AEMC Megohmmeter 6528/6529 User Manual

User Manual for AEMC models including: AEMC, Megohmmeter, 6528, 6529, True Megohmmeter

Megohmmeter Models 6528 and 6529 - AEMC

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 incorrectly closed. Before each use, check the condition of the cable insulation, the instrument, and its accessories.

6528 6529 - AEMC Instruments

This documentation is provided “as is,” without warranty of any kind, express, implied, or otherwise. Chauvin Arnoux , Inc. has made every reasonable effort ...

Models 6528 & 6529 - English

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6528-6529 EN

Megohmmeter Models 6528 and 6529

True Megohmmeter®

User Manual
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®, Inc., as governed by United States and International copyright laws.
Chauvin Arnoux®, Inc. d.b.a. AEMC® Instruments 15 Faraday Drive · Dover, NH 03820 USA Tel: (800) 945-2362 or (603) 749-6434 · Fax: (603) 742-2346
This documentation is provided "as is," without warranty of any kind, express, implied, or otherwise. Chauvin Arnoux®, Inc. has made every reasonable 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 not limited to) physical, emotional or monetary damages due to lost revenues or lost profits 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.

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. Refer to our repair and calibration section at www.aemc.com.
Serial #: ______________________________ Catalog #: 2126.54 / 2126.55 Model #: 6528 / 6529
Please fill in the appropriate date as indicated:
Date Received: _________________________ Date Calibration Due: ____________________
Chauvin Arnoux®, Inc. d.b.a AEMC® Instruments
www.aemc.com

MEASUREMENT CATEGORIES
Thank you for purchasing the True Megohmmeter® Model 6528 or 6529. For best results with your instrument:
Read this user manual carefully Respect precautions for use

AC - Alternating current AC or DC
Shock Hazard
Battery
Instrument follows recycling directives Sorting for the recycling of electric and electronic waste
Danger Hazard

DC - Direct Current Double insulated Fuse Instructions that must be read and understood Comply with US directives
Earth Ground
Voltage on the instrument 770 V should not exceed 770VRMS

Definition of Measurement Categories (CAT)
CAT IV: Test and measurement circuits connected to the source of the building's low-voltage network installation.
Example: Measurement on equipment installed upstream of the main fuse or building installation cut-off switch.

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 fixed installation and industrial instruments and other equipment such as motors permanently connected to the fixed 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.

Megohmmeter Models 6528/6529

PRECAUTIONS FOR USE
Failure to comply with safety instructions can create a risk of electric shock, fire, explosion and destruction of the instrument or the installations. If the instrument is used other than as specified 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 inflammable 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 incorrectly closed.

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
repair or disposed as waste.

Use cables and accessories for voltage according to IEC 61010-031 and measurement categories at least equal to 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 environmental conditions of use.
Strictly comply with the fuse specifications. Disconnect all cables before opening the fuse access cover.

Do not modify the instrument, and, do not replace components using equivalent parts. Repairs and adjustments must be performed by qualified, 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 fingers away from the unused instrument terminals. When handling sensors or test probes, do not place fingers beyond the physical finger guard.

