Aemc instruments 6536 User Manual

Megohmmeter
Model 6536

User Manual

ENGLISH

www.aemc.com

®

CHAUVIN ARNOUX GROUP

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 #: 2155.56

Model #: 6536

Please fill in the appropriate date as indicated:

Date Received: _________________________________

Date Calibration Due: _______________________

Chauvin Arnoux®, Inc.
d.b.a AEMC® Instruments

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: [phone] or [phone] • Fax: [phone]

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 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 and AEMC® are registered trademarks of AEMC® Instruments.

Thank you for purchasing the Megohmmeter Model 6536.

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 600V

RMS

with respect to ground or 700V

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.

RMS

maximum

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

1.5 Front of Instrument ...............................................................................6

1.6 Back of Instrument ................................................................................7

1.7 Terminals ..............................................................................................8

1.8 Function Buttons ...................................................................................8

1.9 LCD Display .........................................................................................9

2. OPERATION .......................................................................... 10

2.1 Setting Up the Instrument ...................................................................10

2.1.1 Conguration Settings ...........................................................10

2.1.2 Alarms.....................................................................................11

2.1.2.1 Activating/Deactivating the Alarm Function .................... 11

2.1.2.2 Setting an Alarm Threshold ............................................12

2.1.2.3 Viewing Alarms ..............................................................13

2.1.3 ∆REL Function .......................................................................13

2.1.4 HOLD Function.......................................................................14

2.1.5 Backlighting ............................................................................15

2.1.6 Standby Mode ........................................................................15

2.2 Taking Measurements .........................................................................15

2.2.1 Voltage Measurement.............................................................15

2.2.2 Insulation Measurement .........................................................17

2.2.2.1 TEST Button Operation ..................................................19

2.2.2.2 Timed Tests ...................................................................19

2.2.2.3 Remote Control Probe (Optional) ..................................20

2.2.3 Continuity Measurement.........................................................21

2.2.3.1 Lead Compensation .......................................................21

2.2.3.2 Continuity Measuring .....................................................22

2.2.4 Resistance Measurement .......................................................23

2.2.5 Floor Resistance Testing ........................................................24

2.2.5.1 Setup..............................................................................25

2.2.5.2 Test Procedure ...............................................................25

2.2.5.3 Measurement Results ....................................................28

2

Megohmmeter Model 6536

3. SPECIFICATIONS ................................................................. 29

3.1 General Reference Conditions ...........................................................29

3.2 Electrical Specications ......................................................................29

3.2.1 Voltage Measurement.............................................................29

3.2.2 Insulation Measurement .........................................................30

3.2.3 Continuity Measurement.........................................................31

3.2.4 Resistance Measurement .......................................................32

3.2.5 Timer.......................................................................................32

3.2.6 Floor Resistance Testing ........................................................32

3.3 Operating Environment .......................................................................32

3.3.1 Voltage Measurement.............................................................32

3.3.2 Insulation Measurement .........................................................33

3.3.3 Resistance and Continuity Measurement ...............................34

3.3.4 Intrinsic Uncertainty and Operating Uncertainty .....................35

3.4 Power Supply......................................................................................35

3.5 Environmental Conditions ...................................................................36

3.6 Mechanical Specications .................................................................36

3.7 Safety Standards ................................................................................36

4. MAINTENANCE & TROUBLESHOOTING ...............................37

4.1 Maintenance .......................................................................................37

4.1.1 Cleaning .................................................................................37

4.1.2 Replacing the Batteries ..........................................................37

4.2 Troubleshooting ..................................................................................39

4.2.1 Errors ......................................................................................39

4.2.1.1 Voltage present before an insulation measurement.......39

4.2.1.2 Range exceeded during an insulation measurement.....39

4.2.1.3 Voltage during continuity/resistance measurement .......40

4.2.2 Resetting the Instrument ........................................................40

4.3 Repair and Calibration ........................................................................40

4.4 Technical and Sales Assistance ..........................................................41

4.5 Limited Warranty .................................................................................41

4.6 Warranty Repairs ................................................................................41

Megohmmeter Model 6536

3

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 6536.............................................................. Cat. #2155.56

Megohmmeter Model 6536 ESD Floor Kit ....................................... Cat. #2155.57

Shipping Contents:

Megohmmeter Model 6536

Two color-coded (red/black) 1.5m test leads,

two alligator clips, two grip probes and

one test probe (black)

Also includes 6 AA batteries and a user manual.

