AEMC Megohmmeters 6522 User manual

Megohmmeters
Model 6522 & 6524
CHAUVIN ARNOUX GROUP
®
ENGLISH
User Manual
99 Washington Street
Melrose, MA 02176
Phone [phone]
Toll Free 1-800-517-8431
Visit us at www.TestEquipmentDepot.com

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.
Serial #: ________________________________
Catalog #: 2155.51 / 2155.52
Model #: 6522 / 6524
Please fill in the appropriate date as indicated:
Date Received: _________________________________
Date Calibration Due: _______________________
Chauvin Arnoux®, Inc.
d.b.a AEMC®Instruments

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
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governed by United States and International copyright laws.
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Inc. has made every reasonable effort to ensure that this documentation is accurate; but does not warrant the accuracy or
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Chauvin Arnoux®, Inc and AEMC® are registered trademarks of AEMC®Instruments.

Thank you for purchasing the Megohmmeter Model 6522 or 6524.
For best results from your instrument:
■Read these operating instructions carefully
■Comply with the precautions for use
WARNING, risk of DANGER! The operator must refer to these
instructions whenever this danger symbol appears
WARNING, risk of electric shock. The voltage applied to parts
marked with this symbol may be hazardous
Equipment is protected by double insulation
> 700V The voltage on the terminals must not exceed 700V
Ground/Earth
Battery
Information or useful tip
Remote test probe
The product is recyclable in accordance with standard ISO14040
This instrument exceeds regulatory requirements with respect to
recycling and reuse
Indicates conformity with European directives, in particular LVD and
EMC
Indicates that, in the European Union, the instrument must undergo
selective disposal in compliance with Directive WEEE 2002/96/EC.
This instrument must not be treated as household waste
Denition of Measurement Categories (CAT)
■CAT II corresponds to measurements taken on circuits directly connected to
low-voltage installations.
Example: power supply to electro-domestic devices and portable tools.
■CAT III corresponds to measurements on building installations.
Example: distribution panel, circuit-breakers, machines or xed industrial
devices.
■CAT IV corresponds to measurements taken at the source of low-voltage
installations.
Example: power feeders and protection devices.

PRECAUTIONS FOR USE
This instrument is compliant with safety standard IEC 61010-2-030, and the leads
are compliant with IEC 61010-031, for voltages up to 600V in CAT IV or 1000V in
CAT III.
Failure to observe the following safety instructions may result in electric shock,
re, explosion, and damage to the instrument and installation.
■Carefully read and understand all precautions for use.
■Be aware of all electrical hazards when using this instrument.
■ Using this instrument other than as specied may compromise its user
protection features.
■The safety of any system in which this instrument is incorporated is the
responsibility of the integrator of the system.
■ This instrument can be used on CAT IV installations, for voltages
not exceeding 600VRMS with respect to ground or 700VRMS maximum
between terminals.
■Do not use the instrument on networks whose voltage or category
exceeds those specied in this manual.
■Observe all environmental conditions of use (see § 3).
■Except for voltage measurements, take no measurements on
electrically “live” systems.
■Do not use the instrument if it appears damaged, incomplete, or poorly
closed.
■Before each use, check the condition of the insulation on the leads,
housing, and accessories. Any part on which the insulation is
deteriorated (even partially) must be set aside for repair or scrapping.
■Using the instrument without its battery compartment cover may result
in electric shock to the user.
■Before using your instrument, ensure it is completely dry.
■Use only the leads and accessories supplied. The use of leads (or
other accessories) of a lower voltage rating or category limits the use
of the instrument/leads (or accessories) combination to the lowest
category and service voltage.
■When handling the leads, test probes, and alligator clips, keep your
ngers behind the physical guards.
■Before removing the battery compartment cover, ensure all
measurement leads and accessories are disconnected. Replace all
batteries at once. Use alkaline batteries.
■Use personal protection equipment where appropriate.
■All troubleshooting and metrological checks must be done by
competent, accredited personnel.

