10kV and 15kV MEGOHMMETERS
6550
6555
ENGLISH
User Manual
Statement of Compliance
Chauvin Arnoux®, Inc. d.b.a. AEMC® Instruments certies
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 specications.
An NIST traceable certicate 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
www.aemc.com
®
Instruments
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 qualied and trained users.
Signies 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 signies 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, re, 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 specied, 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 ngers 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 xed 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 ..................................................................... 21
3.4 Conguring the Instrument (SET-UP) .................................................................................................. 21
3.4.1 Conguring the Instrument using the SET-UP Function ........................................................... 21
3.4.2 Congurable Parameters .......................................................................................................... 22
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 ............................................................................................................ 43
4.8 Capacitance Measurement .................................................................................................................. 43
4.9 Measurement of the Residual Current ................................................................................................. 43
5. MEMORY FUNCTION .......................................................................................... 43
5.1 Recording a Measurement ...................................................................................................................43
5.2 Reading Recorded Values .................................................................................................................... 45
5.3 Erasing the Memory ............................................................................................................................. 46
5.3.1 Erasing One Record .................................................................................................................. 47
5.3.2 Erasing All Records ................................................................................................................... 47
5.4 Error Codes .......................................................................................................................................... 48
6. DATAVIEW® SOFTWARE .....................................................................................49
6.1 Installing DataView ............................................................................................................................... 49
6.2 Megohmmeter Control Panel ............................................................................................................... 52
7. SPECIFICATIONS ............................................................................................... 52
7.1 Reference Conditions .......................................................................................................................... 52
7.2 Electrical Specications ....................................................................................................................... 53
7.2.1 Voltage .......................................................................................................................................53
7.2.2 Current....................................................................................................................................... 53
7.2.3 Insulation Resistance ................................................................................................................ 53
7.2.4 DAR, PI, and DD ........................................................................................................................ 57
7.2.5 Capacitance .............................................................................................................................. 58
Megohmmeter Models 6550/6555
3
7.3 Power Supply ....................................................................................................................................... 58
7.3.1 NiMH Technology ...................................................................................................................... 58
7.3.2 Battery Charger ......................................................................................................................... 58
7.3.3 Optimize Battery Charging ........................................................................................................ 59
7.3.4 Battery Life ................................................................................................................................ 59
7.3.5 “Defect” message .................................................................................................................... 60
7.4 Environmental Specications ............................................................................................................... 60
7.5 Mechanical Specications ................................................................................................................... 60
7.6 Safety Specications ........................................................................................................................... 61
7.6.1 Electromagnetic Compatibility .................................................................................................. 61
7.6.2 Mechanical Protections ............................................................................................................ 61
7.7 Variations in the Domain of Use ...........................................................................................................61
7.8 Inherent and Operating Accuracy ........................................................................................................ 62
8. MAINTENANCE .................................................................................................. 62
8.1 Recharging the Battery ........................................................................................................................ 62
8.2 Replacing the Battery .......................................................................................................................... 63
8.3 Replacing the Fuse .............................................................................................................................. 63
8.4 Cleaning ............................................................................................................................................... 63
8.5 Repair and Calibration ......................................................................................................................... 64
8.6 Technical and Sales Assistance ........................................................................................................... 64
8.7 Limited Warranty .................................................................................................................................. 64
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, le a claim immediately with the
carrier and notify your distributor at once, giving a detailed description of any damage. Save the damaged
packing container to substantiate your claim.
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
Probe - Black Test Probe (1000V CAT IV, 15A, UL) ........................................................................ Cat. #2151.30
Probe - Red Test Probe (1000V CAT IV, 15A, UL) .......................................................................... Cat. #2151.31
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 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 xed test voltage of 500V, 1000V, 2500V, 5000V, 10,000V or 15,000V
- 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
DC
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 ltering 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
■ conguration, 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/
2.3.1 Example of Display Before Measurement
button.
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 conrms 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 conrmed by a second audible beep.
BUTTON DESCRIPTION
TEMP
ALARM
HELP /
• Enter temperature and humidity information and calculate temperature corrected resistance
• Enables/Disables the alarms
• Displays Help information; Enables/Disables the backlighting of the display
MEM
CONFIG
DISPLAY
FILTER
GRAPH
• Stores the measurements
• Conguration 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.