4

Soft Carrying Case

ESD Floor Kit

(only with Cat. #2155.57)

Megohmmeter Model 6536

1.2 Accessories

Megohmmeter Test Probe (600V CAT IV) ........................................Cat. #2155.75

Case - Field Case (Waterproof - Replacement for ESD Floor Kit) ... Cat. #2118.98

Case - Hands Free Carrying Case ................................................... Cat. #2118.99

Continuity Pole .................................................................................Cat. #2138.54

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

Probe - Set of 2, Color-coded (Red/Black) Grip Probes ................... Cat. #2152.26

Weights - Set of 2, 5 lbs each with conductive rubber bottom pad

(RoHS) ..............................................................................................Cat. #2155.76

Adapter - 4mm non-insulated for safety leads

(Replacement for ESD Floor Kit) ...................................................... Cat. #1017.45

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

1.4 Description

The Megohmmeter Model 6536 is a portable measuring instruments with digital

displays, and is powered by batteries. The instrument measures insulation with

test voltages from 10 to 100V in one-volt steps. Other features include:

■ Continuity measurement

■ Resistance measurement

■ Programmable alarms

The Model 6536 is also available as a oor resistance testing kit (see § 2.2.5)
for testing both point-to-ground and point-to-point electrostatic discharge (ESD).
In addition to the instrument, the kit contains two 5 lb (2.3 kg) oor weights
(also referred to as NFPA probes) that are in compliance with EOS/ESD 11.11
specications. Each oor weight is coated with insulating paint and a conductive
rubber base. The instrument, oor weights, and test leads are packaged in a
rugged eld case. The kit provides all the necessary elements for compliance
with the ANSI/ESD STM97.2-2006 standard for testing ESD ooring.

Megohmmeter Model 6536

5

1.5 Front of Instrument

VAR

>

<

ALARM

HOLD

REL

G
M mAµA
k

G

G
M
k

P

1

M

G

2

DC
AC

V

3

4

k

HOLD

V

Ω

SET-UP

MEM

TEST

OFF

Ω

CLR

0

REL

MΩ

VAR

5

MEGOHMMETER

MODEL 6536

Figure 1

1. Input terminals

2. Blue backlit LCD

3. Six function buttons (see § 1.8)

4. TEST button to start insulation measurements (see § 2.2.2.1)

5. Five-position rotary switch to choose the function or to turn the instrument

OFF

6

Megohmmeter Model 6536

1.6 Back of Instrument

1

2

3

4

5

Figure 2

1. Captive quarter-turn screw

2. Battery compartment cover

3. Mounting magnets, molded into instrument case

4. Non-skid pads

5. Stand

Megohmmeter Model 6536

7

1.7 Terminals

0

> 700V

600V CAT IV

Figure 3

The instrument has one positive ( + ) terminal and one negative ( - ) terminal. The
negative terminal also supports the remote probe accessory (see § 2.2.2.3).

1.8 Function Buttons

Several keys have two functions. One is marked on the key, and is enabled via
a short press. The second function is marked under the key, and is enabled by a

long (>2 seconds) press.

BUTTON

HOLD

SET-UP

 

∆Rel

DESCRIPTION

Selects the and functions (§ 2.2.2).

Toggles backlighting ON and OFF (§ 2.1.5).

Freezes/unfreezes the displayed measurement on the LCD (§

2.1.4).

Accesses the instrument’s setup parameters and information (§

2.1.1).

Applies lead compensation in continuity testing (§ 2.2.3.1).

Activates/deactivates alarms (§ 2.1.2).

The  and  keys allow you to:

■ 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 (§ 2.1.2).

Displays the difference between the present measurement and a
stored reference measurement (§ 2.1.3).

8

Megohmmeter Model 6536

1.9 LCD Display

G
M

V

DC
AC

k

<

>

ALARM

VAR

k

M mAµA

G

G

M

HOLD

REL

P

1

2

3

4

Figure 4

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 6536

9

2. OPERATION



SET-UP

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

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

> 2s

parameters.

In Set-Up mode, the ▲ button performs the following functions:

1st press
on 

10

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.

Megohmmeter Model 6536

2nd press

P



on 

3rd press

on 

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.

Displays the instrument model
number.

4th press

on 

5th press
on 

6th press

on 

Displays the instrument rmware

version.

Displays the instrument hardware
version.

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.

