AEMC 6550 Operating Manual



10kV and 15kV MEGOHMMETERS

6550

6555

ENGLISH

User Manual

Megohmmeter Models 6550 / 6555

Cat. #2130.31 / Cat. #2130.32

Ships with the following:

PRODUCT PACKAGING

Small Classic Tool Bag

Cat. #2133.72

10kV Megohmmeter Model 6550

Cat. #2130.31

or

15kV Megohmmeter Model 6555

Cat. #2130.32

Set of 3 color-coded (red/blue/black) 9 ft (15kV) integral leads and alligator clips

(1000V CAT IV), set of 2 color-coded test probes (red/black 1000V CAT IV)

15kV Jumper Lead

Cat. #2151.15

Also Includes:

• USB Stick with DataView
and User Manual

• 2x9.6V NiMH batteries (Cat. #2140.19 each)

®

Software

Optical USB Cable

Cat. #2135.41

Cat. #2151.14

115V US Power Cord

Cat. #5000.14

Statement of Compliance

Chauvin Arnoux®, Inc. d.b.a. AEMC® Instruments certies
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 specications.

An NIST traceable certicate 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 #: 2130.31 / 2130.32

Model #: 6550 / 6555

Please ll in the appropriate date as indicated:

Date Received: ____________________________

Date Calibration Due: _______________________

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

www.aemc.com

Thank you for purchasing a Megohmmeter Model 6550/6555.
For best results from your instrument and for your safety, read the enclosed operating instructions carefully and

comply with the precautions for use. These products must be only used by qualified and trained users.

Signifies that the instrument is protected by double or reinforced insulation.

CAUTION - DANGER! Read the User Manual.

Risk of electric shock. The voltage at the parts marked with this symbol may be dangerous.

Refers to a type A current sensor. This symbol signifies that application around and removal
from HAZARDOUS LIVE conductors is permitted.

Refers to a type B current sensor. Do not apply around or remove from HAZARDOUS LIVE
conductors without additional protective means (de-energizing the circuit or wearing protec­tive clothing suitable for high voltage work).

Important instructions to read and to fully understand.

Useful information or tip to read.

USB socket.

Ground/Earth.

The CE marking guarantees conformity with European directives and with regulations covering
EMC.

Chauvin Arnoux® Inc. d.b.a. AEMC® Instruments has adopted an Eco-Design approach in order
to design this instrument. Analysis of the complete lifecycle has enabled us to control and
optimize the effects of the product on the environment. In particular this instrument exceeds
regulation requirements with respect to recycling and reuse.

The trash can with a line through it means that in the European Union, the product must
undergo selective disposal for the recycling of electric and electronic material, in compliance
with Directive WEEE 2002/96/EC.

Precautions Before Use

This instrument and its accessories comply with safety standards IEC 61010-1, IEC 61010-031, and
IEC 61010-2-030 for voltages of 1000V in Category IV at an altitude of less than 2000m, indoors, with
a degree of pollution of not more than 2. Failure to observe the safety instructions may result in electric
shock, fire, explosion, and destruction of the instrument and of the installations.

■ The operator and/or the responsible authority must carefully read and clearly understand the
various precautions to be taken in use. Sound knowledge and a keen awareness of electrical
hazards are essential when using this instrument.

■ If the instrument is used other than as specified, the protection it provides may be
compromised, thereby endangering you.

■ Do not use the instrument on networks of which the voltage or category exceeds those
mentioned.

■ Do not use the instrument if it seems to be damaged, incomplete, or poorly closed.

■ Before each use, check the condition of the insulation on the leads, housing, and accessories.
Any item of which the insulation is deteriorated (even partially) must be set aside for repair or
scrapping.

■ Use only the leads and accessories supplied. Using leads (or accessories) of a lower voltage or
category reduces the voltage or category of the combined instrument and leads (or accessories)
to that of the leads (or accessories).

■ Use personal protection equipment systematically.

■ Keep your hands away from the terminals of the instrument.

■ When handling the leads, test probes, and alligator clips, keep your fingers behind the physical
guard.

■ As a safety measure, and to avoid interference, do not move and do not handle the leads during
measurements.

Definition of Measurement Categories (CAT)

■ CAT IV - 3-Phase at utility connection, outdoor conductors:

- Origin of installation, or where low-voltage connection is made to utility power

- Electricity meters, primary overcurrent protection equipment

- Outside and service entrance, service drop from pole to building, runs between meter & panel

- Overhead line to detached building, underground line to well pump

■ CAT III - 3-Phase distribution, including single-phase commercial lighting:

- Equipment in fixed installations, such as switchgear and polyphase motors

- Bus and feeder in industrial plants

- Feeders and short branch circuits, distribution panel devices

- Appliance/equipment outlets with short connections to service entrance

■ CAT II - Single-phase, receptacle-connected loads:

- Appliances, portable tools, and other similar light industrial/household loads

- Outlet and long-branch circuits

- Outlets at more than 30 ft from CAT III source

- Outlets at more than 60 ft from CAT IV source

TABLE OF CONTENTS

1. INTRODUCTION ................................................................................................... 5

1.1 Receiving Your Shipment ....................................................................................................................... 5

1.1.1 Accessories and Replacement Parts .......................................................................................... 5

2. PRODUCT FEATURES .......................................................................................... 6

2.1 Description ............................................................................................................................................. 6

2.2 Front Panel Features .............................................................................................................................. 7

2.3 Display ................................................................................................................................................... 8

2.3.1 Example of Display Before Measurement ................................................................................... 8

2.3.2 Example of Display During Measurement ................................................................................... 8

2.3.3 Example of Display After Measurement ...................................................................................... 8

2.4 Button Functions ................................................................................................................................... 9

2.4.1 TEMP BUTTON ........................................................................................................................... 9

2.4.2 ALARM Button .......................................................................................................................... 10

2.4.3 CONFIG Button ......................................................................................................................... 11

2.4.3.1 Before the Measurement ................................................................................................... 11

2.4.3.2 During the Measurement ................................................................................................... 15

2.4.4 DISPLAY Button ........................................................................................................................ 16

2.4.5 GRAPH Button .......................................................................................................................... 16

2.4.5.1 During a Measurement ...................................................................................................... 16

2.4.5.2 After a Measurement ......................................................................................................... 16

2.4.6 FILTER Button ........................................................................................................................... 18

2.4.7 HELP Button .............................................................................................................................. 19

3. INSTRUMENT CONFIGURATION ......................................................................... 20

3.1 Adjusting the Brightness and Contrast ................................................................................................ 20

3.2 Selecting the Language ....................................................................................................................... 20

3.3 Choosing the Measurement of the Lead Compensation ..................................................................... 20

3.4 Configuring the Instrument (SET-UP) .................................................................................................. 21

3.4.1 Configuring the Instrument using the SET-UP Function ........................................................... 21

3.4.2 Configurable Parameters .......................................................................................................... 21

3.4.3 Resetting the Default Parameters ............................................................................................. 22

3.4.4 Measurement Parameters ......................................................................................................... 23

3.4.5 Adjustment of the Test Voltages ................................................................................................ 24

3.4.6 Adjustment of the Alarm Thresholds ......................................................................................... 25

4. OPERATION ........................................................................................................ 26

4.1 Charging the Batteries ......................................................................................................................... 26

4.2 Using the Leads ................................................................................................................................... 27

4.3 AC/DC Voltage Measurement .............................................................................................................. 27

2

Megohmmeter Models 6550/6555

4.4 Insulation Measurements ..................................................................................................................... 28

4.4.1 Description of the Measurement Principle ................................................................................ 28

4.4.2 Using a Fixed Voltage ................................................................................................................ 29

4.4.3 Using a Variable Voltage ............................................................................................................ 29

4.4.4 Using a Voltage Ramp ............................................................................................................... 30

4.4.5 Using a Stepped Voltage ........................................................................................................... 31

4.4.6 Connection ................................................................................................................................ 32

4.4.7 Before the Insulation Measurement .......................................................................................... 33

4.4.8 During the Insulation Measurement .......................................................................................... 34

4.4.9 After the Insulation Measurement ............................................................................................. 36

4.5 Error Indications ................................................................................................................................... 37

4.6 DAR (dielectric absorption ratio) and PI (polarization index) ............................................................... 37

4.6.1 DAR/PI Measurement ................................................................................................................ 38

4.6.2 Interpretation of the Results ...................................................................................................... 39

4.7 DD (dielectric discharge index) ............................................................................................................ 40

4.7.1 DD Measurement ...................................................................................................................... 40

4.7.2 Interpretation of Results ............................................................................................................ 41

4.8 Capacitance Measurement .................................................................................................................. 42

4.9 Measurement of the Residual Current ................................................................................................. 42

5. MEMORY FUNCTION .......................................................................................... 43

5.1 Recording a Measurement ................................................................................................................... 43

5.2 Reading Recorded Values .................................................................................................................... 45

5.3 Erasing the Memory ............................................................................................................................. 47

5.3.1 Erasing One Record .................................................................................................................. 47

5.3.2 Erasing All Records ................................................................................................................... 48

5.4 Error Codes .......................................................................................................................................... 48

6. DATAVIEW® SOFTWARE .....................................................................................49

6.1 Installing DataView ............................................................................................................................... 49

6.2 Connecting the Instrument to the PC .................................................................................................. 52

6.3 Megohmmeter Control Panel ............................................................................................................... 52

6.3.1 Opening the Control Panel ........................................................................................................ 52

7. SPECIFICATIONS ............................................................................................... 53

7.1 Reference Conditions .......................................................................................................................... 53

7.2 Electrical Specifications ....................................................................................................................... 53

7.2.1 Voltage .......................................................................................................................................53

7.2.2 Current....................................................................................................................................... 53

7.2.3 Insulation Resistance ................................................................................................................ 53

7.2.4 DAR, PI, and DD ........................................................................................................................ 58

7.2.5 Capacitance .............................................................................................................................. 58

Megohmmeter Models 6550/6555

3

7.3 Power Supply ....................................................................................................................................... 59

7.3.1 NiMH Technology ...................................................................................................................... 59

7.3.2 Battery Charger ......................................................................................................................... 59

7.3.3 Optimize Battery Charging ........................................................................................................ 60

7.3.4 Battery Life ................................................................................................................................ 60

7.3.5 “Defect” message .................................................................................................................... 60

7.4 Environmental Specifications ............................................................................................................... 61

7.5 Mechanical Specifications ................................................................................................................... 61

7.6 Safety Specifications ........................................................................................................................... 61

7.6.1 Electromagnetic Compatibility .................................................................................................. 62

7.6.2 Mechanical Protections ............................................................................................................ 62

7.7 Variations in the Domain of Use ........................................................................................................... 62

7.8 Inherent and Operating Accuracy ........................................................................................................ 62

8. MAINTENANCE .................................................................................................. 63

8.1 Recharging the Battery ........................................................................................................................ 63

8.2 Replacing the Battery .......................................................................................................................... 63

8.3 Replacing the Fuse .............................................................................................................................. 64

8.4 Cleaning ............................................................................................................................................... 64

8.5 Repair and Calibration ......................................................................................................................... 64

8.6 Technical and Sales Assistance ........................................................................................................... 64

8.7 Limited Warranty .................................................................................................................................. 65

8.8 Warranty Repairs ................................................................................................................................. 65

4

Megohmmeter Models 6550/6555

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.

Megohmmeter Model 6550 (Graphical, Analog Bargraph, Backlight, Alarm, Timer, 500V, 1000V,

2500V, 5000V, 10kV, Ramp, StepV, Variable, Auto DAR/PI/DD, USB, w/DataView® Software) ...... Cat. #2130.31

Megohmmeter Model 6555 (Graphical, Analog Bargraph, Backlight, Alarm, Timer, 500V, 1000V,

2500V, 5000V, 15kV, Ramp, StepV, Variable, Auto DAR/PI/DD, USB, w/DataView® Software) ..... Cat. #2130.32

Both models include set of 3 color-coded (red/blue/black) 9 ft (15kV ) integral leads and alligator clips (1000V
CAT IV), one 15kV jumper lead (blue), set of 2 color-coded test probes (red/black - 1000V CAT IV), optical
USB cable, 115V US power cord, 9.6V rechargeable NiMH batteries, small classic tool bag, and a USB stick
with DataView® software and a user manual.