Megohmmeter Models 6528/6529

TABLE OF CONTENTS
1. INTRODUCTION............................................................................................... 7
1.1 Receiving Your Shipment................................................................................................................... 7 1.2 Ordering Information .......................................................................................................................... 7 1.3 Accessories........................................................................................................................................ 8 1.4 Replacement Parts ............................................................................................................................ 8
2. OVERVIEW ...................................................................................................... 8
2.1 Description ......................................................................................................................................... 8 2.2 Insulation Resistance Testing Principal of Operation ......................................................................... 9 2.3 Megohmmeter Models 6528 & 6529 -- Front View ........................................................................... 9 2.4 TEST Button and Function Keys...................................................................................................... 10 2.5 Instrument Display ........................................................................................................................... 10 2.6 Terminals...........................................................................................................................................11 2.7 ConfigurationMode...........................................................................................................................11 2.8 Alarm Buzzer ................................................................................................................................... 12 2.9 Permanent Mode ............................................................................................................................. 12 2.10 Backlight (BL) ................................................................................................................................. 12 2.11 Firmware Version............................................................................................................................ 12 2.12 Alarm Functions and Indicators ...................................................................................................... 12
3. OPERATION ................................................................................................... 14
3.1 Battery Installation ........................................................................................................................... 14 3.2 Instrument Check............................................................................................................................. 14 3.3 Power Supply and Battery Life......................................................................................................... 14 3.4 Stand, Door or Magnetic Mount ....................................................................................................... 15 3.5 AC+DC or DC Voltage ..................................................................................................................... 15 3.6 Continuity ......................................................................................................................................... 16 3.7 Resistance ....................................................................................................................................... 17 3.8 Insulation Resistance Tests.............................................................................................................. 18
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 6.4 Ground Bond Resistance Measurement.......................................................................................... 26 6.5 InsulationResistanceSpecification ................................................................................................ 27
7. REPAIR AND CALIBRATION ........................................................................... 28
8. TECHNICAL AND SALES ASSISTANCE .......................................................... 28
9. LIMITED WARRANTY..................................................................................... 29

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, file 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) color-coded 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

(1) 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
Also includes 6 AA batteries and a user manual.

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

Megohmmeter Models 6528/6529

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:

Insulation test voltages Insulation Resistance PI and DAR ratios calculation Continuity measurement Resistance measurement Programmable alarms

Model 6528
250, 500, and 1000V

Model 6529
50, 100, 250, 500, and 1000V

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 flowing, the instrument can determine the value of the resistance. In principle, the value of the insulation resistance is very high, but not infinite. Therefore, by measuring the low current flowing, the instrument indicates the insulation resistance value, providing a result in k, M, or G. 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

MEGOHMMETER MODEL 6528

REL
0

P
V% mA

AC
V+ DC
k G M
NOISE

Backlit LCD display unit
TEST button

HOLD

SET-UP

OFF

250 V

500 V

1000 V

600 V CAT IV

FUSED
700 V max

Four Function Keys
Test Modes Six (Model 6528) Eight (Model 6529)
Fused Test Lead Terminals

MEGOHMMETER MODEL 6529

HOLD REL
0
PI DAR

P
V% mA
AC
V+ DC
k G M
NOISE

HOLD
OFF V k

600 V CAT IV

FUSED
700 V max

SET-UP
0
50 V 100 V 250 V 500 V 1000 V
M

Megohmmeter Models 6528/6529

2.4 TEST Button and Function Keys
2.4.1 TEST Button
Pressing the TEST button starts an insulation measurement. It also serves to confirm 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

DESCRIPTION

HOLD

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

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

0
SET-UP

(short press <2s) Activate/deactivate backlight (§2.10)

(long press >2s) Perform lead compensation for continuity checks (§3.6.1)

SET-UP (long >2s press): configure settings (§2.7) (short press <2s): select type of insulation test ( , , PI, DAR (Model
6529)) (§3.8)

Navigate the configuration menu (§2.7)

2.5 Instrument Display
1. Indicates the measurement is on hold.
2. Indicates the Differential 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-off 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.

1
HOLD
6

34 5

REL
0

P
V% mA

AC
V+ DC
k G M
NOISE

78 9

Secondary Display
Primary Display

Megohmmeter Models 6528/6529

2.6 Terminals

FUSED

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

700 V max

2.7 Configuration Mode

Configuration mode enables you to set several options for the instrument. To open configuration mode, turn the rotary switch to OFF. Then press and hold down the SET-UP key for >2s while turning the rotary switch to any position. The symbol ConF appears on the LCD.