2.1.2.1 Activating/Deactivating the Alarm Function

The alarm function is available in insulation, resistance, and

continuity measurement modes. Pressing the button

activates the alarm. The
with the threshold value.

TEST

symbol appears on the LCD, along

Megohmmeter Model 6536

11

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: <10kΩ, <50kΩ and <100kΩ

In each measurement mode, the third threshold can be replaced by a user­de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.

12

Megohmmeter Model 6536

2.1.2.3 Viewing Alarms

ALARM

<

M

ALARM

k

M

>



CLR

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:

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.

2.1.3 ∆REL Function

For an insulation or resistance measurement, you can

congure the instrument to subtract a reference value from the

measured value and display the difference.

To activate this function, press the ∆REL button during

REL

Megohmmeter Model 6536

an active measurement. 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.

13

M

REL

V

G

If the measured value is less than the stored value, the display becomes



HOLD

negative.

You can display the difference as a percentage of the reference ( x

100) by pressing the  button until the % sign appears:

%

G

M

REL

For insulation measurements, only the digital display is modied by ∆REL.
The bar graph continues to display the true measured value.

To deactivate the ∆REL function, press the ∆REL button during an active
measurement, or turn the rotary switch to another setting.

2.1.4 HOLD Function

14

Pressing the HOLD button freezes the display of the
measurement. This can be done in all functions except during a

timed measurement ( ).

To unfreeze the display, press the HOLD button again.

Megohmmeter Model 6536

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 mode.

■ continuity measurements, for as long as measurements are made.

Automatic switching to standby is disabled via the SET-UP button (see § 2.1.1).

2.2 Taking Measurements

2.2.1 Voltage Measurement

To ensure proper and accurate operation of the instrument, we recommend
measuring a known voltage (such as an electrical outlet) before measuring

unknown voltages.

1. Set the switch to V or MΩ VAR.

Megohmmeter Model 6536

15

V

k

Ω

OFF

Ω

MΩ

VAR

2. Using the leads, connect the system to be tested to the instrument’s

V

DC

AC

terminals.

G VHz

DC

AC

V

The instrument displays the voltage on the terminals. It detects whether the
voltage is AC or DC.

16

Megohmmeter Model 6536

In the MΩ VAR setting, the symbol indicates that the voltage is too high

V

k

Ω

OFF

Ω

MΩ

VAR

(>25V) and that insulation measurements are prohibited.

If the voltage is >15V, continuity and resistance measurements are prohibited.

2.2.2 Insulation Measurement

Insulation measurement results can be affected by the impedances of
additional circuits connected in parallel or by transient currents.

Do not start any measurement while the symbol is displayed.

1. Set the rotary switch to the MΩ VAR position.

2. The instrument displays the congured test voltage. To modify this

setting, press the ► key to enter edit mode (The rst digit of the voltage
setting blinks). You can change this by pressing the ▲ key. Then use the
► and ▲ keys to navigate to and change the remaining digits. Allowable
test voltages are 10 through 100V. When nished, press ► to validate

the change.

3. Use the leads to connect the system to be tested to the instrument’s

terminals. The system under test 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 device under test.

Megohmmeter Model 6536

17

DC

V

3. (Optional) Press the  button to display the current or the elapsed time.

(You can also do this during the measurement.)

4. Press the TEST button and hold it down until the displayed

measurement is stable. Note that if the instrument detects a voltage
greater than 25V in the system under test, pressing the TEST button
has no effect because the test will be prohibited. (An error screen will
appear.)

5. The resistance measurement is displayed on the LCD’s main display

area and on the bar graph. The secondary display area indicates the test
voltage generated by the instrument.

M

G V



> 1s

TEST

The symbol indicates that the instrument is generating a hazardous

voltage (>70V).

6. At the end of the measurement, release the TEST button. The

instrument stops generating the test voltage and discharges the device

being tested. The symbol is displayed until the voltage on the

system under test has fallen below 70V.

18

M

Megohmmeter Model 6536

NOTE: Do not disconnect the leads and do not start any measurement while the

symbol is displayed.

When you release the TEST button, the measurement results remain displayed
until the next measurement, or the HOLD button is pressed, or the instrument is
turned OFF.

2.2.2.1 TEST Button Operation

Pressing the TEST button starts an insulation measurement. In normal mode, the
test voltage is generated for as long as the button is pressed. When the button is
released, the measurement stops.

In mode, press the test button once to start the measurement, then press it a
second time to stop; there is no need to keep the button pressed. However, if you
do not stop the measurement, it will stop automatically after 15 minutes.