Table of Contents
1. INTRODUCTION .....................................................................4
1.1 Receiving Your Shipment......................................................................4
1.2 Accessories...........................................................................................5
1.3 Replacement Parts ...............................................................................5
1.4 Description............................................................................................5
1.4.1 Model 6522 (Front)...................................................................6
1.4.2 Model 6524 (Front)...................................................................7
1.5 Back of Instrument................................................................................8
1.6 Terminals ..............................................................................................9
1.7 Function Buttons...................................................................................9
1.8 LCD Display .......................................................................................10
2. OPERATION..........................................................................11
2.1 Setting Up the Instrument ...................................................................11
2.1.1 Conguration Settings ...........................................................11
2.1.2 Alarms.....................................................................................12
2.1.2.1 Activating/Deactivating the Alarm Function....................12
2.1.2.2 Setting an Alarm Threshold............................................13
2.1.2.3 Viewing Alarms ..............................................................14
2.1.3 ∆REL Function (Model 6524) .................................................15
2.1.4 HOLD Function.......................................................................16
2.1.5 Backlighting ............................................................................16
2.1.6 Standby Mode ........................................................................16
2.2 Taking Measurements.........................................................................17
2.2.1 Voltage Measurement.............................................................17
2.2.2 Insulation Measurement .........................................................18
2.2.2.1 TEST Button Operation..................................................20
2.2.2.2 Timed Tests ...................................................................21
2.2.2.3 Remote Control Probe (Optional) ..................................22
2.2.3 Continuity Measurement.........................................................23
2.2.3.1 Lead Compensation.......................................................23
2.2.3.2 Continuity Measuring .....................................................24
2.2.4 Resistance Measurement (Model 6524).................................25
2.3 Recording Data (Model 6524).............................................................26
2.3.1 Recording a Measurement .....................................................26
2.3.2 Viewing Stored Recordings ....................................................27

Megohmmeter Model 6522/6524 3
2.3.3 Deleting Recordings ...............................................................28
2.3.3.1 Deleting a Single Recording ..........................................28
2.3.3.2 Deleting All Recordings..................................................28
3. SPECIFICATIONS .................................................................29
3.1 General Reference Conditions ...........................................................29
3.2 Electrical Specications ......................................................................29
3.2.1 Voltage Measurement.............................................................29
3.2.2 Frequency Measurement........................................................30
3.2.3 Insulation Measurement .........................................................30
3.2.4 Continuity Measurement.........................................................32
3.2.5 Resistance Measurement (Model 6524).................................32
3.2.6 Timer.......................................................................................32
3.2.7 Storage Memory (Model 6524)...............................................33
3.3 Operating Environment.......................................................................33
3.3.1 Voltage Measurement.............................................................33
3.3.2 Insulation Measurement .........................................................34
3.3.3 Resistance and Continuity Measurement...............................35
3.3.4 Intrinsic Uncertainty and Operating Uncertainty.....................36
3.4 Power Supply......................................................................................36
3.5 Environmental Conditions...................................................................36
3.6 Mechanical Specications .................................................................37
3.7 Safety Standards ................................................................................37
4. MAINTENANCE & TROUBLESHOOTING ...............................38
4.1 Maintenance .......................................................................................38
4.1.1 Cleaning .................................................................................38
4.1.2 Replacing the Batteries ..........................................................38
4.2 Troubleshooting ..................................................................................40
4.2.1 Errors......................................................................................40
4.2.1.1 Voltage present before an insulation measurement.......40
4.2.1.2 Range exceeded during an insulation measurement.....40
4.2.1.3 Voltage during continuity/resistance/measurement .......41
4.2.1.4 Memory full (Model 6524) ..............................................41
4.2.2 Resetting the Instrument ........................................................41
4.3 Repair and Calibration ........................................................................42
4.4 Technical and Sales Assistance..........................................................42
4.5 Limited Warranty.................................................................................43
4.6 Warranty Repairs................................................................................43

1. INTRODUCTION
1.1 Receiving Your Shipment
Upon receiving your megohmmeter product package, ensure 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, providing a detailed description. Save the
damaged packing container to substantiate your claim.
Ordering Information:
Megohmmeter Model 6522.............................................................. Cat. #2155.51
Megohmmeter Model 6524.............................................................. Cat. #2155.52
Shipping Contents:
One of the following:
Megohmmeter Model 6522
or
Megohmmeter Model 6524
Two 1.5m test leads (red/black), two alligator clips
(red/black), 1 test probe (black)
Soft Carrying Case
Both models also include 6 AA batteries and a user manual.

Megohmmeter Model 6522/6524 5
1.2 Accessories
Megohmmeter Test Probe ................................................................Cat. #2155.75
Case - Field Case (Waterproof)........................................................ Cat. #2118.98
Case - Hands Free Carrying Case ................................................... Cat. #2118.99
Continuity Pole .................................................................................Cat. #2138.54
Probe - Set of 2, Color-coded (Red/Black) Grip Probes...................Cat. #2152.26
1.3 Replacement Parts
Lead - Set of 2, Color-coded 5 ft (Red/Black) Silicone Leads, Test Probes &
Alligator Clips {Rated 1000V CAT IV}...............................................Cat. #2152.05
1.4 Description
The Megohmmeters Models 6522 and 6524 are portable measuring instruments
with digital displays. They are powered by batteries. These instruments can
check the safety of electrical installations. For example, they can be used to test
new installations before they are powered up, check an existing installation in a
power-off condition, or troubleshoot an installation.
Features Include:
Model 6522 Model 6524
Insulation test voltages 250, 500, and
1000V
50, 100, 250, 500, and
1000V
PI and DAR ratios calculation 
Continuity measurement  
Resistance measurement 
Programmable alarms 
Frequency measurement 
Storage of the measurements 