TEMPERATURE
Air Temperature
Humidity
Probe Temperature
Rc Reference Temperature
∆T for R/2
R measured
TEMP
Use the ◄ ►▲▼ arrow buttons to enter the various parameters:
Megohmmeter Models 6550/6555
Rc at --- °C
--- °C
--- %
--- °C
--- °C
--- °C
5.00 GΩ
--- kΩ
9
■ 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, sufcient 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 coefcient ∆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: coefcient dened 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 dened 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 conguration 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
conguration.
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 conguration
screen.
DISPLAY
The second conguration screen depends on the rotary switch setting.
The V-RAMP and V-STEP settings only use the second page of the conguration screen.
The second conguration screen is used to choose:
■ The type of test (Test Type)
■ Nondestructive test (Early Break)
The measurement will be stopped at the rst 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)
dened 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 xed 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 1 2 3
For example for VN = 10,000V :
Current range 1 2 3
Resistance R > 30GW 200MW < R < 16,6GW 10MW* < R < 1 GW
*10MW because Imax = 1mA at 10,000V.
The xed current range remains active until the instrument is switched off.
Megohmmeter Models 6550/6555
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
elds 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 xed. 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.
■ Conrm and exit by pressing the CONFIG button again.
■ If the range is xed, 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 lter 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 modied 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 conguration 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 rst 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 lter for the insulation measurements. This
lter affects only the displayed results (which are smoothed), not the measured values. The recorded data
therefore remains raw (no lter).
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
lter. If that is not enough, go to the DF20s lter, then to the DF40s lter. The larger the time constant, the
smoother (and slower) the measurement.
Successive presses on the FILTER button will modify or remove the lter:
■ DF 10: time constant 10 seconds
■ DF 20: time constant 20 seconds
■ DF 40: time constant 40 seconds
■ DF: automatic lter, adapts the lter time to the resistance result changes.
■ no lter
The lter is calculated as follows:
RN = RN-1 + (R - R
N-1
)/N
If N is set to 20, the time constant of this lter 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 ltering (DF) is recommended for measurements of uctuating high insulation resistance values.
Such uctuations may be due to hand movement, when touching the cables, uctuating 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.
Backlight
■ Press the HELP button to exit.
HELP HELP
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.
English
Français
Deutsch
Italiano
Español
Svenska
Suomi
Dansk
CONFIG
+
SET-UP
MR
Step
Voltage
V RAMP
V VAR
V FIXED
OFF
The language selection menu displays all of the
languages available. Use the ▲▼ keys to choose
your language and press the ◄ key to conrm or ◄
to cancel.
Installing the new language may take up to 30 seconds.
The device then reboots.
20
Norsk
中文
Megohmmeter Models 6550/6555
3.3 Choosing the Measurement of the Lead Compensation
The lead compensation is only possible if the internal rmware 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 rmware, 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
+
FILTER
V RAMP
V VAR
V FIXED
OFF
3.4 Configuring the Instrument (SET-UP)
The Models 6550/6555 are factory congured 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 congured using the CONFIG button or in the SET-UP function.
■ The SET-UP function allows overall conguration of the instrument independently of which
measurement functions are chosen.
■ The CONFIG button allows conguration of the chosen measurement function before and during a
measurement.
A conguration modied 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
Instrument Number
Firmware
Megohmmeter Models 6550/6555
General Settings
Set Default Parameter
Buzzer
Power Down
Baud rate
Date
Time
Temperature Unit
On
38400
2011-05-25
9:41
Celsius
100213
2.5.00
1
21
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.
■ 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
modied.
■ Firmware: Indicates the two version numbers of the rmware in the instrument. This line is informative
and cannot be modied.
3.4.3 Resetting the Default Parameters
To return to the initial conguration, choose Set Default Parameter.
The instrument requests conrmation.
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 rst 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 rst 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 xed voltage, and at a maximum
of 750V for all other xed 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 -:--.
The setting should not be less than 30 seconds, because acquiring a stable resistance result takes 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
Press the ◄ button to exit the menu and return to the main SET-UP menu.
