AC-V Freq. is 50 or 60Hz and the instrument default setting is 60Hz.
2.11.2 SOFTWARE AGC
The Software Automatic Gain Control (SOFT AGC) setting allows the option of correcting the
output voltage when ON. This is satisfactory when measuring resistors but under special
circumstances when measuring large capacitive devices it is best to select Software AGC OFF.
The default value is ON.
2.11.3 WV AUTO RANGE
The WV Auto Range setting allows the option of using the full scale current range (ON) or using
the user programmed maximum current limit (OFF) during a withstand voltage (hipot) test. The
low current range (3mA full scale) results in increased measurement resolution. The default
value of WV Auto Range is OFF.

Page 48 of 85

Operation

2.11.4 IR AUTO RANGE
The IR Auto Range setting allows the option of using the full scale current range (ON) or using
the user programmed maximum current limit (OFF). To increase measurement resolution in IR
mode, select IR Auto Range ON. To increase measurement speed in IR mode, select IR Auto
Range OFF. The instrument default value for IR Auto Range is ON.
2.11.5 GFI
The Ground Fault Interrupt (GFI) function can be programmed ON or OFF and the instrument
default setting is ON. When GFI is activated, the ground fault interrupt circuit detects leakage
current to ground. If the leakage is >0.5mA, the high voltage will be shut down in less than
0.5ms.
NOTE:
When using the Sentry Plus instrument with the Sentry 50 Ground Bond Tester,
GFI must be turned OFF.

2.11.6 FAIL RESTART
The FAIL RESTART function can be programmed ON or OFF and the instrument default setting
is OFF. When the Fail Restart function is turned ON, the Sentry Plus instrument does not
require the STOP button to be pressed to restart the test. This mode is typically used in
conjunction with the remote I/O connections to automatically restart the test when a failure
occurs. This can be done by connecting one Fail contact (pin 8) to the Start contact (pin 5) and
the other Fail contact (pin 9) to the COM contact (pin 3).

Operation

Page 49 of 85

2.12

Instrument Offset

The Sentry Plus Series instrument provides automatic offset for lead and/or fixture effects.
During the offset process a correction is made (subtracted out) as the result of the measured
current with no DUT attached. For maximum measurement accuracy it is recommended that the
OFFSET function be performed on the Sentry Plus Series instrument after power up, any time
the test parameters are changed and any time the test leads or fixture is changed. Return and HV
test leads should not be connected together (open circuit) for AC and DC hipot tests. Return and
GC test leads should be connected (short circuit) for a GC test. There is no offset in an IR test.
Once the Offset function is turned ON for a specific program, it can be stored in memory with
that program. If the program parameters are changed the offset function will automatically turn
OFF and the offset function will be need to be performed again to get the new offset value. It
will then need to be restored in memory.
Prior to performing the OFFSET function:
•
Allow the instrument to warm up for 15 minutes.
•
Connect the Test cables (or fixture) to the OUTPUT and RTN/LOW connectors.
•
Program the test steps.
With the instrument in STAND BY status:
•
Press [F4] = MORE
•
Press [F3] = OFFSET
•
Follow instructions on display: i.e.: connect OPEN across OUTPUT terminal.
•
Press green [START] button.
•
Wait while instrument gets OFFSET value.
•
The OFST block at the bottom of the display is now highlighted (back lit).
•
Press [F4] = MORE to return to STAND BY status.
•

To undo the OFFSET function:
•
Press [F3] = OFFSET
•
Follow prompt on display: “Turn off the offset function?”
•
Press [F3] = ENTER to turn off OFFSET function.
•
The OFST block at the bottom of the display is not highlighted now.
The following formulas apply to the offset function:
For Offset Current

100mA:

Display Current =

2
Measured Total Current -

Offset Total Current

Measured Total Current -

Offset Total Current

For Offset Current > 100mA:
Display Current =

Page 50 of 85

Operation

OFFSET Function
There is no offset in the IR or PA modes. Using the pre-programmed example from paragraphs
2.4-2.8 of the GC, AC, DC, IR & PA 5-step test the resultant error and correction is illustrated
herein.
M01

STEP 1/5

STAND BY

M01

RMT

OUTPUT

MEASURE

1
2

GC
AC

0.1A
2.750kV

1.2Ω
15.00mA

3
4

DC
IR

2.500kV
0.750kV

2.999mA
1.5MΩ

CHANGE-DUT

STAND BY

GET
OFFSET

0.3Ω

0.1A
1.2Ω
0.5s

"STAND BY"
Display
with
Memory ID

[F4]

LOW

RMT

LOCK

OFST

ERR

PROGRAM

PRESET

MORE..

RESULT

------------------------------------------------------------LOCK

OFST

ERR

OFFSET

To enter OFFSET function.

MORE..

To return to STAND BY status

PLEASE OPEN THE HV
OUTPUT TERMINAL.
NO OFFSET IN IR MODE.

M01

OFFSET
VALUES

LOCK

OUTPUT

MEASURE

1
2

GC
AC

0.1A
2.753kV

0.1Ω
0.07mA

PASS
PASS

3
4

DC
IR

2.499kV
0.750kV

0.002mA
1.5MΩ

PASS
SKIPPED

CHANGE-DUT

U.T.S = OFF

M01

5/5

RMT

OFST

ERR

CANCEL

RESULT

LOCK

UNDER TEST SIGNAL: OFF

F1
F2
F3

OFST

ERR

MORE..

U.T.S = OFF

5/5

RMT

START

LOCK

OFST

ERR

MORE..

PASS

PAUSE: CHANGE-DUT

UNDER TEST SIGNAL: OFF

PASS

PRESS TEST KEY TO CONTINUE..

M01

PAUSE: CHANGE-DUT

To GET OFFSET values

START

PRESS TEST KEY TO GET OFFSET..
RMT

To access OFFSET function.

RMT

LOCK

OFST

ERR

F2
F3

MORE..

After PASS Screen, press [STOP] and screen reverts to STAND BY display.
Continue on Next Page.

Operation

Page 51 of 85

Offset (continued)
To turn to Offset function OFF, and return to STAND BY status, follow the screens herein.
1/5

M01

STAND BY

M01

RMT

OUTPUT

MEASURE

GC
AC

0.1A
2.750kV

1.2Ω
15.00mA

---------------

3
4

DC
IR

2.500kV
0.750kV

2.999mA
1.5MΩ

---------------

CHANGE-DUT

M01

RMT

5/5

1.
2.

NO OFFSET IN IR MODE.

LOCK

MEASURE

0.1A
2.753kV

0.1Ω
0.07mA

-------------

3
4

DC
IR

2.499kV
0.750kV

0.002mA
1.5MΩ

-------------

CHANGE-DUT

MORE..

5-Steps Programmed
Offset ON
Ready to Test

F1
F2

OFST

ERR

OFST

ERR

OFFSET

MORE..

OFF

Turn select
Offset function

Turn Offset OFF

LOCK

LOW

RMT

LOCK

Go to Results page

F1
F2

-------

RMT

CANCEL

RESULT

OFST

ERR

0.3Ω

0.1A
1.2Ω
0.5s
STAND BY

PRESET

OUTPUT

STEP 1/5

GC
AC

M01

ERR

PROGRAM

RESULT

1
2

PASS

OFST

PLEASE OPEN THE H.V.
OUTPUT TERMINAL.

M01

[F4]

0.3Ω

--------

RMT

[F4]

LOCK

1
2

PASS

[F3]

0.1A
1.2Ω
0.5s

[F4]

LOW

OFST

ERR

OFFSET

MORE..

