AEMC AEMC 6529 Manual

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Megohmmeter
Models 6528 and 6529

5 Commonwealth Ave
Woburn, MA 01801
Phone [phone] Toll
Free 1-800-517-8431

User Manual

■ TRMS MEGOHMMETER

ENGLISH

www.aemc.com

Copyright © Chauvin Arnoux®, Inc. d.b.a. AEMC® Instruments. All rights reserved.

No part of this documentation may be reproduced in any form or by any means (including electronic storage and retrieval or translation into any other
language) without prior agreement and written consent from Chauvin Arnoux

Chauvin Arnoux

®

, Inc. d.b.a. AEMC® Instruments

®

, Inc., as governed by United States and International copyright laws.

15 Faraday Drive • Dover, NH 03820 USA
Tel: [phone] or [phone] • Fax: [phone]

®

This documentation is provided “as is,” without warranty of any kind, express, implied, or otherwise. Chauvin Arnoux
effort to ensure that this documentation is accurate; but does not warrant the accuracy or completeness of the text, graphics, or other information con­tained in this documentation. Chauvin Arnoux

®

, Inc. shall not be liable for any damages, special, indirect, incidental, or inconsequential; including (but

, Inc. has made every reasonable

not limited to) physical, emotional or monetary damages due to lost revenues or lost prots that may result from the use of this documentation, whether
or not the user of the documentation has been advised of the possibility of such damages.

Chauvin Arnoux

®

, Inc, AEMC®, and DataView® are registered trademarks of AEMC® Instruments.

2

Megohmmeter Models 6528/6529

Statement of Compliance

Chauvin Arnoux®, Inc. d.b.a. AEMC® Instruments certifies that this
instrument has been calibrated using standards and instruments
traceable to international standards.

We guarantee that at the time of shipping your instrument has met its
published specifications.

An NIST traceable certificate may be requested at the time of purchase,
or obtained by returning the instrument to our repair and calibration
facility, for a nominal charge.

The recommended calibration interval for this instrument is 12 months
and begins on the date of receipt by the customer. For recalibration,
please use our calibration services.

Serial #: ________________________________

Catalog #: 2126.54 / 2126.55

Model #: 6528 / 6529

Please fill in the appropriate date as indicated:

Date Received: _________________________________

Date Calibration Due: _______________________

Megohmmeter Models 6528/6529

3

MEASUREMENT CATEGORIES

770 V

Thank you for purchasing the TRMS Megohmmeter Model 6528 or 6529. For best results with your instrument:

■ Read

■ Respect

this user manual carefully

precautions for use

AC - Alternating current DC - Direct Current

AC or DC Double insulated

Shock Hazard Fuse

Battery

Instrument follows recycling
directives

Sorting for the recycling of electric
and electronic waste

Danger Hazard

Definition of Measurement Categories (CAT)

Instructions that must be read
and understood

Comply with US directives

Earth Ground

Voltage on the instrument should
not exceed 770V

RMS

■ CAT IV: Test and measurement circuits connected to the source of the building’s low-voltage network installation.

Example: Measur

■ CAT III: Test and measurement circuits connected to parts of the building’s low voltage network installation.

Example: Measurement on distribution switchboards (including secondary meters), the circuit breakers, cabling including
cables, busbars, junction boxes, circuit breakers, power outlets in the xed installation and industrial instruments and
other equipment such as motors permanently connected to the xed installation.

■ CAT II: Test and measurement circuits directly connected to points of use (power outlets and other similar points) on
the low voltage network.

Example: Measurement on circuits in network for household appliances, portable tools and other similar instruments.

ement on equipment installed upstream of the main fuse or building installation cut-off switch.

4

Megohmmeter Models 6528/6529

PRECAUTIONS FOR USE

Failure to comply with safety instructions can create a risk of electric shock, re, explosion and destruction of the instrument
or the installations. If the instrument is used other than as specied in this User Manual, the protection provided by the
instrument may be impaired.

■ The operator and/or the responsible authority must carefully read and clearly understand the various precautions to be

taken in use.

■ Before using the instrument, make sure it functions properly by measuring a known voltage and a known insulation

resistor, and check continuity by short circuiting both test leads.

■ Do not use the instrument in an explosive atmosphere or in the presence of inammable gas or smoke.

■ Do not use the instrument on networks with a rated voltage or category higher than those listed in this manual.

■ Respect the maximum rated voltages and currents between terminals and in relation to the earth.

■ Do not use the instrument if it seems damaged, incomplete, or incorr

■ Before each use, check the condition of the cable insulation, the instrument, and its accessories. All elements on which

the insulation is damaged (even partially) must be put out of service for r

■ Use cables and accessories for voltage accor

those of the instrument. If not, an accessory of a lower category reduces the category of the combined megohmmeter
plus the accessory to that of the accessory.

■ Respect the envir

■ Strictly comply with the fuse specications. Disconnect all cables befor

■ Do not modify

be performed by qualied, approved personnel.

■ Replace the battery as soon as the symbol appears on the display. Disconnect all cables before opening the

battery access cover.

■ Use personal protection equipment (PPE) when conditions require it.

■ Keep your hands and ngers away from the unused instrument terminals. When handling sensors or test probes, do

not place ngers beyond the physical nger guard.

onmental conditions of use.

the instrument, and, do not replace components using equivalent parts. Repairs and adjustments must

ding to IEC 61010-031 and measurement categories at least equal to

ectly closed.

epair or disposed as waste.

e opening the fuse access cover.