1.1.1 Accessories and Replacement Parts

Replacement - Small classic tool bag ............................................................................................ Cat. #2133.72

Replacement - Optical USB cable ................................................................................................. Cat. #2135.41

Replacement - One 9.6V NiMH battery (two are required) ............................................................Cat. #2140.19

Replacement - Set of 3 color-coded (red/blue/black) 9 ft (15kV ) integral leads and

alligator clips (1000V CAT IV).......................................................................................................... Cat. #2151.14

Replacement - 15kV jumper lead (blue) ......................................................................................... Cat. #2151.15

Replacement - Set of 2, color-coded (red/black) test probes (1000V CAT IV) ............................... Cat. #2152.23

Replacement - 115V US power cord ............................................................................................. Cat. #5000.14

Lead - Set of 3 color-coded (red/blue/black) 9 ft shielded safety leads with hippo clips (15kV) ... Cat. #2151.17

Lead - One shielded safety lead (black) 25 ft with hippo clips (15kV) ............................................ Cat. #2151.18

Lead - One shielded safety lead (blue) 25 ft with hippo clips (15kV) ............................................. Cat. #2151.19

Lead - One shielded safety lead (red) 25 ft with hippo clips (15kV) ............................................... Cat. #2151.20

Lead - One shielded safety lead (black) 45 ft with hippo clips (15kV) ............................................ Cat. #2151.21

Lead - One shielded safety lead (blue) 45 ft with hippo clips (15kV) ............................................. Cat. #2151.22

Lead - One shielded safety lead (red) 45 ft with hippo clips (15kV) ............................................... Cat. #2151.23

Power cord - 240V EU .................................................................................................................... Cat. #5000.32

DataView Software Updates are Available at www.aemc.com

Megohmmeter Models 6550/6555

5

2. PRODUCT FEATURES

2.1 Description

The Megohmmeter Models 6550 and 6555 are high-end portable measuring instruments capable of measuring
very high electrical insulation and resistance values. They are packaged in a rugged IP 54 rated case, have a
graphical LCD screen and can operate on battery or AC power.

The Model 6550 makes insulation measurements at voltages up to 10,000V, the Model 6555 up to 15,000V.

Their main functions are:

■ detection and measurement of input voltage, frequency, and current

■ quantitative and qualitative insulation measurement:

- measurement at a fixed test voltage of 500V, 1000V, 2500V, 5000V, 10,000V or 15,000VDC

- measurement at an adjustable test voltage from 40 to 15,000VDC

- measurement with a voltage ramp selectable in the ranges from 40 to 1100V or from 500 to 15,000V

- measurement with a voltage in steps from 40 to 15,000V with up to 10 steps and dwell times

- non-destructive (Early Break) test, test stopped at a preset current (Break at I-limit) or Burning

- calculation of the DAR, PI, and DD (dielectric discharge index) quality ratios

- calculation of the temperature corrected resistance

■ measurement of the capacitance of the circuit tested

■ measurement of the residual current

These megohmmeters contribute to the safety of electrical installations and equipment.

Their operation is managed by microprocessors that acquire, process, display, and store the measurements.

They have many advantages, such as:

■ digital filtering of insulation measurements

■ measurement of the voltage

■ programming of thresholds to trigger audible alarms

■ time controlled measurements

■ current limit programming

■ plotting of resistance, voltage, and current vs. time and current vs. voltage: R(t), V(t), I(t), and I(V)

■ fuse protection, with defective fuse indication

■ automatic discharge of the test voltage at the end of the measurement provides operator safety

■ auto power off mode to save battery power

■ battery charge condition indication

■ large graphical display with backlight capability

■ data storage of measurements

■ real-time clock, and a USB interface

■ configuration, real-time testing and data export to a PC (using the included DataView® software)

6

Megohmmeter Models 6550/6555

2.2 Front Panel Features

2 3 4

1000V CAT III

600V CAT IV

( 2500V )

110-230V 50/60 Hz

80 VA max

SET-UP

MR

Step

Voltage

V RAMP

V VAR

V FIXED

OFF

5

1

6

TEMP

HELP

ALARM

MEM

CONFIG

FILTER

DISPLAY

GRAPH

START

STOP

15

kV MEGOHMMETER

MODEL 6555

7

8

1

Safety connection terminals “+”, “G” and “-”.

2

Graphical, digital LCD (see § 2.3).

3

Power receptacle for recharging the batteries.

4

USB connection for communication with a PC.

5

Seven-position rotary function switch.

6

Navigation buttons for moving the cursor, selecting and changing values.

7

START/STOP measurement button.

8

Eight function buttons (see § 2.4).

Megohmmeter Models 6550/6555

7

2.3 Display

The display is a graphical, digital LCD with a resolution of 320 x 240 pixels. It has built-in backlight, which can
be controlled by a long press on the HELP/ button.

2.3.1 Example of Display Before Measurement

The alarm is enabled

No stop at current limit

Test with programmed duration

The blinking value can be modified

using the navigation arrow keys

Value of the next lowest

available test voltage

Value of the external voltage present

on the terminals and its frequency

Current flowing between the terminals

500 V 2500 V

Input voltage
Frequency
Input current

FIXED VOLTAGE

1000 V

Test Run Time 00:02:00

Date 2011.05.23

2.3.2 Example of Display During Measurement

The measurement smoothing filtering is

active, with a time constant of 20 seconds

Value of the insulation resistance

The voltage generated is >70V

and therefore, dangerous

True value of the test voltage

Value of the insulation resistance

on the bargraph

DC

984 V

kΩ

10

DF 20s

303.3 MΩ

Elapsed Time 00:00:48

100

MΩ

1

10

100

1

ALARM

BURN

-0.1 V DC

0.2 Hz

112 pA

Time 10:31

ALARM I-LIM

3.244 µA

TΩ

1

10

10

GΩ

100

Battery power level status

Measurement function

Value of the next highest
available test voltage

Programmed duration of the test

Date and Time

Stop at current limit

Current flowing between the terminals

Elapsed time since the beginning
of the measurement

2.3.3 Example of Display After Measurement

The measurement range is fixed

Value of the insulation resistance

True value of the test voltage at

the end of the measurement

Subsidiary results

The symbol indicates blinking.
If values are undetermined, they are represented by - - - -.

8

RANGE

995 MΩ

528 V

Elapsed Time 00:01:12

DAR (30s/60s)
PI (1.0m/10m)
Capacitance

E-BRKALARM

531 nA

1.00

---

2.201 nF

The insulation resistance is below the
alarm threshold

The type of measurement is a
non-destructive test

Current at the end of the measurement

Duration of the measurement

Megohmmeter Models 6550/6555

2.4 Button Functions

If the audible signal has not been deactivated in SET-UP (see § 3.4), the instrument confirms each button press
by an audible beep. If the beep has higher frequency, this indicates that pressing the button is prohibited and
will have no effect.

A long press (press maintained for more than two seconds) is confirmed by a second audible beep.

BUTTON DESCRIPTION

TEMP

ALARM

• Enter temperature and humidity information and calculate temperature corrected resistance

• Enables/Disables the alarms

HELP /

MEM

CONFIG

DISPLAY

FILTER

GRAPH

• Displays Help information; Enables/Disables the backlighting of the display

• Stores the measurements

• Configuration of the measurement parameters

• Switch between screens

• Smoothing of the measurements

• Switch graph mode ON/OFF

2.4.1 TEMP BUTTON

This function is accessible only when the measurement is completed for V-VAR and V-FIXED only. It is used to
reference the measurement result to a temperature other than the one at which the measurement was made.

Temperature causes the resistance to vary according to a quasi exponential law. To a rough approximation,
raising the temperature by 18°F (10°C) halves the insulation resistance; conversely, lowering the temperature by
18°F (10°C) doubles the insulation resistance.

Comparing measurements to a single reference temperature makes it easier to evaluate insulation resistance
measurements taken at different times and temperatures.

Similarly, measuring the humidity improves the correlation between the various measurements made on a given
device.

Procedure:

■ Make a measurement in V-FIXED or V-VAR mode.

■ Press the TEMP button.

R measured

TEMP

Megohmmeter Models 6550/6555

Rc at --- °C

TEMPERATURE
Air Temperature
Humidity
Probe Temperature
Rc Reference Temperature
∆T for R/2

--- °C

--- %

--- °C

--- °C

--- °C

5.00 GΩ

--- kΩ

9

Use the ◄ ►▲▼ arrow buttons to enter the various parameters:

■ Air Temperature: the ambient temperature (optional).

■ Humidity: the ambient relative humidity (optional).

■ Probe Temperature: the temperature of the device tested. If it has not warmed up during the

measurement, it is equal to the ambient temperature.

■ Rc Reference Temperature: the temperature to which the measured resistance will be referred.

■ ∆T for R/2: the temperature variation, known or estimated, sufficient to halve the insulation resistance.

To facilitate the programming, the instrument proposes default values.

The instrument then displays the insulation resistance referred to the reference temperature.

TEMPERATURE
Air Temperature
Humidity
Probe Temperature
Rc Reference Temperature
∆T for R/2

R measured
Rc at 40 °C

23 °C

40%
23 °C
40 °C
10 °C

5.00 GΩ

1.529 GΩ

If coefficient ∆T for R/2 is not known, it can be calculated from a minimum of 3 measurements made on the
same device at different temperatures.

Detail concerning the calculation performed:

The insulation resistance varies with the measurement temperature. This dependence can be approximated by
an exponential function:

Rc = Kt * Rt

where Rc: insulation resistance referred to 40°C

Rt: insulation resistance measured at temperature T

Kt: coefficient defined as follows:
Kt = (1/2) ^ ((40 - T)/∆T)
where ∆T: temperature difference at which the insulation resistance is halved

2.4.2 ALARM Button

Press the ALARM button to enable the alarm defined using the CONFIG button (see 2.4.3) or in
SET-UP (see § 3.4). The ALARM symbol is then displayed.

If the measurement is less than the alarm threshold, the instrument indicates this by blinking the
ALARM symbol on the display and emitting an audible signal.

10

ALARM

Press the ALARM button again to disable the alarm; the ALARM symbol disappears from the
display.

Megohmmeter Models 6550/6555

2.4.3 CONFIG Button

2.4.3.1 Before the Measurement

If the V-FIXED or V-VAR. test voltages have been chosen, there are two configuration screens. There is only one
for the V-RAMP and V-STEP test voltages.

Press the CONFIG button (press CONFIG again to exit):

CONFIG

Total Run Time ---

Manual Stop

Manual Stop + DD
Timed Run (m:s) 2:00
Timed Run + DD
DAR (s/s) 30/60
PI (m/m) 1.0/10

CONFIG

■ Manual Stop: measurements are stopped manually.

■ Manual Stop + DD: measurements are stopped manually and dielectric discharge ratio (DD) is

calculated at the end of the programmed duration.

■ Timed Run + DD: measurement is automatically stopped at the end of the programmed duration and
dielectric discharge ratio (DD) is calculated.

■ DAR: measurement is automatically stopped at the end of one minute
(or of the programmed time, if different).

■ PI: measurement is automatically stopped at the end of 10 minutes
(or of the programmed time, if different).

It is always possible to stop a measurement during a test with programmed duration by pressing the START/
STOP button.

The ▲▼ arrow buttons are used to select the measurement
configuration.

CONFIG

When Timed Run (test with programmed duration) or Timed Run + DD is selected, the duration of the measure­ment (m:s) can be set.

CONFIG

Total Run Time 00:02:00

Manual Stop
Manual Stop + DD

Timed Run (m:s) 2:00

Timed Run + DD
DAR (s/s) 30/60

To do this, use the ◄ ►▲▼arrow buttons.

PI (m/m) 1.0/10

Megohmmeter Models 6550/6555

11

The test will run for the time programmed. However, if, during the measurement, the rotary switch position is
changed or the START/STOP button is pressed, the measurement will stop.

Press the DISPLAY button to
see the second configuration
screen.

DISPLAY

The second configuration screen depends on the rotary switch setting.

The V-RAMP and V-STEP settings only use the second page of the configuration screen.

The second configuration screen is used to choose:

■ The type of test (Test Type)

■ Nondestructive test (Early Break)

The measurement will be stopped at the first breakdown current peak detected. This type of test is used for
non-destructive tests. The current is limited to 0.2mA.

The E-BRK symbol is displayed.

Test Type

Maximum Ouput Current
I-Range
Disturbance Level
2500V

CONFIG

Burn-in

1 mA

Auto(2)

Low

< 2.5 M

The ▲▼ arrow buttons are used to
select and modify a parameter.