In timed test mode ( ) press the TEST button once to start the measurement.

The test will stop automatically at the end of the dened test duration time.

2.2.2.2 Timed Tests

The TIMER button activates timed test mode. This button is active only for
insulation measurements.

1st press This locks the TEST button. After you start the

measurement, it continues to run without requir­ing you to keep the TEST button pressed. The
test will run until you stop it, or when 15 minutes
have passed.

2nd press This activates timed test mode. You can set a test

duration between 1 and 39:59 minutes. Use the

 and  buttons to modify the value displayed.

When the time duration is displayed, press the

 button to enter edit mode. When the rst digit
blinks, you can change it using the  button.

Press  to go to the next digit and  to change
it. Then press  to validate.

3th press Exits timed test mode.

When is activated, pressing the TEST button starts the test. The LCD displays
the measurement, along with a “countdown” timer showing the time remaining in
the test. The test automatically stops when the duration end time is reached and
the result is displayed.

Megohmmeter Model 6536

19

DAR



HOLD



TEST

Successive presses on the  button display intermediate
values. These include:

■ programmed time

■ voltage at the end of the measurement

■ current at the end of the measurement

Press the TEST button to return to voltage measurement.

2.2.2.3 Remote Control Probe (Optional)

The optional remote control probe is used to trigger the measurement using the
TEST button on the probe. To use this accessory, refer to its separate operating
instructions.

M

M

DAR

When the probe is connected, the symbol is displayed on the
instrument’s LCD.

20

DC

V

Megohmmeter Model 6536

2.2.3 Continuity Measurement



0

> 2s

0

Continuity measurement measures a low resistance (<10 or 100Ω depending on
the current) at a high current (200 or 20mA).

A current of 20mA reduces the power consumption of the instrument,
increasing its battery life. However, the standard IEC 61557 requires
200mA current for continuity testing.

If an external voltage >15V is detected in the system under test during the

continuity measurement, the instrument is protected without a fuse. The
continuity measurement is stopped and the instrument reports an error

until the voltage disappears.

2.2.3.1 Lead Compensation

Before checking continuity, you should compensate for the
resistance of the measurement leads. This ensures that the
resistance measurement excludes the resistance in the leads.
To do this, set the rotary switch to Ω. Then short-circuit the
measurement leads and press the

button for >2 seconds.

M mA

The display changes to zero and the symbol is displayed. The resistance
of the leads will be systematically subtracted from all continuity measurements. If
the resistance of the leads is >10Ω, there is no compensation. The compensation
remains in memory until the instrument is turned OFF.

If the leads are changed with no change of compensation, the display may
become negative. The instrument reports that the compensation must be redone

by displaying a blinking

Megohmmeter Model 6536

symbol.

21

To remove the compensation of the leads, leave the leads open and press the

0

V

k

Ω

OFF

Ω

MΩ

VAR

button for >2 seconds. The LCD displays the resistance of the leads and

the symbol goes off.

2.2.3.2 Continuity Measuring

1. Set the rotary switch to Ω.

2. Press the ► button to display the measurement current. The

measurement current appears blinking on the LCD. You can change the

current by pressing the ► button.

3. Use the leads to connect the instrument to the system to be tested. The

system to be tested must be powered down.

M mA

R

22

Megohmmeter Model 6536

M mA

The instrument displays the

V

k

Ω

OFF

Ω

MΩ

VAR

k

resistance and the current used in
the test.

To obtain a continuity value per

standard IEC 61557:

1. Take a measurement at

200 mA and note its value,

R1.

2. Reverse the leads and

note the value R2.

3. Calculate the mean:

2.2.4 Resistance Measurement

Resistance measurements are made with a low current.

1. Set the rotary switch to kΩ.

2. Connect the system to be tested to the instrument. The device to be

tested must be powered down.

3. The instrument displays the results.

Megohmmeter Model 6536

23

2.2.5 Floor Resistance Testing

ANSI/ESD STM97.2-2006 is the standard test method for measuring the
electrostatic voltage on a person in combination with oor materials and footwear
as a system. ESD STM 97.2 can be used to characterize ESD protective oor
materials including oor coverings (tiles, carpets, epoxies, and laminated
structures), mats, paints/coatings, and oor nishes. Electrostatic voltage must
be less than +/-100V.