6 Megohmmeter Model 6522/6524
1.4.1 Model 6522 (Front)
HOLD
SET-UP
0
V
OFF
Ω
250V
500V
1000V
MΩ
TEST
MEGOHMMETER
MODEL 6522
G
M
VDC
AC
k
M mAµA
G VHz
%
G
M
HOLD P
<
ALARM
1
2
3
4
5
Figure 1
1. Input terminals
2. Blue backlit LCD
3. Four function buttons (see § 1.7)
4. TEST button to start insulation measurements (see § 2.2.2.1)
5. Six-position rotary switch to choose the function or to turn the instrument
OFF

Megohmmeter Model 6522/6524 7
1.4.2 Model 6524 (Front)
HOLD
MEM
SET-UP
CLR
0
100V
V
kΩ
OFF
Ω
250V
500V
1000V
50V
MΩ
MR
MEGOHMMETER
MODEL 6524
TEST
REL
G
M
VDC
AC
k
<
>
ALARM
MEM
DARPI T1T2
k
M mAµA
G VHz
%
G
M
HOLD
REL
P
1
2
3
4
5
Figure 2
1. Input terminals
2. Blue backlit LCD
3. Six function buttons (see § 1.7)
4. TEST button to start insulation measurements (see § 2.2.2.1)
5. Ten-position rotary switch to choose the function or to turn the instrument
OFF

1.5 Back of Instrument
1
2
3
4
5
Figure 3
1. Captive quarter-turn screw
2. Battery compartment cover
3. Mounting magnets, molded into instrument case (Model 6524)
4. Non-skid pads
5. Stand

Megohmmeter Model 6522/6524 9
1.6 Terminals
> 700V
600V CAT IV
Figure 4
The instrument has one positive ( + ) terminal and one negative ( - ) terminal. The
negative terminal also supports the remote probe accessory (see § 2.2.2.3).
1.7 Function Buttons
In general, each button has two functions. One is marked on the button, and is
enabled via a short press. The second function is marked under the button, and
is enabled by a long (>2 seconds) press.
BUTTON DESCRIPTION
Selects the , , PI, and DAR functions (§ 2.2.2).
Toggles backlighting ON and OFF (§ 2.1.5).
HOLD Freezes/unfreezes the displayed measurement on the LCD (§
2.1.4).
SET-UP Accesses the instrument’s setup parameters and information (§
2.1.1).
0
Applies lead compensation in continuity testing (§ 2.2.3.1).
(Model 6524) Activates/deactivates alarms (§ 2.1.2).

Modify the display and program the durations of insulation
measurements (§ 2.2.2.2).
Choose the continuity test current (§ 2.2.3).
Program the alarm thresholds on the Model 6524 (§ 2.1.2).
∆Rel (Model 6524) Displays the difference between the present
measurement and a stored reference measurement (§ 2.1.3).
MEM (Model 6524) Records measurements (§ 2.3).
CLR (Model 6524) Erase recorded measurements (§ 2.3.3).

1.8 LCD Display
G nF
µF
M
VDC
AC
k
<
>
ALARM
MEM
VAR
DARPI T1T2
k nF/ km
M mAµA
G VHz
%
G
M
HOLD
REL
P
1
2
3
4
Figure 5
1. Logarithmic bar graph displays insulation measurements
2. Secondary display area
3. Main display area
4. Icons/indicators
When the measured value is below the minimum, the instrument displays - - - - .
When measuring voltage, if the reading falls outside the range dened by the
positive and negative limits, the instrument displays OL or – OL.

Megohmmeter Model 6522/6524 11
2. OPERATION
Except when measuring voltage, all measurements must be made on powered-
off systems. Therefore check to ensure there is no voltage on the system under
test before making a non-voltage measurement. When the rotary switch is set
to the voltage or an insulation testing position, the instrument measures and
displays any voltage present at the input terminals prior to the user pressing the
test button.
2.1 Setting Up the Instrument
2.1.1 Configuration Settings

SET-UP
> 2s
A >2 second press of the SET-UP button enables you to
change conguration settings on the instrument. You can
then use the ▲and ►buttons to scroll through and modify
parameters.
In Set-Up mode, the ▲ button performs the following functions:
1st press
on 
The alarm buzzer is active. To
deactivate it:
1. Press . On will blink to
indicate it is selected.
2. Press to change the
setting to OFF.
3. Press to validate the
change.
The symbol disappears from the
display when you exit Set-Up.
Note that this setting reverts to On
when you turn OFF the instrument.