Ω

E-BRK

FIXED VOLTAGE

500 V 2500 V

Input voltage
Frequency
Input current
Date 2011.05.23

■ Stopping the test at a preset current (Break at I-limit)

The measurement will be stopped when the current reaches the maximum value (Maximum Output Current)
defined by the user (see below). This type of test is useful for testing varistors or other types of voltage limiter.

The I-LIM symbol is displayed.

500 V 2500 V

1000 V

10 V AC

50.0 Hz

24.6 pA

Time 10:31

I-LIM

FIXED VOLTAGE

1000 V

12

Input voltage
Frequency
Input current
Date 2011.05.23

10 V AC

50.0 Hz

24.6 pA

Time 10:31

Megohmmeter Models 6550/6555

■ Burning

The measurement is not stopped depending on the current. Depending on the application, this type of test can
be used to determine the location of insulation faults when there is Burning: appearance of an electric arc during
the test or burn spot after the test.

The BURN symbol is displayed.

BURN

FIXED VOLTAGE

500 V 2500 V

Input voltage
Frequency
Input current
Date 2011.05.23

■ The Maximum Current (Maximum Output Current)

This is the current not to be exceeded in any type of test. (In the test type Break at I-limit the measurement is
stopped if this value is reached.).

Use the ▲▼ arrow buttons to set it between 0.2 and 5mA for test types Burning and Break at I-limit. For test
type Early break this value is fixed to 0.2mA.

■ The Current Range (I-range)

This function is used to make measurements more rapidly when their order of magnitude is already known.

Use the ▲▼ arrow buttons to set the value to Auto or Range 1, 2 or 3.

1000 V

10 V AC

50.0 Hz

24.6 nA

Time 10:31

Current < 300nA 60nA < I < 50µA 10µA < I < 6mA

Current range

For example for VN = 10,000V :

Current range 1 2 3

Resistance

*10MW because Imax = 1mA at 10,000V.

The fixed current range remains active until the instrument is switched off.

Megohmmeter Models 6550/6555

1 2 3

R > 30GW 200MW < R < 16,6GW 10MW* < R < 1 GW

13

The RANGE symbol is displayed.

RANGE

FIXED VOLTAGE

500 V 2500 V

Input voltage
Frequency
Input current
Date 2011.05.23

■ Interference of the Signal (Disturbance Level)

Use the ▲▼ arrow buttons to set the value, from Low to High. The DH symbol is then displayed.

500 V 2500 V

Input voltage
Frequency
Input current
Date 2011.05.23

1000 V

Time 10:31

DH

FIXED VOLTAGE

1000 V

Time 10:31

BURN

10 V AC

50.0 Hz

24.6 nA

10 V AC

50.0 Hz

24.6 nA

The High setting is recommended when measurements are made in the presence of strong electromagnetic
fields at the network frequency (for example near high-voltage lines).

■ In the V-FIXED and V-VAR Modes: the alarm threshold

Use the ▲▼ arrow buttons to set the alarm threshold.
The alarm threshold can also be set in SET-UP (see § 3.4).

The ALARM symbol is displayed if the alarm is enabled.

ALARM

FIXED VOLTAGE

500 V 2500 V

Input voltage
Frequency
Input current
Date 2011.05.23

1000 V

Time 10:31

BURN

10 V AC

50.0 Hz

24.6 nA

14

Megohmmeter Models 6550/6555

■ In the V-RAMP mode: the programming of the ramp (Set Ramp Function)

Use the ▲▼ arrow buttons to go to Set Ramp Function; the instrument displays the voltage ramp values
programming screen. This programming can also be done in SET-UP (see § 3.4).

■ In the V-STEP mode: the programming of the step (Set Step Function)

Use the ▲▼ arrow buttons to go to Set Step Function; the instrument displays the voltage step values
programming screen. This programming can also be done in SET-UP (see § 3.4).

2.4.3.2 During the Measurement

During the measurement (for V-VAR and V-FIXED), the CONFIG button is used to choose the current range:
automatic (default) or fixed. For more details, refer to the previous section.

■ Once the measurement has started, press the CONFIG button. The following screen appears:

BURN

502 MΩ

502 V

I-Range
Disturbance Level

Set 500V

Elapsed Time 00:00:12

CONFIG

978 nA

Auto(2)

Low

CONFIG

■ Use the ◄ ►▲▼ arrow buttons to modify the measurement current range. Changes are applied and
saved immediately after entry.

■ Confirm and exit by pressing the CONFIG button again.

■ If the range is fixed, the RANGE symbol is displayed.

■ The choice remains active until the rotary switch is moved to another position.

During the measurement, it is also possible to turn the analog filter ON/OFF (Disturbance Level). For more
details, refer to the previous section.

In the case of a variable test voltage, the voltage set is also displayed and can be modified during the
measurement.

RANGE

BURN

502 MΩ

2305 V

I-Range
Disturbance Level
Adjustable Voltage

Set 2300V

Elapsed Time 00:00:12

CONFIG

4.61 µA

Fix 2

Low

2300 V

Megohmmeter Models 6550/6555

15

2.4.4 DISPLAY Button

This button is used to browse through the various accessible screens containing all information available
before, during or after the measurement. Depending on the measurement mode and the configuration chosen
(CONFIG button), the screens are different.

2.4.5 GRAPH Button

During the measurement, and at the end of each measurement, pressing the GRAPH button displays a
graphical presentation of the measurement results. On the first screen, the insulation resistance vs. time R(t)
and the voltage vs. time V(t) are shown.

Minimum and maximum values of the
voltage and the resistance and time
at the location of the cursor

Test voltage axis

Curve V(t), identified by x's

Insulation resistance axis

508 V
508 V

MΩ

3050

3000

GRAPH

3.018 GΩ

3.018 GΩ

00:01:00
00:01:00

V

510

500

Curve R(t)

Time axis

2950

2900

2850

0 1:00 2:00 3:00 4:00

490

480

470

This curve is plotted using samples recorded during the measurement.

2.4.5.1 During a Measurement

There is no cursor. Each new measurement result is automatically added to the curve and its values are
shown in one line above the graphical area.

2.4.5.2 After a Measurement

The time indication in the upper right of the screen is blinking, this is the indication for cursor mode.

The ◄ ► arrow buttons can be used to move the time cursor along the curve. The minimum and maximum
values at the cursor position are shown in two lines above the graph area. If the time span on the time axis is
4 minutes (which is the smallest possible) these lines are the same and represent one sample.

Depending on the range of the left vertical scale it may be possible to move the vertical scale and the
corresponding curve with the ▲▼ arrow buttons.

16

Megohmmeter Models 6550/6555

The following is an example of the display when a measurement is performed in V-RAMP or V-STEP mode:

GRAPH

497 V
497 V

GΩ

10.0

7.5

5.0

2.5

0

0 1:00 2:00 3:00 4:00

3.045 GΩ

3.045 GΩ

00:00:25
00:00:25

V

1000

750

500

250

0

193 V
193 V

GΩ

10.0

7.5

5.0

2.5

0

0 1:00 2:00 3:00 4:00

GRAPH

2.996 GΩ

2.996 GΩ

00:00:17
00:00:17

V

1000

750

500

250

0

If the interval of the scale of an axis is big enough, it may be possible to zoom.

Press the CONFIG button.

■ The time indication in the upper right of the screen stops blinking, this is the indication for zoom mode.

■ The ◄ ► arrow buttons are used to modify the time scale of the graph.

■ The ▲▼ arrow buttons are used to modify the resistance scale of the graph.

Press the DISPLAY button to view the current vs. time curve.

GRAPH

DISPLAY

Axis of the current

Curve R(t)

Time axis

2.985 GΩ

2.985 GΩ

nA

170

165

160

155

150

0 1:00 2:00 3:00 4:00

167.8 nA

167.8 nA

00:02:00
00:02:00

Minimum and maximum values of the
current at the position of the cursor

Press the DISPLAY button again to view the current vs. voltage data points (not available for V-STEP).

GRAPH

nA

700

600

500

400

300

DISPLAY

0 1 2 3 4kV

This curve is useful primarily in the case of a measurement in V-RAMP mode.

There is no cursor and it is not possible to zoom on this curve.

Megohmmeter Models 6550/6555

17

2.4.6 FILTER Button

303.3 MΩ

984 V

Elapsed Time 00:00:48

DH

ALARM

I-LIM

3.244 µA

10

kΩ

100

MΩ

1

10

100

GΩ

1

100

10

TΩ

1

10

The FILTER button can be used to activate and deactivate a digital filter for the insulation measurements. This
filter affects only the displayed results (which are smoothed), not the measured values. The recorded data
therefore remains raw (no filter).

This function is useful in the case of high instability of the insulation values displayed, but it is also possible to
estimate the measurement on the bargraph.

Once the measurement starts, if interference is present, press the FILTER button. Start by applying the DF10s
filter. If that is not enough, go to the DF20s filter, then to the DF40s filter. The larger the time constant, the
smoother (and slower) the measurement.

Successive presses on the FILTER button will modify or remove the filter:

■ DF 10: time constant 10 seconds

■ DF 20: time constant 20 seconds

■ DF 40: time constant 40 seconds

■ no filter

The filter is calculated as follows:

RN = RN-1 + (R - R

N-1

)/N

If N is set to 20, the time constant of this filter will be approximately 20 seconds.

DH

FIXED VOLTAGE

500 V 2500 V

Input voltage
Frequency
Input current
Date 2011.05.23

1000 V

10 V AC

50.0 Hz

24.6 nA

Time 10:31

Selecting digital filtering (DF) is recommended for measurements of fluctuating high insulation resistance values.
Such fluctuations may be due to hand movement, when touching the cables, fluctuating capacitances in the
device tested, insulation that varies because of conducting dust, an ionizing and polarizing effect of this dust,
etc., or again to the presence of an AC voltage superposed on the measurement.

The FILTER button is active before and during the measurement (but is not available in graph mode).

18

Megohmmeter Models 6550/6555

2.4.7 HELP Button

A short press on the HELP button opens the help function, in which the actions of the buttons are explained.

This operation changes with the context: setting of the switch, operating mode, before, during, or after a
measurement. Below is an example in V-FIXED mode:

Help

DISPLAY: next page

GRAPH: graph R(t)+V(t), I(t), I(V)

CONFIG: configuration menu

FILTER: 3 digital filters DF, off
ALARM: alarm on/off
MEM: store data record menu

TEMP: temperature menu

, : select test voltage

HELP

A long press on the HELP button (>2s) allows setting of the display contrast and the backlighting (see § 3.1).

- lower - higher

Megohmmeter Models 6550/6555

19

3. INSTRUMENT CONFIGURATION

3.1 Adjusting the Brightness and Contrast

■ Press the HELP button for

CONTRAST & BACKLIGHT

more than two seconds.

■ Press the ◄► buttons to
adjust the contrast.

Display Contrast

■ Press the ▲▼ buttons to
adjust the brightness.

■ Press the HELP button to exit.

HELP HELP

Backlight

These adjustments are stored even
after the instrument is switched off.

3.2 Selecting the Language

NOTE: The language selection is only available in instruments manufactured after January 2014.

To select the language, press the CONFIG button and hold it down while turning the switch from OFF to SET-UP.

SET-UP

MR

Step

Voltage

+

CONFIG

V RAMP

V VAR

V FIXED

OFF

3.3 Choosing the Measurement of the Lead Compensation

The lead compensation is only possible if the internal firmware version allows it and only with the red lead that
is shipped with the instrument (k22 is marked at each end). For the most recent firmware, visit www.aemc.com.

To select the lead compensation, press the FILTER button and hold it down while turning the switch from OFF
to SET-UP.

SET-UP

MR

Step

Voltage

V RAMP

V VAR

V FIXED

OFF

Megohmmeter Models 6550/6555

20

+

FILTER

3.4 Configuring the Instrument (SET-UP)

The Models 6550/6555 are factory configured so that they can be used without modifying the parameters.
For most measurements, simply choose the test voltage and press the START/STOP button.

Most parameters can be configured using the CONFIG button or in the SET-UP function.

■ The SET-UP function allows overall configuration of the instrument independently of which
measurement functions are chosen.

■ The CONFIG button allows configuration of the chosen measurement function before and during a
measurement.

A configuration modified in one of these two ways is updated for both (SET-UP function or CONFIG button).

3.4.1 Configuring the Instrument using the SET-UP Function

■ Turn the rotary switch to the
SET-UP position.

■ Select and modify a parameter,
using the ▲▼◄ ► buttons.

