Page 1
User guide
MOM2
MOM2 Win
Micro-ohmmeter
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Art No. ZP-BD03E Doc. BD0333JE V09a 2020
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MOM2
NOTICE OF COPYRIGHT & PROPRIETARY RIGHTS
© 2013-2020, Megger Sweden AB. All rights reserved.
The contents of this manual are the property of Megger Sweden AB. No part of this work may be reproduced or transmitted in any form or
by any means, except as permitted in written license agreement with Megger Sweden AB. Megger Sweden AB has made every reasonable
attempt to ensure the completeness and accuracy of this document. However, the information contained in this manual is subject to change
without notice, and does not represent a commitment on the part of Megger Sweden AB. Any attached hardware schematics and technical
descriptions, or software listings that disclose source code, are for informational purposes only. Reproduction in whole or in part to create
working hardware or software for other than Megger Sweden AB products is strictly prohibited, except as permitted by written license
agreement with Megger Sweden AB.
TRADEMARK NOTICES
Megger® and Programma® are trademarks registered in the U.S. and other countries. All other brand and product names mentioned in this
document are trademarks or registered trademarks of their respective companies.
Megger Sweden AB is certified according to ISO 9001 and 14001.
MOM2 Win
Micro-ohmmeter
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Contents
1 Safety
................................................................... 6
1.1 Safety instructions ............................................... 6
1.2 Symbols on the instrument ................................. 7
2 Introduction
................................................................... 8
2.1 General ............................................................... 8
Unpack system ................................................... 8
2.2 Service and support ............................................ 8
Training .............................................................. 8
Contact information ........................................... 8
2.3 Basic technical description ................................... 9
Kelvin test ........................................................... 9
2.4 DualGround – Both sides grounded .................... 9
3 MOM2 overview
................................................................. 10
3.1 The instrument ................................................. 10
3.2 Included accessories .......................................... 12
3.3 Optional accessories .......................................... 13
4 Functions and set up
................................................................. 14
4.1 General ............................................................. 14
Internal software version ................................... 14
4.2 Test positions .................................................... 14
4.3 Bluetooth –
SET / ............................................................. 15
4.4 Clock – CLK ...................................................... 16
SET / CLK ........................................................... 16
4.5 Minimum current – I min .................................. 17
SET / I min.......................................................... 17
4.6 Data logger – LOG ............................................ 17
SET / LOG .......................................................... 17
4.7 Pass/Fail – P/F .................................................... 18
SET / P/F ............................................................. 18
4.8
PC communication – PC COM ...............................19
PC COM ........................................................... 19
4.9 Audio signals .................................................... 19
4.10 Battery power supply ...................................... 20
Charging .......................................................... 20
Battery practice ................................................. 20
.................................. 15
5 Operating instructions
................................................................. 22
5.1 General instructions .......................................... 22
Important regarding all testing .......................... 22
Power supply ................................................. 22
LCD display ....................................................... 22
To choose measurement time............................22
To choose I > I min or I = I max ............................. 22
Working at low temperatures ...........................23
Kelvin Clamp/Probe practice..............................23
Save test results ................................................ 23
Hold present test result ..................................... 23
Delete present test result ..................................23
Recalling test results from the log .....................23
Delete results in the log ....................................23
Delete all results in the log ................................ 23
5.2 Measurement with max. charge, I=IMAX ......... 24
5.3 Measurement with minimum current guaran-
tee, I > Imin ..................................................... 25
5.4 Measurement using P/F – pass/fail ..................... 26
5.5 Measurement with user defined settings ........... 27
5.6 Measurement using the LOG function ............... 27
Running numbers mode ................................... 27
Circuit breaker testing mode ............................. 27
5.7 Measurement using P/F and Imin ..................... 29
5.8 Testing on circuit breakers having a current
transformer in the loop .................................... 30
5.9 Trouble shooting ............................................... 30
Error messages..................................................30
6 Application examples
................................................................. 32
6.1 Safety ............................................................... 32
Important regarding all testing .......................... 32
6.2 Measurement using Kelvin probes ..................... 32
6.3 Test a CB using DualGround .............................. 33
6.4 Test a CB by injecting through the ground
cables .............................................................. 33
Disconnection ................................................... 33
7 MOM2 Win
................................................................. 34
7.1 Introduction ...................................................... 34
Download software ..........................................34
7.2 MOM2 Win installation ..................................... 34
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Preconditions .................................................... 34
Setup ................................................................ 34
Select language ................................................ 34
7.3 Start MOM2 Win .............................................. 35
Exit MOM2 Win ................................................ 35
7.4 Connecting to MOM2 ....................................... 35
Automatic connecting ...................................... 35
Manual connecting ........................................... 35
7.5 Read the measurement log ............................... 37
Export data to file ............................................. 38
Delete all data on the instrument ...................... 38
7.6 User settings ..................................................... 39
Read existing settings ....................................... 39
Program "User" positions ................................. 39
7.7 Calibration ........................................................ 40
Procedure .........................................................40
Voltmeter calibration ........................................40
Ammeter calibration ......................................... 40
Calibration report .............................................41
8 Specifications
................................................................. 42
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1 SAFETY
1
Safety
1.1 Safety instructions
For your own safety and to get the maximum benefit
from your instrument, please ensure that you read
and understand the following safety instructions and
warnings before using the instrument.
Read and comply with the following
instructions.
Important
Warning
Connecting – before test
1.
Before measuring resistance in circuit breakers
or disconnecting switches (isolators), always
check to see that the object being tested is
closed and grounded at least on one side.
2.
Do not connect the instrument to inductive
loads if not necessary. This can cause high voltages when removing the current clamps and
possibly damage MOM2.
3.
Always connect the protective ground on
MOM2 before making any other connections.
4.
Always connect the test cables to MOM2 before connecting them to the test object.
5.
Never connect MOM2 to live circuits.
During test
1.
The rising current waveforms produced by the
instrument may induce enough current into
the secondary of a current transformer (CT)
circuit to actuate a protective relay.
If there is a CT in the current circuit, the protective relay equipment that is connected to it
must be blocked to prevent actuation.
After completing the measurements, you can
follow the normal procedures that are used to
demagnetize current transformer cores after
DC has passed through their current transformer.
Always comply with local safety
regulations.
Disconnecting – after test
1.
First, disconnect all test cables from the test
object and then disconnect them from MOM2.
Last, disconnect the protective ground from
MOM2.