PROGRAM

PRESET

MORE..

Go to STAND BY page

5-Steps Programmed
Offset OFF
Ready to Test

End Offset Function.

Page 52 of 85

Operation

2.13

Connection to Device under Test

Figure 2-5 illustrates the connection of the Sentry Plus Series unit to a single DUT using the S02
1-meter HV cable set that comes standard with the instrument. The custom white banana
plug/red alligator clip is connected between the OUTPUT terminal on the Sentry Plus Series unit
and the high side of the device under test. The black banana plug/alligator clip is connected
between the RTN/LOW terminal on the Sentry Plus Series unit to the low side of the DUT.
STOP

QuadTech
M1

START

LOW: OFF
ARC: OFF

1.250kV
0.500mA
3.0s
STAND BY

CAL

Sentry 30 Plus AC/DC/IR Hipot Tester

STEP 1/5

RAMP: OFF
FALL: OFF

RMT

UPDATE

LOCK

PASS

FAIL

OFST

ERR

PROGRAM

PRESET

MORE..

OUTPUT

DANGER

RTN/LOW

CAUTION
Max 5kVAC
6kVDC

S02
Cable
Set

+
DUT

Figure 2-5: S02 Cable Connection
Refer to paragraphs 3.2 through 3.7 for the description and illustration of the connection of
several QuadTech accessories to the Sentry Plus Series instrument.

Operation

Page 53 of 85

2.14

Measurement Procedure

Before a measurement is made verify the following:
1.
2.
3.
4.
5.
6.

Sentry Plus Series instrument [POWER] ON.
15-minute warm-up.
Test parameters programmed and shown on STAND BY display.
Test cables or fixture connected.
Offset Function initiated.
Device under test connected.

The operator has the option of performing a test at power-up conditions (test conditions at which
the instrument was last powered down) or recalling one of 60 stored test setups. Refer to
paragraphs 2.4 – 2.9 for test programming and storage/recall instructions.
To initiate a test:
•
•
•
•
•
•

Press [STOP] to make sure instrument is in STAND BY status.
Press [START]. DANGER led flashes. Status window shows UNDER TEST.
The test voltage is shut off when all test steps are completed,
OR when a test result is judged a FAIL per programmed test limits,
OR when the [STOP] button is pressed.
Press [STOP] at any time to terminate the output voltage and stop the test.

The Sentry Plus Series instrument judges the measurement value as GOOD or NO GOOD. A
GOOD judgment means the DUT passed all programmed steps. Upon completion of the test the
output voltage is terminated and the display shows PASS. The rear panel PASS signal is
functional and the buzzer sounds (if not turned OFF in SYSTEM parameters under MENU).
If a multiple step test is running and one step in the sequence fails, the Sentry Plus instrument
will not continue with the remaining steps
If the measurement value of the test (or any one step of the test) does not meet programmed
limits, the DUT is judged as NO GOOD, the display will show FAIL and the buzzer will sound
until the [STOP] button is pressed. The [STOP] button may be pressed at any time to terminate
the output voltage and stop the test.

Page 54 of 85

Operation

Error Messages (FAIL result)
When the measurement value was judged NO GOOD and FAIL is shown on the display, an error
message denoting the test result will be shown on the display also. Table 2-4 lists the possible
error messages for a NO GOOD/FAIL judgment.
Table 2-4: Error Messages
Error Message
HIGH FAIL
LOW FAIL
ARC FAIL
I/O FAIL
VOLTAGE OVER
CURRENT OVER
GFI TRIPPED
NO OUTPUT
INRUSH FAIL
MEMORY FULL

Operation

Description
Measured value (current or resistance) is over the programmed high limit.
Measured value (current or resistance) is below the programmed low limit.
Current arc is over the programmed high limit.
Hardware Current Limit exceeded. Check DUT for short.
Voltage reading is greater than the hardware allowable # of digits.
Current reading is greater than the hardware allowable # of digits.
Ground Fault Interrupt is No Good.
Output is too Low. (Try increasing test time)
Charging Current is over limit. (Check test fixture)
Greater than 60 tests/slot have been stored.

Page 55 of 85

2.15

MENU Parameters

With the Sentry Plus Series instrument in STAND BY status, press [F3] = MENU to access
programmable instrument parameters. The MENU display contains the Memory, System,
Option, Calibration, Key Lock, Change Password, Error Log and About functions. Table 2-5
lists these functions with description and default values.
Table 2-5: MENU Parameters
MENU #
1

Parameter
MEMORY

SYSTEM

3
4

OPTION
CALIBRATION

5
6
7
8

KEY LOCK
CHANGE PASSWORD
ERROR LOG
ABOUT

M01

STEP 1/5

STAND BY

1
2
3
4
5

RMT

OFF

6
7
8
1
2

LOCK

OFST

ERR

MEMORY
SYSTEM
OPTION
CALIBRATION
KEY LOCK
STAND BY

LOW

0.1A
1.2Ω
0.5s

STAND BY

Function
Store, Recall or Delete a test setup from
instrument memory
Change display contrast
Change beeper volume
Enable EN 50191 Current limit
Enable DC 50V AGC
Multi-Link function, currently unavailable
Enter instrument calibration routine
Qualified service personnel only.
Lock out front panel program access.
Change key lock (user) password.
View status of error queue.
Instrument Information
Manufacturer, software version, etc

RMT

LOCK

OFST

ERR

CHANGE PASSWORD
ERROR LOG
ABOUT
MEMORY
SYSTEM
STAND BY

RMT

LOCK

OFST

ERR

PROGRAM

PRESET

MORE..

LAST

DOWN

SELECT

EXIT

LAST

DOWN

SELECT

EXIT

Press F3 = "MENU"
To set/change preset parameters

Press F2 = "DOWN" 5 times to
view complete menu choices

Figure 2-6: Menu Display

Page 56 of 85

Operation

2.15.1 MEMORY
Within the MEMORY function is the ability to STORE, RECALL or DELETE test setups, preset
parameters and offset values. There are 60 memory locations available and a single location may
contain 1-10 steps. The total memory array is 60 and the instrument uses up to 10 locations to
run the test(s). If a 3-step test is programmed then the instrument uses 3 additional steps to run
the test. Therefore five 10-step sequences, fifty-nine 1-step sequences or a combination therein
could be programmed. If more than 50 locations are stored, then the Sentry Plus will prompt
“memory full” when the store function is accessed again.

1
2
3
4
5

MEMORY
SYSTEM
OPTION
CALIBRATION
KEY LOCK

SELECT FUNC.

MEMORY

1
2
3
4
5

Select
LOCATION

LABEL

Confirm
STORE

RMT

MEMORY

LOCK

OFST

ERR

LOCK

OFST

ERR

LOCK

OFST

ERR

(0 STEPS)
(0 STEPS)
(0 STEPS)
STORE TO 1?
(0 STEPS)
(0 STEPS)
LOCK

OFST

To move to #8, About.

DOWN

To toggle through MENU functions.

SELECT

To enter MEMORY function.

EXIT

Return to STAND BY display.

STORE

To store a test setup in memory
location 1-60

RECALL

Recall test in highlighted location.

DELETE

Delete test in highlighted location.

RETURN

Return to MENU display.

LAST

To move highlighted box to
memory location 60

DOWN

SELECT

RETURN

DOWN

NEXT C.

CANCEL

YES

To toggle through memory
locations 1-60
To select highlighted memory
location and store previously
programmed test setup

Press 2 Times to exit LABEL
function

Store test setup to location #1

RMT

LOCK

OFST

ERR

(5 STEPS) 123
(0 STEPS)
(0 STEPS)
(0 STEPS)
(0 STEPS)

SELECT FUNC.