SET-UP

MR

Step

Voltage

V RAMP

V VAR

V FIXED

OFF

Set Default Parameter
Buzzer
Power Down
Baud rate
Date
Time
Temperature Unit

General Settings

Instrument Number
Firmware

3.4.2 Configurable Parameters

■ Buzzer: Sets the audible level of beeps: 1, 2, 3, or Off (no sound).

■ Auto Power OFF (power management):

On (instrument will turn off after 5 minutes of no activity), Off (instrument will not turn off automatically).

■ Baud Rate: Sets the data rate of the serial interface to 9600, 19200, 38400 or 57600 bauds.

■ Date: Sets the date in yyyy-mm-dd format.

1

On

38400

2011-05-25

9:41

Celsius

100213

1.0.00

■ Time: Sets the time in hh:mm format.

■ Temperature Unit: Chooses the temperature unit: Celsius or Fahrenheit.

■ Instrument Number: Indicates the number of the instrument. This line is informative and cannot be

modified.

■ Firmware: Indicates the two version numbers of the firmware in the instrument. This line is informative
and cannot be modified.

Megohmmeter Models 6550/6555

21

3.4.3 Resetting the Default Parameters

To return to the initial configuration, choose Set Default Parameter.

The instrument requests confirmation.

SET-UP

! WARNING !

All parameters

will be reset !

O.K.
CANCEL

If you choose OK, the following default parameters will be reset:

■ Audible level of the buzzer: 1

■ Auto Power OFF: will be set to OFF

■ Data rate: 38,400 baud

■ Programmed measurement duration: 2 minutes

■ Sampling duration: 10 seconds

■ DAR: 30/60 and PI: 1/10

■ Test type: Burning

■ Maximum output current: 5mA

■ Maximum output voltage: 10kV (6550), 15kV (6555)

■ Adjustable test voltages: 50V, 800V and 7000V

■ Ramp and step test voltages return to their original values, as do all alarm thresholds

■ The backlight will be turned off

22

Megohmmeter Models 6550/6555

3.4.4 Measurement Parameters

Press the DISPLAY button to see the following:

Timed Run: Set the measurement duration

(in minutes:seconds) for measurements with
programmed duration.

- The adjustment range is from 00:01 to 99:59,
in 1-second steps.

DAR: Set the time at which the measurements must
be recorded to calculate the DAR (see § 4.6).
This can be used in special applications.

- The first time can be set from 10 to 90 seconds in
5-second steps.

- The second time can be set from 15 to 180 seconds
in 5-second steps.

PI: Set the time at which the measurements must be
recorded to calculate the PI (see § 4.6). This can be
used in special applications.

- The first time can be set from 0.5 to 30 minutes in

0.5- then 1-minute steps.

- The second time can be set from 0.5 to 90 minutes
in 0.5-, 1-, and 5-minute steps.

DISPLAY

Test Timing
Timed Run (m:s)
DAR (s/s)
PI (m/m)

2:00

30/60

1.0/10

Press the DISPLAY button to see the following:

Test Type: Choose the type of test: Burning,

Early-Break, or Break at I-Limit.

Maximum Output Current: Set the maximum
output current, from 0.2 to 5mA.

Maximum Output Voltage: Set the maximum
output voltage. This can be useful to prevent
handling errors, thus making it possible to
entrust the instrument to less experienced
users for particular applications (e.g. telephone,
aviation, etc.) where it is important not to
exceed a maximum test voltage.

Example: If the maximum voltage is set to
750V, the measurement will be made at 500V
for the 500V fixed voltage, and at a maximum
of 750V for all other fixed voltages.

The adjustment range is from 40 to 10,000V
(15,000V for Model 6555).

DISPLAY

Test Parameters
Test Type
Maximum Output Current
Maximum Output Voltage
Adjustable Voltage 1
Adjustable Voltage 2
Adjustable Voltage 3

Burn-in

5.0 mA

15000 V

50 V

500 V

2500 V

Megohmmeter Models 6550/6555

23

3.4.5 Adjustment of the Test Voltages

Always on the third SET-UP screen.

Adjustable Voltage 1, 2, and 3: Set the values of the 3 adjustable test voltages.

The adjustment range is from 40 to 15,000V.

Press the DISPLAY button to see the following:

Step & Ramp Functions
Set Step Function 1
Set Step Function 2
Set Step Function 3
Set Ramp Function 1
Set Ramp Function 2
Set Ramp Function 3

DISPLAY

Set Step Function 1, 2, and 3: In the case of a measurement with a stepped voltage, used to set the voltages
and the durations of the steps.

Pressing the ► button opens the following screen. Press the DISPLAY button to view the rest of the steps.

Step & Ramp Functions

Step Function 1

Step Voltage Duration (m:s)

1
2
3
4
5

50 V
100 V
150 V
200 V
250 V

Total Run Time (m:s)

You can then set the voltage and duration of each of the 10 steps. The total duration of the measurement (Total
Run Time) is calculated by the instrument.

The adjustment range of the voltages is from 40 to 15,000V.

The duration of the steps ranges from zero or 0:01 to 99:59. If a duration is set to zero, the time displayed is -:--.
A duration below 30 seconds is not very useful because acquiring a stable resistance result requires some time.

If either a step voltage or a step duration is set to zero, the step will be set to zero as a whole and will be skipped
during the test.

0:10
0:10
0:10
0:10
0:10
1:40

DISPLAY

Step & Ramp Functions

Step Function 1

Step Voltage Duration (m:s)

6
7
8
9
10

300 V
350 V
400 V
450 V
500 V

Total Run Time (m:s)

0:10
0:10
0:10
0:10
0:10
1:40

24

Megohmmeter Models 6550/6555

Set Ramp Function 1, 2, and 3: In the case of a measurement with a ramped voltage, used to set the starting
voltage, the slope of the ramp, and the final voltage.

Pressing the ► button opens the following screen:

Step & Ramp Functions

Ramp Function 1

Step Voltage Duration (m:s)

Start
Ramp
End

50 V

100 V

0:10
0:10
0:10

Total Run Time (m:s)

You can then set the voltage and duration of the starting level and of the final level, along with the duration of
the ramp. The total duration of the measurement (Total Run Time) is calculated by the instrument.

The voltages can be adjusted in two ranges: between 40V and 1100V or between 500V and 15,000V.

The duration of the steps can range from Start 0:30, Ramp 0:10, End 0:10 to 99:59.

Press the ◄ arrow button to exit the menu and go back to the main menu.

0:30

3.4.6 Adjustment of the Alarm Thresholds

Press the DISPLAY button to see the following:

An audible alarm is triggered for voltages below the
following alarm thresholds. There is one for each fixed
or adjustable voltage and all of them can be modified.

- For a test voltage of 500V, the alarm threshold is

adjustable from 10kW to 2TW.

- For a test voltage of 1000V, the alarm threshold is

adjustable from 10kW to 4TW.

- For a test voltage of 2500V, the alarm threshold is

adjustable from 10kW to 10TW.

- For a test voltage of 5000V, the alarm threshold is

adjustable from 10kW to 15TW.

- For a test voltage of 10,000V, the alarm threshold

is adjustable from 10kW to 25TW.

- For a test voltage of 15,000V, the alarm threshold

is adjustable from 10kW to 30TW.

- For the adjustable test voltages, the alarm
threshold depends on the voltage. It is adjustable
between two values that depend on the test
voltage.

DISPLAY

500 V
1000 V
2500 V
5000 V
10000 V
15000 V
Adjustable Voltage 1
Adjustable Voltage 2
Adjustable Voltage 3

Alarm Settings

< 500 kΩ
< 1.0 MΩ
< 2.5 MΩ
< 5.0 MΩ
< 10 MΩ
< 15 MΩ

< 50 kΩ

< 100 kΩ

< 250 kΩ

Press the DISPLAY button again to return to the first
SET-UP screen.

Megohmmeter Models 6550/6555

25

4. OPERATION

4.1 Charging the Batteries

NOTE: When using the instrument for the first time, start by fully charging the batteries. Charging must be
conducted at a temperature between 32° and 86°F (0° and 30°C).

To charge the batteries:

1. Set the rotary switch to the OFF position.

2. Connect the power cord.

SET-UP

MR

Step

Voltage

V RAMP

V VAR

V FIXED

OFF

During the charging, the instrument displays the following information:

Battery 1

Battery 2

2%

12.4 V

1953 mA

26.4°C

00:05:30

3%

11.7V

13 mA

26.7°C

00:05:20

Charging

The percentage charge of each of the batteries, their voltages, their
charging currents, their temperatures, and the charging times.

To reduce the power to be supplied and make it possible to use the
instrument during the charging, the batteries are charged alternately
at 2A for 10 seconds. It is for this reason that the charging current
varies.

The text on the side indicates:

■ Charging = battery being charged

■ Full = battery fully charged

■ Cold = battery too cold to be charged

■ Hot = battery too hot to be charged

■ Defect = battery faulty (must be replaced)

> 90 VAC

< 260 VAC

50/60 Hz

Charging time: Between 6 and 10 hours, depending on the initial charge condition.

When the instrument is switched-on, the battery state information is accessible by pressing the HELP button
followed by TEMP button. Following prolonged storage, the batteries may be completely discharged. In this
case, the first charge may take longer.

It is possible to charge the instrument during operation. In this case the symbol flashes.

The charging current then depends on the test voltage and on the resistance measured. If the power necessary
for the measurement approaches 10W, the batteries are not charged.

26

Megohmmeter Models 6550/6555

4.2 Using the Leads

Specific leads are supplied with the instrument. To use them, attach either the test probes or alligator clips
(supplied with the instrument).

NOTE: These accessories have hand guards. For safety reasons, the user’s hands must always be behind
the hand guard.

Always keep hands behind this protective guard:

• Voltages ≤1000V

• Insulation using a test voltage ≤ 5000V

15 kV max

15 kV max

• On insulation measurements with a test voltage ≥ 5000V

Measurements of voltages ≥1000V on supply lines should be made using the test probes only, with the user’s
hands behind the hand guard on the lead.

WARNING: The leads with large clips (automobile battery charger type) proposed as accessories should
not be used for line voltage measurements because their jaws are not insulated.

4.3 AC/DC Voltage Measurement

Turning the switch to any insulation measurement position (V-FIXED, V-VAR, V-RAMP, or V-STEP) sets the
instrument to AC/DC voltage measurement. The voltage between the input terminals is measured at all times
and indicated as RMS value on the display unit: Input Voltage. Switching between AC and DC mode is auto­matic.

In the case of an AC signal, the instrument measures the frequency. It also measures the residual DC current
between the terminals of the instrument. This measurement is used to evaluate its impact on the insulation
measurement about to be made.

The insulation measurements cannot be started if there is an excessively high external voltage (>0.4VN where
VN is the test voltage, with a maximum of 1000VAC) on the terminals.

Megohmmeter Models 6550/6555

27

FIXED VOLTAGE

BURN

-- V

500 V

Input voltage
Frequency
Input current
Date 2011.05.23

When the external voltage exceeds 25V, the blinking ( ) symbol is displayed alongside it.

NOTE: By pressing the DISPLAY button, the screen can be switched to a big numerical indication of the
input voltage and its bargraph.

The only errors possible in a voltage measurement are:

■ The frequency is outside the measurement range (see § 7.2.1)

■ The voltage is outside the measurement range (see § 7.2.1)

1000 V

230 V AC

50.0 Hz

24.6 nA

Time 10:31

4.4 Insulation Measurements

Insulation measurements are made on objects that are de-energized.

This measurement varies greatly with the temperature and the relative humidity. It is

therefore essential to measure them with a separate device and to record them with the
insulation value.

%

For example, for a motor that operates on a 230V supply, the test will be performed at 500V.

The ambient temperature can be entered in the instrument and stored with the measure­ment results.

The value of the test voltage is generally twice the voltage at which the object to be
tested is used, unless a standard stipulates otherwise.

4.4.1 Description of the Measurement Principle

The instrument generates a DC test voltage equal to the chosen nominal voltage VN between the + and - ter­minals. More precisely, the value of this voltage depends on the resistance to be measured (see the curves of §

7.2.3). The instrument measures the voltage and the current between the two terminals and from them deduces
R=V/I.

The instrument measures the external voltage present on the terminals. It can make the measurement if the
peak voltage is less than 0.4VN or 1000VAC maximum. Beyond this value, it does not make the measurement.