2nd press
on 
P
Automatic switching to standby
mode is activated. To deactivate it:
1. Press to select OFF (the
setting blinks).
2. Press to change the
setting to On.
3. Press to validate the
change.
The
P
symbol appears on the
display when you exit Set-Up.
Note that this setting reverts to OFF
when you turn OFF the instrument.
3rd press
on 
Displays the instrument model
number.
4th press
on 
Displays the instrument rmware
version.
5th press
on 
Displays the instrument hardware
version.
6th press
on 
Return to the rst press.
2.1.2 Alarms
The instrument includes an alarm function that sounds an audible buzzer when a
dened alarm condition is measured. Alarm features are model-dependent (see
below).
2.1.2.1 Activating/Deactivating the Alarm Function
Model 6522:

TEST
The alarm is available in continuity testing mode. Pressing
the TEST button activates the alarm. The symbol appears
on the LCD, along with the threshold value (2Ω). If the
measurement is below this threshold and the buzzer is active,
the instrument emits an audible signal.

Megohmmeter Model 6522/6524 13
Model 6524:

The alarm is available in insulation, resistance, and continuity
measurement modes. Pressing the button activates the
alarm. The symbol is displayed, along with the threshold
value.
ALARM
<
To turn OFF the alarm buzzer while it is sounding, press the HOLD button. To
deactivate an active alarm function, press the button.
2.1.2.2 Setting an Alarm Threshold
While is displayed indicating the alarm function is active, you can change
the alarm threshold by pressing the button (except during insulation
measurements). For each testing mode, there are three pre-dened threshold
values:
■ Continuity: < 2Ω, <1Ω and <0.5Ω
■ Resistance: >50kΩ, >100kΩ and >200kΩ
■Insulation:
50V : <50kΩ, <100kΩ and <20kΩ
100V : <100kΩ, <200kΩ and <400kΩ
250V : <250kΩ, <500kΩ and <1MΩ
500V : <500kΩ, <1MΩ and <2MΩ
1000V : <1MΩ, <2MΩ and <4MΩ

In each measurement mode, the third threshold can be replaced by a user-
dened value. To do this:
1. Press the ► button while the threshold value is displayed.
2. The > symbol starts blinking; you can change it to < by pressing the 
button. This symbol indicates the direction of the alarm threshold: < for a
low threshold and > for a high threshold.
3. To change the threshold setting, press the ► button to navigate to the
rst digit, and then use the button to change its value.
4. Use the ► and buttons to select and change the other digits in the
threshold value, as well as the units of measurement.
5. When nished setting the threshold, press the ► button to validate the
setting.
2.1.2.3 Viewing Alarms
When the measurement is below a low alarm threshold or above a high alarm
threshold, the instrument emits a continuous audible signal and the LCD
indicates the threshold crossed:
ALARM <
M
ALARM
k
M
>
When checking continuity, this enables you to determine whether or not the
continuity measurement is less than 2Ω simply by listening, without looking at the
display. You can similarly check insulation quality.

Megohmmeter Model 6522/6524 15
2.1.3 ∆REL Function (Model 6524)

CLR
REL
For an insulation, resistance, or capacitance measurement,
you can congure the instrument to subtract a reference value
from the measured value and display the difference.
To activate this function, take a measurement, and then press
the ∆REL button. This measurement becomes the reference
(Rref) and will be stored and subtracted from subsequent
measurement values (Rmeas). The ∆REL symbol appears on
the LCD while this function is activated.
M
REL
V
G
If the measured value is less than the stored value, the display becomes
negative.
You can display the difference as a percentage of the reference ( )
by pressing the button until the % sign appears:
%
M
REL
G
For insulation measurements, only the digital display is modified by ∆REL. The
bar graph continues to display the true measured value.
To deactivate the ∆REL function, press the ∆REL button or turn the rotary switch
to another setting.

2.1.4 HOLD Function

HOLD
Pressing the HOLD button freezes the display of the
measurement. This can be done in all functions except the MΩ
settings, or during a timed measurement ( , DAR, PI).
To unfreeze the display, press the HOLD button again.
2.1.5 Backlighting

0
Pressing the button turns ON backlighting for the LCD.
To switch it OFF, press the button again. Otherwise,
backlighting goes OFF automatically at the end of one
minute.
2.1.6 Standby Mode
After 5 minutes of operation with no user activity, the instrument automatically
switches to standby mode. To restore normal operation, simply press any button.
The instrument returns to the state it was in prior to entering standby mode, with
no loss of information (value of the last measurement, compensation of the leads,
∆Rel, timed mode, alarm, etc.).
Automatic switching to standby mode is disabled during:
■insulation measurements in mode and in timed mode ( , PI, or
DAR).
■continuity measurements, for as long as measurements are made.
Automatic switching to standby is disabled via the SET-UP button (see § 2.1.1).