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 nal 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 nal 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 xed
or adjustable voltage and all of them can be modied.
- For a test voltage of 500V, the alarm threshold is
adjustable from 10kΩ to 2TΩ.
- For a test voltage of 1000V, the alarm threshold is
adjustable from 10kΩ to 4TΩ.
- For a test voltage of 2500V, the alarm threshold is
adjustable from 10kΩ to 10TΩ.
- For a test voltage of 5000V, the alarm threshold is
adjustable from 10kΩ to 15TΩ.
- For a test voltage of 10,000V, the alarm threshold
is adjustable from 10kΩ to 25TΩ.
- For a test voltage of 15,000V, the alarm threshold
is adjustable from 10kΩ to 30TΩ.
- 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 rst
SET-UP screen.
Megohmmeter Models 6550/6555
25
4. OPERATION
4.1 Charging the Batteries
NOTE: When using the instrument for the rst 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
2%
Charging
The percentage charge of each of the batteries, their voltages, their
charging currents, their temperatures, and the charging times.
12.4 V
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)
Battery 2
1953 mA
26.4°C
00:05:30
3%
11.7V
13 mA
26.7°C
00:05:20
> 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 rst charge may take longer.
It is possible to charge the instrument during operation. In this case the
symbol ashes.
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
Specic 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 1000V
AC) 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 1000V
AC 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 device generates exactly the voltage selected if the resistance to be measured is indeed greater than
= UN / 1mA. If the resistance measured is ≤ RN , the output voltage is less UN. In this case, use the U-VAR
R
N
function and adjust U so that the voltage displayed during the test is at the desired value (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
SET-UP
50 V
MR
Step
Voltage
V RAMP
V VAR
V FIXED
OFF
There are already 3 preset voltages that can be modied 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 specied: the duration of the initial level, the duration
of the ramp, and the duration of the nal 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 rst 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 inuence 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.
+
G
Outer insulation
Braid
Wire
surrounding
the insulation
Core
Insulation
-
Using the guard eliminates the inuence of the surface leakage current.
A conducting wire must be wrapped around the insulation.
4.4.7 Before the Insulation Measurement
It is possible to congure 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
conguration 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 ltering 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
Set: 500 V
531 nA
Elapsed Time 00:00:23
10
kΩ
100
MΩ
1
10
100
GΩ
1
10
100
TΩ
1
10
If the measurement is unstable, it is possible to apply a digital lter by pressing the FILTER button.
It is possible to view the available result values by pressing the DISPLAY button.
34
Megohmmeter Models 6550/6555
995 MΩ
E-BRK
528 V
Set: 500 V
531 nA
Elapsed Time 00:01:12
DISPLAY
DAR (30s/60s)
PI (1.0m/10m)
Capacitance
1.00
---
---
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
10
kΩ
100
MΩ
1
10
100
1
GΩ
10
209.4 nA
1
100
Remaining
measurement time
TΩ
10
You can view the graphical representation of the measurement results by pressing the GRAPH button.
BURN
946 MΩ 00:02:32
V
510
500
490
480
470
GRAPH
501 V
MΩ
950
925
900
875
850
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 x the measurement range of the current, to add an analog lter
(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.
Megohmmeter Models 6550/6555
35
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 congured 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.
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:
36
Megohmmeter Models 6550/6555
Test with programmed duration
E-BRK
Value of the insulation resistance
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
∆V: difference between the
highest and lowest test voltage
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 signicantly, 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 conguration is changed.
After a test with programmed duration:
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
■ 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 0.4V
N 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
N, the measurement is stopped and the error is indicated.
1.1V
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 inuence 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 inuencing 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
Megohmmeter Models 6550/6555
37
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 reect 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
■ PI = R 10
1 min/R 30s (2 values to be taken during a 1-min measurement)
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 modied in the CONFIG menu or the SET-UP function (see § 3.4), to adapt to
particular applications.
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
Set: 500 V
Elapsed Time 00:10:08
978 nA
kΩ
1
10
START/STOP
10
100
Press the START/STOP button again to stop the measurement.