Megohmmeter Models 6528/6529

5

TABLE OF CONTENTS

1.INTRODUCTION .......................................................................................................... 7

1.1 Receiving Your Shipment ...................................................................................................................................... 7

Ordering Information .............................................................................................................................................7

1.2

1.3

Accessories ........................................................................................................................................................... 8

Replacement Parts

1.4

2.OVERVIEW .................................................................................................................. 8

2.1 Description ............................................................................................................................................................8

2.2

Insulation Resistance

Megohmmeter Models 6528 & 6529 — Front V

2.3

2.4

2.5

2.6 Terminals ............................................................................................................................................................. 11

2.7 

2.8

2.9

2.10

1

2.1

2.12

Button and Function Keys

TEST

Instrument Display

Conguration

Alarm Buzzer

Permanent Mode ................................................................................................................................................. 12

Backlight (BL) ......................................................................................................................................................12

Firmware V

Alarm Functions and Indicators ........................................................................................................................... 13

ersion ................................................................................................................................................. 12

................................................................................................................................................ 8

Testing Principal of Operation

......................................................................................................................... 10

..............................................................................................................................................10

 Mode ............................................................................................................................................. 11

....................................................................................................................................................... 12

............................................................................................9

iew ..............................................................................................9

3.OPERATION .............................................................................................................. 14

3.1 Battery Installation ...............................................................................................................................................14

3.2 Instrument Check ................................................................................................................................................14

3.3

Power Supply and Battery Life

3.4

Stand, Door or Magnetic Mount

3.5

AC+DC or DC V

3.6 Continuity ............................................................................................................................................................16

3.7 Resistance ..........................................................................................................................................................17

3.8

Insulation

oltage .........................................................................................................................................15

Resistance Tests .................................................................................................................................18

............................................................................................................................ 14

..........................................................................................................................15

4. MAINTENANCE ......................................................................................................... 24

4.1 Cleaning ..............................................................................................................................................................24

4.2 200mA Fuse Test.................................................................................................................................................24

4.3

Battery and Fuse Replacement

........................................................................................................................... 24

5. GENERAL SPECIFICATIONS ..................................................................................... 25

6. ELECTRICAL SPECIFICATIONS ................................................................................ 26

6.1 General Condition of Reference ..........................................................................................................................26

6.2 AC/DC Voltage Measurement ............................................................................................................................. 26

6.3 Ground Bond Continuity Measurement ...............................................................................................................26

Ground Bond Resistance Measurement ............................................................................................................. 26

6.4

6.5  Insulation Resistance Specication  ....................................................................................................................27

7. REPAIR AND CALIBRATION ...................................................................................... 28

8. TECHNICAL AND SALES ASSISTANCE ..................................................................... 28

9. LIMITED WARRANTY ................................................................................................ 29

6

Megohmmeter Models 6528/6529

1.INTRODUCTION

1.1 Receiving Your Shipment

Upon receiving your shipment, make sure that the contents are consistent with the packing list. Notify your distributor of any
missing items. If the equipment appears to be damaged, le a claim immediately with the carrier and notify your distributor
at once, giving a detailed description of any damage. Save the damaged packing container to substantiate your claim.

1.2 Ordering Information

Megohmmeter Model 6528 (Digital, 250V, 500V, 1kV, 420K-Ohm, V, Continuity, Alarm & Timer) ................... Cat. #2126.54

Megohmmeter Model 6529 (Digital, 50V, 100V, 250V, 500V, 1kV,420k-Ohm, V, Continuity, Alarm & Timer,

PI/DAR) .............................................................................................................................................................Cat. #2126.55

Both models include soft carrying case, set of (2) 5 ft color-coded silicone leads, (2) color-coded alligator clips, (2) color­coded test probes (red/black), {Rated 1000V CAT IV, UL V2}, (6) 1.5V AA batteries and a user manual.

(1) of the following Megohmmeter Models:
Model 6528 Cat. #2126.54 or
Model 6529 Cat. #2126.55

Lead – set of (2), 5 ft silicone color-coded (red/
black) with 4mm straight/right angle banana plugs
(Rated 1000V CAT IV, UL)

Cat. #5000.94

Also includes 6 AA batteries and a user manual.

Megohmmeter Models 6528/6529

(1) Pouch – replacement for Models 1026, 6528, & 6529
(7 x 8.5 x 2”)

Cat. #2117.73

Probe – black test probe (Rated
1000V CAT IV, 15A, UL V2)

Cat. #5000.97

Probe – red test probe (Rated
1000V CAT IV, 15A, UL V2)

Cat. #5000.98

Clip – safety alligator – black
(Rated 1000V CAT IV, 15A, UL V2)

Cat. #5000.99

Clip – safety alligator – red (Rated
1000V CAT IV, 15A, UL V2)

Cat. #5100.00

7

1.3 Accessories

Continuity Probe for use with Megohmmeters and Installation Testers ........................... Cat. #2138.54

1.4 Replacement Parts

Pouch – replacement for Models 1026, 6528, & 6529 (7 x 8.5 x 2”) ................................................................Cat. #2117.73

Lead – set of (2), 5 ft silicone color-coded (red/black) with 4mm straight/right angle banana plugs

(Rated 1000V CAT IV, UL) .................................................................................................................................Cat. #5000.94

Fuse – set of 2, FF, 200mA, 1000V, 10kA, 6x32mm .........................................................................................Cat. #2971.04

Probe – black test probe (Rated 1000V CAT IV, 15A, UL V2) ........................................................................... Cat. #5000.97

Probe – red test probe (Rated 1000V CAT IV, 15A, UL V2) ..............................................................................Cat. #5000.98

Clip – safety alligator – black (Rated 1000V CAT IV, 15A, UL V2) ....................................................................Cat. #5000.99

Clip – safety alligator – red (Rated 1000V CAT IV, 15A, UL V2) ........................................................................ Cat. #5100.00

For accessories and replacement parts, visit our store at www.aemc.com.

2.OVERVIEW

2.1 Description

The Megohmmeter Models 6528 and 6529 are portable measuring instruments with digital displays. They are powered
by batteries. These instruments can check the safety of electrical insulation. For example, they can be used to test new
insulation before they are powered up, check existing insulation in a power-off condition, or troubleshoot potential faulty
insulation.

Features include:

Model 6528 Model 6529

Insulation test voltages 250, 500, and 1000V 50, 100, 250, 500, and 1000V

Insulation Resistance

PI and DAR ratios calculation

Continuity measurement

Resistance measurement

Programmable alarms

 

–


 
 
 

8

Megohmmeter Models 6528/6529

2.2 Insulation Resistance Testing Principal of Operation

Insulation resistance measurement is based on Ohm’s Law. By applying a known DC voltage and then measuring the
current owing, the instrument can determine the value of the resistance. In principle, the value of the insulation resistance
is very high, but not innite. Therefore, by measuring the low current owing, the instrument indicates the insulation
resistance value, providing a result in kΩ, MΩ, or GΩ. This resistance characterizes the quality of the insulation and
provides a good indication of the risks of leakage currents.