28

Megohmmeter Models 6550/6555

4.4.2 Using a Fixed Voltage

Set the switch to the V-FIXED position. The following screen appears:

FIXED VOLTAGE

BURN

SET-UP

MR

Step

Voltage

V RAMP

V VAR

V FIXED

OFF

-- V 1000 V

Input voltage
Frequency
Input current
Date 2011.05.23

500 V

10 V AC

50.0 Hz

24.6 pA

Time 10:31

Use the ◄ ► ▲▼ buttons to select the test voltage: 500V, 1000V, 2500V, 5000V, 10,000V or 15,000VDC.

The instrument generates exactly the selected voltage when the measured resistance is high. When the
measured resistance is low, the output voltage decreases because of a voltage drop on a series resistance of
234kW internal to the instrument.

For example, if a test with 1000V should be performed, use the V-VAR function and adjust V so that the dis­played voltage during measurement is 1000V (set voltage will be higher by a term Im * 234kW) - see § 2.4.3.2.

4.4.3 Using a Variable Voltage

Set the switch to the V-VAR position. The following screen appears:

BURN

ADJUSTABLE VOLTAGE 1

50 V

SET-UP

MR

Step

Voltage

V RAMP

V VAR

V FIXED

OFF

There are already 3 preset voltages that can be modified in SET-UP (see § 3.4). Use the ▲▼ buttons to select
one of them:

■ Adjustable Voltage 1: 50V

■ Adjustable Voltage 2: 800V

■ Adjustable Voltage 3: 7000V

Otherwise, use the ◄► buttons to go to the voltage value, then use the ▲▼ buttons to adjust the value of the
test voltage. The adjustment is in 10V steps up to 1000V, and in 100V steps above 1000V. Keeping the buttons
pressed will speed up the adjustment.

Input voltage
Frequency
Input current
Date 2011.05.24

0.1 V AC

0.2 Hz

11.56 pA

Time 15:31

Megohmmeter Models 6550/6555

29

ADJUSTABLE VOLTAGE

750 V

BURN

Input voltage
Frequency
Input current
Date 2011.05.24

0.1 V AC

0.2 Hz

11.56 pA

Time 15:31

4.4.4 Using a Voltage Ramp

This test is based on the principle that an ideal insulation produces the same resistance whatever the test
voltage applied.

Any negative variation of the insulation resistance therefore means that the insulation is defective: the resistance
of defective insulation decreases as the test voltage increases. This phenomenon is barely observable with low
test voltages. At least 2500V must therefore be applied.

Since the application of the voltage is gradual, it causes no premature ageing or deterioration of the device
tested. Unlike the increase in steps, the gradual increase of the current means that the capacitive current is
constant. A variation of the current therefore directly represents a variation of the insulation resistance.

Evaluating the result:

■ A negative slope of the resistance versus test voltage curve exceeding 500ppm/V generally indicates
the presence of mildew or other deterioration.

■ A larger negative slope, or a sudden drop, indicates the presence of localized physical damage (arcing,
perforation of the insulation, etc).

The test with a voltage ramp is ideally suited for testing semiconductors (diodes, transistors, and thyristors).
Take care in this case to choose a non-destructive type of test: Break at I-limit (see § 2.4.3) and a maximum
output current less than or equal to 1mA.

Set the switch to the V-RAMP position. The following screen appears:

BURN

RAMP FUNCTION 1

30

Min. 50 V

SET-UP

MR

Step

Voltage

V RAMP

V VAR

V FIXED

OFF

Input voltage
Frequency
Input current
Date 2011.05.24

Test Run Time 00:00:30

Max. 100 V

-0.1 V DC

0.2 Hz

55.7 nA

Time 15:31

Megohmmeter Models 6550/6555

Use the ▲▼ buttons to select a preset test voltage ramp:

■ Ramp function 1: 50 to 500V

■ Ramp function 2: 500 to 5000V

■ Ramp function 3: 1000 to 10,000V

The voltages at the beginning and end of the ramp can be programmed with the CONFIG button (see § 2.4.3).
The duration of the test is the sum of the three durations specified: the duration of the initial level, the duration
of the ramp, and the duration of the final level.

4.4.5 Using a Stepped Voltage

The preset stepped voltage tests have ten levels. The duration of each of the voltage levels is identical. At the
end of each level, the capacitive current should be zero and only the measurement current remains.

Unlike the ramp test, the step test stresses the insulation and can cause a breakdown. A sudden increase of
the current (or a sudden decrease of the insulation resistance) means that a breakdown point is near. It is then
possible to discontinue the measurement manually by pressing the START/STOP button or automatically using
E-BRK or Break at I-Limit type of test (see § 2.4.3).

A drop of 25% or more between the insulation resistance of the first level and that of the second level is a sign
of deterioration of the insulation.

Set the rotary switch to the V-STEP position. The following screen appears:

BURN

STEP FUNCTION 1

SET-UP

MR

Step

Voltage

V RAMP

V VAR

V FIXED

OFF

Min. 50 V

Test Run Time 00:01:40

Input voltage
Frequency
Input current
Date 2011.05.24

Max. 500 V

1 V AC

50.0 Hz

24.6 nA

Time 15:31

Use the ▲▼ arrow buttons to choose the preset step type of test:

■ Step function 1: 50 to 500V

■ Step function 2: 500 to 5000V

■ Step function 3: 1000 to 10,000V

The voltage and the duration of each step can be programmed using the CONFIG button (see § 2.4.3).

Megohmmeter Models 6550/6555

31

4.4.6 Connection

Depending on the measurements to be made, there are three ways of connecting the instrument.

In all cases, disconnect the device to be tested from the supply line.

■ Low Insulation

Connect the red high-voltage lead between earth and the + terminal of the instrument. Connect the black high­voltage lead between one phase of the motor and the - terminal of the instrument.

BLACK

RED

+

BLACK

M

RED

■ High Insulation

For very high insulation values, connect the small blue high-voltage lead between the rear pick-up of the black
lead and the G terminal - in this case the shield of black lead will be connected to the ground of the instrument,
which helps to avoid leakage current and capacitive current effects.

This reduces the influence of the operator’s hands on the test leads and gives a more stable measurement.

BLACK

-

RED

BLUE

+

BLACK

M

-

32

RED

Megohmmeter Models 6550/6555

■ Cable

Connect the red high-voltage lead between the braid and the + terminal of the instrument.

Connect the black high-voltage lead between the core and the - terminal of the instrument.

Connect the blue high-voltage lead between the insulation and the G terminal of the instrument.

RED

RED

BLUE

BLACK

BLACK

BLUE

+

G

-

Outer Insulation

Braid

Using the guard eliminates the influence of the surface leakage current.

Insulation

Core

4.4.7 Before the Insulation Measurement

It is possible to configure the measurement using the CONFIG button:

If the V-FIXED or V-VAR test voltages have been selected, it is possible to select a measurement
configuration by pressing the CONFIG button:

■ Manual Stop

■ Manual Stop + DD

■ Timed Run

■ Timed Run + DD

CONFIG

DISPLAY

■ DAR

■ PI

Then set the type of test, the maximum current, the current range, the filtering of the measurement,
and the value of the alarm threshold by pressing the DISPLAY button:

■ Test Type

■ Maximum Output Current

■ I-range

■ Disturbance Level

■ Alarm

To enable the alarm, press the ALARM button. The ALARM symbol will appear in the status line.
The ALARM symbol in the status line will blink and (if the buzzer is switched on) an audible beep will
sound if the result of the measurement is below the programmed threshold.

ALARM

Megohmmeter Models 6550/6555

33

4.4.8 During the Insulation Measurement

START/STOP

START/STOP

Press the START/STOP button to start the measurement.

The instrument generates high voltage. To indicate that the measurement is in progress, the instrument emits
an audible beep every ten seconds (if the buzzer is switched on) and the START/STOP button lights up red.

If the test voltage generated is >5000V, the START/STOP button blinks.

After a few seconds, the measurement is displayed in digital form and in analog form on a bargraph.

E-BRK

995 MΩ

528 V

kΩ

10

100

Set: 500 V

Elapsed Time 00:00:23

MΩ

1

10

100

GΩ

1

10

100

531 nA

TΩ

1

10

If the measurement is unstable, it is possible to apply a digital filter by pressing the FILTER button.

It is possible to view the available result values by pressing the DISPLAY button.

E-BRK

995 MΩ

528 V

DAR (30s/60s)
PI (1.0m/10m)
Capacitance

Set: 500 V

Elapsed Time 00:01:12

531 nA

1.00

---

---

34

DISPLAY

Megohmmeter Models 6550/6555

In the case of a step test voltage (10 steps at most) or ramp test voltage (3 steps), the progress of the steps will
be indicated.

Step 2 of 10

E-BRK

5.03 GΩ

Voltage of the

second step

1030 V

Step 2/10

Remaining Time 00:01:25

209.4 nA

Remaining
measurement time

10

kΩ

100

MΩ

1

10

100

GΩ

1

100

10

TΩ

1

10

You can view the graphical representation of the measurement results by pressing the GRAPH button.

GRAPH

858 GΩ
858 GΩ

00:01:32
00:01:32

V

510

500

490

480

470

GRAPH

500 V
500 V

GΩ

2000

1500

1000

500

0

0 1:00 2:00 3:00 4:00

For V-VAR and V-FIXED it is also possible to change measurement parameters during the measurement, by
pressing the CONFIG button. It is possible to fix the measurement range of the current, to add an analog filter
(disturbance level low/high), or to change the test voltage if in the variable test voltage mode (V-VAR). For more
details, refer to § 2.4.3.

In the case of a ramp measurement, the resistance displayed is always greater than the true resistance because
of the permanent capacitive current due to the permanent variation of the voltage. The value displayed will be
exact only at the end of the test, during the voltage level.

When the instrument is configured for a manual stop, once the measurement is stable, press the START/STOP
button again to stop the measurement. In the other cases (programmed duration: Timed Run, Timed Run + DD,
DAR, PI, V-RAMP, or V-STEP), the measurement stops automatically at the end of the test.

At the end of the measurement, the instrument switches back to voltage measurement, but usually the result of
the insulation resistance measurement remains displayed. To display the voltage, press the DISPLAY button. In
case of an external voltage >25V the instrument automatically switches to the screen with the test description
and small input voltage indication.

Megohmmeter Models 6550/6555

35

The alarm is enabled and the insulation
resistance is below the alarm threshold

Type of test

Current at the end of the measurement

Duration of the measurement

Value of the insulation resistance

Value of the test voltage at the

end of the measurement

Ancillary results

995 MΩ

528 V

Elapsed Time 00:01:12

DAR (30s/60s)
PI (1.0m/10m)
Capacitance

E-BRKALARM

531 nA

1.00

---

2.201 nF

4.4.9 After the Insulation Measurement

Once the measurement has been stopped, the instrument discharges the device being tested in a few seconds.
For your safety, therefore, wait before disconnecting the leads. Normally, this happens rapidly and the user is
unaware of it. But if the load is highly capacitive, the discharging time is longer. In this case, for as long as the
voltage exceeds 25V, the instrument indicates it on the display.

E-BRK

995 MΩ

502 V

Elapsed Time 00:01:20

DAR (30s/60s)
PI (1.0m/10m)
Capacitance

503 nA

1.00

---

<1 nF

The DISPLAY button is used to look up all information available after the measurement. This information
depends on the type of measurement chosen (see § 2.4.4).

In the case of a ramp or step measurement, the measurement result is displayed as follows:

Test with programmed duration

Value of the insulation resistance

E-BRK

5.03 GΩ

Value of the test voltage at the

end of the measurement

∆R: difference of insulation

resistance between the
resistance of the highest test
voltage and the resistance of

the lowest test voltage

516 V

Elapsed Time 00:01:40

∆R
∆V
∆R/(R*∆V) (ppm/V)

Capacitance

98.7 nA

47.9 MΩ

53.3 V

< 1 nF

Current at the end of the measurement

Duration of the measurement

9

Voltage coefficient in ppm/V

Capacitance of the device tested

∆V: difference between the

highest and lowest test voltage

36

Megohmmeter Models 6550/6555

Record the measurement and compare it to earlier measurements in order to assess the evolution of its value.
Also record the temperature and the ambient relative humidity.

If, at equivalent temperature and humidity, the insulation resistance has fallen significantly, the insulation is
deteriorated and maintenance must be carried out on the device tested.

The result remains displayed until another measurement is made, the rotary switch is turned to a different posi­tion, or the measurement configuration is changed.

After a test with programmed duration:

■ Pressing the GRAPH button displays the graphical representation of the results (see § 2.4.5).