RMT
1
2
3
4
5

ERR

(0 STEPS) 123
(0 STEPS)
(0 STEPS)
(0 STEPS)
(0 STEPS)

SEL. MEMORY
1
2
3
4
5

OFST

(0 STEPS)
(0 STEPS)
(0 STEPS)
(0 STEPS)
(0 STEPS)

SEL. MEMORY
1
2
3
4
5

LOCK

(0 STEPS)
(0 STEPS)
(0 STEPS)
(0 STEPS)
(0 STEPS)

SELECT FUNC.
1
2
3
4
5

RMT

LAST

ERR

STORE

RECALL

DELETE

RETURN

Return to MENU display.

Figure 2-7: Memory Function
Operation

Page 57 of 85

To Recall a Test Setup:
With the Sentry Plus instrument in Stand By status:
Press [F3] = MENU.
Press [F3] = SELECT to select MEMORY from the menu parameters list.
Press [F2] = RECALL to select the recall function.
Press [F1] = LAST or [F2] = DOWN to toggle through the test steps.
When the highlighted box is around the test step you want (3. 3 steps),
Press [F3] = SELECT.
The Sentry Plus instrument will prompt: “Recall From 3?”
Press [F1] = YES to recall the test setup or [F2] = NO to select another test setup.
Press [F4] = RETURN to go back to the MENU display.
Press [F4] = EXIT to return the instrument to STAND BY status.
When the Sentry Plus has Key Lock turned ON, the user has the option to lock out recall or
allow for programs to be recalled. If Recall is allowed when Key Lock is ON, then the Recall
function is accessible from the Stand By Menu. This lets the operator recall a memory location
without having to navigate through the menu system.
M01

STAND BY

1/5

LOW

0.3Ω

0.1A
1.2Ω
0.5s
STAND BY

RMT

LOCK

OFST

ERR

KEY LOCK

To change Key Lock Status to OFF

RECALL

To recall test setup from Memory

MORE..

To Recall with Key Lock ON in STAND BY status:
Press [F2] = RECALL
Press [F1] = LAST or [F2] = DOWN to toggle through test setups.
When the desired test setup is highlighted (backlit):
Press [F3] = SELECT and you will automatically return to STAND BY status.

To DELETE a Test Setup:
With the Sentry Plus instrument in Stand By status:
Press [F3] = MENU.
Press [F3] = SELECT to select MEMORY from the menu parameters list.
Press [F3] = DELETE to select the delete function.
Press [F1] = LAST or [F2] = DOWN to toggle through the test steps.
When the highlighted box is around the test step you want (3. 3 steps),
Press [F3] = SELECT.
The Sentry Plus instrument will prompt: “Delete From 3?”
Press [F1] = YES to delete the test setup or [F2] = NO to select another test setup.
Press [F4] = RETURN to go back to the MENU display.
Press [F4] = EXIT to return the instrument to STAND BY status.

Page 58 of 85

Operation

2.15.2 SYSTEM
Within the SYSTEM function are four programmable parameters: Contrast, Beeper Volume,
EN50191 and DC 50V AGC. With the instrument in Stand By status, access these system
parameters by pressing [F3] = MENU. Press [F2] = DOWN to move the highlighted box to
SYSTEM.
M01

STEP 1/5

STAND BY

1
2
3
4
5

1
2
3
4

CONTRAST
BUZZER VOLUME
EN 50191
DC 50V AGC
1 - 15

2.15.2.1

0.3Ω

RMT

LOCK

OFST

ERR

MEMORY
SYSTEM
OPTION
CALIBRATION
KEY LOCK
SELECT FUNC.

SYSTEM

LOW

0.1A
1.2Ω
0.5s

STAND BY

RMT

:
:
:
:

LOCK

OFST

ERR

15
OFF
OFF
ON

RMT

LOCK

OFST

ERR

PROGRAM

PRESET

MORE..

LAST

DOWN

Press F2 = "DOWN" to move
highlighted box to SYSTEM

SELECT

Press F3 = "SELECT" to enter
SYSTEM parameters

EXIT

INC.

Press F1 = "INC." to increase
brightness of display

DEC.

Press F2 = "DEC." to decrease
brightness of display

Press F3 = "NEXT" to move
highlighted box to Buzzer Volume

RETURN

Press F4 = "RETURN" to go back
to MENU display

Press F3 = "MENU"
To change instrument parameters

CONTRAST

The CONTRAST parameter adjusts the brightness of the LCD display. The range is 1-15 with
15 being the brightest and 1 being the darkest. The initial default setting is 7.
2.15.2.2

BEEPER VOLUME

The BEEPER VOLUME can be adjusted from L (low) to M (medium) to H (high, loud) or it can
be turned OFF. The initial default setting is H (a loud pitch).
2.15.2.3

EN50191

The EN50191 function sets the maximum leakage current at 3mA AC or 5mA DC in accordance
with the European standard. When EN50191 is ON, the Sentry Plus Series instrument will
terminate the voltage at the output terminals when the leakage current exceeds 3mA AC or 5mA
DC. The EN 50191 function can be set ON or OFF and the initial setting is OFF.

Operation

Page 59 of 85

EN50191 (The Erection and Operation of Electrical Test Installations) specifies safety guidelines
for both the test equipment and stations used in production lines, laboratories, test houses and
other test environments. The 3mA AC/5mA DC leakage current limit is just one electrical safety
measure in attempting to specify ‘full protection from live parts’ for the operator and the DUT.
2.15.2.4

DC 50V AGC

The Automatic Gain Control (AGC) circuit is used to keep the output signal of a circuit constant
as the amplitude of the input signal varies. So when the DC 50V AGC function is ON, the output
voltage is held constant at 50V for a DC hipot test. The DC 50V AGC function can be set ON or
OFF and the initial default setting is ON. This applies to a programmed voltage of 50V only.
NOTE:
Only in highly specialized applications should the DC 50V AGC function be set to OFF. The default value is ON
because in normal test modes, it is necessary to keep the output signal constant as the amplitude of the input signal
varies to obtain stable results.

2.15.3 OPTION
Within the OPTION function is the multi-link parameter. The multi-link function is not available
in the current software version. This option may be available in future software updates.

2.15.4 CALIBRATION
The CALIBRATION function requires a password to enter the instrument routine. Only
qualified service personnel with NIST traceable standards should perform instrument calibration.
Refer to paragraph 4.3 for the full Sentry Plus Series calibration procedure.

Page 60 of 85

Operation

2.15.5 KEY LOCK
To lock out the PROGRAM, PRESET and MENU functions of the Sentry Plus Series instrument
use the KEY LOCK function in the MENU parameters. The initial instrument setting is OFF. To
activate the KEY LOCK function with the instrument in STAND BY status:
•
•
•

Press [F3] = MENU
Press [F2] = DOWN until KEY LOCK is backlit.
Press [F3] = SELECT
M01

STEP 1/5

STAND BY

1
2
3
4
5

RMT

0.3Ω

LOCK

OFST

ERR

PROGRAM

PRESET

MORE..

MEMORY
SYSTEM
OPTION
CALIBRATION
KEY LOCK
SELECT FUNC.