Important
1.
The instrument is intended for use in industrial
environment. It generates, uses and can radiate radio frequency energy and, if not installed
and used in accordance with these instructions
it may cause interference to other devices
in the vicinity. If this equipment does cause
interference with other devices, which can be
determined by turning the equipment off and
on, the user is encouraged to try to correct the
interference by one or more of the following
measures:
▪
Reorient or relocate the receiving device.
▪ Increase the separation between the equipments.
▪ Consult the manufacturer or field service
technician for help.
2.
Never leave the MOM2 unattended while it is
turned on.
3.
Do not use any accessories that are not intended for use together with the instrument.
4.
It is not possible to use the MOM2 for testing
during battery charging.
5.
Use a damp cloth for cleaning. Do not use
liquid cleaners or aerosol cleaners.
6.
Do not attempt to service the instrument yourself. If you attempt to service the instrument
yourself the warranty is no longer valid. Refer
all servicing to Megger authorized personnel.
7.
If you need to return the instrument, please
use either the original crate or one of equivalent strength.
2.
Never open a circuit breaker while MOM2 is
connected to it.
3.
Connection points for current cables can become hot during current generation.
4.
High current on output terminals.
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1.2 Symbols on the
instrument
Caution, refer to accompanying documents.
Protective conductor terminal.
WEEE, Waste Electrical and Electronic
Equipment. Please utilize your local WEEE collection facilities in the
disposal of this product and otherwise
observe all applicable requirements.
Equipment complies with current EU
directives.
Information duty regarding substances
on REACH article 33, SVHC-list
1 SAFETY
This product contains a coin cell battery which contains 1,2- dimethoxyethane (CAS 110-71-4) above
0.1% by weight.
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2 INTRODUCTION
2
Introduction
2.1 General
The MOM2 is designed to measure the resistance of
circuit breaker contacts, bus-bar joints, contact elements in bus-bars and other high-current links.
When contact resistance rises because of oxidation,
loosened or improperly tightened threaded joints,
temperatures rise abnormally at the points of contact.
This abnormal heating reduces conductivity thereby
accelerating the rise in temperature — and this often
leads to serious trouble.
The MOM2 micro-ohmmeter can be used to detect
such problems early so that they can be remedied
long before trouble starts. Checking contact resistance
at regular intervals provides a clear indication of the
state of your system.
Unpack system
Unpack the unit and check for evidence of any shipping damage. If there is any visual damage, immediately notify the freight carrier to make a damage
claim, and notify Megger of the damage.
2.2 Service and support
For technical assistance please contact your local
representative or direct your request to Megger in
Sweden.
When sending the instrument, please use either the
original crate or one of equivalent strength.
Add the return authorization number to the address
label of the shipping container for proper identification and quicker handling.
Note
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2 INTRODUCTION
2.3 Basic technical
description
The output current is delivered from a supercapacitor
which is charged from the built-in rechargeable batteries.
Kelvin test
The MOM2 uses Kelvin probes or clamps for the
measurement. A Kelvin test uses four wires and measures continuity resistances ensuring all contact and
lead resistances are compensated for, which allows a
much greater accuracy in measurements. Each Kelvin
probe assembly has two probe tips. When contacting
the test object it will be contacted with two plus two
probe tips. One pair is for the current generated. The
other pair will measure the very small voltage present.
2.4 DualGround – Both sides grounded
With MOM2 it is possible to make measurements
according to the DualGround™ method. The most important advantage is improved safety but the method
is also easier and saves time. The number of tasks is
reduced when the ground cable does not need to be
disconnected and reconnected. Permission related
work that may include paper work could many times
be avoided. However, the local safety regulations shall
always be followed.
Using the DualGround method might cause a small
measurement error cause by the current running
through the ground loop. The error value depends on
the relation between the two parallel circuits.
Example: If the test object is 50 µ and ground loop
is 10 m the error will be 0.5%
Two 10 m, 95 mm
of around 3.6 m. Transitional resistance in connections and clamps to be added.
2
grounding cables has a resistance
Principle for the 4 wire Kelvin test.
With both sides grounded the induced current will not pass
through the test instrument.
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3 MOM2 OVERVIEW
1
MOM2 overview
3
3.1 The instrument
3
5
2
4
6
7
Top view
9 10
12
8
13 14
11
Bottom view
1.
Current output terminal (-)
2.
Current output terminal (+)
3.
Protective conductor terminal
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3 MOM2 OVERVIEW
4.
Display
▪ The display offers a combination of analogue arc and a
dual digital readout:
▪ Analogue arc:
Shows the capacitor charge.
▪ Dual digital display:
Large main digital readout for good visibility of all main
measurement results
Second digital display for additional data.
5.
Keys
Keys for navigation and to make settings in the
display .
◀ ▶
▲ ▼
Left, right is used to navigate between
characters/digits.
Up, down is used to change each
character/digit.
OK Press and hold to enable edit of pa-
rameters select and confirm parameters. Press shortly to confirm.
Backlight
Automatic switch off after 20 s.
C Clear / Cancel
6.
TEST button
8.
Function selector
OFF
I > I min
I = I max
SET
PC COM
USER
0.1 s Test positions
0.6 s
3 s
Measurement time with
minimum current guarantee
0.1 s Test positions
0.6 s
3 s
Measurement time with
max. charge
Bluetooth “pair units”
Set date and time
CLK
▪
▪ Set volume for the internal
buzzer
▪ Discharge the MOM2 internal
capacitor
I min Minimum current guaran-
tee setting
LOG Data log settings
P/F Pass/Fail settings
PC communication (dump
data to PC)
1 Test positions
2
3
Stored settings (Set from
PC SW)
When the function selector is in any of the positions I > I min , I = I max or USER measurement is performed by pressing the button.
7.
Stand-by / Wake up
Press shortly to toggle
Clear log
(Press and hold for 5 s)
9.
Input for sensing voltage (-)
Connector for the negative test lead.
10.
Input for sensing voltage (+)
11.
Connector for trigger
12.
Battery lid
13.
Connector for the battery charger
14.