■ Only for V-FIXED and V-VAR: Pressing the TEMP button opens the temperature menu (see § 2.4.1).

■ Pressing the MEM button opens the recording menu (see § 5.1).

■ At any time, you can press the HELP button for a reminder of the functions of the buttons.

4.5 Error Indications

The most common error in the case of an insulation measurement is the presence of a voltage on the terminals.

The instrument can make the measurement if the peak value of this voltage is less than 0.4VN or 1000VAC max.

Above this value, it is necessary to eliminate the voltage and repeat the measurement.

If an external voltage appears on the terminals during the measurement, and its peak value is greater than

1.1VN, the measurement is stopped and the error is indicated.

4.6 DAR (dielectric absorption ratio) and PI (polarization index)

For V-FIXED and V-VAR: In addition to the quantitative value of the insulation resistance, it is very useful to cal­culate the quality ratios of the insulation (the DAR and the PI) because they can eliminate the influence of certain
parameters likely to invalidate the “absolute” insulation measurement. They also serve to predict the evolution
of insulation quality over time.

The most important of the parameters influencing the measurement results are:

■ temperature and relative humidity, with which insulation resistance varies according to a quasi-
exponential law.

■ the disturbance currents (capacitive charging current, dielectric absorption current) created by the
application of the test voltage. Even if they gradually fade, they interfere with the measurement at the
start, for a more or less long time depending on whether the insulation is sound or degraded.

These ratios therefore complete the “absolute” insulation value and reliably reflect the condition, good or bad,
of the insulation.

In addition, long-term observation of the evolution of these ratios is a way to monitor the aging of the insulation.
For example, that of a revolving machine or of a long cable.

The values of DAR and PI are calculated as follows:

■ DAR = R 1 min/R 30s (2 values to be taken during a 1-min measurement)

■ PI = R 10 min/R 1 min (2 values to be taken during a 10-min measurement)

The times of 1 and 10 minutes for the calculation of the PI and the times of 30 seconds and 1 minute for the
calculation of the DAR can be modified in the CONFIG menu or the SET-UP function (see § 3.4), to adapt to
particular applications.

Megohmmeter Models 6550/6555

37

4.6.1 DAR/PI Measurement

There are several ways of measuring the DAR and the PI:

■ Manual Configuration:

Press the START/STOP button. Wait one minute for the DAR or ten minutes for the PI (if the default values are
used).

BURN

499 MΩ

502 V

Elapsed Time 00:10:08

kΩ

1

10

100

START/STOP

Press the START/STOP button again to stop the measurement.

10

502 MΩ

502 V

Elapsed Time 00:10:10

DAR (30s/60s)
PI (1.0m/10m)
Capacitance

START/STOP

Set: 500 V

MΩ

100

1

10

GΩ

978 nA

100

978 nA

320 nF

1

BURN

2.64

1.05

TΩ

10

■ Automatic Configuration (preferred)

Press the CONFIG button.

38

CONFIG

CONFIG

Total Run Time ---

Manual Stop

Manual Stop + DD
Timed Run (m:s) 2:00
Timed Run + DD
DAR (s/s) 30/60
PI (m/m) 1.0/10

Megohmmeter Models 6550/6555

Use the ▲▼ arrow buttons to select DAR or PI.

CONFIG

Total Run Time 00:01:00

Manual Stop
Manual Stop + DD
Timed Run (m:s) 2:00
Timed Run + DD

DAR (s/s) 30/60

PI (m/m) 1.0/10

Total Run Time 00:10:00

Manual Stop
Manual Stop + DD
Timed Run (m:s) 2:00
Timed Run + DD
DAR (s/s) 30/60

PI (m/m) 1.0/10

CONFIG

Press the CONFIG button to exit the configuration menu.

DAR or PI is displayed in the top left corner of the display unit to indicate the configuration chosen.

Press the START/STOP button to start the measurement. It stops automatically and the values of DAR and PI
are displayed.

4.6.2 Interpretation of the Results

DAR PI Condition of insulation

DAR < 1.25

1.25 ≤ DAR < 1.6 2 ≤ PI < 4 Good

1.6 ≤ DAR 4 ≤ PI Excellent

PI < 1

1 ≤ PI < 2

Poor or even dangerous

A capacitance in parallel to the insulation resistance extends the settling times of the measurements. This can
affect or even inhibit the measurement of DAR or PI (depending on the time set for recording the first resistance
value). The table below indicates the typical values of the capacitances in parallel with the insulation resistance,
making it possible to measure the DAR and the PI without changing their preset durations.

100kW 1MW 10MW 100MW 1GW 10GW 100GW

500V 10µF 10µF 10µF 6µF 4µF 2µF 1µF

1000V 5µF 5µF 5µF 3µF 2µF 1µF 0.5µF

2500V 2µF 2µF 2µF 1.2µF 1µF 0.5µF 0.2µF

5000V 1µF 1µF 1µF 0.6µF 0.4µF 0.3µF 0.1µF

10,000V 0.5µF 0.5µF 0.5µF 0.3µF 0.2µF 0.1µF 0µF

15,000V 0.3µF 0.3µF 0.3µF 0.2µF 0.1µF 0.1µF 0µF

Megohmmeter Models 6550/6555

39

4.7 DD (dielectric discharge index)

In the case of multilayer insulation, if one of the layers is defective but the resistance of all the others is high,
neither the quantitative insulation measurement nor the calculation of the PI and DAR quality ratios will reveal
the problem.

This makes it judicious to perform a dielectric discharge test, from which the DD term can be calculated. This
test measures the dielectric absorption of heterogeneous or multilayer insulation and disregards parallel-sur­face leakage currents.

The dielectric discharge test is especially well suited for measuring the insulation of revolving machines and
more generally for measuring the insulation on heterogeneous or multi-layer insulating materials containing
organic substances.

It involves applying a test voltage for long enough to electrically “charge” the insulation to be measured. At
the end of the measurement, the instrument induces rapid discharging, during which the capacitance of the
insulation is measured, then, one minute later, it measures the residual current flowing in the insulation.

The DD term is then calculated as follows:

DD = current measured after 1 minute (mA)/[test voltage (V) x measured capacitance (F)]

4.7.1 DD Measurement

Press the CONFIG button.

CONFIG

Total Run Time ---

Manual Stop

Manual Stop + DD
Timed Run (m:s) 2:00
Timed Run + DD
DAR (s/s) 30/60
PI (m/m) 1.0/10

CONFIG

Use the▲▼ arrow buttons to select Manual Stop + DD or Timed Run + DD (manual or automatic measurement).

CONFIG

Total Run Time ---

Manual Stop

Manual Stop + DD

Timed Run (m:s) 2:00
Timed Run + DD
DAR (s/s) 30/60
PI (m/m) 1.0/10

CONFIG

Total Run Time 00:03:00

Manual Stop
Manual Stop + DD
Timed Run (m:s) 2:00

Timed Run + DD

DAR (s/s) 30/60
PI (m/m) 1.0/10

To set the duration of the measurement, place the cursor on Timed Run (m:s). Then use the ◄ ► and▲▼ arrow
buttons to set the minutes and seconds. The minimum setting is 0:01 but a duration below 30 seconds is hardly
useful because acquiring a stable resistance result requires some time.

40

Megohmmeter Models 6550/6555

CONFIG

Total Run Time 00:02:00

Manual Stop
Manual Stop + DD

Timed Run (m:s) 2:00

Timed Run + DD
DAR (s/s) 30/60
PI (m/m) 1.0/10

Once the duration has been set, move the cursor back to Timed Run + DD.

■ Press the CONFIG button to confirm and exit the configuration menu. DD or DD is displayed in the
top left corner of the display unit to indicate the configuration chosen.

■ Press the START/STOP button to start the measurement.

In the Manual Stop + DD configuration, wait until the elapsed time is greater than one minute, then press the
START/STOP button to stop the measurement.

In the Timed Run + DD configuration (indicated by the symbol), the measurement stops automatically.

In both cases, it is necessary to wait one minute after the measurement is stopped (countdown on the display
unit) for the instrument to display the result. During this time, the START/STOP button is lit but the instrument
does not emit an audible signal.

The result is then displayed.

BURNDD

234.5 MΩ

START/STOP

4.7.2 Interpretation of Results

Value of DD Quality insulation

507 V

Elapsed Time 00:02:00
DAR (30s/60s)
PI (1.0m/10m)
Capacitance
DD current
DD

224.6 pA

1.42

- - -

2.201 nF

11.55 pA

2.55

7 < DD Very poor

4 < DD < 7 poor

2 < DD < 4 Borderline

DD < 2 Good

Megohmmeter Models 6550/6555

41

4.8 Capacitance Measurement

The capacitance measurement is made automatically during the insulation measurement, and is displayed after
the measurement has been stopped and the device tested has been discharged.

4.9 Measurement of the Residual Current

The measurement of the residual current flowing in the device tested is made automatically as soon as the con­nection to the device tested is made, then during and after the insulation measurement.

42

Megohmmeter Models 6550/6555

5. MEMORY FUNCTION

5.1 Recording a Measurement

Each insulation measurement can be recorded once the measurement process is completed. It is not possible
to record input voltage measurements prior to starting a test.

The results are recorded at addresses identified by an object number (OBJ) and a test number (TEST).

An object can contain 99 tests. An object can represent a machine or an installation on which a certain number
of measurements will be performed.

■ At the end of the measurement, press the MEM button.

■ The instrument proposes recording the result at the first available location in memory. It is possible to
modify the proposed location using the ◄ ► and▲▼ arrow buttons.

Store

Obj. Test

01 01

MEM

■ Press the MEM button again to confirm the storage location.

■ The instrument then asks you if you want to Store Samples with the measurement.

Store

Obj. Test

01 01

Store Samples
Sample Time (m:s)

MEMORY

Date Time Fct.

2011-05-26 09:04 500V

MEMORY

Date Time Fct.

2011-05-26 09:04 500V

Yes

Min.

MEM

The graph of the measurement can then be displayed by a single press on the GRAPH button (see § 2.4.5).

If this is not required, set Store Samples to OFF.

If Store Samples are set to Yes, the Sample Time can be set using the ◄ ► and▲▼ arrow buttons.

■ The default sampling time (the time difference between two stored samples) is the minimum, meaning that
all samples acquired during the measurement are recorded.

■ The sampling time can be set to Auto (automatic), in which case the instrument itself determines the
samples necessary for the plotting of the measurements while using the least possible memory. If the

Megohmmeter Models 6550/6555

43

measurement does not vary, it will take only one value, giving a perfectly flat curve.

This value is recommended to optimize memory use.

The sampling time can also be programmed, between 1 and 25 seconds.

■ The longer the measurement, the longer the sampling time can be. For example, on a measurement
lasting 10 minutes, the sampling time can be 10 seconds, giving 60 points for the graph, which is
sufficient.

■ Again, the more stable the measurement, the longer the sampling time can be. The more unstable
the measurement, the shorter the sampling time must be in order to correctly display variations of the
insulation resistance.

Press the MEM button one last time to record the measurement. The instrument confirms the storage.

OK

MEM

The measurement is recorded with all its supporting information.

To exit without recording and return to the last measurement, press the ◄ button.

For each new record, the instrument proposes the first free memory location following the last stored measure­ment. It is also possible to record a measurement at a memory location that has already been used.

Store

The bargraph indicates the

quantity of memory used (in

black), the quantity of memory

available (in white).

Obj. Test Date Time Fct.

03 01

02 02
02 01
01 02
01 01

The number of measurements that can be recorded depends on the number of samples stored for each mea­surement.

MEMORY

2011-05-28
2011-05-27
2011-05-27
2011-05-26
2011-05-26

09:04
10:43
10:38
15:04
14:56

2550V

1000V

500V

Measurement function and
availabity of samples are
indicated.

The instrument store 256 measurements and 80,000 samples associated with these measurements.

44

Megohmmeter Models 6550/6555

5.2 Reading Recorded Values

Turn the rotary switch to the MR position.

The instrument indicates the memory used and the object number of the last stored record, along with the
lowest and highest test numbers it contains.

67 01 08

SET-UP

MR

Step

Voltage

V RAMP

V VAR

V FIXED

OFF

Choose the object number using the ▲▼ arrow buttons, then press the ► button.

The instrument then displays the list of records around the object chosen.

To see details of a measurement, place the cursor on the object and the test chosen using the▲▼ arrow but­tons, then press the ► button.

Obj. Test Date Time Fct.