The Model 6536 can be purchased as part of a kit speci
testing oor resistance in areas where electrostatic discharge is a concern, such

as computer rooms, electronic assembly rooms, and hospitals. In addition to the
instrument, the kit includes two 5 pound (2.3kg) floor weights (also called NFPA

probes) for consistent and repeatable contact with the surface under test. The
floor weights are in compliance with EOS/ESD 11.11 specifications. Each floor
weight is coated with insulating paint and rubber base.

cally designed for

24

Megohmmeter Model 6536

The instrument, oor weights, and test leads are packaged in a rugged eld

case. The kit provides all the necessary elements for compliance with the ANSI/
ESD STM97.2-2006 standard for testing ESD ooring. The kit can test the
effectiveness of conductive carpets, mats, tables, chairs, and other items.

The following simplied procedure is an extrapolation from the ANSI/ESD
STM97.2-2006 standard. You may also refer to other sources for alternate

procedures.

2.2.5.1 Setup

■ The oor sample should consist of a section covering 48 x 48” (122 x
122cm) in area.

■ When the sample is to be tested after installation, the test area
dimensions should not exceed a section of oor 20 x 20’ (6.1 x 6.1m).

■ Whenever possible, condition the test area at least 24 hours at 73.4°F
±1.8°F (23°C ±1°C) and 50% ±5% RH and test under the same

conditions.

2.2.5.2 Test Procedure

1. For uninstalled panels: Place the dry specimen on a nonconductive
surface and lightly wipe with a lint-free cloth to remove any foreign
material prior to placing the weights. Place the weights 2” (5.1cm) from
an edge of the sample and 36” (91cm) apart. Apply 100V and take a
reading ve seconds after application of the voltage.

2. For installed panels: Place the weights 36” (91cm) apart and at least
36” (91cm) from any ground connections or grounded object resting
on the oor sample. Apply 100V and take a reading ve seconds after

application of the voltage.

3. Unless otherwise specied, make ve measurements on each oor

section with the weights at different locations for each measurement,

and record the value to two signicant gures (see Figure 5 below).

Megohmmeter Model 6536

25

36 "

Table Top

Electrodes

> 700V

600V CAT IV

Figure 5

4. Repeat this procedure with the Model 6536 connected between one
weight and a known electrical ground (Figure 6).

26

Megohmmeter Model 6536

Groundable Points

Table Top

Electrode

> 700V

600V CAT IV

Figure 6

For an uninstalled oor sample (step 1) the ground should be part of
the sample panel. For an installed oor sample (step 2) the ground

should be a water pipe or known electrical ground. Swap the leads at
the instrument for each measurement and record the average value
obtained as the value for that measurement.

5. When nished, turn off the Model 6536 and return it to the case.

If the resistance changes with time during a measurement, the value observed
after about 5 seconds should be considered the measured value.

Megohmmeter Model 6536

27

2.2.5.3 Measurement Results

The following values may serve as a minimum resistivity level to provide an
appropriate level of protection in manufacturing environments.

■ Resistance from electrode to electrode (Figure 5): Measured value: ≥

1MΩ

■ Resistance from test electrode to a groundable point (Figure 6):
Measured value: ≤ 10,000MΩ (10GΩ)

28

Megohmmeter Model 6536

3. SPECIFICATIONS

3.1 General Reference Conditions

Quantity of Inuence Reference Values

Temperature 23° ± 3°C (73.4° ± 5.4°F)

Relative humidity 45 to 55% RH

Frequency DC and 45 to 65Hz

Supply voltage

Electric eld 0V/m

Magnetic eld < 40A/m

■ The intrinsic uncertainty is the error specied for the reference
conditions.

■ The operating uncertainty includes the intrinsic uncertainty plus

variations of the quantities of inuence (position, supply voltage,
temperature, etc.) as dened in standard IEC 61557.

In this section, uncertainties are typically expressed as % of the reading (R)
plus number of display counts (ct).

8 ± 0.2V
battery life indication 58% ± 8%

3.2 Electrical Specifications

3.2.1 Voltage Measurement

Specic reference conditions: Peak factor = 1.414 in AC, sinusoidal signal.

Measurement Range 0.3 to 399.9V 400 to 700V

Resolution 0.1V (AC and DC) 1V (AC and DC)

Accuracy ± (3% R + 2 ct)

Input impedance 400kΩ

Frequency ranges DC and 15.3 at 800Hz

Megohmmeter Model 6536

29

3.2.2 Insulation Measurement

Specic reference condition: Capacitance in parallel on resistance = null.