502 MΩ
502 V
Elapsed Time 00:10:10
DAR (30s/60s)
PI (1.0m/10m)
Capacitance
START/STOP
MΩ
100
GΩ
1
10
100
1
BURN
978 nA
TΩ
10
2.64
1.05
320 nF
38
Megohmmeter Models 6550/6555
■ Automatic Configuration (preferred)
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 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 conguration menu.
DAR or PI is displayed in the top left corner of the display unit to indicate the conguration 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
Megohmmeter Models 6550/6555
PI < 1
1 ≤ PI < 2
Poor or even dangerous
39
1.6 ≤ DAR 4 ≤ PI Excellent
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 rst 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
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 parallelsurface 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 owing 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
40
CONFIG
Megohmmeter Models 6550/6555
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
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.
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
CONFIG
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 conrm and exit the conguration menu. DD or
top left corner of the display unit to indicate the conguration chosen.
■ Press the START/STOP button to start the measurement.
In the Manual Stop + DD conguration, 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 conguration (indicated by the
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.
symbol), the measurement stops automatically.
DD is displayed in the
Megohmmeter Models 6550/6555
41
234.5 MΩ
BURNDD
START/STOP
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
42
Megohmmeter Models 6550/6555
4.7.2 Interpretation of Results
Value of DD Quality insulation
7 < DD Very poor
4 < DD < 7 poor
2 < DD < 4 Borderline
DD < 2 Good
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 owing 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.
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 identied 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 rst available location in memory. It is possible to
modify the proposed location using the ◄ ► and▲▼ arrow buttons.
Store
Obj. Test
01 01
MEMORY
Date Time Fct.
2011-05-26 09:04 500V
MEM
If the screen does not display the measurement and pressing the MEM key has no effect, press the DISPLAY
key twice to restore the result screen, then press the MEM key again.
Megohmmeter Models 6550/6555
43
This May happen following the discharging of a highly capacitive load.
■ Press the MEM button again to conrm 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)
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
measurement does not vary, it will take only one value, giving a perfectly at curve.
This value is recommended to optimize memory use.
MEMORY
Date Time Fct.
2011-05-26 09:04 500V
Yes
Min.
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
sufcient.
■ 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 conrms the storage.
OK
MEM
The measurement is recorded with all its supporting information.
44
Megohmmeter Models 6550/6555
To exit without recording and return to the last measurement, press the ◄ button.
For each new record, the instrument proposes the rst 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.
The bargraph indicates the
quantity of memory used (in
black), the quantity of memory
available (in white).
Store
Obj. Test Date Time Fct.
03 01
02 02
02 01
01 02
01 01
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 number of measurements that can be recorded depends on the number of samples stored for each
measurement.
The instrument store 256 measurements and 80,000 samples associated with these measurements.
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.
SET-UP
MR
Step
Voltage
V RAMP
V VAR
V FIXED
OFF
67 01 08
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.
Megohmmeter Models 6550/6555
45
Obj. Test Date Time Fct.
03 01
02 02
02 01
01 02
01 01
Press the DISPLAY button to see the rest of the recorded information (depending on the currently used function).
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
When the
the graph.
DISPLAY
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.
symbol indicates that the samples have been recorded, you can press the GRAPH button to view
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
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
5.3 Erasing the Memory
Turn the rotary switch to the MR position.
46
Megohmmeter Models 6550/6555
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 conrmation of the deletion.
Store
Obj. Test Date Time Fct.
03 01
02 02
02 01
01 02
01 01
Select OK to conrm 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.
5.3.2 Erasing All Records
Press the CONFIG button. The instrument requests conrmation of the deletion.
Select OK to conrm or CANCEL to cancel.
Megohmmeter Models 6550/6555
47
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 identies 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 qualied 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).
There are three types of error messages:
■ Informative error messages:
48
Megohmmeter Models 6550/6555
The message appears for approximately 1 second. Depending on the error the functionality of the device
may be reduced. A repair is needed if the error recurs.
Errors 04, 06, 07, 20, 21, 23, 30, 31, 32 (see also the second type of error), 40, 41, 42
Error 06 is preceded by an automatic reset.
Errors 04 and 07 are followed by error 06.
Error 20 indicates that a memory operation has failed.