Battery charging indicator
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3 MOM2 OVERVIEW
3.2 Included accessories
▪ Test cables with Kelvin probes (one with trigger)
or
Test cables with Kelvin clamps
▪ Transport case
▪ Charger
▪ Rubber holster
▪ Carrying strap
▪ Belt clip
▪ MOM2 Win
Test cables with Kelvin probes (incl. in BD-59090)
Belt clip (50-11010)
(GA-90000)
(GA-90001)
Test cables with Kelvin clamps (incl. in BD-59092)
Carrying strap (50-11011) and rubber holster (55-1307)
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3.3 Optional accessories
3 MOM2 OVERVIEW
Test cables with Kelvin probes (current & sense)
2 x 1.3 m (4 ft) (one with trig button), 16 mm
Test cables with Kelvin clamps (current & sense)
1.3 m (4 ft) red, 3 m (10 ft) black, 16 mm
Test cable with Kelvin probe
1.3 m (4 ft) red, 16 mm
Test cable with Kelvin probe
1.3 m (4 ft) black, 16 mm
Test cable with Kelvin clamp
3 m (10 ft) black, 16 mm
Test cable with Kelvin clamp
1.3 m (4 ft) red, 16 mm
Test cable with Kelvin clamp
5 m (16 ft) black, 25 mm
Test cable with Kelvin clamp
10 m (33 ft) black, 16 mm
2
(with trig button) GA- 00370
2
2
2
2
2
2
2
GA-90000
GA-90001
GA-00371
GA- 00372
GA-00373
GA - 0 0374
This length in combination with the cable area
16 mm2 results in a reduction of maximum current GA-00376
Cable kit 5 m
Current cable 0.5 m (1.6 ft), Connection plate and
sense cables 5 m (16 ft), Ground cable
GA-00380
Cable kit 10 m
Current cable 0.5 m (1.6 ft), Connection plate and
sense cables 10 m (33 ft), Ground cable
GA-00382
Cable kit 15 m
Current cable 0.5 m (1.6 ft), Connection plate and
sense cables 15 m (49 ft), Ground cable
Calibration kit
GA-00384
BD-90002
Soft carrying case
For MOM2, Charger and Cables
GD- 00620
Cable kit 5 m, (GA-00380)
(BD-90002)
Calibration kit
(GD-00620)
Soft carrying case
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4 FUNCTIONS AND SET UP
4
Functions and set up
4.1 General
Internal software version
When turning the function selector from OFF to any
position the display will shortly show a number e.g.
008 and then during five seconds the internal software version e.g. "01C" (revision R01C).
4.2 Test positions
I > I min
Minimum current is set in position SET / I min.
Generation / measurement time: 0.1 s, 0.6 s or 3 s.
I = I max
The current is only limited by the total impedance of
the circuit.
Generation / measurement time: 0.1 s, 0.6 s or 3 s.
USER / 1, 2, 3
User defined settings as generation time, I min, pass/
fail and log.
Note The user defined settings can only be set via
MOM2 Win from a PC
OFF
The instrument should be in the OFF position when
not in use.
Note The MOM2 will go to stand by mode after
about 10 minutes of inactivity. To wake up,
press Stand-by / Wake up (CLR LOG) button.
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4 FUNCTIONS AND SET UP
4.3 Bluetooth –
Megger do not sell Bluetooth headset.
However, bluetooth headsets can be used with
MOM2. Follow instruction below.
SET /
Display abbreviations
SEt Set
SPC Set-up PC
SHS Set-up headset
Prd Paired
E-d Enable / Disable (headset)
EnA Enabled (headset)
dIS Disabled (headset)
o Processing
ErA Erase all addresses
Enable / Disable Bluetooth
Use the ◀ ▶ keys to find "E-d".
1]
The installation now takes place and installation gets finished. Display on MOM2 shows
“Prd” and setup is complete.
8] Check also the device manager and double
click on
MOM2
comes up in the list.
Bluetooth
and check that the
Megger
9] Check that the MOM2 Win can communicate
with the MOM2.
10] Turn the function selector to the PC COM
position on the MOM2 panel.
11] Start the MOM2 Wi. The software shall now
read out the s/n on the MOM2 and the connected port.
Note The procedure to pair and assign com port
varies depending on the equipment.
How to pair a headset
Select SET / on the MOM2.
1]
2] Use the ◀ ▶ keys to find out that Bluetooth
is enabled, "EnA".
2] Press OK to toggle between "EnA" (Enabled
and "diS" (Disabled).
Note Do not use the PC COM mode if there is a
requirement for non-electromagnetic interference in the environment.
The PC COM position is always enabled as it
overrides the disable setting.
Set up Bluetooth
Select SET / on the MOM2.
1]
2] Press ▶, "SPC" will be shown.
3] Press "OK. Display will show "o".
The MOM2 is now visible in the Bluetooth
network and ready to be paired.
3] Press right arrow key twice.
The display shows “SHS”
4] Set the headset in pair mode (See the instruc-
tions for the headset.)
5] Press the OK key on the MOM2.
6] When the display shows “Prd” the pairing is
ready.
How to start the headset
See the instructions for the headset
1]
4] Open up the Control Panel on the PC.
5] Select “Add a device” from the control panel.
The computer searches for MOM2 and after
a while the MOM2 device is found.
6] Select the MOM2 item and press “Next”.
After this, a menu appears that asks for the
passcode.
7] Enter code 0000 and press Next.
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4 FUNCTIONS AND SET UP
4.4 Clock – CLK
SET / CLK
There are three functions in this position:
A] Set date and time.
B] Set volume for the internal buzzer.
C] Discharge the MOM2 internal capacitor, (used
for service only).
Display abbreviations
CLC Clock
UOL Volume
dIS Discharge (used for service only)
yy Year
non Month
dd Day
HH Hour
nIn Minute
Date and time
Select SET / CLC
1]
4] Set level (1 to 5) using the ▲ ▼ keys.
5] Press OK key.
6] Press ▶ or ◀ to return.
2] Press and hold OK key until digits start to
blink under the "yy" letters.
3] Set year using the ▲ ▼ keys.
4] Press OK key.
5] Press the ▶ key to go further and set month,
day, hour an minute in the same way as
above.
6] Press C key to return.
Volume for buzzer
Select SET / CLC
1]
2] Press ▶ key, "UOL" is shown.
3] Press and hold OK key until digit start to blink.
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4 FUNCTIONS AND SET UP
4.5 Minimum current – I
min
SET / I min
Display abbreviations
SEL Select
Set-up
Select SET / I min. Present setting is displayed.
1]
2] Press and hold OK key until digits start to
blink under the "SEL" letters.
3] Select value, 50 or 100, using the ▲ ▼ keys.