2.3 Megohmmeter Models 6528 & 6529 — Front View

HOLD

HOLD

V

Ω

kΩ

REL

MEGOHMMETER

Ω

0

OFF

MODEL 6528

P

V%
mA

AC

+

V

DC

kΩ
GΩ
MΩ

NOISE

SET-UP

Ω

0

250 V

V

500

1000 V

MΩ

Backlit LCD
display unit

TEST button

Four

Function Keys

Test Modes

Six (Model 6528)

Eight (Model 6529)

HOLD

HOLD

V

Ω

kΩ

PI
DAR

REL

MEGOHMMETER

Ω

0

OFF

MODEL 6529

P

V%
mA

AC

+

V

DC

kΩ
GΩ
MΩ

NOISE

SET-UP

Ω

0

50 V

V

100

250 V

500 V

1000 V

M

600 V CAT IV

FUSED

Megohmmeter Models 6528/6529

Ω

700 V

max

Fused

Test Lead Terminals

600 V CAT IV

Ω

FUSED

700 V

max

9

2.4 TEST Button and Function Keys









0

Ω

0



SET-UP

2.4.1 TEST Button

Pressing the TEST button starts an insulation measurement. It also serves to conrm a programmed threshold.

• Performs battery voltage check (§3.2)

• In resistance measurement, it is used to enter/exit the DMR mode and record the reference
measurement (§3.7.1)

• Starts insulation resistance test (§3.8)

2.4.2 Function Keys

Key

HOLD

Ω

▲, ►

2.5 Instrument Display

1. Indicates the measurement is on hold.

2. Indicates the Di󰀨erential Mode Resistance 

(DMR) or relative mode function is active in a
resistance measurement.

3. Indicates the resistance of the leads is
compensated in a continuity measurement.

4. Indicates auto-o󰀨 is deactivated.

5. Indicates the remaining battery life.

6. Indicates that the measurement is within or
outside of the alarm threshold set point.

7. Indicates the presence of a hazardous voltage.

8. Indicates the alarm is active in the insulation
or DMR measurement mode.

9. Indicates the audible buzzer is activated.

10. Indicates a voltage interference in a continuity
or resistance measurement.

DESCRIPTION

Freezes/unfreezes the measurement on the display. To unfreeze the display press HOLD key again.
In SET-UP mode, the function of the key

Toggle between AC+DC and DC (§3.5)
Activate/deactivate audible continuity indicator (§3.6) and insulation alarm (§3.7)

(short press) Activate/deactivate backlight (§2.10)

(long press) Perform lead compensation for continuity checks (§3.6.1)

SET-UP (>2s press): congure settings (§2.7)

(short press): select type of insulation test ( , , PI, DAR (Model 6529)) (§3.8)

Navigate the conguration menu (§2.7)

is to cycle through parameters.

1 2 3 4 5

HOLD

REL

Ω

P

0

V%
mA

AC

V

DC

kΩ
GΩ
MΩ

NOISE

Secondary Display

+

Primary Display

10

6 7 8 9 10

Megohmmeter Models 6528/6529

2.6 Terminals



SET-UP

The instrument has two measurement terminals: + (positive) and COM (common).

Ω

FUSED

700 V

max

2.7 Configuration Mode

Conguration mode enables you to set several options for the instrument. To open conguration mode, turn the rotary
switch to OFF. Then press and hold down the SET-UP
symbol ConF appears on the LCD.

key for >2s while turning the rotary switch to any position. The

V

OFF

Ω

kΩ

250 V

500

1000 V

V

MΩ

>2s

6528 rotary switch shown

Pressing the ▲ key cycles through parameters, and the ► key selects the setting for the displayed option. Available
parameters:

Insulation test mode buzzer enabled/disabled (§2.8)

P

1st press on ▲

Permanent mode enabled/disabled (§2.9)

2nd press on ▲

Backlighting enabled/disabled (§2.10)

3rd press on ▲

Firmware version number (display only, §2.11)

4th press on ▲

Return to the rst screen.

Switch the instrument off by turning the rotary switch to OFF. All of your changes are applied the next time the
instrument is turned ON.

Megohmmeter Models 6528/6529

11

2.8 Alarm Buzzer

P

To enable/disable the audible Alarm buzzer in Insulation mode:

1. Turn the rotary switch to OFF.

2. Press and hold down the SET-UP key for >2s turning the rotary switch to any position. The LCD momentarily

displays ConF to indicate the insturment is in conguration mode.

3. The symbol appears on the display. If this is set to ON, press ► to select OFF. When you restart the instrument,

the Alarm Buzzer will be disabled.

2.9 Permanent Mode

To help prolong battery life, by default the instrument’s auto-off is activated and turns off the display if it is idle for 10
minutes. Press the TEST button to awaken the instrument.

To deactivate auto-off:

1. Turn the rotary switch to OFF.

2. Press and hold down the SET-UP key for >2s turning the rotary switch to any position. The LCD momentarily

displays ConF to indicate the insturment is in conguration mode.

3. Press ▲ until

P

appears. If this is set to OFF, press ► to select ON.

When you restart the instrument, the auto-off is deactivated and the
mode is active.

appears on the LCD indicating the Permanent

2.10 Backlight (BL)

To help prolong battery life, by default the instrument’s Backlighting mode is deactivated (or auto-off of backight is
activated) and after 2 minutes the backlighting is switched off.

If you want the backlighting to stay on at all times:

1. Turn the rotary switch to OFF.

2. Press and hold down the SET-UP
displays ConF to indicate the insturment is in conguration mode.

3. Press▲until
on, automatic switching off of the backlighting will be deactivated and the backlighting will stay on at all times once

the

key has been pushed while the instrument is actively on.

appears. If this is set to OFF, press ► to select ON. The next time the instrument is switched

key for >2s while turning the rotary switch to any position. The LCD momentarily

2.11 Firmware Version

To display the rmware version number currently running on the instrument:

1. Turn the rotary switch to OFF.

2. Press and hold down the SET-UP key for >2s while turning the rotary switch to any position. The LCD will display ConF.

3. Press ▲ until SOFT appears; the rmware version appears in the primary display.

12

Megohmmeter Models 6528/6529

2.12 Alarm Functions and Indicators



SET-UP







2.12.1 Alarm Functions

The alarm functions make it possible to rapidly conrm that the readings are OK, without looking at the display. You can 

adjust the alarm function default settings by adjusting the thresholds.