Test Voltage

10 to 100V (VT/5)kΩ to (VT/5)GΩ

Accuracy

Test Voltage
(VT)

Measurement
Range

Resolution 1kΩ 10kΩ 100kΩ 1MΩ 10MΩ

Accuracy ± (3% + 2 ct + (10%/VT) per MΩ)

With a test voltage ≥ 50V and an insulation resistance ≤ 2GΩ, the accuracy is ±
(3% + 2 ct).

Bar Graph

Measurement Range 0.1MΩ to 50GΩ*

Resolution 9 segments per decade

Accuracy ± (5% R + 1 segment)

*When the measurement range is exceeded, the whole bar graph is displayed.

(VT)

2 to 999kΩ

and 1.000 to

3.999 MΩ

4.00 to

39.99MΩ

R

10 to 100V

40.0 to

399.9MΩ

400 to

3999MΩ

4.00 to

20.00GΩ

Test Voltage (VT)

Measurement
Range

Resolution 0.1V

Accuracy ± (3% R + 3 ct)

Typical Discharge Time after Test

To go from VT to 25V, the discharge time is < 2s/µF.

Test Current

Maximum test current: 2mA

30

0.0 to 100V

Megohmmeter Model 6536

Measurement
Range

Resolution 10nA 100nA 1µA

Accuracy ± (10% R + 3 ct)

Typical test voltage vs load curve

The voltage as a function of the measured resistance is illustrated below:

The range of operation per IEC 61557 is from 100kΩ to 2GΩ (see § 3.3.4).

0.01 to

39.99µA

40.0 to

399.9µA

0.400 to

2.000mA

3.2.3 Continuity Measurement

Specic reference condition: Inductance in series with the resistance = zero.

Measurement Range (without
compensation of the leads)

Resolution 10mΩ 100mΩ

Accuracy ± (2% + 2 ct)

Test Current 200mA 20mA

Open Voltage ≥ 6V

*In the case of incorrect compensation of the leads, the instrument allows display

of negative values, down to -0.05Ω at 200A and -0.5Ω at 20mA.

Test Current

200mA range: 200mA (0mA + 20mA)

20mA range: 20mA ± 5mA

Measurement Range 0 to 250mA

Megohmmeter Model 6536

0.00* to 10.00Ω 0.0* to 100.0Ω

31

Resolution 1mA

Accuracy ± (2% + 2 ct)

Compensation of the Leads: 0 to 9.99Ω.

3.2.4 Resistance Measurement

Measurement Range

Resolution 1Ω 10Ω 100Ω 1kΩ

Accuracy ± (3% + 2 ct)

Open voltage approximately 4.5V

0 to

3999Ω

4.00 to

39.99kΩ

40.0 to

399.9kΩ

400 to

1000kΩ

3.2.5 Timer

Measurement Range 0:00 to 39:59

Resolution 1s

Accuracy ± 1s

3.2.6 Floor Resistance Testing

The two oor weights that come with the oor testing kit comply with the ESD
protection standards IEC 61340-2-3 and IEC 61340-4-1.

3.3 Operating Environment

3.3.1 Voltage Measurement

Inuencing
Parameter

Temperature

Relative
humidity

Frequency

32

Range of
inuence

20 to + 55°C
(-4 to 131°F)

20 to 80%

RH

15.3 to
800Hz

Quantity

inuenced

V, F

V, F 1% R + 2 ct

V 1% 2% R + 1 ct

Typical Maximum

Inuence

0.3% R/10°C + 1 ct
(0.3% R/18°F +

Megohmmeter Model 6536

1 ct)

Supply
voltage

6.6 to 9.6V V, F 0.1% R + 2 ct

Common
mode

rejection in

0 to 600V

AC

V 50dB 40dB

AC 50/60 Hz

3.3.2 Insulation Measurement

Inuencing
Parameter

Temperature

Relative
humidity

Supply
voltage

50/60Hz

AC voltage
superposed
on the test

voltage (VT)

+ 1pt

+ 1 ct

Inuence

2% R/10°C + 2 ct
3% R/10°C + 2 ct
4% R/10°C + 2 ct

0.5% R/10°C +

1 ct

2% R/10°C + 2 ct

Range of
Inuence

-20 to + 55°C
(-4 to 131°F)