Error 21 indicates that the settings have been automatically reset to default settings.
Error 23 indicates that the battery management is not available and no battery charging is possible.
Error 30 indicates that a resistance measurement has been stopped unexpectedly; check for disturbances.
Errors 31, 32 (see also the second type of error) and 40 indicate that no measurement is possible.
■ Recoverable error messages:
The message disappears if the rotary switch position is changed. Depending on the error the functionality
of the device may be reduced. A repair is needed if the error recurs.
Errors 22, 32 (see also the rst type of error)
Error 32 (see also the rst type of error)) indicates that no measurement is possible.46
■ Fatal error messages:
No operation is possible. Power off the device and power it back on. A repair is needed if the error recurs.
Errors 01, 08, 09
In addition to error messages there are other indications for errors:
■ If the device shows a cross on the screen when powered on and after a few seconds additionally a horizontal
bar on the top of the screen, this indicates that language data is needed.
Use the PC program from our web site (see §6.1) to update rmware and language data.
■ If instead of information on the help screen just the headline “HELP” and below the number 98 or 99 is shown,
this indicates that language data for help is needed.
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.
1. Insert the DataView thumb drive into an available USB port on your computer. If Autorun is enabled, an
AutoPlay window appears on your screen. Click “Open folder to view les” to display the DataView folder.
If Autorun is not enabled or allowed, use Windows Explorer to locate and open the USB drive labeled
“DataView.”
2. When the DataView folder is open, nd the le Setup.exe located in the root directory of the USB drive,
and double-click it to run the installation program.
Megohmmeter Models 6550/6555
49
3. The DataView setup screen appears.
In the upper left corner of the screen, choose the language version of the Setup interface. (All Setup
screens and dialogs will immediately appear in the selected language.)
In the lower left corner are the available installation options. In addition to the DataView software, you can
select “Adobe Reader.” This links to the Adobe web site where you can download the latest version of
Reader. This program is required to view DataView .pdf documents. The option Firmware Upgrades links
to the website where you can check for new rmware updates for the instrument. Finally, User Manuals
displays a list of .pdf les contained in the USB drive that accompanies DataView. (DataView also comes
with a Help system that is installed with the program les.)
To install DataView, select DataView in the Options list and click Install.
4. Select the language version of DataView you want to install (English, French, or Spanish) then click Next.
(By default, the language selected in step 3 is highlighted.)
5. You are now prompted to select the software you want to install. Each AEMC product family has its own
specially designed Control Panel. If you are performing a Complete install, by default all available Control
Panels are selected (a check mark next to the Control Panel indicates it is selected). Control Panels take
up disk space on the computer; so unless you have other types of AEMC instruments, we recommend
50
Megohmmeter Models 6550/6555
that you select Megohmmeter and deselect the rest. You should also check the option DataView Core,
which is a requirement if you plan to create DataView reports.
After you nish selecting and deselecting Control Panels and/or DataView Core, click Next.
6. The Setup program now informs you that it is ready to install DataView. If you want to review any of your
previous selections, click the Previous button to return to earlier screens. Otherwise, click Install to begin
installation.
7. The InstallShield program installs the selected software. If an earlier version of the software is already
installed on your computer, for each selected program the InstallShield program will:
(a) Ask you to conrm the installation of the program. Click Next.
(b) Display a status bar indicating the progress of the installation.
(c) Inform you when the program is installed. Click Finish to install the next selected program.
If the software is not installed (or if the installed software is the same version as the selected software), the
Megohmmeter Models 6550/6555
51
software is installed without requesting conrmation.
When all programs are installed, a message appears informing you of this. Click Finish to return to the
Setup screen
8. You can now select additional Setup options to install (see step 3 above). When nished, click Exit.
9. The DataView folder now appears on your computer desktop, within which is the Megohmmeter icon
and the icon(s) for any other Control Panel(s) you have installed.
6.2 Megohmmeter Control Panel
Clicking the DataView icon in the DataView folder on your desktop opens the core DataView program. Clicking
the Megohmmeter Control Panel icon opens the Megohmmeter Control Panel.