•
•
•

0.1A
1.2Ω
0.5s

STAND BY

LOW

RMT

LOCK

OFST

ERR

DOWN

Press F2 = "DOWN" to move
highlighted box to KEY LOCK

SELECT

Press F3 = "SELECT" to enter
KEY LOCK function

EXIT

Display prompts ‘USER PASSWORD’
Press [A] [A] [A] [A] [ENTER]
NOTE: AAAA is the default password. If password has been changed use the new
password.
KEY LOCK
USER PASSWORD

xxxx

Press F1 = "A" to input password
character

Press F2 = "B" to input password
character

ENTER

Press F3 = "ENTER" to enter
whole password

RETURN

Press F4 = "RETURN" to go back
to MENU display

KEYLOCK

1 - 10 CHAR.

Operation

Press F3 = "MENU"
To change instrument parameters

RMT

LOCK

OFST

ERR

Page 61 of 85

KEY LOCK (continued)
•
•
•
•
•

Display prompts ‘RECALL LOCK?’
NOTE: This means: “Do you want to lock out the ability to recall memory locations?”
Press [F1] = YES to select KEY LOCK ON.
NOTE: Selecting YES disallows the recalling of programmed tests from memory.
The LOCK block at bottom of display is backlit.
KEY LOCK ON!

YES

Press F1 = "YES" to turn ON key
lock function

RECALL LOCK?

Press F2 = "NO" to turn OFF key
lock function

KEYLOCK
F3

YES / NO

1
2
3
4
5

RMT

OFST

ERR

MEMORY
SYSTEM
OPTION
CALIBRATION
KEYLOCK
SELECT FUNC.

•

LOCK

RMT

LOCK

OFST

ERR

CANCEL

DOWN

SELECT

EXIT

Press F4 = "CANCEL" to go back
to MENU display

Press F4 = "EXIT" to go back to
STAND BY display

Press [F4] = EXIT to return to STAND BY status.
M01

STAND BY

1/5

LOW

0.3Ω

0.1A
1.2Ω
0.5s
STAND BY

RMT

LOCK

OFST

ERR

KEY LOCK

To change Key Lock Status to OFF

RECALL

To recall test setup from Memory

MORE..

To disable the KEY LOCK function, repeat above steps (note: there is no confirmation page
“Recall Lock?”).

Page 62 of 85

Operation

2.15.6 CHANGE PASSWORD
The Sentry Plus Series instruments have a password function for locking out the front panel so
that the instrument PRESET settings and PROGRAM function are disabled. The CHANGE
PASSWORD function applies to the initial instrument password. The password is comprised of
“A” or “B” characters and can be 1-10 characters in length. To activate the CHANGE
PASSWORD function with the instrument in STAND BY status:
•
•
•

Press [F3] = MENU
Press [F2] = DOWN until CHANGE PASSWORD is backlit.
Press [F3] = SELECT
M01

STEP 1/5

STAND BY

1
2
3
4
5

6
7
8
1
2

RMT

LOCK

OFST

ERR

RMT

LOCK

OFST

ERR

PASSWORD
ERROR LOG
ABOUT
MEMORY
SYSTEM
SELECT FUNC.

•
•

0.3Ω

MEMORY
SYSTEM
OPTION
CALIBRATION
KEYLOCK
SELECT FUNC.

LOW

0.1A
1.2Ω
0.5s

STAND BY

RMT

LOCK

OFST

ERR

PROGRAM

PRESET

MORE..

DOWN

SELECT

EXIT

DOWN

SELECT

EXIT

Press F1 = "A" to input password
character

Press F2 = "B" to input password
character

ENTER

Press F3 = "ENTER" to enter
whole password

RETURN

Press F4 = "RETURN" to go back
to MENU display

Press F2 = "DOWN" to move
highlighted box to PASSWORD

Press F3 = "SELECT" to enter
PASSWORD function

Display prompts ‘ USER PASSWORD’
Press [A] [A] [A] [A] [ENTER]
CHANGE PASSWORD
USER PASSWORD

xxxx

PASSWORD

1 - 10 CHAR.

Operation

Press F3 = "MENU"
To change instrument parameters

RMT

LOCK

OFST

ERR

Page 63 of 85

•
•
•
•
•

Display prompts ‘NEW PASSWORD’
Press [B] [B] [B] [B] [ENTER]
Display prompts ‘CONFIRM’
Press [B] [B] [B] [B] [ENTER]
Display prompts ‘CHANGE PASSWORD OK’.
CHANGE PASSWORD
NEW PASSWORD

xxxx

Press F1 = "A" to input password
character

Press F2 = "B" to input password
character

ENTER

Press F3 = "ENTER" to enter
whole password

PASSWORD

1 - 10 CHAR.

RMT

LOCK

OFST

CHANGE PASSWORD
CONFIRM

ERR

xxxx

Press F1 = "A" to input password
character

Press F2 = "B" to input password
character

ENTER

Press F3 = "ENTER" to enter
whole password

PASSWORD

1 - 10 CHAR.

RMT

LOCK

OFST

ERR

CHANGE PASSWORD OK!

PASSWORD
F3

RMT

•
•

LOCK

OFST

ERR

RETURN

Press F4 = "RETURN" to go back
to MENU display

Press [F4] = RETURN to exit password function and return to MENU display.
Press [F4] = EXIT to go to STAND BY display.

Page 64 of 85

Operation

2.15.7 ERROR LOG
The Sentry Plus Series instruments have an Error Log to track invalid remote commands. The
remote interface is not available at this time.

2.15.8 ABOUT
The Sentry Plus Series instruments have a parameter labeled ‘About’. This parameter lists the
instrument manufacturer, software version and date. To view the contents of ABOUT with the
instrument in STAND BY status:
•
•
•
•

Press [F3] = MENU
Press [F2] = DOWN until ABOUT is backlit.
Press [F3] = SELECT
Display lists the contents of ABOUT.

ABOUT
Display

Sentry 30 Plus VERSION X.XX
COPYRIGHT (c) 2001 - 2002
QuadTech Inc.
http://www.quadtech.com
ABOUT

RMT

F2
F3

LOCK

OFST

ERR

RETURN

Return to MENU

Figure 2-8: ABOUT Display

Operation

Page 65 of 85

Section 3: Interface
3.1

Remote

A 9-pin D-Series remote control connector is located on the rear panel of the Sentry Plus Series
instrument. There is a black 5 screw terminal strip for the remote input signals: START,
RESET, COM and INTERLOCK. Inputs require a contact closure. Figure 3-1 illustrates the
Remote terminal strip connector and 9-pin D-Series connector.
Before connecting the instrument to its power source, the interlock function on the rear panel
remote connector (terminal strip) must be properly utilized. This is an important safety feature
for the protection of the operator. When the INTERLOCK jumper is removed, there is no high
voltage at the OUTPUT. Therefore, to initiate a test make sure the interlock jumper is in place.
UNDER
TEST

RESET
START

9
PASS

START

FAIL

9-pin D-Series Remote Connector

RESET
COM
INTER
LOCK

5-screw Remote Terminal Strip

Figure 3-1: Sentry Plus Series Remote Connectors
The Sentry Plus Series instrument has three output signals on the rear panel. The UNDER TEST
relay is closed during a test. The PASS relay is closed when the DUT is judged GOOD. The
FAIL relay is closed when the DUT is judged NO GOOD. These relays are rated for voltage up
to 115VAC and current <100mA.