4.6 Data logger – LOG
The data memory can store totally 104 measurements
and this capacity is shared by the two log modes.
SET / LOG
Display abbreviations / description
SEL Select
oFF OFF
1A1 Label for Breaker, Phase, Interrupter
1234 Running numbers
LOG modes
OFF
4] Press OK key to confirm.
To cancel press C key or turn the function
selector to another position.
Result after a measurement
If the chosen value is not reached during a measurement it will result in a notification on the display and
by an audio signal.
Picture shows an example after a measurement. The I min
limit "50 A" has not been achieved, indicated by the "<"
character to the left.
The current measured during the test is shown in the upper
row. The value shown toggles between the max and min
current during the test. In this case it is the minimum current showing "> 037 A".
When the log is OFF only the latest value is stored and only
until the performance of a following measurement, which
overwrites the previous one.
Circuit breaker testing mode,1A1
This mode is primarily designed for measurement on circuit
breakers. The three characters (1A1) are supposed to indicate: Breaker, Phase, Interrupter.
Measurement is automatically stored, provided that
there are less than three measurements stored on the
selected object label. Each label can store three measurements. See also section 5.6 Measurement using
the log function.
Running numbers mode, 1234
The measurements are numbered in numerical order (1 to
1999)
Measurement is automatically stored, provided that
the memory is not full.
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4 FUNCTIONS AND SET UP
Set-up
Select SET / LOG. Present setting is displayed.
1]
2] Press and hold OK key until characters start
to blink under the "SEL" letters.
3] Use the ▲ ▼ keys to select mode.
4] Press OK key.
4.7 Pass/Fail – P/F
In the P/F position you can enable and set the limit for
the Pass/Fail function. If the measured value exceeds
the set limit it will result in a notification on the display and by an audio signal
SET / P/F
Display abbreviations
SEL Select
oFF OFF
Set-up
Select SET / P/F. Present setting is displayed.
1]
2] Press and hold OK key until character, "<" or
"oFF" start to blink.
3] Select "oFF" or a value using the ▲ ▼ keys.
4] Use the keys ▶ ◀ to select the digit to
change, it will blink.
5] Use the keys ▲ ▼ keys to set the desired
value.
6] Press OK key.
To cancel press C key or turn the function
selector to another position.
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4 FUNCTIONS AND SET UP
4.8
PC communication – PC
COM
The PC COM position is used for all operations performed from a PC using MOM2 Win. You can:
▪
Dump measurement data from the MOM2
▪ Delete all measurements in the data log
▪ Program "User" positions
▪ Set MOM2 clock
▪ Calibrate
PC COM
Display abbreviations
rEn Remote
Set-up
The following is needed:
▪
A PC with MOM2 Win installed
See chapter 8 MOM2 Win
▪ A PC connected via Bluetooth
See section "Bluetooth set up"
4.9 Audio signals
The MOM2 emits different sounds to give an audible
information / confirmation of an event / action. The
sound is emitted from a built-in buzzer and from the
Bluetooth headset (optional). The audio signals vary in
frequency, Low / High, and composition.
Audio signals Description
The MOM2 is charging the
◼ ◼ ◼ . . .
◼ ◼ ◼ ◼ . . .
◼◼
◼ ◼
◼◼ ◼
capacitor and is not ready for
measurement.
Battery low
During capacitor charge
Measurement in progress
Pass signal
Measurement complete / Pass
Wake up
Fail signal
Measurement complete / Fail
Label full
Stand-by
◼
◼ ◼◼
◼ ◼
◼ ◼
Legend
◼
◼◼
◼
◼◼
. . .
When pressing Test / Trigger
while lock symbol is shown
Delete confirmed
When press and hold the
Test / Trigger
Note: Only in LOG mode
Hold
When pressing Test / Trigger
Note: Only in LOG mode
Release
When pressing Test / Trigger
Note: Only in LOG mode
Short - High tone
Long - High tone
Short - Low tone
Long - Low tone
Continuous
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4 FUNCTIONS AND SET UP
4.10 Battery power supply
Charging
Before using the MOM2 the batteries should be
charged. Use the supplied charger and connect it
to the socket at the bottom of the MOM2. Typical
recharge time for fully discharged batteries is 3 hours,
at 25°C (77°F).
Tip Place the MOM2 upside down to get better
the cooling of the batteries.
Important
MOM2 cannot be used for testing during
charging.
Replacing the batteries
1] Loosen the two screws that holds the battery
plate at the back of MOM2, see figure below.
It is recommended to use the same type of batteries
(AA (HR6) 2700 mAh NiMH) as the original ones.
Note
It is possible to use standard (non-rechargeable)
alkaline cells but then only for test using the 0.1 s
measurement position and I > I min.
LED
indicator
Green Fully charged
Yellow
Green
Red
Yellow
Green
Red
Green
Red Fault state. Wrong
None Battery fault /
Description Clarification /
Charging
Temperature limits
exceeded during
the charging.
Temperature limits
exceeded, too
high or too low,
before charging.
battery type,
faulty battery.
missing or other
fault
Remedy
Charging will restart
when temperature
has decreased.
Charging will start
when temperature is
within the limits.
Disconnect the
charger and check
the batteries.
Check batteries and
charger / cables
Loosen the two screws that holds the battery lid at the back
of MOM2.
Important
Always replace all batteries at the same
time.
Do not mix old and new batteries.
Do not mix types or brands.
Battery practice
▪ To extend the battery life cycle time it is a good practice
to recondition the batteries in a separate charger that has
recondition options like refresh / discharge. It is a good
idea to condition the batteries once in about 6 months or
after around 12 regular charge cycles to get the most out
of them.
▪ To prevent the batteries from becoming fully discharged,
if MOM2 is not used regularly, a good rule of thumb is to
charge the batteries every month.
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Note: If the batteries are fully discharged it will be
impossible to charge them in the MOM2.
However, a separate battery charger may be
able to charge the batteries.
4 FUNCTIONS AND SET UP
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5 OPERATING INSTRUCTIONS
Operating instructions
5
5.1 General instructions
Important regarding all testing
Read and comply with the
safety instructions.
Important
Power supply
Prepare testing by charging the batteries se section
4.10 Battery power supply.
Note The MOM2 cannot be used for testing during
battery charging.
LCD display
The display can be backlighted by pressing the key .
It is switched off automatically after 20 seconds.
1 42 3
Always comply with local
safety regulations.
5 6 7
5.