Function

Insulation 50V* 50kΩ from 10kΩ to 399.9MΩ
Insulation 100V* 100kΩ from 20kΩ to 399.9MΩ

There are 7 alarm thresholds:

To program a threshold, set the switch to the desired function, long press the SET-UP

the beep sounds. The instrument displays the current threshold with the rst digit blinking.

Use the ▲ key to set the digit and the ► key to go to the next digit. When all 4 digits have been set, choose the unit number.
Conrm by pressing the TEST button.

V

Ω

kΩ

OFF

250 V

500

1000 V

MΩ

V

Insulation 250V 250kΩ from 50kΩ to 3.999GΩ
Insulation 500V 500kΩ from 100kΩ to 3.999GΩ
Insulation 1000V 1000kΩ from 200kΩ to 9.99GΩ
Continuity 1Ω 1Ω or 2Ω
Resistance DMR

* Model 6529 only

>2s

Default Threshold Programmable Threshold

5%

kΩ

HOLD

from 0.1 to 3999.9%

key for >2s and release it when

6528 rotary switch shown

To enable Alarm Mode, press the Alarm Buzzer
is below the alarm threshold, the meter emits a continous beep, the backlighting lights red and the × symbol is displayed.

Megohmmeter Models 6528/6529

key. The symbols and are displayed. If the measurement

13

3.OPERATION

3.1 Battery Installation

Place the batteries in the instrument as follows:

1. Use a Phillips screwdriver to remove the battery cover screw
on the back of the instrument (see illustration on right).

2. Install the batteries, respecting polarity. Requires 6 AA (LR6) batteries.

3. Replace the battery cover and tighten the screw.

3.2 Instrument Check

We recommend performing the following steps when using
the instrument for the rst time, or after a long period without use.

1. Start the instrument. Ensure all display segments are displayed.

2. Perform a Continuity check (§3.6). Ensure the LCD displays >42.0Ω with no input connected. Then short circuit both
terminals, the display should show 0Ω.

3. Turn the rotary switch to V, check a known voltage (for example a battery) and ensure that the measured voltage is correct.

4. Disconnect from the voltage source, and press the TEST button. The instrument’s battery voltage is displayed.
Ensure this is above 6.6V.

5. Turn the rotary switch to an insulation voltage setting (§3.7), and check a known resistor that is within the
measurement range for the test voltage selected.

6. When all the steps above produce expected results, you can start using the instrument.

3.3 Power Supply and Battery Life

The power supply is six 1.5V alkaline batteries (type AA or LR6). Nominal voltage is 6.6 to 9.6V. Below 6.6V the instrument
will not turn on.

■ Battery life for insulation measurements: Average battery life for insulation measurement (according to
IEC61557-2 clause 6.7) is 2000 measurements with new batteries at room temperature (5s ON, 25s OFF).

■ Battery life for voltage and resistance measurements: Average battery life for voltage and resistance with
new batteries at room temperature @ 400kΩ is > 300h.

■ Battery life for continuity checking: Average battery life for continuity checking (according to IEC 61557-4
clause 6.6) is > 6000 measurements with new batteries at room temperature (5s ON, 25s OFF). For shorter
continuity tests (0.8s ON, 10s OFF) battery life is > 40,000 tests.

■ Battery voltage: To check the battery voltage, press and hold the TEST button with the switch set to the V position.

14

Megohmmeter Models 6528/6529

3.4 Stand, Door or Magnetic Mount



For convenience, the instrument can be used in
different positions:

■ With the stand - simply pull the back stand
down to free it from its slot, then fold it and
insert the end in the upper available slot.

■ The stand can be placed on the top of a door
or other similar surface by positioning the stand
over the top edge as shown.

■ The stand is equipped with magnets allowing
the instrument to be attached to a metal surface.

3.5 AC+DC or DC Voltage

The instrument measures AC+DC or DC voltage, to minimize risk when measuring an unknown voltage.
Measure AC+DC voltage rst. Be sure to respect the rated voltage and category.

If the measurement departs from the measurement range, the instrument displays OL.

1. Turn the rotary switch to the V position.

2. Toggle between AC+DC or DC voltage measurement by pressing
the

3. Connect the red test lead to the + terminal and the black test
lead to the COM terminal.

4. Measure the voltage by attaching the test leads to the
desired test points of the circuit.

Note: When the rotary switch is set to V, you can display the
instrument’s battery voltage by pressing and holding down the
TEST key with no voltage present on the test leads. Releasing
the key returns to voltage measurement mode.

key.

AC

+

V

DC

V

DC

Toggle between
AC + DC and DC

Megohmmeter Models 6528/6529

15

3.5.1 Voltage Error Indicators

■ If the measurement is outside of the measurement range, the instrument displays OL.

3.6 Continuity

To avoid electrical shock and damage to the instrument when measuring resistance or continuity

in a circuit, ensure power to the circuit is turned OFF and all capacitors are discharged.

   The measurement can be a󰀨ected by (1) impedances of additional operating circuits connected in 

parallel, or (2) transient currents.

In Continuity mode the instrument outputs a current above 200mA @ 2Ω between the + and COM terminals. The voltage
across the circuit under test is measured by the instrument; this voltage is then used to calculate resistance (R = V/I).

1. Turn the rotary switch to

2. The continuity threshold can be either 1Ω or 2Ω. To change this, press SET-UP
setting. Press ▲ to change this, then press TEST to exit SET-UP

3. Connect the red test lead to the

4. To compensate leads see §3.6.1.

5. Check continuity by connecting the leads to the desired point of the circuit. If resistance is under the threshold, the
buzzer will sound, and
backlight will light up red, the buzzer won’t sound, and the LCD displays ×. The LCD displays the measured continuity
on its primary display and test current on the secondary display (§2.5). To activate the audible alarm signal, press
the
lets you check that the continuity

key. The symbol is displayed

Secondary Display

Ω.

for >2s. This displays the threshold

mode.

+

terminal and the black test lead to the COM terminal.

will display on the LCD designating a short circuit. If the resistance is above the threshold, the



and a beep is emitted when the measurement is below the threshold. This

measurement is OK just by listening, without looking at the display.

REL

%

Ω

REL

%

Ω

16

Primary Display

If you change the leads without redoing the compensation, the reading can become negative.