OFF

250 V

500 V

1000 V

M >2s
SET-UP

6528 rotary switch shown

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

1st press on
2nd press on

Insulation test mode buzzer enabled/disabled (§2.8)
P
Permanent mode enabled/disabled (§2.9)
Backlighting enabled/disabled (§2.10)

3rd press on 4th press on

Firmware version number (display only, §2.11) Return to the first 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

2.8 Alarm Buzzer
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 configuration 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 configuration mode. 3. Press until P appears. If this is set to OFF, pressto select ON.
When you restart the instrument, the auto-off is deactivated and the P appears on the LCD indicating the Permanent mode is active.
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 key for >2s while turning the rotary switch to any position.
The LCD momentarily displays ConF to indicate the insturment is in configuration mode. 3. Press until appears. If this is set to OFF, press to select ON. The next time the instrument
is switched 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.
2.11 Firmware Version
To display the firmware 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 firmware version appears in the primary display.
2.12 Alarm Functions and Indicators

Megohmmeter Models 6528/6529

2.12.1 Alarm Functions
The alarm functions make it possible to rapidly confirm that the readings are OK, without looking at the display. You can adjust the alarm function default settings by adjusting the thresholds.

Function

Default Threshold Programmable Threshold

Insulation 50V*

50k

from 10k to 399.9M

Insulation 100V*

100k

from 20k to 399.9M

Insulation 250V There are 7 alarm thresholds:
Insulation 500V

250k 500k

from 50k to 3.999G from 100k to 3.999G

Insulation 1000V

1000k

from 200k to 9.99G

Continuity

1 or 2

Resistance DMR

from 0.1 to 3999.9%

* Model 6529 only

To program a threshold, set the switch to the desired function, long press the SET-UP key for >2s and release it when the beep sounds. The instrument displays the current threshold with the first 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. Confirm by pressing the TEST button.

OFF

250 V

500 V

1000 V

6528 rotary switch shown

>2s SET-UP

k
HOLD

To enable Alarm Mode, press the Alarm Buzzer

key. The symbols and are displayed.

× If the measurement is below the alarm threshold, the meter emits a continous beep, the backlighting
lights red and the symbol is displayed.

Megohmmeter Models 6528/6529

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 six 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 first 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 >42.0 with no input connected.
Then short circuit both terminals, the display should show 0. 3. Turn the rotary switch to V, check a known voltage (e.g., 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 @ 400k 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.

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 first. 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

key.

V+ DC

V DC

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.

Toggle between AC + DC and DC

Megohmmeter Models 6528/6529

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.

Themeasurementcanbeaffectedby(1)impedancesofadditionaloperatingcircuitsconnectedin parallel, or (2) transient currents.
In Continuity mode the instrument outputs a current above 200mA @ 2 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 1 or 2. To change this, press SET-UP for >2s. This displays the threshold setting. Press to change this, then press TEST to exit SET-UP mode.
3. Connect the red test lead to the + terminal and the black test lead to the COM terminal.
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 will display on the LCD designating a short circuit. If
× the resistance is above the threshold, the 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 key. The symbol is displayed and a beep is emitted when the measurement is below the threshold. This lets you check that the continuity measurement is OK just by listening, without looking at the display.

Secondary Display

REL
%

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
Short the input terminals by touching them together. Then press the 0 key and hold it down for >2s. The LCD should display 0. If current is 0 mA when the terminals are shorted, verify the fuse is good.

NOTE: If the resistance of the leads is >5, compensation is not possible.
To remove test lead compensation, press 0 for >2s with the test leads open. The buzzer can be

disabled by pressing the alarm

key.

3.6.2 Continuity Alarm Indicators

The alarm is always active in continuity measurement. The instrument gives you a choice of two alarm thresholds: 1 or 2.
If the measurement is below the threshold, the symbol is displayed.
× If the measurement exceeds the threshold, the backlighting lights turn red and the symbol is displayed.
3.6.3 Continuity Error Indicators

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

If during the measurement the

symbol appears on the LCD, transient currents are

affecting 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 symbol is displayed to warn the user that 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

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 "reference" resistance. If the measurement falls outside a configured threshold percentage, a visual and audible alarm will occur.
Start by setting the threshold in %
1. Turn the rotary switch to the k position.
2. Press and hold the SET-UP key for >2s. The threshold percentage appears in the LCD secondary display area, with the first digit blinking.
3. You can adjust the percentage by pressing the to increment the blinking digit and the to advance to the next digit.