Warning
See section 5.8 Troubleshooting
6.
Pass/Fail indicator
In this case the Pass/Fail is set to 100
7.
Padlock symbol
The lock symbol is shown when the capacitor is
charged prior to a test and when you lock a test
result.
1.
Analogue arc
Indicates level of the capacitor charge
2.
Measurement label
In this case the instrument is set in Running numbers
mode (SET / LOG)
3.
Measurement result
4.
Battery charge indicator
To choose measurement time
In an environment without electrical interference it is
wise to choose the shortest measurement time, which
means that you can get the largest number of measurements on a single battery charge.
Note The shortest measurement time (0.1 s) is not
suitable in environments with a frequency of
16 2 / 3 Hz.
Tip: Start making three tests with the shortest
measurement time to figure out if the results
vary. If they do not differ significantly - use 0.1
s for the tests.
To choose I > I min or I = I max
If you want maximum current for the test, choose
I = I max. The capacitor will be charged to its maximum and requires much energy from the batteries.
If lower current is sufficient for the measurement,
it is advisable to use the I > I min position. In the
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5 OPERATING INSTRUCTIONS
SET / I min position you select the minimum current to
be 50 A or 100 A.
Min current guarantee
(I > I min)
Suitable for test objects ≤ 2 m Recommended for test objects
Capacitor only charged to
sufficient level to generate
selected minimum current for
set time
Saves instrument battery
Allows for shorter time
between tests
Note If you get varying measurement results using
the I > I min position, change to I = I max.
Max current
(I = I max)
> 2 m
Capacitor is fully charged
Will push as much current
as possible through the test
object for set time. Current is
determined as: I ≈ 2.5 V / [test
object R + 0.01 ] A
Requires longer capacitor
recharge times
Working at low temperatures
MOM2 can be operated down to -20°C provided that
the batteries keep a temperature over 0°C. When the
instrument is in use the batteries will generate heat
enough to keep themselves warm.
Kelvin Clamp/Probe practice
2] To unlock, press shortly the trigger on the
Kelvin probe or the TEST button.
Delete present test result
1] Press and hold, about 1 s, the trigger on the
Kelvin probe or the TEST button just after a
measurement.
The latest test result is deleted from screen
and log. This is also confirmed by an audio
signal.
Note This is also possible to carry out when the
result is locked on display.
Recalling test results from the log
1] Saved results can be recalled by scrolling to
desired label using the ▲▼ keys.
Delete results in the log
1] Select label using the ▲▼ ◀ ▶ keys.
2] By pressing the C key the display will prompt
"CLR" in big characters.
Important
To avoid adding unwanted transition
resistances to the measurement result the
Kelvin clamps or Kelvin probes shall be
connected directly to the test object and
not to e.g. a bolt head.
In some cases it might be advisable to use
separate sense cables, forming a conventional four point measurement, in order
to get a more accurate voltage sense.
Save test results
A] When LOG is activated measurement results
are automatically saved in the memory.
B] When the log is OFF only the latest value
is stored and only until the performance of a
following measurement, which overwrites the
previous one.
Hold present test result
3] Delete by pressing the OK key. Cancel can be
done by pressing the C key.
Note In Circuit breaker testing mode the measure-
ment results will be deleted one at a time.
Delete all results in the log
1] Press and hold, for 5 s, the red button below
the TEST button.
Note This will delete the log memory for both log
modes, Circuit breaker testing and Running
numbers.
When the LOG function is activated the measurement
result is shown on the display for about 3 seconds.
After that it is stored in the memory. If you want to
study the result longer you can lock the display view
by doing as follows.
1] Press shortly the trigger on the Kelvin probe
or the TEST button just after a measurement.
The latest test result is locked and shown on
the display. This is confirmed by a padlock
symbol on the display and an audio signal.
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5 OPERATING INSTRUCTIONS
5.2 Measurement with
max. charge, I=IMAX
1] Read the section 5.1 General instructions.
2] If applicable, connect the ground cable (pro-
tective earth).
3] Make the desired settings in the SET options.
In this example LOG and P / F are disabled (set
to OFF).
4] Attach the test cables.
5] Turn the function selector to desired I = I max
position.
The instrument indicates that it is charging
the capacitor by a repeated sound and on
the display shows alternating "CAP" and
"CHG" and the lock symbol.
ing the test. "268 A" and "250 A"
Pictures shows the two display views..
Charging
6] The MOM2 is ready for a measurement when
the lock symbol disappears.
Ready for test
7] Press the TEST button on MOM2 or the pull
the trigger on the probe.
A continuous audio signal tells that the
measurement is in progress.
Two short signals tells that the measurement
is complete.
8] The result is shown on the display, see figures
below.
Over the resistance value "100 μΩ" toggles
the maximal and minimal current values dur-
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5 OPERATING INSTRUCTIONS
5.3 Measurement
with minimum current
guarantee, I > Imin
1] Read the section 5.1 General instructions.
2] If applicable, connect the ground cable (pro-
tective earth).
3] Make the desired settings in the SET options.
Select I min to 50 or 100 A (in this example
set to 100 A).
In this example LOG and P / F are disabled (set
to OFF).
4] Attach the test cables.
5] Turn the function selector to desired I > I min
position.
The instrument indicates that it is charging
the capacitor by a repeated sound and on
the display shows alternating "CAP" and
"CHG" as well as the padlock symbol.
A] If the current value is over the set min current
limit the result will be shown on the display
with big digits.
The small digits toggle between max and min
current value.
Pictures shows that the test current was below 219 A and
over 205 A.
B] If the current value is below the set min cur-
rent limit there is the fail signal and the < character is displayed to the left of the set min current
value.
Charging
6] When the lock symbol disappears the MOM2
is ready for a measurement.
Ready for test
7] Press the TEST button on MOM2 or Trigger
on the probe.
A continuous audio signal tells that the
measurement is in progress.
Two short signals tells that the measurement
is complete.
Picture shows that the test current was below 100 A.
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5 OPERATING INSTRUCTIONS
5.4 Measurement using P/F – pass/fail
1] Make the desired settings in the SET options
Select P/F and enter desired limit value.
In this example LOG is set to OFF
2] Turn the function selector to one of the test
positions.
3] Press the TEST button on MOM2 or the pull
the trigger on the probe.
A continuous audio signal tells that the
measurement is in progress.
Another signal tells that the measurement is
complete, pass or fail.