03 01
02 02
02 01
01 02
01 01

2011-05-28
2011-05-27
2011-05-27
2011-05-26
2011-05-26

09:04
10:43
10:38
15:04
14:56

2550V

1000V

500V

Obj. Test Date Time Fct.

02 02

2011-05-27

Resistance
Voltage
Current
Elapsed time
Sample time (m:s)

10:43

5.05 GΩ

965 V

190.6 nA
00:01:40

0:02

Press the DISPLAY button to see the rest of the recorded information (depending on the currently used func-
tion).

When the symbol indicates that the samples have been recorded, you can press the GRAPH button to view
the graph.

Megohmmeter Models 6550/6555

45

DISPLAY

Obj. Test Date Time Fct.

02 02

2011-05-27

10:43

Step Function

Step Voltage Duration (m:s)

6
7
8
9

10

600 V
700 V
800 V
900 V

1000 V

0:10
0:10
0:10
0:10
0:10

GRAPH

102 V
102 V

GΩ

10.0

7.5

5.0

2.5

0

0 1:00 2:00 3:00 4:00

MEMORYRecall

--- TΩ

--- TΩ

00:00:02
00:00:02

V

1000

750

500

250

0

Press the GRAPH button to exit from the graph.

In the case of a V-FIXED or V-VAR measurement, you can press the TEMP button to view the temperature infor­mation. The instrument can display only the information recorded with the measurement.

Press the TEMP button, then the ◄ arrow button, to exit and return to the list of recorded measurements.

Obj. Test Date Time Fct.

2011-05-27 10:43 2500V

23 °C

40%
23 °C
40 °C
10 °C

5.00 GΩ

1.529 GΩ

TEMP

TEMP

05 02

Air Temperature
Humidity
Probe Temperature
Rc Reference Temperature
∆T for R/2

R measured
Rc at 40 °C

46

Megohmmeter Models 6550/6555

5.3 Erasing the Memory

Turn the rotary switch to the MR position.

SET-UP

MR

Step

Voltage

V RAMP

V VAR

V FIXED

OFF

5.3.1 Erasing One Record

With an object selected, use the ▲▼ arrow buttons to select the record to be erased in the list of records in
memory.

Press the CONFIG button. The instrument requests confirmation of the deletion.

Store

Obj. Test Date Time Fct.

03 01

02 02
02 01
01 02
01 01

Select OK to confirm or CANCEL to cancel. The instrument then returns to the top level memory screen.

MEMORY

2011-05-28
2011-05-27
2011-05-27
2011-05-26
2011-05-26

09:04
10:43
10:38
15:04
14:56

2550V

1000V

500V

CONFIG

! WARNING !

MEMORY

Selected data set

will be cleared !

O.K.
CANCEL

67 01 08

NOTE: Deleting a single record doesn’t delete it physically - only the link to it is deleted. The record number can

be used again for storing another measurement. Physical clearing of data is only accomplished when
clearing the whole memory.

Megohmmeter Models 6550/6555

47

5.3.2 Erasing All Records

Press the CONFIG button. The instrument requests confirmation of the deletion.

Select OK to confirm or CANCEL to cancel.

MEMORY

67 01 08

! WARNING !

All data sets

will be cleared !

O.K.

The instrument in this case completely reformats the memory, which takes a few minutes. During this time, it
displays “WAIT”.

The instrument then returns to the top level memory screen. Since there is no longer any record, it displays:

CONFIG

CANCEL

ERROR

No data records!

5.4 Error Codes

If an anomaly is detected when the instrument is turned on or in operation, the display indicates a one- or two­digit number error code. This number identifies the anomaly and states what to do to put the instrument back
into service.

■ Errors 1 to 9 concern internal circuit board problems and require a repair by a qualified individual.

■ Error codes 20 to 25 help the repair personnel locate a malfunction

■ If the recorded data is corrupted, the only way possible to reuse the memory is to erase it completely
(see § 5.3.2). The instrument reports this problem by displaying “CLEAR MEMORY”.

■ All other errors require returning the instrument for repair (see § 8.5).

48

Megohmmeter Models 6550/6555

6. DATAVIEW® SOFTWARE

For complete information on using the Megohmmeter with DataView, refer to the Help Menu within the

Megohmmeter Control Panel in DataView.

6.1 Installing DataView

DataView® is a registered trademark of Chauvin Arnoux® d.b.a. AEMC® Instruments.

DO NOT CONNECT THE INSTRUMENT TO THE PC BEFORE INSTALLING THE SOFTWARE AND
DRIVERS.

USB Flash Drive Install

1. Insert the USB drive into an available USB port (wait for driver to be installed).

2. If Autorun is enabled then an AutoPlay window should appear as shown.

NOTE: If Autorun is disabled, it will be necessary to open Windows Explorer, then locate and open the

USB removable disk drive labeled “DataView” to view the files on the drive.

3. In the AutoPlay window, select “Open folder to view files”.

4. Double-click on Setup.exe from the opened folder view to launch the DataView setup program.

If installing onto a Vista based computer the User Account Control dialog box will be displayed. Select
the Allow option to proceed.

2. A Set-up window, similar to the following, will appear.

Megohmmeter Models 6550/6555

49

There are several different options to choose from. Some options(*) require an internet connection.

■ DataView, Version x.xx.xxxx - Installs DataView onto the PC.

■ *Adobe Reader - Links to the Adobe® website to download the most recent version of Adobe® Reader

to the computer. Adobe® Reader is required for viewing PDF documents supplied with DataView.

■ *DataView Updates - Links to the online DataView software updates to check for new software
version releases.

■ *Firmware Upgrades - Links to the online firmware updates to check for new firmware version
releases.

■ Documents - Shows a list of instrument related documents that you can view. Adobe® Reader is
required for viewing PDF documents supplied with DataView.

3. DataView, Version x.xx.xxxx option should be selected by default. Select the desired language and then

click on Install.

4. The Installation Wizard window will appear. Click Next.

5. To proceed, accept the terms of the license agreement and click Next.

6. In the Customer Information window, enter a Name and Company, then click Next.

7. In the Setup Type window that appears, select the “Complete” radio button option, then click Next.

8. In the Select Features window that appears, select only the instrument’s control panel that you want to

install, then click Next.

The PDF-XChange option must be selected to be able to generate PDF reports from within DataView.

50

Megohmmeter Models 6550/6555

9. In the Ready to Install the Program window, click on Install.

10. If the instrument selected for installation requires the use of a USB port, a warning box will appear, similar

to below. Click OK.

The installation of the drivers may take a few moments. Windows may even indicate that it is not respond­ing, however it is running. Please wait for it to finish.

11. When the drivers are finished installing, the Installation Successful dialog box will appear. Click on OK.

12. Next, the Installation Wizard Complete window will appear. Click on Finish.

13. A Question dialog box appears next. Click Yes to read the procedure for connecting the instrument to the

USB port on the computer.

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51

The Set-up window remains open. You may now select another option to download (e.g. Adobe® Reader),
or close the window.

14. Restart your computer.

Shortcuts for DataView and each instrument control panel selected during the installation process have been
added to your desktop.

You can now open the Megohmmeter Control Panel and connect your instrument to the computer.

6.2 Connecting the Instrument to the PC

INSTALL THE SOFTWARE AND DRIVERS BEFORE CONNECTING THE INSTRUMENT TO A PC.

■ Set the switch to any position other than OFF.

■ The data rate must be 38,400 bauds for the instrument (see §5.2) and for the PC.

■ Connect the instrument to the PC using the optical USB cable supplied with the instrument, after
removing the cover that protects the port in the instrument.

When in communication with a PC, the instrument displays “REMOTE” and no longer reacts to the user’s com­mands. The buttons and the rotary switch are inactive, except for stopping the instrument (OFF setting).

REMOTE

ADJUSTABLE VOLTAGE 1

50 V

Input voltage
Frequency
Input current
Date 2011.05.24

6.3 Megohmmeter Control Panel

6.3.1 Opening the Control Panel

To open the Megohmmeter Control Panel:

■ Double-click the Megohmmeter icon that was created during installation, located on the desktop.

■ The Megohmmeter Control Panel window will appear.

0.1 V AC

0.2 Hz

11.56 pA

Time 15:31

For complete information on using the Megohmmeter with DataView, refer to the Help Menu within the

Megohmmeter Control Panel in DataView.

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Megohmmeter Models 6550/6555

7. SPECIFICATIONS

7.1 Reference Conditions

Influence Quantities Reference values

Temperature

Relative Humidity

Supply Voltage

Frequency Range

Capacitance in Parallel on Resistance

Electric Field

Magnetic Field

23 ± 3°C

45 to 55% RH

9 to 12V

DC and 15.3 to 65Hz

0µF

null

<40A/m

The inherent accuracy is the error specified for the reference conditions.

The operating accuracy includes the inherent uncertainty plus variations of the quantities of influence (supply
voltage, temperature, interference, etc.) as defined in standard IEC-61557.

7.2 Electrical Specifications

7.2.1 Voltage

Measurement Range 1.0 to 99.9V 100 to 999V 1000 to 2500V 2501 to 4000V

Resolution

Accuracy

Frequency range

0.1V 1V 2V 2V

±(1% +5cts) ±(1% +1ct)

DC or 15 to 500Hz DC

■ Input impedance: 3MW

7.2.2 Current

Measurement Range
(DC)

Resolution

Accuracy

Measurement Range
(DC)

Resolution

Accuracy

0.000 to 0.399nA 0.400 to 3.999nA 4.00 to 39.99nA 40.0 to 399.9nA 400 nA to 3.999µA

1pA 1pA 10pA 100pA 1nA

±(15% + 10cts) ±10% ±5%

4.00 to 39.99µA 40.0 to 399.9µA 400 µA to 3.999mA 4.00 to 9.999mA

10nA 100nA 1µA 10µA

±5%

7.2.3 Insulation Resistance

■ Method: Voltage-current measurement per IEC-61557-2 from 300 to 10,000V and
per DIN VDE 0413 Part 1/09.80)

■ Nominal output voltage: 500V, 1000V, 2500V, 5000V, 10,000V, and 15,000VDC for the Model 6555

or adjustable from 40 to 10,000VDC and 15,000VDC for the Model 6555

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53

Inherent accuracy ±1%
adjustable from 40 to 10,000VDC in 10-V steps
adjustable from 1000 to 15,000VDC in 100-V steps

■ Maximum current: ≤1mADC from 40 to 999V

5 to 0.2mADC from 1000 to 15,000V. The user can adjust this current.

■ Maximum acceptable peak AC voltage at terminals during measurement:

0.4VN or 1000VAC maximum

■ Short-circuit current: ≤5mADC ±5%. This current can be limited in SET-UP (setting “maximum output

current”), to between 0.2 and 5mA. It can also be limited by the maximum output
power, which is 10W.

■ Maximum output current as a function of the test voltage

UN (V) 50 100 200 300 1100 1200 1300 5000 10,000 15,000

I (mA)

P (W)

0.22 0.46 0.93 1.07 1.07 5 5 2 1 0.5

≤ 1 10

If the current is limited in SET-UP, the values mentioned above that exceed the limit will be lowered.

■ Fixed Test Voltage

Test Voltage (V) 500 - 1000 - 2500 - 5000 - 10,000 - 15,000

Specified
measurement range

Resolution

Accuracy

Operating error

Test Voltage (V)

Specified
measurement range

Resolution

Accuracy

Operating error

10 to 999kW

1.000 to 3.999MW
1kW 10kW 100kW 1MW 10MW

500 - 1000 - 2500 - 5000

10,000 - 15,000

40.0 to 399.9GW

100MW 1GW 1GW 10GW 10GW

±(20% + 15cts) ±(30% + 15cts)

4.00 to 39.99MW 40.0 to 399.9MW 400 to 3.999GW 4.00 to 39.99GW

±(5% + 3cts)

±(10% + 6cts)

≥1000 ≥2500 ≥5000

400 to 999GW

1.000 to 1.999TW

±(15% + 10cts) ±(20% + 10cts)

2.000 to 3.999TW 4.00 to 10.00TW 4.00 to 15.00TW

Test Voltage (V) ≥10,000 15,000 (6555 only)

Specified measurement range

Resolution

Inherent accuracy

Operating error

54

4.00 to 25.00TW 4.00 to 29.00TW
10GW 10GW

±(20% + 10cts) ±(20% + 10cts)

±(30% + 15cts)

Megohmmeter Models 6550/6555

■ Variable test voltage

T

Minimum resistance measured = 10kW
Maximum resistance measured = to be interpolated from the values in the tables of fixed test voltages above.
The inherent uncertainty depends on the test voltage and on the resistance measured. It can be interpolated

from the tables of fixed test voltages.