Megohmmeter Models 6528/6529

3.6.1 Compensation of the Measurement Leads

Ω

0

Ω

0

Short the input terminals by touching them together. Then press the

key and hold it down for >2s. The LCD should

display 0Ω. If current is 0 mA when the terminals are shorted, verify the fuse is good.

NOTE: If the resistance of the leads is >5Ω, compensation is not possible.

To remove test lead compensation, press
the alarm

key.

for >2s with the test leads open. The buzzer can be disabled by pressing

3.6.2 Continuity Alarm Indicators

■ The alarm is always active in continuity measurement.

■ The instrument gives you a choice of two alarm thresholds: 1Ω or 2Ω.

■ If the measurement is below the threshold, the

■ If the measurement exceeds the threshold, the backlighting lights turn red and the

symbol is displayed.



symbol is displayed.

×

3.6.3 Continuity Error Indicators

■ If the measurement is beyond the measurement range, the instrument displays >42.00Ω.

■ If during the measurement the

measurement. Ensure the circuit under measurement is de-energized.

■ When the measurement current is <200mA, the measurement is still correct but is no longer compliant with the
IEC standard continuity measurements.

■ The instrument displays the AC+DC voltage. If it is >30V, the
voltage on the terminals is hazardous and the instrument emits a pulsed beep.

■ If there is a voltage of more than 0.4V on the object to be tested, the instrument displays .

symbol appears on the LCD, transient currents are affecting the

symbol is displayed to warn the user that the

3.7 Resistance

To perform a resistance test, the instrument outputs a DC voltage and measures the current across the circuit under test.
The instrument then calculates the resistance.

To avoid electrical shock and damage to the instrument when measuring resistance or continuity in a circuit,

ensure power to the circuit is turned OFF and all capacitors are discharged.

3.7.1 Differential Mode Resistance (DRM) Mode

In the resistance measurement mode, there is a very useful feature called the Differential Resistance Mode (DRM). It can
be used as an incoming inspection tool, a radiant heat element qualifying tool or a quality check on production lines to
name a few.

This is a valuable feature to compare successive measurements to a previously
measured
threshold percentage

Start by setting the threshold in %

1. Turn the rotary switch to the kΩ position.

2. Press and hold the SET-UP

“reference” resistance. If the measurement falls outside a congured

, a visual and audible alarm will occur.

key for >2s. The threshold percentage

appears in the LCD secondary display area, with the rst digit blinking.

kΩ

V

OFF

Ω

250 V

500

1000 V

MΩ

V

3. You can adjust the percentage by pressing the ▲ to increment the blinking
digit and the ► to advance to the next digit.

Megohmmeter Models 6528/6529

6528 rotary switch shown

17

4. The threshold percentage can be set from 0.1% to 399.9%; default is 5%.
When nished setting the threshold percentage, press TEST to exit SET-UP mode.

5. Connect the red lead to the + terminal and the black lead to the COM terminal.

6. Connect the test leads to the device to be used as the reference resistance.
The resistance measurement will appear in the primary display area.

7. Press the TEST button to accept that as the reference value. The ΔRel
symbol will appear and the percentage
of the secondary display indicating the instrument is in DRM mode.

As you take subsequent measurements, the difference between the measurement
and the reference is displayed both in ohms (primary display (§2.5)) and as a
percentage (secondary display (§2.5)).

If the difference exceeds the threshold percentage, an alarm activates with a red
back lit display and an audible buzzer (if enabled) indicating the out of tolerance
condition.

difference will appear on the top line

DRM
Mode

REL

%

M

%

Ω

Ω

3.7.2 Resistance Mode Alarm Indicators

■ Before starting an insulation measurement, pressing the key
activates the alarm. The alarm threshold is displayed, along with the

and symbols.

■ If the measurement exceeds the threshold, the

■ If the measurement is below the threshold, the instrument emits a
continuous beep, the backlight turns red and the

symbol is displayed.



symbol is displayed.

×

REL

%

3.7.3 Resistance Mode Error Indicators

■ If there is a voltage of more than 0.4V on the object to be tested, the instrument displays .

■ If the object to be tested is at a hazardous voltage, >30V, the symbol is displayed and the instrument emits a
pulsed beep.

■ If the measurement is outside of the measurement range, the instrument displays >420.0kΩ.

3.8 Insulation Resistance Tests

To avoid electrical shock and damage to the instrument when measuring resistance or continuity

in a circuit, ensure power to the circuit is turned OFF and all capacitors are discharged.

In Insulation Resistance mode the instrument outputs a DC voltage. This voltage depends on the resistance to be
measured. The device measures the voltage and current present between the two terminals and determines the value of
R=V/I.

Ω

You can perform up to ve types of resistance tests, depending on instrument model. By default, the instrument is in
“unlocked” untimed test mode. In this mode, the test begins when you press the TEST button, and ends when you release
it. This mode is typically used to run short “spot” tests.

18

Megohmmeter Models 6528/6529

The other test types are selected via the SET-UP



key:

KEY

1st press

2nd press

3rd press

Exit
PI

KEY

4th press DAR

5th press TEST

DESCRIPTION

Lock the TEST button. In this mode, after you start the measurement, it continues without
requiring you to keep the TEST button pressed. The test will run until you stop it, or when 40
minutes have passed.

Activate timed test mode. You can set the test duration between 1 second and 39:59 minutes.

Exit timed text mode (Model 6528).

Enable the PI function (Model 6529). This is used to calculate the polarization index (the ratio of
the measurement at T2 [default 10 minutes] to the measurement at T1 [default 1 minute]).

DESCRIPTION

Enable the DAR function (Model 6529). This is used to calculate the dielectric absorption ratio (the
ratio of the measurement at T2 [default 1 minute] to the measurement at T1 [default 30 seconds]).

Exit timed test mode (Model 6529).

3.8.1 Untimed Test (Including Unlocked and Locked)

1. Turn the rotary switch to an insulation voltage setting, Choices are 250 V, 500 V, 1000 V (available on both the Models
6528 and 6529), and 50 V and 100 V (available on Model 6529 only). The test voltage to select depends on the operating
voltage of the device to be tested.

2. To run an unlocked test, skip this step and continue with step 3. To lock the TEST button, press the SET-UP key

once. The icon appears on the LCD.

3. To set an Alarm (§2.12).

4. Use the leads to connect the system to be tested to the instrument’s terminals. The test sample must be powered
down and discharged. When testing insulation, the typical connection is negative (black) lead to conductor and positive
(red) lead to ground or the outer insulation of the test sample.