In general, core DataView features are for creating, viewing, editing, and storing DataView reports; while the
Control Panel is for connecting to, conguring, viewing measurements on, and downloading data from the
instrument. You can access all DataView features through either the DataView icon or the Control Panel icon.
For users who interact with megohmmeter instruments, we recommend primarily using the Control Panel.
However, there are situations where using the core DataView icon may be more convenient for some users,
such as when viewing multiple archived reports from different AEMC product families.
For further information about using the Megohmmeter Control Panel, consult the Help system that comes with
the product. Access this Help by clicking the option Help in the Control Panel’s menu bar at the top of the
screen.
7. SPECIFICATIONS
7.1 Reference Conditions
Influence Quantities Reference values
Temperature 23 ± 3°C
Relative Humidity 45 to 55% RH
Supply Voltage 9 to 12V
Frequency Range DC and 15.3 to 65Hz
52
Megohmmeter Models 6550/6555
Capacitance in Parallel on Resistance 0µF
Electric Field null
Magnetic Field <40A/m
The inherent accuracy is the error specied for the reference conditions.
The operating accuracy includes the inherent uncertainty plus variations of the quantities of inuence (supply
voltage, temperature, interference, etc.) as dened 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 0.1V 1V 2V 2V
Accuracy ±(1% +5cts) ±(1% +1ct)
Frequency range DC or 15 to 500Hz DC
■ Input impedance: 3MW
7.2.2 Current
Measurement Range
(DC)
Resolution 1pA 1pA 10pA 100pA 1nA
Accuracy ±(15% + 10cts) ±10% ±5%
Measurement Range
(DC)
Resolution 10nA 100nA 1µA 10µA
Accuracy ±5%
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
4.00 to 39.99µA 40.0 to 399.9µA 400 µA to 3.999mA 4.00 to 9.999mA
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 15,000V
or adjustable from 40 to 10,000VDC and 15,000VDC for the Model 6555
Inherent accuracy ±1%
adjustable from 40 to 10,000VDC in 10-V steps
adjustable from 1000 to 15,000V
DC in 100-V steps
DC for the Model 6555
■ Maximum current: ≤1mA
DC from 40 to 999V
5 to 0.2mADC from 1000 to 15,000V. The user can adjust this current.
Megohmmeter Models 6550/6555
53
■ Maximum acceptable peak AC voltage at terminals during measurement:
0.4VN or 1000VAC maximum
■ Short-circuit current: ≤5mA
DC ±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) 0.22 0.46 0.93 1.07 1.07 5 5 2 1 0.5
P (W) ≤ 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 1kW 10kW 100kW 1MW 10MW
Accuracy ±(5% + 3cts)
Operating error ±(10% + 6cts)
10 to 999kW
1.000 to 3.999MW
4.00 to 39.99MW 40.0 to 399.9MW 400 to 3.999GW 4.00 to 39.99GW
Test Voltage (V)
Specified
measurement range
Resolution 100MW 1GW 1GW 10GW 10GW
Accuracy ±(15% + 10cts) ±(20% + 10cts)
Operating error ±(20% + 15cts) ±(30% + 15cts)
Test Voltage (V) ≥10,000 15,000 (6555 only)
Specified measurement range 4.00 to 25.00TW 4.00 to 29.00TW
Resolution 10GW 10GW
Inherent accuracy ±(20% + 10cts) ±(20% + 10cts)
Operating error ±(30% + 15cts)
500 - 1000 - 2500 - 5000
10,000 - 15,000
40.0 to 399.9GW
400 to 999GW
1.000 to 1.999TW
≥1000 ≥2500 ≥5000
2.000 to 3.999TW 4.00 to 10.00TW 4.00 to 15.00TW
■ Variable test voltage
Minimum resistance measured = 10kΩ
Maximum resistance measured = to be interpolated from the values in the tables of xed test voltages above.
The inherent uncertainty depends on the test voltage and on the resistance measured. It can be interpolated
from the tables of xed test voltages.