Interface

Page 67 of 85

Figures 3-2 and 3-3 illustrate possible remote control connections to the Sentry Plus Series
terminal strip. Use extreme care when using a remote control connection as the High Voltage
Output is being turned ON and OFF with an external signal.
START
RESET
COM
INTER
LOCK

Figure 3-2: Single Control of START or RESET
START
RESET
COM
INTER
LOCK

Figure 3-3: Continuous Control of RESET
START

START
Ic'

RESET
Ic

COM
Photocoupler ON

INTER
LOCK
COM
RESET

20ms

Figure 3-4: Logic Components as Control Circuit
Figure 3-4 illustrates the usage of logic components (transistor, FET or couplers) as a control
circuit. To use this system to control the circuit, the low signal current must be ≤ 2mA and the
input signal’s active time must be > 20ms. The relay switch in Figure 3-2 or the coupler control
in Figure 3-4 uses the component’s contact for the control action, not both. This can effectively
prevent operation interference however be observant of interference induced by measurement
settings.
START and RESET terminals have unregulated 24VDC present. To initiate a test connect the
START and COM terminals. The input time duration is approximately 20milliseconds. The
above input circuits are not isolated from other internal circuits. To terminate a test connect the
RESET and COM terminals.

Page 68 of 85

Interface

Figure 3-5 illustrates the timing diagram for the Sentry Plus Series instruments under a PASS
condition and a FAIL condition.
PASS CONDITION

FAIL CONDITION

START
OPEN

UNDER
TEST
OPEN

180ms

PASS
OPEN

0.5ms

FAIL
OPEN

0.5ms

RESET
OPEN

COM

INTERLOCK

OPEN

Figure 3-5: Sentry Plus Series Timing Diagram

Interface

Page 69 of 85

3.2

G16 International Power Strip

The Sentry Plus Series instruments can be connected to the G16 International Power Strip as
illustrated in Figure 3-6 for safety testing of many European corded products.
*Australia
*North America
*Sweden
*Austria
1.
2.
3.
4.

*United Kingdom
*Norway
*Germany
*Switzerland

*Denmark
*Finland
*Netherlands
*Italy

Connect the three G-16 ground connectors to the Sentry Plus RTN/LOW terminal.
Note: there is a second RTN/LOW terminal on the rear of the Sentry instrument.
Connect the white banana plug to the Sentry Plus OUTPUT terminal.
Plug DUT’s AC power cord into corresponding module on G16 power strip.
Sentry 30 Plus Hipot Tester
STOP

QuadTech

Sentry 30 Plus AC/DC/IR Hipot Tester
F1

F2
START

F3
F3
F4

CAL

UPDATE

PASS

FAIL

OUTPUT

DANGER

RTN/LOW

CAUTION
Max 5kVAC
6kVDC

Green/
Yellow
Lug
to
RTN
or RTN
on Rear
Panel

White
Custom
Banana
Plug
to
HV
OUTPUT

Black
Banana
Plug
to
RTN
Green
Lug
to
RTN

G16 International Power Strip
NORWAY FINLAND
SWEDEN

QuadTech

SWITZERLAND

AUSTRALIA

UNITED KINGDOM

DENMARK

NORTH AMERICA

GERMANY
AUSTRIA NETHERLANDS

Figure 3-6: G16 International Power Strip Connection to Sentry 30 Plus

Page 70 of 85

Interface

ITALY

3.3

S07 Power Entry Adapter Cable

The S07 Power Entry Adapter Cable is a 3-wire AC inlet receptacle for precise testing of corded
products. The S07 cable is connected to the Sentry Plus Series instrument via a two-lead set.
1. Remove DUT’s power cord form its AC inlet module.
2. Plug S07 Power entry adapter into DUT’s AC inlet module.
3. Connect the white custom banana plug to the Sentry Plus OUTPUT terminal. Connect
black banana plug with retaining bracket to the Sentry Plus RTN/LOW terminal.
4. For GC test, connect GC Lead (700100) to rear Sentry Cont Check terminal and metal on
case of DUT.
Figure 3-7 illustrates this connection of the S07 cable to a Sentry 30 Plus instrument.
REAR Sentry Plus Instrument
!

WARNING: FOR CONTINUED PROTECTION
AGAINST FIRE HAZARD, REPLACE ONLY WITH
THE SAME TYPE AND RATING OF FUSE AS
SPECIFIED FOR THE LINE VOLTAGE BEING
UTILIZED.

CAUTION: NO OPERATOR SERVICEABLE PARTS
INSIDE. REFER SERVICING TO QUALIFIED
PERSONNEL.

FAN 50o C AUTO ON/OFF

POLLUTION DEGREE 2
INSTALLATION CATEGORY II

VOLTAGE SELECTOR
90V - 110V ~
108V - 132V ~
198V - 242V ~
216V - 250V ~

CONT. CHECK OPTION

3.15AT
250V

START

1.6AT
250V

RESET

COM

MODEL NO.

100V/120V/220V/240V~
50/60Hz 300W MAX

SERIAL NO.

INTER
LOCK

HIGH VOLTAGE
Max 5kVAC/6kVDC

HV OUTPUT

RTN/LOW

STOP

QuadTech

Sentry 30 Plus AC/DC/IR Hipot Tester

F1
F2
START

F3
F3

Ground Continuity Connection

CAL

UPDATE

PASS

FAIL

OUTPUT

DANGER

RTN/LOW

CAUTION
Max 5kVAC
6kVDC

Remove DUT's power
cord
from AC inlet module

Black
Banana
Plug with
Retaining
Bracket
to
RTN/LOW

3
Hipot
Connection

Custom
White
Banana
Plug
to
OUTPUT

S07
Power Entry
Adapter
DUT
(Monitor)

Plug S07 Adapter into
DUT's AC inlet module

Figure 3-7: S07 Power Entry Adapter Cable
Interface

Page 71 of 85

3.4

S03 Corded Product Adapter (115V)

The S03 Corded Product Adapter is a 3-prong electrical outlet box to facilitate testing of corded
products. The S03 cable is connected to the Sentry Plus Series instrument via a two-lead set.
1. Connect the black banana plug to the Sentry Plus RTN/LOW.
2. Connect the white banana plug to the Sentry Plus OUTPUT terminal.
3. Plug the DUT’s 3-wire power cord into the S03 corded product adapter.
4. For GC test, connect GC Lead (700100) to rear Sentry Cont Check terminal and metal on
case of DUT.
Figure 3-8 illustrates this connection of the S03 cable to a Sentry 30 Plus instrument.
!

WARNING: FOR CONTINUED PROTECTION
AGAINST FIRE HAZARD, REPLACE ONLY WITH
THE SAME TYPE AND RATING OF FUSE AS
SPECIFIED FOR THE LINE VOLTAGE BEING
UTILIZED.

CAUTION: NO OPERATOR SERVICEABLE PARTS
INSIDE. REFER SERVICING TO QUALIFIED
PERSONNEL.

FAN 50o C AUTO ON/OFF

POLLUTION DEGREE 2
INSTALLATION CATEGORY II

VOLTAGE SELECTOR
90V - 110V ~
108V - 132V ~
198V - 242V ~
216V - 250V ~

CONT. CHECK OPTION

3.15AT
250V

START

1.6AT
250V

RESET

COM

MODEL NO.

100V/120V/220V/240V~
50/60Hz 300W MAX

SERIAL NO.