Quantity

Inuenced

MΩ

R ≤ 3GΩ

3GΩ < R < 10GΩ

10GΩ ≤ R

VT: 10 to 100V

Measurement

current

Typical Maximum

1% R/10°C

1% R/10°C

MΩ 2% R + 1 ct 3% R + 2 ct

20 to 80% RH

VT: 50 to 100V 1% R + 2 ct

Measurement

current

1% R + 2 ct

6.6 to 9.6V MΩ 0.1% R + 2 ct

VT = 10V:

R ≤ 0.1GΩ : 10V

from 0.1 to 0.3GΩ : 0.2V

VT = 25V:

R ≤ 0.1GΩ : 10V

from 0.1 to 0.5GΩ : 0.2V

VT = 50V:

5% R + 2 ct

R ≤ 0.1GΩ : 4V

from 0.1 to 1GΩ : 0.2V

VT = 100V:

from 100kΩ to 10MΩ : 20V

from 10MΩ to 1 GΩ : 0.3V

Megohmmeter Model 6536

33

Capacitance
in parallel on
resistance to
be measured

Common
mode

rejection in
AC 50/60 Hz

0 to 5µF at

1mA

0 to 2µF

0 to 1µF

0 to 600Vac V 50dB 40dB

MΩ 1% R + 1 ct

VT = 10V and

25V

from 10kΩ to 1

GΩ

VT = 50V and

100V

from 10kΩ to 3

GΩ

VT = 50V

≤ 5GΩ

2% R + 1 ct 3% R + 2 ct

6% R + 2 ct 10% R + 2 ct

6% R + 2 ct 10% R + 2 ct

3.3.3 Resistance and Continuity Measurement

Inuencing
Parameter

Temperature

Relative
humidity

Supply voltage 6.6 to 9.6V

50/60Hz

AC voltage
superposed on
the test voltage

(VT)

Common mode

rejection in AC
50/60 Hz

Range of
Inuence

-20 to + 55°C
(-4 to 131°F)

20 to 80% RH

0.5Vac at 200mA

For R ≥ 10Ω:

0.4Vac

Accepts no

perturbations

0 to 600Vac

Quantity

Inuenced

at 200mA 2% R/10°C + 2 ct

at 20mA 2% R/10°C + 2 ct

R 1% R/10°C + 2 ct

at 200mA 4% R + 2 ct

at 20mA 4% R + 2 ct

R 3% R + 2 ct

at 200mA

at 20mA

R

at 20mA

R

at 200mA

at 20mA

R

Typical Maximum

Inuence

0.1% R + 2 ct

5% R + 10 ct

50dB 40dB

34

Megohmmeter Model 6536

3.3.4 Intrinsic Uncertainty and Operating Uncertainty

These megohmmeters comply with standard IEC 61557, which requires that the
operating uncertainty (called B) must be less than 30%.

In insulation and continuity measurements:

where:

A = intrinsic uncertainty

E1 = inuence of the reference position ± 90°

E2 = inuence of the supply voltage within the limits indicated by the
manufacturer

E3 = inuence of the temperature between 0 and 35°C (32 and 95°F)

3.4 Power Supply

The instrument is powered by six 1.5V alkaline AA (LR6) batteries.

The voltage range ensuring correct operation is from 6.6V to 9.6V.

Typical life between charges:

Megohmmeter Model 6536

35

■ Insulation: 6000 5-second measurements at 100V for R = 100kΩ, at the

rate of one measurement per minute

■ Continuity: 3000 5-second measurements, at the rate of one

measurement per minute

3.5 Environmental Conditions

Indoor use

Range of operation: -20 to +55°C (-4 to 131°F) and 20 to 80% RH

Range of storage (without batteries): -30 to +80°C (-22 to 176°F) and 10 to 90%

RH without condensation

Altitude: <2000m (6562ft)

Degree of pollution: 2

3.6 Mechanical Specifications

Dimensions (L x W x H): 211 x 108 x 60mm (8.31 x 4.25 x 2.36”)

Weight: approximately 850g (1.87lb)

Ingress protection:

■ IP 54 per IEC 60529, not in operation

■ IK 04 per IEC 50102

Drop test: per IEC 61010-1

3.7 Safety Standards

Safety according to: EN 61010-2-30 : 2010

Insulation Class: 2

Pollution Degree: 2

Overvoltage Category: 600V CAT IV

Immunity according to: EN 61326-1 : 2013

Emission according to: EN 61326-1 : 2013

Specications are subject to change without notice.