A] If the resistance value is below the P/F limit.
The result will be shown on the display with
big digits.
The small digits toggle between the P/F limit
and the max, min current values.
Here P/F limit was set to 150 µΩ and the measured resistance value is 100 μΩ.
The small digits show the set P/F value (< 90 μΩ).
The character ">" to the left of the big digits indicates that
the P/F value was exceeded.
The minimum current was 80 A and the resistance value is
102 μΩ.
Max current during test was 219 A.
Min current during test was 205 A
B] If the resistance value is over the P/F limit
there is the fail signal and the > character is displayed to the left of the set P/F value.
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5 OPERATING INSTRUCTIONS
5.5 Measurement with user
defined settings
There are three positions for storing user defined
settings. These can only be set via a PC with the
MOM2Win Software, see chapter MOM2 Win.
5.6 Measurement using the LOG function
See section 4.6 Data logger – LOG for how to set up.
Running numbers mode
The measurements are numbered in numerical order
1to1999
Measurement is automatically stored, provided that
the memory is not full (Running numbers =1999).
The display before first measurement.
The display after measurements
By using the ◀ ▶ and ▲ ▼ keys you can scroll between the saved test results.
Note You can only scroll through the measurements
in the selected LOG mode
Circuit breaker testing mode
Each label e.g. 1A1 in the memory for the circuit
breaker measurement can contain three measurements. These are indicated by commas, see picture
below.
The label is built of three elements
▪ Two-digit indication of circuit breaker (1 to 19)
A letter for phase (A,B,C)
▪
▪ Digit for interrupter (1 to 9)
142 3
5 6
1. The first measurement on the present label shown by
a comma.
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5 OPERATING INSTRUCTIONS
2. The second measurement in the present memory cell
shown by a comma.
3. The third measurement in the present memory cell
shown by a comma.
4. Digit for the circuit breaker
5. Letter for the phase
6. Digit for the interrupter
The display before measurement
The display before first measurement, one comma:
To view all measurements stored on the
same label
1] Press the ▲ ▼ keys until an arrow sign is
shown to the left.
2] Scroll between measurements 1, 2 and 3 by
using the ◀ ▶ keys.
Example: Three measurements on one label
are shown as e.g. "1A1-1", "1A1-2", "1A1-3".
Note You can only scroll through the measurements
in the selected LOG mode
The display before second measurement, two commas:
The display before third measurement; three commas.
The display after measurements
When three measurements have been done and saved
to a label e.g. 1A1 the lock sign is shown.
Note To continue to measure you need to either
delete the latest measurement or scroll to a
blank label.
By using the ◀ ▶ and ▲ ▼ keys you can toggle between the saved test results
The display shows "3" for the third measurement for the
specific label. The arrow sign to the left only represents the
omitted characters to the left of the digit "3".
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5 OPERATING INSTRUCTIONS
5.7 Measurement using P/F
and Imin
In this example LOG is set to OFF.
1] Read the section 5.1 General instructions.
2] If applicable, connect the ground cable (pro-
tective earth).
3] Make the desired settings in the SET options.
Select P/F and enter desired limit value.
Select I min (50 or 100 A).
4] Attach the test cables.
5] Turn the function selector to desired I > I min
position.
The instrument indicates that it is charging
the capacitor by a repeated sound and on
the display shows alternating "CAP" and
"CHG" as well as the padlock symbol.
display with big digits e.g. as below.
The small digits toggle between max and min
current value and the P/F limit.
The minimum test current was 80 A and resistance is
102µ.
B] If the resistance value is over the P/F limit
there is the fail signal and the > character is displayed to the left of the set P/F value.
Charging
6] When the lock symbol disappears the MOM2
is ready for a measurement.
Ready for test
7] Press the TEST button on MOM2 or pull the
trigger on the probe.
A continuous audio signal tells that the
measurement is in progress.
When the measurement is complete there
will be a pass or a fail signal.
The small digits show the set P/F value (< 90 μΩ).
The character ">" to the left of the big digits indicates that
the P/F value was exceeded.
C] If the current value is below the set min cur-
rent limit there is the fail signal and the < character is displayed to the left of the set min current
value.
The maximum test current was 82 A and the test current
was below 100 A.
D] If both the P/F limit and the current limit are
contravened, the big digits will toggle between
resistance value, < current limit and > P/F limit.
A] If the resistance value is below the P/F limit
and the current value is over the set min
current limit the result will be shown on the
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5 OPERATING INSTRUCTIONS
5.8 Testing on circuit breakers having a current transformer in the loop
If there is a current transformer (CT) in series with the
breaker contact to be tested then it is advisable to make
some basic checks.
Encapsulated or dead tank breakers are the most common
types which have a current transformer in the loop.
The technical reason is that the CT must be saturated before
it is possible to get a reliable result. To get a transformer
saturated it needs time and current or an open secondary
winding.
A CT included in the circuit may influence the DC resistance
reading. The CT need to be in saturation not to influence
the DC resistance measurement. The time required to drive
the CT in saturation depends on current level and secondary
side burden, the time is usually several seconds if secondary
side is shorted.
If possible make a visual check to be sure that there is no
current transformer in the loop. If this is not possible like in
encapsulated breakers then make the following check:
1] Make two tests, one with 0.1 second and one
with 3 seconds setting. If the values are equal
then there is no current transformer in the
loop.
5.9 Trouble shooting
Problem Solution
Headset does
not work
Impossible to
charge the
batteries with
the supplied
charger in
MOM2
Error messages
Message Cause Remedy
"O L" Bad connection
Warning sign
on display and
the battery
charge
indicator
blinks
Warning sign
on display
Check that it is paired to MOM2
Check on MOM2 that Bluetooth
is enabled
Please see information under section "Battery practice" on page
<?>.
/ resistance out
of measurement
range
The batteries
cannot charge
the capacitor
A thermal
protection has
tripped.
Check cables and
connections
Charge the batteries
Note: It might be possible
to proceed and make some
tests if it is realistic to
select a test position that
requires less power (shorter
measuring time).
Turn off the MOM2 and let it
cool down.
If you get different readings it might be a need for a
“workaround”.
1] If possible increase the current and / or test
time.
2] Increase the burden on the current trans-
former by opening the secondary winding
or connect a 5 to 10 ohm resistor across the
winding.
3] Repeat the measurement several times in
the same direction until a stable value is
achieved.