INTER
LOCK

HIGH VOLTAGE
Max 5kVAC/6kVDC

RTN/LOW

STOP

QuadTech

Sentry 30 Plus AC/DC/IR Hipot Tester
F1

F2
START

F3
F3
F4

CAL

UPDATE

PASS

FAIL

OUTPUT

DANGER

RTN/LOW

CAUTION
Max 5kVAC
6kVDC

Ground Continuity Connection

HV OUTPUT

1
3

QuadTech

Black
Banana
Plug
to
RTN/LOW

DUT plugged into
S03 Adapter

20A

Hipot
Connection

Custom
White
Banana
Plug
to
OUTPUT

125V

DO NOT TOUCH WHILE UNDER TEST

MAX. VOLTAGE
5kVAC
6kVDC

DUT (Monitor)

S03 Corded
Product Adapter

Figure 3-8: S03 Corded Product Adapter

Page 72 of 85

Interface

3.5

S05 Foot Switch

The S05 Foot Switch provides hands-free remote testing capability. The spade leads on the S05
Foot Switch are connected (screwed) to the terminal strip on the rear panel of the Sentry Plus
Series instrument.
1. Connect (screw) the white wire/spade connector to the START terminal.
2. Connect (screw) the red wire/spade connector to the COM terminal.
Figure 3-9 illustrates this connection of the S05 Foot Switch to a Sentry 30 Plus instrument.
Terminal Strip rear of Sentry 30 Plus
!

WARNING: FOR CONTINUED PROTECTION
AGAINST FIRE HAZARD, REPLACE ONLY WITH
THE SAME TYPE AND RATING OF FUSE AS
SPECIFIED FOR THE LINE VOLTAGE BEING
UTILIZED.

CAUTION: NO OPERATOR SERVICEABLE PARTS
INSIDE. REFER SERVICING TO QUALIFIED
PERSONNEL.

FAN 50o C AUTO ON/OFF

POLLUTION DEGREE 2
INSTALLATION CATEGORY II

VOLTAGE SELECTOR
90V - 110V ~
108V - 132V ~
198V - 242V ~
216V - 250V ~

3.15AT
250V

CONT. CHECK OPTION
START

1.6AT
250V

RESET

COM

MODEL NO.

100V/120V/220V/240V~
50/60Hz 300W MAX

SERIAL NO.

INTER
LOCK

HIGH VOLTAGE
Max 5kVAC/6kVDC

HV OUTPUT

RTN/LOW

White
Wire &
Spade
to
Terminal
Strip:
START

Red
Wire &
Spade
to
Terminal
Strip:
COM

S05 Foot Switch

Figure 3-9: S05 Foot Switch

Interface

Page 73 of 85

3.6

S08 Gun Probe

The S08 Gun Probe provides fast testing capability with pinpoint control. Use the black lead of
the S02 Lead Set with the S08 Gun Probe.
1. Connect the S02 black banana plug to the Sentry Plus RTN/LOW terminal.
2. Connect the S02 black alligator clip to the low side of the DUT.
3. Connect the white banana plug to the Sentry Plus OUTPUT terminal.
Figure 3-10 illustrates this connection of the S08 probe to a Sentry 30 Plus unit.
STOP

QuadTech

Sentry 30 Plus AC/DC/IR Hipot Tester
F1

F2
START

F3
F4

CAL

UPDATE

PASS

FAIL

OUTPUT

DANGER

RTN/LOW

CAUTION
Max 5kVAC
6kVDC

Use S02 Lead:
Black Banana Plug
to RTN/LOW

3
Custom
White
Banana
Plug
to
OUTPUT

S08
GUN PROBE

Rack
of
DUTs

Figure 3-10: S08 Gun Probe connected to Sentry 30 Plus Hipot Tester

Page 74 of 85

Interface

3.7

S50 Plus Ground Bond Tester

The Sentry Plus Series instrument can be connected to the Sentry 50 Plus Ground Bond Tester
for high current ground testing between chassis and power cord ground. The output current is
programmable from 1A to 30A AC in 0.01A increments and resistance can be measured over the
range 0.1mΩ to 510mΩ. The rear panels of the Sentry Plus Series instrument and Sentry 50 Plus
instrument are connected via the S15 9-pin interconnection cable. Figure 3-11 illustrates the
front panel connections of the two instruments. NOTE: GFI must be turned OFF on the Sentry
Plus unit when it is used with the Sentry 50 Plus instrument.
STOP

QuadTech

Sentry 30 Plus AC/DC/IR Hipot Tester

F1
F2
START

F3
F3
F4

CAL

UPDATE

PASS

FAIL

OUTPUT

DANGER

RTN/LOW

CAUTION
Max 5kVAC
6kVDC

Sentry 30 Plus AC/DC/IR Hipot Tester

Banana/Banana Cable

STOP

QuadTech

PASS

DANGER
F1

START

FAIL

Sentry 50 Plus GROUND BOND TESTER

HIGH
CURRENT

F3
F4

DRIVE

SENSE

RTN/LOW

SENSE

+
S50 Plus Ground Bond Tester

G15
Banana to
Alligator
Cable

DUT
(Monitor)

DUT
plugged into
G13

QuadTech

20A

G13
Corded
Product
Adaptor

125
V

DO NOT TOUCH WHILE
UNDER TEST
MAX.
VOLTAGE
5kVAC
6kVDC

Figure 3-11: Guardian 1030S & Sentry 50 Plus Connection

Interface

Page 75 of 85

Section 4: Service & Calibration
4.1

General

Our warranty (at the front of this manual) attests to the quality of materials and workmanship in
out products. If malfunction should be suspected, or other information desired, applications
engineers are available for technical assistance. Applications assistance is available in the U.S.
by calling (978) 461-2100 and asking for Applications Support. For support outside of the
United States please contact your local QuadTech Distributor. Service/Calibration and
Distributor information is also available online.
4.2

Instrument Return

Before returning an instrument to QuadTech for service please call our Customer Care Center
(CCC) at 800-253-1230 for Return Material Authorization (RMA). It will be necessary to
include a Purchase Order Number to insure expedient processing, although units found to be in
warranty will be repaired at no-charge. For any questions on repair costs or shipping instructions
please contact our CCC Department at the afore-mentioned number. To safeguard an instrument
during storage and shipping, please use packaging that is adequate to protect it from damage, i.e.
equivalent to the original packaging, and mark the box “Delicate Electronic Instrument”. Return
material should be sent freight prepaid to:
QuadTech, Inc.
5 Clock Tower Place, 210 East
Maynard, Massachusetts 01754
Attention: RMA#
Shipments sent collect cannot be accepted.

4.3

Calibration

Calibration of the Sentry Plus Series instruments is recommended on an annual basis. If the unit
is returned to QuadTech for factory calibration, refer to paragraph 4.2 for RMA and shipping
instructions. Using the calibration procedure in paragraph 4.3.1, the Sentry Plus Series
instrument may be calibrated by a qualified service person IF traceable calibration equipment
and standards are available. The instrument should be powered up for a minimum of 30
minutes prior to calibration to ensure maximum stability.