■ Typical discharge time of a capacitive element to reach 25 V
Test Voltage 50V 100V 250V 500V 1000V 2500V
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
DC
Test Voltage 5000V 10,000V 15,000V
54
Megohmmeter Models 6550/6555
Discharge Time (C at µF) 14 s x C 27 s x C 57 s x C
T
T
■ 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
1000V Range
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
Megohmmeter Models 6550/6555
55
2500V Range
T
T
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
5000V Range
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
56
Megohmmeter Models 6550/6555
10,000V Range
T
T
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
16000
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
Megohmmeter Models 6550/6555
10 T 100
57
Measurement Range 0.02 to 50.00
Resolution 0.01
Accuracy ± (5% + 1ct)
■ Calculation of the DD term
Measurement Range 0.02 to 50.00
Resolution 0.01
Accuracy ±( 10% + 1ct)
7.2.5 Capacitance
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 19.99µF
Resolution 1nF 10nF
Accuracy* ± (10% + 1 ct) ± 10%
*specied only for a test voltage ≥500V
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.
58
Megohmmeter Models 6550/6555
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 rst time. However, we recommend
making the rst 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 signicant 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).
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)
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.
1515 12 2 2 22 2 25
Megohmmeter Models 6550/6555
59
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).
7.4 Environmental Specifications
■ Range of use
The relative humidity can signicantly 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)
60
Megohmmeter Models 6550/6555
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
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
9 to 12V
10 to 75% RH
with t ≤ 35°C
U >7.5kV and R < 10TWW
M
MWW (40GWW to 10TWW)
U > 7.5 kV and 3TW < R < 10TWW
V
WW
M
V
W W - GW W
M
V
WW (10kWW to 40GWW)
(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)
Megohmmeter Models 6550/6555
61
Frequency 15 to 500Hz V ±3% ±(0.5% + 1ct)
AC voltage superimposed
on test voltage
(1): The DAR, PI and DD terms and the capacitance and leakage current measurements are included in the quantity “MΩ”.
0 to 20%Vn M
WW ±0.1%/%Vn ±(0.5%/%Vn + 5cts)
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 = inuence of the reference position ±90°
E2 = inuence of the supply voltage within the limits indicated by the manufacturer
E3 = inuence of the temperature between 0° and 35°C
Specications are subject to change without notice.
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
■ Signicantly 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 dened in the operating manual
62
Megohmmeter Models 6550/6555
■ Comply with the storage conditions specied in the operating manual
Before rst 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
by its service center or by an approved repair center.
will not be held responsible for any accident, incident, or malfunction following a repair done other than
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
Megohmmeter Models 6550/6555
63
8.5 Repair and Calibration
To ensure that your instrument meets factory specications, 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 certicate plus recorded calibration data).
Ship To: Chauvin Arnoux
15 Faraday Drive
Dover, NH 03820 USA
Phone: (800) 945-2362 (Ext. 360) • (603) 749-6434 (Ext. 360)
Fax: (603) 742-2346 or (603) 749-6309
E-mail: repair@aemc.com
(Or contact your authorized distributor)
Costs for repair, standard calibration, and calibration traceable to N.I.S.T. are available.
NOTE: You must obtain a CSA# before returning any instrument.
®
, Inc. d.b.a. AEMC® Instruments
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: (508) 698-2118
E-mail: techsupport@aemc.com
8.7 Limited Warranty
The Models 6550/6555 are warranted to the owner for a period of two years from the date of original purchase
against defects in manufacture. This limited warranty is given by AEMC
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 warranty period, you may return the instrument to us for repair, provided we
have your warranty registration information on le or a proof of purchase. AEMC
repair or replace the faulty material.
®
Instruments, not by the distributor
®
Instruments will, at its option,
64
Megohmmeter Models 6550/6555
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
15 Faraday Drive
Dover, NH 03820 USA
Phone: (800) 945-2362 (Ext. 360)
(603) 749-6434 (Ext. 360)
Fax: (603) 742-2346 or (603) 749-6309
E-mail: repair@aemc.com
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.
, Inc. d.b.a. AEMC® Instruments
Megohmmeter Models 6550/6555
65
07/20
99-MAN 100374 v18
Chauvin Arnoux
®
, Inc. d.b.a. AEMC® Instruments
15 Faraday Drive • Dover, NH 03820 USA • Phone: (603) 749-6434 • Fax: (603) 742-2346
www.aemc.com
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