5. Press the TEST button to start the test.

If you are running an unlocked test, hold down the TEST button until the displayed measurement is stable.

If you are running a

Note that if the instrument detects a voltage greater than 30V in the system under test, pressing the TEST button

has no effect because the test will be prohibited.

When the insulation measurement stabilizes, it appears on the primary display (§2.5). The secondary display

(§2.5) shows the test voltage.

V

Ω

kΩ

test, release the TEST button.

OFF

250 V

500

1000 V

MΩ

V

V

Megohmmeter Models 6528/6529

6528 rotary switch shown

MΩ

19

6. When performing insulation measurement, you can press the key to enable the alarm feature. If the
measurement falls below the alarm threshold, the alarm will activate. To set alarm threshold (§2.12).

7. At the end of the test, either release the TEST button (for unlocked tests) or press the TEST button a second time

(for

tests). The instrument stops generating the test voltage and discharges the device being tested. During this
process the discharging voltage value is displayed to indicate residual voltage. The measured value will remain on the
display until you make another measurement, press the HOLD key, or turn OFF the instrument. You can also start
another measurement immediately by a long press on the TEST button.

MEGOHMMETER

MODEL 6528

P

V

Press TEST to start
measurement

HOLD

V

Ω

kΩ

600 V CAT IV

OFF

Ω

FUSED

700 V

max

SET-UP

MΩ

Ω

0

250V

500

1000V

MΩ

Timer

V

Model 6528 shown

Do not disconnect the instrument while the

symbol is still displayed.

3.8.2 Timed Test (Including PI and DAR)

Both the Model 6528 and Model 6529 can perform timed tests that stop automatically after a dened duration. In addition,
the Model 6529 can perform polarization index (PI) and dielectric absorption ratio (DAR) tests.

Polarization index is a useful indicator of motor insulation health. It can identify the accumulation of contaminants as well
as any physical damage to the insulation itself. The test involves applying a positive charge to a motor’s conductors and
a negative charge to the motor frame therefore polarizing the insulation. This test essentially measures the change over
time. Healthy clean insulation will charge over time resulting in the decrease of induced current and an increase in insulation
resistance. Unhealthy insulation will result in a at to decreasing insulation resistance over time.

The PI test compares the measurement of insulation resistance at two points in time. The most prominent used time points
are at 1 and 10 minutes. Model 6529 defaults to these two test points labeled as T1 and T2. The instrument allows user
programming of both time points if necessary. Acceptable values can be programmed between 1 second and 30 minutes
for each test point. The time for T2 must be at least 1 second longer than T1.

The polarization index is calculated by dividing the insulation resistance value at point in time T2 (e.g., 10-min) by the
insulation resistance value taken at point in time T1 (e.g., 1-min).

20

Megohmmeter Models 6528/6529

IEEE-43 recommends that good insulation will exhibit an increase in resistance at the 10-minute point that should be at
least two times greater than the measurement taken at the one-minute point. Therefore, healthy insulation will exhibit a PI
ratio of 2 or higher. Newer insulation material can progress through the absorption phase very quickly and therefore display
a PI ratio of 1.

3.8.2.1 Conducting a Polarization Index (PI) Test (Model 6529)

1. Select the desired insulation resistance test voltage using the rotary switch.

2. Turn the rotary switch to an insulation voltage setting. Choices are 50V, 100V, 250V, 500V, and 1000V. The test voltage
to select depends on the voltage of the installation to be tested.

3. Press the SET-UP

key three times until you see PI on the secondary display (§2.5) along with the test run time.

4. Press and hold the TEST button until the test begins.

5. The secondary display will then indicate a countdown timer showing the remaining time to complete the test. The
primary display (§2.5) will show a real time value of the insulation resistance measurement in progress.

6. At the conclusion of the test the secondary display will show PI and the elapsed test time.

7. The primary display will show the PI ratio.

PI

PI

M

Ω

PI

3.8.2.2 Programming the Polarization Index T1 and T2 Test Time Points

1. Select the desired insulation resistance test voltage using the rotary switch.

2. Press the SET-UP

key three times until you see PI on the top line of secondary

display along with the test run time.

3. Press and hold the SET-UP

key >2s until the Alarm threshold is shown. Press

SET-UP key again until T1 appears and the leading time digit begins to blink. You can
adjust the time for T1 by using the ▲  to increment the blinking digit and ► to advance
to the next digit.

4. Once completed press the SET-UP

key again.

5. The time T2 time will now appear in the display with the rst digit blinking repeat the
▲ and ► arrow sequence to adjust the desired time for T2.

6. Press the test button TEST button to lock-in the new times for T1 and T2.

Megohmmeter Models 6528/6529

PI

PI

T1

T2

21

3.8.2.3 Conducting a Dielectric Absorption Ratio (DAR) Test

The dielectric absorption ratio test is typically accomplished by measuring the
insulation
insulation resistance

resistance taken at the 30 second time interval and comparing it to the

measurement at the 60 second time interval. The instrument

allows user programming of both time points if necessary.

As with the PI ratio, these two time points are labeled T1 and T2.

The DAR ratio is then calculated by dividing the T2 measurement (e.g., 60 seconds)
by the T1 measurement (e.g., 30 seconds).

Generally, ratios of 1.25 or less are considered questionable. Ratios between

1.25 and 1.6 are considered acceptable and ratios higher than 1.6 are considered

good.

1. Turn the rotary switch to an insulation voltage setting. Choices are 250 V, 500
V, 1000 V (available on both the Models 6528 and 6529) and 50 V and 100 V
(available on the Model 6529 only). The test voltage to select depends on the
voltage of the installation to be tested.

DAR

DAR

2. Press the SET-UP

key four times until you see DAR in the secondary

display along with the test run time.

3. Press and hold the TEST button until the test begins.

The top line of the secondary display will indicate a countdown timer showing the
remaining time to complete the test. The bottom primary display will show a real
time value of the insulation resistance measurement in progress.

At the conclusion of the test the secondary display will show DAR and the elapsed
test time.

The bottom primary display will show the DAR ratio.

3.8.2.4 Programming DAR the T1 and T2 test time points

The instrument allows for user programming both time points if necessary.
Acceptable

values can be programmed between 1 second and 30 minutes for

each test point. The time for T2 must at least 1 second longer than T1.