Service & Calibration

Page 77 of 85

Table 4-1: Calibration Equipment
Equipment
AC/DC High Voltage Voltmeter
AC/DC Current Meter
1GΩ Resistance Standard
100MΩ Resistance Standard
10MΩ Resistance Standard
500kΩ Resistance Standard

4.3.1

Requirements
Measure: 0 to 6kV, 0.1% accuracy
Measure: 0 to 40mA, 0.1% accuracy
250V
500V
1200V, 0.12mA, 0.25W; 500V; 1kV
1200V, 2.4mA, 0.25W

Equipment
250kΩ Res. Std
100kΩ Res. Std
80kΩ Res. Std
1Ω Resistor
3Ω Resistor

Requirements
1200V, 5mA, 5W; 1250V 7mA
400V, 4mA, 50W; 1200V 12mA
1200V, 15mA, 100W
0.1A
0.1A

Calibration Parameters

Table 4-2 contains the calibration parameters for the Sentry Plus Series instruments. All tests
points are not required for each of the instruments (10 Plus, 20 Plus & 30 Plus).
Table 4-2: Calibration Parameters
PRODUCT
TEST
Voltage Calibration
10/20/30
CAL
ACV
10/20/30
CAL
ACV
20/30
CAL
DCV
20/30
CAL
DCV
30
CAL
IR
30
CAL
IR
Current Calibration
10/20/30
CAL
ACA
10/20/30
CAL
ACA
10/20/30
CAL
ACA
10/20/30
CAL
ACA
20/30
CAL
DCA
20/30
CAL
DCA
20/30
CAL
DCA
20/30
CAL
DCA
WAC & WDC Arcing Calibration
10/20/30
CAL
AC ARC
20/30
CAL
DC ARC
IR Resistance Calibration
30
CAL
IRR Range1
30
CAL
IRR Range2
30
CAL
IRR Range3
30
CAL
IRR Range4
Ground Continuity Calibration
10/20/30
CAL
GC
10/20/30
CAL
GC
Contrast Calibration
10/20/30
CAL
CONTRAST

Page 78 of 85

RANGE

CAL. POINT

5kV
5kV
6kV
6kV
1kV
1kV

OFST
FULL
OFST
FULL
OFST
FULL

0.050kV
4.000kV
0.050kV
4.000kV
0.050kV
1.000kV

3mA
3mA
15mA
15mA
3mA
3mA
5mA
5mA

OFST
FULL
OFST
FULL
OFST
FULL
OFST
FULL

0.12mA / 10MΩ
2.4mA / 500kΩ
2.4mA / 500kΩ
12mA / 100kΩ
0.12mA / 10MΩ
2.4mA / 500kΩ
2.4mA / 500kΩ
4.8mA / 250kΩ

15mA
5mA

Arc
Arc

7.00mA
5.00mA

1000MΩ
100MΩ
10MΩ
10MΩ

Range 1
Range 2
Range 3
Range 4

1000M = 1.00GΩ
100.0MΩ
10.0MΩ
10.0MΩ

1Ω
3Ω

OFST
FULL

1Ω
3Ω

Service & Calibration

4.3.2

Enable Calibration

The instrument should be powered up for a minimum of 30 minutes prior to calibration to
ensure maximum stability. With the Sentry Plus Series instrument in standby status ([STOP]
button previously pressed and no warning lights flashing) remove the Calibration seal over the
hole labeled “CAL’ on the front panel and push the recessed switch to the IN position.
The unit is in STAND BY status.
Press [F3] = MENU.
Press [F2] = DOWN three times until CALIBRATION is highlighted (backlit).
Press [F3] = SELECT to choose calibration function.
Display will prompt for a password.
Press [A] [A] [A] [B] [ENTER]
Cal Step 1: ‘ACV 5kV Offset (50V)’ is displayed on the screen.
NOTE
The ‘Calibration is OFF’ display may occur if the CAL recessed switch has not been pressed IN
prior to entering Calibration function.

Figure 4-1: Calibration Password Prompt
NOTE:
When in the Calibration Routine:
Pressing [UP] or [DOWN] scrolls through the calibration steps.
Pressing [START] initiates the calibration of the particular step
Pressing [INC.] or [DEC.] adjusts the Standard Value
Pressing [ENTER] accepts the calibration value.
Pressing [STOP] completes calibration of the particular step.

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4.3.3

AC Voltage Calibration

Connect the OUTPUT terminal of the Sentry Plus Series unit to the input terminal of the AC/DC
high voltage meter. Connect the RTN/LOW terminal of the Sentry Plus to the GND terminal of
the voltmeter. Set the voltmeter to AC and 2kV range.
Cal Step 1: ‘ACV 5kV Offset (50V)’
Press [STOP] to return instrument to steady state.
Press [START] to get offset value.
Press [F1] = INC or [F2] = DEC until the Sentry Plus display reads the same as the voltmeter.
Press [ENTER] to accept reading.
Sentry Plus reverts to “ACV Offset” display (incorporating new cal value).
Press [F1] = UP to go to Cal Step 2: ‘ACV 5kV Full (4kV)’. Change voltmeter range to 20kV.
Press [STOP] to return instrument to steady state.
Press [START] to get full value
Press [F1] = INC or [F2] = DEC until the Sentry Plus display reads the same as the voltmeter.
Press [ENTER] to accept reading.
Sentry Plus reverts to “ACV Full” display (incorporating new cal value).

4.3.4

DC Voltage Calibration (DCV)

Change the setting on the Valhalla voltmeter to DC and 2kV range. DC calibration is applicable
to the Sentry 20 Plus and Sentry 30 Plus instruments.
Press [F1] = UP to go to Cal Step 3: ‘DCV 6kV Offset (50V)’.
Press [STOP] to return instrument to steady state.
Press [START] to get offset value.
Press [F1] = INC or [F2] = DEC until the Sentry Plus display reads the same as the voltmeter.
Press [ENTER] to accept reading.
Sentry Plus reverts to “DCV Offset” display (incorporating new cal value).
Press [F1] = UP to go to Cal Step 4: ‘DCV 6kV Full (4kV)’. Change voltmeter range to 20kV.
Press [STOP] to return instrument to steady state.
Press [START] to get full value.
Press [F1] = INC or [F2] = DEC until the Sentry Plus display reads the same as the voltmeter.
Press [ENTER] to accept reading.
Sentry Plus reverts to “DCV Full” display (incorporating new cal value).

Page 80 of 85

Service & Calibration

4.3.5

IR Voltage Calibration (IRV)

Keep the setting on the Valhalla voltmeter at DC and 2kV range. IR calibration is applicable to
the Sentry 30 Plus instrument.
Press [F1] = UP to go to Cal Step 5: ‘IRV 1kV Offset (50V)’.
Press [STOP] to return instrument to steady state.
Press [START] to get offset value.
Press [F1] = INC or [F2] = DEC until the Sentry Plus display reads the same as the voltmeter.
Press [ENTER] to accept reading.
Sentry Plus reverts to “IRV Offset” display (incorporating new cal value).
Press [F1] = UP to go to Cal Step 6: ‘IRV 1kV Full (1kV)’. Change voltmeter range to 20kV.
Press [STOP] to return instrument to steady state.
Press [START] to get full value.
Press [F1] = INC or [F2] = DEC until the Sentry Plus display reads the same as the voltmeter.
Press [ENTER] to accept reading.
Sentry Plus reverts to “IRV Full” display (incorporating new cal value).