OFF

250 V

500 V

1000 V

6528 rotary switch shown

Megohmmeter Models 6528/6529

4. The threshold percentage can be set from 0.1% to

399.9%; default is 5%. When finished 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 Rel symbol will appear and the percentage difference will appear on the top line 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.

DRM Mode

M
REL
%

REL
%

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
symbol is displayed.

If the measurement is below the threshold, the
× instrument emits a continuous beep, the backlight
turns red and the symbol is displayed.

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 instrument emits a pulsed beep.

symbol is displayed and the

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

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.

You can perform up to five 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.

Megohmmeter Models 6528/6529

The other test types are selected via the SET-UP key:

KEY

DESCRIPTION

1st press

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.

2nd press

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

3rd press
Exit
PI

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]).

KEY

DESCRIPTION

4th press DAR

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]).

5th press TEST 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 test, release the TEST button.
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.

OFF

250 V

500 V

1000 V

6528 rotary switch shown 19

Megohmmeter Models 6528/6529

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.

Press TEST to start measurement

MEGOHMMETER MODEL 6528 P V
M

HOLD

SET-UP

OFF

250 V

500 V

1000 V

600 V CAT IV

FUSED
700 V max

Timer

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 defined 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 flat 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).

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 the test run time.

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

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.

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 first 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

3.8.2.3 Conducting a Dielectric Absorption Ratio (DAR) Test

The dielectric absorption ratio test is typically accomplished by measuring the insulation resistance taken at the 30 second time interval and comparing it to the insulation resistance 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 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 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.

DAR DAR

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.

DAR

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.

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 arrow to increment the blinking digit and the

arrow to advance to the next digit.

DAR

4. Once completed press the SET-UP key again.
5. The time T2 will now appear in the secondary display with the first 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.

Megohmmeter Models 6528/6529

3.8.2.5 Performing a Timed Test

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.

OFF

V k

250 V 500 V 1000 V

SET-UP

6528 rotary switch shown

3. To set an Alarm, see §2.12
4. Press and hold the SET-UP key >2s until the Alarm threshold is shown. Press SET-UP key again to display 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
SET-UP

SET-UP

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 mode, simply long-press the TEST button to start the timed measurement. Test will stop 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 >4200M (for a test voltage of 50V,* 100V*, 250V or 500V) or >11.00G (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

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.
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 specified 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 right).
5. Using a thin flathead 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 firmly pressed into the fuse holding clips.
7. Replace battery door and tighten the screw.

Megohmmeter Models 6528/6529

5. GENERAL SPECIFICATIONS

Maximum Voltage applied to terminals Storage temperature Operating temperature Temperature coefficient Relative humidity Operating Altitude Electromagnetic compatibility

700VRMS or DC -40 to 140°F (-40 to 60°C) 14 to 122°F (-10 to 50°C) Insulation 4000PPM/°C, Ohm/Cont 2%/10°C+2D,
V 0.3%/10°C+D 10% to 90%
0 to ~6500' (0 to 2000m) EN 61326-1, EN 61326-2-2

Safety Battery type Battery life Size (H x W x L) Vibration Weight Conformity
Mechanical conformity
Fuse

®
600V CAT IV, IEC 61010-2-034, IEC 61010-031, C US LISTED 6x AA, NEDA 15A, IEC LR6
See §3.3
8.54 x 3.54 x 2.44" (217 x 90 x 62mm)
1mm 25Hz as per IEC61557
1.68 lbs (760g)
CE, IEC61557-2, IEC61557-4, IEC61557-10
IP40 with test leads connected: EN60529 IP20 without test leads connected: EN60529
Drop test according to IEC61010-1 Shock 0.5 J (IK04): IEC 68-2-27
F1: Fast Fuse 200mA 1000V 10kA size : 6.3 x 32

Megohmmeter Models 6528/6529

6. ELECTRICAL SPECIFICATIONS

6.1 General Condition of Reference

Influencing Quantity Ambient temperature Relative humidity Electric field
Power supply (batteries voltage)

Conditions of Reference 73.4°F ± 5.4°F (23°C ± 3°C)
[45%; 75%] 0.1V/m AC
8 to 9V

6.2 AC/DC Voltage Measurement

VAC+DC VDC

Range
700V 700V

Resolution
1V 1V

Uncertainty ±(% of reading +Digits)
±(1.2%+1ct) ±(1%+1ct)