1. Select the desired insulation resistance test voltage using the rotary switch.

2. Press the SET-UP key four times until you see DAR on the top line of
display along with the test run time.

DAR

T1

3. Press and hold the SET-UP
Press SET-UP key again until T1 appears and the leading time digit
to blink. You can adjust the time for T1 by using the ▲ arrow to increment

key >2s until the Alarm threshold is shown.

begins

the

blinking digit and the ► arrow to advance to the next digit.

4. Once completed press the SET-UP

key again.

5. The time T2 will now appear in the secondary display with the rst digit blinking;
repeat the ▲ and ► arrow sequence to adjust the desired time for T2.

6. Press the TEST button to lock-in the new times for T1 and T2.

22

DAR

Megohmmeter Models 6528/6529

T2

3.8.2.5 Performing a Timed Test



SET-UP



SET-UP



SET-UP









SET-UP

1. Turn the rotary switch to an insulation voltage setting. Choices are 250V, 500V, 1000V (available on both the Models
6528 and 6529), and 50V and 100V (available on the Model 6529 only). The test voltage to select depends on the voltage
of the installation to be tested.

2. Press the SET-UP key two times to enter duration mode.

V

OFF

Ω

kΩ

6528 rotary switch shown

3. To set an Alarm, see §2.12

4. Press and hold the SET-UP
timer duration, with the leading time digit blinking. You can adjust the duration by using the ▲ arrow to increment the
blinking digit and the ► arrow to advance to the next digit.

>2s

250 V

500

V

1000 V

MΩ

key >2s until the Alarm threshold is shown. Press SET-UP key again to display

HOLD

5. The insulation measurement time of duration can be programmed from 00:01 to 39:59 (from 1 second to 40 minutes)
in the duration mode .

6. Press the TEST button to lock-in the new time duration for a timed test.

7. In the Timed Test
automatically at the end of the programmed duration.

3.8.2.6 Insulation Resistance Mode Error Indicators

■ The instrument displays the AC+DC voltage. If it is >30V, the symbol is displayed to warn the user that the
voltage on the terminals is hazardous, the instrument emits a pulsed beep and pressing the TEST button is
restricted from performing a test.

■ If the measurement is outside of the measurement range, the instrument displays LO (if the insulation resistance
is too low to allow generation of the voltage) or >4200MΩ (for a test voltage of 50V,* 100V*, 250V or 500V) or
>11.00GΩ (for a test voltage of 1000V). (*Model 6529 only.)

■ If the instrument fails to generate a voltage, check the fuse (§4.3).

Megohmmeter Models 6528/6529

mode, simply long-press the TEST button to start the timed measurement. Test will stop

23

4. MAINTENANCE

The instrument has no parts that can be replaced by personnel who are not trained and approved. Any non-approved
repair or other work, or replacement of a part by an “equivalent,” may severely compromise safety.

4.1 Cleaning

Periodically wipe the case with a damp cloth and mild detergent. Do not use abrasives or solvents. Dirt or moisture in the
terminals can affect the readings. Dry the instrument thoroughly after cleaning and before use.

4.2 200mA Fuse Test

To avoid electrical shock, remove the test leads and any input signals before replacing the fuse.

1. Turn the rotary switch to

2. Short circuit both terminals.

3. If the current measurement is 0, the fuse needs to be replaced.

Ω.

4.3 Battery and Fuse Replacement

To avoid false readings, which could lead to possible electric shock or personal injury, replace the batteries
with LR6 batteries as soon as the battery indicator appears. To prevent damage or injury, install
ONLY replacement fuses with the specied amperage, voltage, and interrupt ratings. Disconnect test leads
before removing the battery cover.

Replace the batteries and fuse as follows:

1. Using a Phillips screw driver, remove the battery cover screw on the back of
the instrument.

2. Remove the old batteries.

3. Install the batteries, respecting polarity.

4. Locate the fuse in its slot near the base of the instrument (indicated by the red
square in the illustration to the right).

5. Using a thin athead screwdriver or similar implement, carefully remove the
fuse.

6. Insert the replacement fuse (Fast Fuse 200mA 1000V 10kA size: 6.3 x 32mm),
ensuring both ends are rmly pressed into the fuse holding clips.

7. Replace battery door and tighten the screw.

24

Megohmmeter Models 6528/6529

5. GENERAL SPECIFICATIONS

I

S

T

E

USC

Maximum Voltage applied to terminals 700VRMS or DC

Storage temperature -40 to 140°F (-40 to 60°C)

Operating temperature 14 to 122°F (-10 to 50°C)

Temperature coefficient

Relative humidity 10% to 90%

Operating Altitude 0 to ~6500’ (0 to 2000m)

Electromagnetic compatibility EN 61326-1, EN 61326-2-2

Insulation 4000PPM/°C, Ohm/Cont 2%/10°C+2D, V

0.3%/10°C+D

Safety

600V CAT IV, IEC 61010-2-034, IEC 61010-031,

L

Battery type 6x AA, NEDA 15A, IEC LR6

Battery life See §3.3

Size (H x W x L) 8.54 x 3.54 x 2.44” (217 x 90 x 62mm)

Vibration 1mm 25Hz as per IEC61557

Weight 1.68 lbs (760g)

Conformity CE, IEC61557-2, IEC61557-4, IEC61557-10

IP40 with test leads connected: EN60529

Mechanical conformity

IP20 without test leads connected: EN60529

Drop test according to IEC61010-1

Shock 0.5 J (IK04): IEC 68-2-27

Fuse F1: Fast Fuse 200mA 1000V 10kA size : 6.3 x 32

®

D

Megohmmeter Models 6528/6529

25

6. ELECTRICAL SPECIFICATIONS

6.1 General Condition of Reference

Influencing Quantity Conditions of Reference

Ambient temperature 73.4°F ± 5.4°F (23°C ± 3°C)

Relative humidity [45%; 75%]

Electric eld ≤ 0.1V/m AC

Power supply (batteries voltage) 8 to 9V

6.2 AC/DC Voltage Measurement

Range Resolution

AC+DC 700V 1V ±(1.2%+1ct)

V

DC 700V 1V ±(1%+1ct)