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6 APPLICATION EXAMPLES
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6 APPLICATION EXAMPLES
6
Application examples
6.1 Safety
Important regarding all testing
Read and comply with the
safety instructions.
Important
Note If you are measuring resistance in a circuit
breaker or disconnecting switch (isolator),
make sure that it is closed and grounded at
both sides before testing.
Always comply with local
safety regulations.
6.2 Measurement using Kelvin probes
An example how to perform testing using the two
Kelvin probes. This example describes the performance if you only want to know if the test object pass
a preset value and you do not need to store the test
results.
1] Select LOG function "OFF", and set P/F value
(see section 4.6 and 4.7).
2] Attach the test cables with Kelvin probes (2 x
1.3 m) one with a trigger, to MOM2.
3] Turn the function selector to desired posi-
tion.
4] Hook the instrument to your belt or use the
strap.
5] Press and hold the two Kelvin probes to the
test object and pull the trigger.
If the value is outside the limits there is a
sound telling the result was fail.
The measurement value remains until another measurement is performed or until the
instrument is switched off.
Measurement on a test object
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6 APPLICATION EXAMPLES
6.3 Test a CB using DualGround
You can perform testing with both sides grounded.
However the measurement accuracy will be somewhat lower with both sides grounded depending on
the ratio of the currents – circuit breaker / grounding
cables (see section 2.2). This example shows a test on
a HV CB using a man lift.
1] The circuit breaker shall be disconnected,
closed and grounded on both sides.
2] Attach the black (3 m) test cable with Kelvin
clamp and the Kelvin probe with trigger to
the instrument.
3] Hook the MOM2 to your belt or use the strap
to hang it around your neck.
4] Attach the black test cable with Kelvin clamp
to one side of the CB using the man lift.
5] Move yourself to the other side of the CB us-
ing the manlift.
6] Press and hold the Kelvin probe to the test
object and pull the trigger.
6.4 Test a CB by injecting through the ground cables
1] The circuit breaker (CB) shall be disconnect-
ed, closed and grounded on both sides.
2] Connect the MOM2 to ground.
3] Attach an extra ground cable (not included)
with at least 95mm2 cross section area to one
side of the CB.
4] Connect the 0.5 m current cable to the cur-
rent out minus terminal on the MOM2 and
attach the other end to ground close to
where the CB's grounding cable is attached.
(the opposite side of CB from where the extra ground cable is attached).
5] Mount the 0.1 m plate to the current out
plus terminal on the MOM2 and attach the
extra ground cable to the plate.
6] Connect the sensing cables (red and black) to
the CB.
7] Remove the original CB grounding cable on
the side where the extra grounding cable is
attached.
Measurement on CB with both sides grounded.
Note The test can also be done by using two Kelvin
clamps.
8] Press the TEST button.
Traditional measurement from ground. Injection is done
through existing grounding cable (earthing). Optional cable
kit is needed. Available kits have 5, 10 or 15 m cables.
Disconnection
1] Re-attach the original CB grounding on the
side where the extra grounding is attached.
2] Disconnect the sensing cables from the CB.
3] Disconnect the extra ground cable from the
0.1 m plate on plus terminal.
4] Disconnect the 0.5 m current cable from
ground.
5] Disconnect the ground cable from MOM2.
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7 MOM2 WIN
7
MOM2 Win
7.1 Introduction
MOM2 Win is a Windows® program that communicates with the MOM2 micro-ohmmeter instrument.
It is used for:
▪
Reading measurement data from the instrument and save
it to file
▪ Configuring the instrument
▪ Calibrating the instrument
Download software
1]
7.2 MOM2 Win installation
Preconditions
▪ Windows XP / 7 / 10
▪ Computer with built in bluetooth or using USB Bluetooth
dongle.
▪ USB Bluetooth dongle
The USB Bluetooth dongle must be installed, see the
installation instructions supplied with the dongle.
Setup
1] Insert the USB stick with the MOM2 Win sw.
Select and run the file "Setup.exe" to install
the program.
The program will be installed in the folder C:\Program
Files (x86)\Programma\MOM2 Win with program
shortcuts on the desktop.
Select language
1] Under "Settings" menu, select "Language".
All texts in all open windows will be updated
with the selected language.
Note If the translation is missing for some texts the
default language (English) will be used.
The language selection does not change the
time format or decimal separator which instead follows the Windows regional settings.
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7 MOM2 WIN
7.3 Start MOM2 Win
1] Click the MOM2 icon on the desktop or
run the file Mom2Win C:\Program Files (x86)\
Programma\MOM2 Win
The program will startup showing the start
page.
7.4 Connecting to MOM2
To establish the Bluetooth connection the MOM2
must be paired to the PC, see section 4.3.
Automatic connecting
1] Turn the function selector to the PC COM
position on the MOM2 instrument.
At program startup the SW will try to connect to
MOM2 using the same COM port that the last successful connection used. If there have been no previous MOM2 connections from this computer the SW
will scan all available COM ports. If there are several
paired MOM2 instruments nearby the SW will connect to the first one detected. The connection status is
shown on the start page, see Figure 8.3.1.
Manual connecting
1] Open the "Connection settings" window
from the "Settings" menu or double-click on
the connection status text field on the start
page.
The "Connection settings" window will then
pop up, see figure below
Figure 7.1 Start page
Exit MOM2 Win
1] Exit the program by selecting "Exit" from the
"File" menu or by clicking on the "X" button
in the upper right corner of the window.
The program will ask for a confirmation before it closes.
Figure 7.2 The Connection settings window, no connection
established.
2] Choose a COM port in the drop down list and
click the "Connect" button.
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7 MOM2 WIN
The program will try to connect to a MOM2
instrument over the specified COM port.
If it is unknown which COM port to use the program
can scan all available ports until it finds a MOM2
instrument.
3] Click the button “Scan for MOM2”.
The operation can be interrupted with the
“Cancel scan” button.
Figure 7.3 The Connection settings window, searching.
Figure 7.4 The Connection settings window, connection
established.
Refresh button
Provided that the MOM2 and the PC are connected
to each other the "MOM2 date and time" and the
"PC date and time" fields are updated every time you
open the "Connection settings" window or when you
click the "Refresh" button, see Figure 8.4.3
Synchronize clock PC -> MOM2
When you click the “Synchronize clock PC -> MOM2”
button the PC system time is written to the MOM2.