Input impedance: Common mode rejection ratio: Overload protection: Frequency:

25M > 60dB 700VRMS or DC 30 to 440Hz

6.3 Ground Bond Continuity Measurement

Continuity

Range 40

Resolution 0.01

Uncertainty ±(% of reading +Digits)
±(1.2%+3cts)

Resistance of test leads:

0.01 (compensated)

Overload fuse protection by fuse: 700VRMS

Open circuit voltage:

>6V and <9V

Short circuit current:

0.02-2.00: 200mA 2.01-39.99: between 100-200mA

6.4 Ground Bond Resistance Measurement

Range

Resolution

Uncertainty ±(% of reading +Digits)

400

0.1

40k

±(1.2%+3cts)

400k

100

Resistance of test leads:

0.01 (compensated)

Overload fuse protection by fuse: 700VRMS

Open circuit voltage:

4.5V

Megohmmeter Models 6528/6529

6.5 Insulation Resistance Specification

Measurement range:

0.01M to 10G

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
50V* (0% to +25%)
100V* (0% to +25%)
250V (0% to +25%)
500V (0% to +25%)
1000V (0% to +25%)
* Model 6529 only

Range
4M 40M 400M 4M 40M 400M 4M 40M 400M 4G 4M 40M 400M 4G 40M 400M 4G 10G

Display Range
0.01 to 4.000M
3.60 to 39.99M
36.0 to 399.9M 0.020 to 4.000M
3.60 to 39.99M
36.0 to 399.9M 0.050 to 3.999M
3.60 to 39.99M
36.0 to 399.9M
360 to 3,999M 0.100 to 3.999M
3.60 to 39.99M
36.0 to 399.9M
360 to 3,999M
0.20 to 39.99M
36.0 to 399.9M
360 to 3,999M 3.60to9.99G

Resolution
0.001M 0.01M 0.1M 0.001M 0.01M 0.1M 0.001M 0.01M 0.1M
1M 0.001M 0.01M
0.1M 1M 0.01M 0.1M 1M .01G

Uncertainty Test current ±(% of reading
+ Digits)

1mA@50k

1mA @ 100k

±(3%+10cts)

1mA @ 250k

±(1.5%+10cts)

±(4%+10cts)

1mA @ 500k

±(1.5%+10cts)

±(4%+10cts)

±(1.5%+10cts)

1mA@1M

±(4%+5cts)

±(10%+10cts)

Capacitance in parallel: <1nF External voltage in series: 0.0V Common mode voltage: 0.0V

Megohmmeter Models 6528/6529

7. REPAIR AND CALIBRATION
To ensure that your instrument meets factory specifications, 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 certificate plus recorded calibration data).
Ship To: Chauvin Arnoux®, Inc. d.b.a. AEMC® Instruments 15 Faraday Drive · Dover, NH 03820 USA Phone: (800) 945-2362 (Ext. 360) (603) 749-6434 (Ext. 360) Fax: (603) 742-2346 or (603) 749-6309 E-mail: repair@aemc.com (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.
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®, Inc. d.b.a. AEMC® Instruments Phone: (800) 343-1391
(508) 698-2115 Fax: (508) 698-2118 E-mail: techsupport@aemc.com

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: Inappropriate use of the equipment or use with incompatible equipment Modifications made to the equipment without the explicit permission of the manufacturer'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 definition of the equipment or not indicated in this user's manual Damage caused by shocks, falls, or floods
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 file or a proof of purchase. AEMC® Instruments will, at its option, repair or replace the faulty material.

Megohmmeter Models 6528/6529

NOTES:

Megohmmeter Models 6528/6529

NOTES:

Megohmmeter Models 6528/6529

10/20 99-MAN 100491 v1
Chauvin Arnoux®, Inc. d.b.a. AEMC® Instruments 15 Faraday Drive · Dover, NH 03820 USA
Phone: (603) 749-6434 · Fax: (603) 742-2346
www.aemc.com

References

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