36

Megohmmeter Model 6536

4. MAINTENANCE & TROUBLESHOOTING

G VHz %

Except for the batteries, the instrument contains no parts that can
be replaced by personnel who have not been specially trained and
accredited. Any unauthorized repair or replacement of a part by an

“equivalent” may impair safety.

4.1 Maintenance

4.1.1 Cleaning

Disconnect the unit completely and turn the rotary switch to OFF.

Use a soft cloth, dampened with soapy water. Rinse with a damp cloth and
dry rapidly with a dry cloth or forced air. Do not use alcohol, solvents, or
hydrocarbons.

Do not use the instrument again until it is completely dry.

4.1.2 Replacing the Batteries

At start-up, the instrument displays the remaining battery life:

If the battery voltage is too low to ensure correct operation of the instrument, a
“low battery” message appears on the LCD and the symbol blinks:

Megohmmeter Model 6536

37

This indicates the batteries must be replaced. All batteries must be replaced at
the same time. To do this:

1. Disconnect any attached leads or accessories from the instrument and

turn the rotary switch to OFF.

2. Use a tool or a coin to turn the quarter-turn screw of the battery

compartment cover.

3. Remove the battery compartment cover.

4. Remove the batteries from the compartment.

Do not treat spent batteries as ordinary household waste. Take them to
the appropriate collection facility for recycling.

38

Megohmmeter Model 6536

5. Place the new batteries in the compartment, ensuring that each battery’s

G

<

M mAµA

G

polarity is correct.

6. Put the battery compartment cover in place and screw the quarter-turn

screw back in.

4.2 Troubleshooting

4.2.1 Errors

During instrument operation, errors may be displayed on the LCD. The causes
of any errors must be corrected before the instrument can resume normal
operation.

4.2.1.1 Voltage present before an insulation measurement

Before taking an insulation
measurement, the instrument
measures voltage on the system under
test. If it detects voltage in excess

of 25V and you attempt to take a

measurement, the instrument displays
the message shown to the left, and no
measurement is taken.

You must eliminate the voltage to
resume taking the measurement.

4.2.1.2 Range exceeded during an insulation measurement

If during an insulation measurement
the value to be measured exceeds the
measurement range (which depends
on the test voltage), the instrument
reports this condition. For example, the
screen to the left is displayed when the
range is exceeded while measuring in

the 100V range.

Megohmmeter Model 6536

39

4.2.1.3 Voltage present during a continuity or resistance mea­surement

If during a continuity or resistance
measurement the instrument detects
an external voltage in excess of

15V (AC or DC), it interrupts the

measurement and displays the screen
show to the left.

You must eliminate the voltage to
resume the measurement.

4.2.2 Resetting the Instrument

You can reset your instrument at any time. To do this:

1. Press the ▲ and buttons simultaneously.

2. Turn the rotary switch to any setting other than OFF.

3. The instrument reboots.

4.3 Repair and Calibration

To ensure that your instrument meets factory specications, we recommend
that it be scheduled to be sent 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®, Inc. d.b.a. AEMC® Instruments

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.

40

Megohmmeter Model 6536

4.4 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:

Phone: [phone] • [phone]

E-mail: [e-mail]

4.5 Limited Warranty

The Model 6536 is warranted to the owner for a period of two years from the date

of original purchase against defects in manufacture. This limited warranty is
given by AEMC® Instruments, not by the distributor from whom it was purchased.
This warranty is void if the unit has been tampered with or abused, or if the
defect is related to service not performed by AEMC® Instruments.

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.

4.6 Warranty Repairs

What you must do to return an Instrument for Warranty Repair:

First, request a Customer Service Authorization Number (CSA#) by phone or by
fax from our Service Department (see address below), then return the instrument

along with the signed CSA Form. Please write the CSA# on the outside of the
shipping container. Return the instrument, postage or shipment pre-paid to:

Ship To: Chauvin Arnoux®, Inc. d.b.a. AEMC® Instruments

15 Faraday Drive • Dover, NH 03820 USA
Phone: [phone] (Ext. 360) • [phone] (Ext. 360)

E-mail: [e-mail]

Caution: To protect yourself against in-transit loss, we recommend you insure

your returned material.

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

NOTES:

NOTES:

®

CHAUVIN ARNOUX GROUP

03/18

99-MAN 100431 v3

Chauvin Arnoux®, Inc. d.b.a. AEMC® Instruments

15 Faraday Drive • Dover, NH 03820 USA

Phone: [phone] • Fax: [phone]

www.aemc.com