V

Input impedance: 25MΩ

Common Mode Rejection Ratio: > 60dB

Overload protection: 700VRMS or DC

Frequency: 30 to 440Hz

6.3 Ground Bond Continuity Measurement

Range Resolution

Continuity 40Ω 0.01Ω ±(1.2%+3cts)

Resistance of test leads: ≤ 0.01Ω (compensated)

Overload fuse protection by fuse: 700VRMS

Open circuit voltage: >6V and <9V

Short circuit current:

0.02-2.00Ω: ≥ 200mA

2.01-39.99Ω: between 100-200mA

Uncertainty

±(% of reading +Digits)

Uncertainty

±(% of reading +Digits)

6.4 Ground Bond Resistance Measurement

Range Resolution

400Ω 0.1Ω

kΩ

Resistance of test leads: ≤ 0.01Ω (compensated)

Overload fuse protection by fuse: 700VRMS

Open circuit voltage: 4.5V

26

4kΩ 1Ω

40kΩ 10Ω

400kΩ 100Ω

Uncertainty

±(% of reading +Digits)

±(1.2%+3cts)

Megohmmeter Models 6528/6529

6.5 Insulation Resistance Specification

Measurement range: 0.01MΩ to 10GΩ

Test voltages:

Model 6529: 50, 100, 250, 500, 1000V
Model 6528: 250, 500, 1000V

Test voltage accuracy: +25%, 0%

Nominal current: 1mA

Auto discharge: Discharge time 2s for C=2µF

Live circuit detection: Inhibit test if terminal voltage >30V prior to initialization of test

Maximum capacitive load: 2µF at nominal voltage and nominal current.

Output Voltage Range Display Range Resolution Test current

4MΩ 0.01 to 4.000MΩ 0.001MΩ

50V*

(0% to +25%)

40MΩ 3.60 to 39.99MΩ 0.01MΩ

1mA @ 50kΩ

400MΩ 36.0 to 399.9MΩ 0.1MΩ

0.020 to

4.000MΩ

0.001MΩ
1mA @ 100kΩ

100V*

(0% to +25%)

4MΩ

40MΩ 3.60 to 39.99MΩ 0.01MΩ

400MΩ 36.0 to 399.9MΩ 0.1MΩ

0.050 to

3.999MΩ

0.001MΩ

1mA @ 250kΩ

250V

(0% to +25%)

4MΩ

40MΩ 3.60 to 39.99MΩ 0.01MΩ

400MΩ 36.0 to 399.9MΩ 0.1MΩ

4GΩ 360 to 3,999MΩ 1MΩ ±(4%+10cts)

0.100 to

3.999MΩ

0.001MΩ

1mA @ 500kΩ

500V

(0% to +25%)

4MΩ

40MΩ 3.60 to 39.99MΩ 0.01MΩ

400MΩ 36.0 to 399.9MΩ 0.1MΩ

4GΩ 360 to 3,999MΩ 1MΩ ±(4%+10cts)

40MΩ 0.20 to 39.99MΩ 0.01MΩ

1000V

(0% to +25%)

400MΩ 36.0 to 399.9MΩ 0.1MΩ

4GΩ 360 to 3,999MΩ 1MΩ ±(4%+5cts)

1mA @ 1MΩ

10GΩ 3.60 to 9.99GΩ .01GΩ ±(10%+10cts)

* Model 6529 only

Uncertainty

±(% of reading

+ Digits)

±(3%+10cts)

±(1.5%+10cts)

±(1.5%+10cts)

±(1.5%+10cts)

Capacitance in parallel: <1nF

External voltage in series: 0.0V

Common mode voltage: 0.0V

Megohmmeter Models 6528/6529

27

7. REPAIR AND CALIBRATION

To ensure that your instrument meets factory specications, we recommend that it be scheduled back to our factory
Service Center at one-year intervals for recalibration, or as required by other standards or internal procedures. For
instrument repair and calibration:

You must contact our Service Center for a Customer Service Authorization Number (CSA#). This will ensure that when
your instrument arrives, it will be tracked and processed promptly. Please write the CSA# on the outside of the shipping
container. If the instrument is returned for calibration, we need to know if you want a standard calibration, or a calibration
traceable to N.I.S.T. (Includes calibration certicate plus recorded calibration data).

Ship To: Chauvin Arnoux

15 Faraday Drive • Dover, NH 03820 USA
Phone: [phone] (Ext. 360)
[phone] (Ext. 360)
Fax: [phone] or [phone]
E-mail: [e-mail] (Or contact your authorized distributor)

Costs for repair, standard calibration, and calibration traceable to N.I.S.T. are available.

NOTE: You must obtain a CSA# before returning any instrument.

®

, Inc. d.b.a. AEMC® Instruments

8. TECHNICAL AND SALES ASSISTANCE

If you are experiencing any technical problems, or require any assistance with the proper operation or application of your
instrument, please call, fax, or e-mail our technical support team:

Chauvin Arnoux

Phone: [phone]
[phone]

Fax: [phone]
E-mail: [e-mail]

®

, Inc. d.b.a. AEMC® Instruments

28

Megohmmeter Models 6528/6529

9. LIMITED WARRANTY

The instrument is warranted to the owner for a period of two years from the date of original purchase against defects in
manufacturing. This limited warranty is given by AEMC® Instruments, not by the distributor from whom it was purchased.
This warranty is void if the instrument has been tampered with, abused, or if the defect is related to service not performed
by AEMC® Instruments.

The warranty does not apply in the following cases:

■ Inappr

■ Modications made to the equipment without the explicit permission of the manufactur

opriate use of the equipment or use with incompatible equipment

er’s technical staff

■ Work done on the device by a person not approved by the manufacturer

■ Adaptation to a particular application not anticipated in the denition of the equipment or not indicated in this user’s manual

■ Damage caused by shocks, falls, or oods

Full warranty coverage and product registration is available on our website at: www.aemc.com/warranty.html

Please print the online Warranty Coverage Information for your records.

®

What AEMC

Instruments will do:

If a malfunction occurs within the warranty period, you may return the instrument to us for repair, provided we have your
warranty registration information on le or a proof of purchase. AEMC

®

Instruments will, at its option, repair or replace the

faulty material.

Megohmmeter Models 6528/6529

29

10/20

99-MAN 100491 v1

Test Equipment Depot - 800.517.8431 - 5 Commonwealth Ave, MA 01801

TestEquipmentDepot.com