■ Typical discharge time of a capacitive element to reach 25 VDC

Test Voltage 50V 100V 250V 500V 1000V 2500V

Discharge Time (C at µF)

Test Voltage 5000V 10,000V 15,000V

Discharge Time (C at µF)

0.25 s x C 0.5 s x C 1 s x C 2 s x C 4 s x C 7 s x C

14 s x C 27 s x C 57 s x C

■ Typical curves of the test voltages at the instrument terminals as a function of the load resistance

500V Range

V

600

500

400

300

200

100

0

10 k 100 k 1 M 10 M 100 M 1 G 10 G 100 G 1

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55

1000V Range

T

T

V

1200

1000

800

600

400

200

0

10 k 100 k 1 M 10 M 100 M 1 G 10 G 100 G 1 T 10

2500V Range

V

3000

2500

2000

1500

1000

500

0

10 k 100 k 1 M 10 M 100 M 1 G 10 G 100 G 1 T 10

56

Megohmmeter Models 6550/6555

5000V Range

T

T

V

6000

5000

4000

3000

2000

1000

0

10 k 100 k 1 M 10 M 100 M 1 G 10 G 100 G 1 T 10

10,000V Range

V

12000

10000

8000

6000

4000

2000

0

10 k 100 k 1 M 10 M 100 M 1 G 10 G 100 G 1 T 10

Megohmmeter Models 6550/6555

57

16000

T

14000

12000

10000

8000

6000

4000

2000

15,000V Range

V

0

10 k 100 k 1 M 10 M 100 M 1 G 10 G 100 G 1 T

7.2.4 DAR, PI, and DD

■ Calculation of the DAR and PI terms

Measurement Range 0.02 to 50.00

Resolution

Accuracy

0.01

± (5% + 1ct)

■ Calculation of the DD term

Measurement Range 0.02 to 50.00

Resolution

Accuracy

0.01

±( 10% + 1ct)

7.2.5 Capacitance

10 T 100

Capacitance measurement

This measurement is made following the discharging of the element tested, after each measurement

Measurement Range 0.005 to 9.999µF 10.00 to 49.99µF

Resolution

Accuracy*

*specified only for a test voltage ≥500V

58

1nF 10nF

± (10% + 1 ct) ± 10%

Megohmmeter Models 6550/6555

7.3 Power Supply

The instrument is powered by two rechargeable 9.6V, 4Ah NiMH battery packs.

Charging is carried out by connecting the instrument to line voltage of 90 to 260V and a frequency of 50/60 Hz,
with an ambient temperature of 32° to 86°F (0° to 30°C).

7.3.1 NiMH Technology

The NiMH technology has many advantages, such as:

■ long life between charges with limited bulk and weight

■ recharging capability

■ a very small memory effect: you can recharge your battery even if it is not fully discharged, without
reducing its capacity

■ environmental protection through the elimination of polluting materials such as lead and cadmium

The NiMH technology allows a limited number of charging/discharging cycles that depends on the conditions
of use and the charging conditions. Under optimum conditions, this number of cycles is 200.

7.3.2 Battery Charger

The built-in charger manages the charging current, the battery voltage, and the internal temperature of the bat­tery simultaneously. This optimizes the charging, while ensuring a long battery life.

The day before you use your device, check its charge condition. If the battery level indicator shows less than
three bars, charge the device overnight (see §4.1).

The charging time varies between 6h and 10h.

A half-hour charge restores 10% of the capacity of the battery, enough to make a few measurements.

It is possible to recharge the batteries while making insulation measurements, provided that the voltages used
are not too high and the measured values are high enough. In this case, the recharging time will exceed 6 hours;
it will depend on the frequency of the measurements made. Otherwise, the battery will be discharged faster
than it is charged.

In order to extend the life of your battery:

■ charge your device only between 10° and 30°C

■ observe the conditions of use and storage stated in this manual

A new battery becomes fully effective only after several complete charging/discharging cycles. This will not
however prevent you from using your device when it has been charged for the first time. However, we recom­mend making the first charge a full charge (at least 10 hours).

If the instrument indicates that charging is over, do not hesitate to disconnect the charger for a few seconds,
then reconnect it to top up the charge.

The battery in your instrument, like any rechargeable battery, is subject to significant residual discharging, even
when the instrument is off. If your device has not been used for several weeks, it is probable that the battery will
be partially discharged, even if it had been fully recharged just before going into storage.

In this case, before using it again, you should fully recharge the battery (at least 10 hours).

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59

The longer your battery is stored, the more it is discharged. After three months’ storage of the battery without
periodic recharging, the battery is probably fully discharged.

Possible consequences are:

■ Failure of the instrument to switch on, as long as the power cord is not connected.

■ A loss of the instrument’s date and time.

7.3.3 Optimize Battery Charging

During charging, the temperature of the battery rises substantially, especially towards the end. A safety device,
built into the battery, checks constantly that the battery temperature does not exceed an acceptable maximum.
If this maximum is exceeded, the charger switches off automatically, even if charging is not complete.

Above 86°F (30°C), it is not possible to charge the battery fully because the charging will cause overheating.

7.3.4 Battery Life

The mean battery life depends on the measurement and on how the device is used.

Test Voltage (V) 500 1000 2500 5000 10,000 15,000 Voltmeter

Battery Life (h)

15 12 2 2 2 2 25

How long your device can operate when the battery is fully charged depends on several factors:

■ The consumption of the device, which depends on the measurements you make.

■ The capacity of the battery is greatest when the battery is new, and declines as the battery ages.

Here are a few ways to extend battery life between charges:

■ Use the back-lighting only when it is strictly necessary.

■ Set the brightness of the back-lighting to the lowest level at which you can still read the display unit.

■ Enable the Auto Power OFF function (see SET-UP § 3.4).

■ During insulation measurements conducted in MANUAL mode, with high test voltages, stop the
measurement by pressing the START/STOP button when the measurement is complete.

7.3.5 “Defect” message

When a battery is deeply discharged or its storage temperature is low, the charger may execute a reactivation
stage prior to fast charge. That means that the charger applies a slow charge until the battery reaches either a
minimum temperature threshold or a minimum charge voltage threshold.

If the battery is in good condition, this reactivation stage ends after about 45 minutes then charger switches
over to fast charging.

However, if the maximum time allowed for the reactivation stage is exceeded or the internal resistance of a bat­tery at the end of its life is high, the instrument declares the battery defective in the form of a “Defect” message
on the instrument screen.

The instrument must then be sent in for repair (see § 8.5).

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Megohmmeter Models 6550/6555

7.4 Environmental Specifications

■ Range of use

The relative humidity can significantly affect insulation. Take care not to make an insulation resistance measure­ment if the temperature is below the dew point.

32° to 113°F (0° to 45°C); 0 to 90% RH

■ Specified domain of use
32° to 95°F (0° to 35°C); 0 to 75% RH

■ Storage (without the batteries)

-40° to 158°F (-40° to 70°C); 10 to 90% RH

■ Altitude: <2000m

■ Degree of pollution: 2

7.5 Mechanical Specifications

■ Dimensions: (LxWxH): 13.4 x 11.8 x 7.9" (340 x 300 x 200mm)

■ Weight: approximately 13.7 lb (6.2kg)

7.6 Safety Specifications

■ Electrical safety per: IEC-61010-1, IEC-61557 parts 1 and 2 (up to 10kV) or VDE 0413

■ Double insulation

■ Degree of pollution: 2

■ Voltage measurement category: 1000V CAT IV

■ Maximum voltage with respect to earth: 1000Vrms CAT IV

■ Maximum voltage between guard terminal G and the - terminal: 30Vrms

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61

7.6.1 Electromagnetic Compatibility

Emissions and immunity in an industrial environment per IEC-61326-1.

7.6.2 Mechanical Protections

IP 65 according to IEC-60529 with the housing closed and IP 54 with the housing open.

IK 04 according to IEC-50102.

7.7 Variations in the Domain of Use

Influence quantity Range of influence Quantity influenced

Battery voltage

Temperature -10 to +55°C

Humidity

Frequency 15 to 500Hz V ±3% ±(0.5% + 1ct)

AC voltage superimposed
on test voltage

9 to 12V

U >7.5kV and R < 10TW

10 to 75% RH

with t ≤ 35°C

0 to 20%Vn MW ±0.1%/%Vn ±(0.5%/%Vn + 5cts)

MW (10kW to 40GW)

MW (40GW to 10TW)

U > 7.5 kV and 3TW < R < 10TW

V

MW

V

MW - GW

V

(1)

Typical Maximum

< 1ct
< 1ct

±0.15%/10°C

±0.2%/10°C
±1.5%/10°C

±0.2%
±0.2%
±0.3%

±(15% + 5cts)

Influence

2cts
3cts

±(0,3%/10°C + 1ct)

±(1%/10°C + 2cts)
±(3%/10°C + 2cts)

±(1% + 2cts)

±(1% + 5cts)
±(15% + 5cts)
±(30% + 5cts)

(1): The DAR, PI and DD terms and the capacitance and leakage current measurements are included in the quantity “MW”.

7.8 Inherent and Operating Accuracy

The Megohmmeter Models 6550 and 6555 comply with standard IEC-61557, which requires that the operating
accuracy, called B, be less than 30%.

In insulation measurements, B = ± ( |A| + 1,15 √ E1² + E2² + E3² )

with A = inherent accuracy

E1 = influence of the reference position ±90°

E2 = influence of the supply voltage within the limits indicated by the manufacturer

E3 = influence of the temperature between 0° and 35°C

Specifications are subject to change without notice.

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Megohmmeter Models 6550/6555

8. MAINTENANCE

8.1 Recharging the Battery

Refer § 4.1 for full details on recharging the battery.

The Megohmmeter Model 6550/6555 is equipped with a rechargeable NiMH battery. This technology offers
several advantages:

■ Long battery charge life for a limited volume and weight

■ Possibility of quickly recharging your battery

■ Significantly reduced memory effect: you can recharge your battery even if it is not fully discharged

■ Environmental protection through the elimination of polluting materials such as lead and cadmium

After prolonged storage, the battery may be completely discharged. If so, it must be completely recharged.

Your instrument may not function during part of this recharging operation.

Full recharging of a completely discharged battery may take several hours.

In this case, at least 5 charge/discharge cycles will be necessary for your battery to recover 95% of its
capacity.

To make the best possible use of your battery and extend its effective service life:

■ Only charge your instrument at temperatures between 32° and 86°F (0° and 30°C)

■ Comply with the conditions of use defined in the operating manual

■ Comply with the storage conditions specified in the operating manual

Before first use, charge and discharge the instrument one or two cycles to ensure the proper level display
of the battery indicator.

8.2 Replacing the Battery

The batteries can be replaced only by the manufacturer’s service center or by an approved repair center.

WARNING: Replacing the battery may result in the loss of the stored data. Back up all stored data before

sending the instrument in for repair.

To return the instrument for battery replacement see § 8.5.

When the repaired instrument is returned:

■ Erase the memory completely (see § 5.3.2) to be able to use the MEM/MR functions again

■ If necessary, reset the date and time of the instrument (see § 3.4)

■ Fully recharge the battery

AEMC® will not be held responsible for any accident, incident, or malfunction following a repair done other than
by its service center or by an approved repair center.

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63

8.3 Replacing the Fuse

If the GUARD FUSE message appears on the display unit, the guard terminal fuse must be replaced.

The fuse can be replaced only by competent, accredited personnel.

8.4 Cleaning

Disconnect the instrument from any source of electricity.

■ Use a soft cloth, lightly dampened with soapy water

■ Wipe with a damp cloth and then dry with a dry cloth

■ Do not splash water directly on the clamp

■ Do not use alcohol, solvents or hydrocarbons

8.5 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: [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.

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

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Megohmmeter Models 6550/6555

8.7 Limited Warranty

The Models 6550/6555 are warranted to the owner for a period of one year 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, 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 one-year 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.

REGISTER YOUR PRODUCT ONLINE AT: www.aemc.com

8.8 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 Depart-

ment (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)
Fax: [phone] or [phone]
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.

Megohmmeter Models 6550/6555

65

10/15

99-MAN 100374 v9

15FaradayDrive•Dover,NH03820USA•Phone:(603)749-6434•Fax:(603)742-2346

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

www.aemc.com