Service & Calibration

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4.3.6

AC Current Calibration (ACA)

Connect the OUTPUT terminal of the Sentry Plus Series instrument to a resistance box or
resistance standard. Connect an AC/DC current meter in series between the resistance load
(box/standard) and the RTN/LOW terminal of the Sentry Plus instrument. Table 4-3 lists the
resistance loads necessary for the current calibration steps.
Table 4-3: Resistance Loads
Mode

Step #

Voltage

ACA
ACA
ACA
ACA
DCA
DCA
DCA
DCA

CAL 7
CAL 8
CAL9
CAL 10
CAL 11
CAL 12
CAL 13
CAL 14

1200 V
1200 V
1200 V
1200 V
1200 V
1200 V
1200 V
1200 V

Calibration
Point
0.12mA
2.4mA full
2.4mA
12mA
0.12mA
2.4mA full
2.4mA
4.8mA

Resistance
(Load)
10MΩ
500kΩ
500kΩ
100kΩ
10MΩ
500kΩ
500kΩ
250kΩ

Press [F1] = UP to go to Cal Step 7: ‘ACA 3mA Offset (0.12mA)’.
Press [STOP] to return instrument to steady state.
Press [START] to get offset value.
Press [F1] = INC or [F2] = DEC until the SPlus display reads the same as the current meter.
Press [ENTER] to accept reading.
Sentry Plus reverts to “ACA 3mA Offset” display (incorporating the new cal value).
Press [F1] = UP to go to Cal Step 8: ‘ACA 3mA Full (2.4mA)’.
Press [STOP] to return instrument to steady state.
Press [START] to get full value.
Press [F1] = INC or [F2] = DEC until the SPlus display reads the same as the current meter.
Press [ENTER] to accept reading.
Sentry Plus reverts to “ACA 3mA Full” display (incorporating the new cal value).
Press [F1] = UP to go to Cal Step 9: ‘ACA 15mA Offset (2.4mA)’.
Press [STOP] to return instrument to steady state.
Press [START] to get offset value.
Press [F1] = INC or [F2] = DEC until the SPlus display reads the same as the current meter.
Press [ENTER] to accept reading.
Sentry Plus reverts to “ACA 30mA Offset” display (incorporating the new cal value).
Press [F1] = UP to go to Cal Step 10: ‘ACA 15mA Full (12mA)’.
Press [STOP] to return instrument to steady state.
Press [START] to get full value.
Press [F1] = INC or [F2] = DEC until the SPlus display reads the same as the current meter.
Press [ENTER] to accept reading.
Sentry Plus reverts to “ACA 30mA Full” display (incorporating the new cal value).

Page 82 of 85

Service & Calibration

4.3.7 DC Current Calibration
Connect the OUTPUT terminal of the Sentry Plus Series instrument to a resistance box or
resistance standard. Connect an AC/DC current meter in series between the resistance load
(box/standard) and the RTN/LOW terminal of the Sentry Plus instrument.
Press [F1] = UP to go to Cal Step 11: ‘DCA 3mA Offset (0.12mA)’.
Press [STOP] to return instrument to steady state.
Press [START] to get offset value.
Press [F1] = INC or [F2] = DEC until the SPlus display reads the same as the current meter.
Press [ENTER] to accept reading.
Sentry Plus reverts to “DCA 3mA Offset” display (incorporating the new cal value).
Press [F1] = UP to go to Cal Step 12: ‘DCA 3mA Full (2.5mA)’.
Press [STOP] to return instrument to steady state.
Press [START] to get full value.
Press [F1] = INC or [F2] = DEC until the SPlus display reads the same as the current meter.
Press [ENTER] to accept reading.
Sentry Plus reverts to “DCA 3mA Full” display (incorporating the new cal value).
Press [F1] = UP to go to Cal Step 13: ‘DCA 5mA Offset (2.4mA)’.
Press [STOP] to return instrument to steady state.
Press [START] to get offset value.
Press [F1] = INC or [F2] = DEC until the SPlus display reads the same as the current meter.
Press [ENTER] to accept reading.
Sentry Plus reverts to “DCA 15mA Offset” display (incorporating the new cal value).
Press [F1] = UP to go to Cal Step 14: ‘DCA 5mA Full (4.8mA)’.
Press [STOP] to return instrument to steady state.
Press [START] to get full value.
Press [F1] = INC or [F2] = DEC until the SPlus display reads the same as the current meter.
Press [ENTER] to accept reading.
Sentry Plus reverts to “DCA 15mA Full” display (incorporating the new cal value).

Service & Calibration

Page 83 of 85

4.3.8

ARC Calibration

ARC calibration is part of the calibration routine but it is not performed on the Sentry Plus
instruments. ARC Calibration is set at the factory. To by-pass these two steps:
Press [F1] = UP to go to Cal Step 15: ‘AC ARC 15mA (7mA)’. BY-PASS
Press [F1] = UP to go to Cal Step 16: ‘DC ARC 5mA (5mA)’. BY-PASS

4.3.9

IR Resistor Calibration (IRR)

Connect the resistance load (per Table 4-2) between the Sentry Plus instrument’s OUTPUT
terminal and RTN/LOW terminal.
Press [F1] = UP to go to Cal Step 17: ‘IRR Range1 (1GΩ)’.
Press [STOP] to return instrument to steady state.
Press [START] to get range1 value.
Press [F1] = INC or [F2] = DEC until the Splus display reads the same as certified load value.
Press [ENTER] to accept reading.
Sentry Plus reverts to “IRR Range1” display (incorporating the new cal value).
Press [F1] = UP to go to Cal Step 18: ‘IRR Range2 (100MΩ)’.
Press [STOP] to return instrument to steady state.
Press [START] to get range2 value.
Press [F1] = INC or [F2] = DEC until the SPlus display reads the same as certified load value.
Press [ENTER] to accept reading.
Sentry Plus reverts to “IRR Range2” display (incorporating the new cal value).
Press [F1] = UP to go to Cal Step 19: ‘IRR Range3 (10MΩ)’.
Press [STOP] to return instrument to steady state.
Press [START] to get range3 value.
Press [F1] = INC or [F2] = DEC until the SPlus display reads the same as certified load value.
Press [ENTER] to accept reading.
Sentry Plus reverts to “IRR Range3” display (incorporating the new cal value).
Press [F1] = UP to go to Cal Step 20: ‘IRR Range4 (10MΩ)’.
Press [STOP] to return instrument to steady state.
Press [START] to get range4 value.
Press [F1] = INC or [F2] = DEC until the SPlus display reads the same as certified load value.
Press [ENTER] to accept reading.
Sentry Plus reverts to “IRR Range4” display (incorporating the new cal value).

Page 84 of 85

Service & Calibration

4.3.10 Ground Continuity Calibration
GC 5Ω
Ω Offset (1Ω
Ω)
Connect a 1Ω load resistor between the Sentry Plus instrument’s rear panel RTN/LOW terminal
and Ground Continuity Option terminal.
Press [F1] = UP to go to Cal Step 21: ‘GC 5Ω Offset (1Ω)’.
Press [STOP] to return instrument to steady state.
Press [START] to get offset value.
Press [F1] = INC or [F2] = DEC until the Splus display reads the same as certified load value.
Press [ENTER] to accept reading.
Sentry Plus reverts to “GC 5Ω Offset” display (incorporating the new cal value).
GC 5Ω
Ω Full (3Ω
Ω)
Connect a 3Ω load resistor between the Sentry Plus instrument’s rear panel RTN/LOW terminal
and Ground Continuity Option terminal.
Press [F1] = UP to go to Cal Step 22: ‘GC 5Ω Full (3Ω)’.
Press [STOP] to return instrument to steady state.
Press [START] to get full value.
Press [F1] = INC or [F2] = DEC until the SPlus display reads the same as certified load value.
Press [ENTER] to accept reading.
Sentry Plus reverts to “GC 5Ω Full” display (incorporating the new cal value).
4.3.11 Contrast Calibration
This calibration step is by-passed. If setup is selected, the display contrast will be set to a level
of 7. Display contrast can be adjusted as specified in paragraph 2.15.2.1.

4.3.12 Finalize Calibration
When all calibration steps are complete:
Press [F4] = EXIT
Release the [CAL] enable switch to the OUT position using the tip of a small screwdriver.
1. Press [F2] = DOWN three times.
2. Press [F3] = SELECT
3. Display prompts: ‘PASSWORD’.
4. Press [A] [A] [A] [A] [ENTER]
5. Display prompts: ‘Select Software Calibration?’
6. Press [F1] = ON to set Calibration Values ON.

Service & Calibration

Page 85 of 85

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