This is the easiest way to set the clock in MOM2, see
Figure 8.4.3
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7.5 Read the measurement log
1] Click the "Measurements" button on the
Start page or select "Measurements" from
the "Tools" menu.
7 MOM2 WIN
Figure 7.5 Data dumping dialog.
2] Click on the "Retrieve all data" button to
download all measurements stored in the
instrument.
A window will pop up showing the progress
of the download.
At any time the data dump can be stopped
by clicking the "Cancel" button. In that case
the data window will be closed.
Figure 7.6 Data dumping progress.
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7 MOM2 WIN
Figure 7.7 Data dumping finished. The columns can be sorted by clicking the headers and arranged by click-hold and drag.
Export data to file
1] Click the "Save to file" button (this button is
not enabled if the list is empty).
A "Save as" window will be opened.
Delete all data on the instrument
1] In the "Measurements" window, click the
"Delete all data" button to erase all the
measurements in the instrument log.
2] Type a file name and click the "Save" button
to export the data to file.
A] The default file type is (*.csv) which will save
the data as an ASCII file with comma separated values, suited for import to e.g. Microsoft
Excel.
Note The value separator is dependent of the re-
gional setting in Windows, a semicolon when
comma is used for decimal separator and
comma otherwise.
The format of the exported data is not the same as
what is seen in the measurements table. There is no
mixing of values and units, the units are placed in the
column headers.
B] If file type (*.txt) is selected the data will be
saved with the values separated by tabs.
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7 MOM2 WIN
7.6 User settings
1] Click the Program "User" positions button
on the start page or choose Program "User"
positions from the "Tools" menu .
Figure 7.8 Delete all measurements progress.
Figure 7.9 Program "User" positions
Read existing settings
1] Select "User" position No." (1 – 3).
2] Click the "Read from instrument" button to
see the current settings on the instrument.
All three user settings will be read, not only
the one selected in the combo box. The values for minimum current, pass/fail limit and
type of logging will be updated.
Program "User" positions
1] Make the desired settings and click the "Save
to instrument" button.
Note All three User positions will be updated on
the instrument, not just the currently selected
one.
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7 MOM2 WIN
7.7 Calibration
Calibration is recommended to be made regularly at a
yearly basis. Please contact your Megger sales representative or a Megger service center.
An alternative is to perform the calibration on your
own. Then you will need the equipment listed below:
▪
Stable DC voltage source, 10 mV – 2000 mV
▪ Calibrated reference voltmeter
▪ Calibration kit (BD-90002)
Procedure
1] Click the "Calibration" button on the Start
page or select "Calibration" from the "Tools"
menu to switch to the calibration page.
The existing calibration factors will be read
from the instrument and the calibration page
will be disabled until it is finished.
The voltage measured with the new calibration
factor will be shown in the "U Verified" field. The
deviation (in percent) from the reference value
will be shown to the right.
6] Repeat from step 1 for the next two ranges.
Figure 8.7.2 Voltmeter calibration
Ammeter calibration
Figure 8.7.1 Calibration page. Loading calibration factors
during startup.
Voltmeter calibration
The voltmeter should be tested in three ranges.
1] Connect the voltage source to the MOM2
sense input, correctly polarized
2] Use the calibrated voltmeter and adjust to
the stated reference voltages:
10 mV ±10%
200 mV ±10%
2000 mV ±10%
Note The voltmeter in the instrument must be
calibrated before it is possible to calibrate the
Ammeter.
The ammeter is calibrated in an indirectly manner by
measuring the resistance over two predefined shunts
and compare with the reference values. The resistance
is measured with a capacitor voltage suitable for the
voltage and current ranges.
1] Connect the current cables from the MOM2
to the reference shunt
2] Connect separate sense leads from the
MOM2 sense input to the sense outputs of
the reference shunt
3] Enter the value of the shunt in the "R refer-
ence" input field.
The "Measure" button will be enabled if the
resistance is within the limits.
4] Click the "Measure" button next to the field.
When the measurement is started a progress
window is shown, see fig. below. The two
uppermost fields show the measured capacitor voltage and the target voltage.
3] Type the value in the U reference column in
MOM2 Win
4] Click the "Measure" button next to the field.
The value measured by the MOM2 will then be
propagated to the "U measured" text field.
New calibration factors will automatically be
calculated.
5] Click the "Verify" button.
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Figure 8.7.3 Resistance measurement progress window
5] The measurement goes on and when it is finished
the "R Measured" field is filled with the measured resistance value and a new calibration factor
for this measurement range is calculated, see fig.
below.
7 MOM2 WIN
a calibration time can only be made when
the calibration is completed and saved to the
MOM2.
2] Click the "Print report"button to print the
calibration report.
Figure 8.7.4 Ammeter calibration.
6] Click the "Verify" button.
A measurement is started and the "Resistance measurement in progress" window will
be shown.
7] Repeat from step 1 for the next reference
shunt.
When the resistances over both the shunts
have been measured and the result is satisfactory you can save it to the MOM2.
8] Click the"Save to instrument" button.
9] If the result of the tests is not satisfying or
you want to start over, click the "Cancel"
button.
This will empty the calibration dialog and the
calibration factors are read from the instrument again.
Calibration report
1] Click the "Calibration Report" button to
show a preview of a calibration report.
It can be opened at any time during the
calibration. However, a complete report with
Figure 8.7.5 Calibration report.
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8 SPECIFICATIONS
8
Specifications
SPECIFICATIONS
Specifications are valid at fully charged batteries and an ambient
temperature of +25°C, (77°F). Specifications are subject to change
without notice.
Environment
Application field For use in high-voltage substations
Temperature
Operation -20ºC to +50°C (-4°F to +122°F) *
Storage -40ºC to +70ºC (-40°F to +158°F)
Relative humidity %RH 5%-95%, non condensing
Pollution degree 2
Shock IEC 600 68 -2-27
Vibration IEC 60068-2- 6
Transport ISTA 2A
Flammability class V0
*) Battery operation temperature 0ºC to +50° (32°F to +122°F)
Battery charging temperature +10ºC to +40° (50°F to +104°F)
CE-marking
EMC 2014/30/EU
LVD 2014/35/EU
RoHS 20 11/65/ EU
General
Battery power Five AA (HR6) 2700 mAh NiMH cells
Recharge time < 12 h
Typical recharge time
at 25°C
Battery charger
Mains voltage 100 - 250 V AC, 50 / 60Hz
Power consumption 24 W
Protection Against wrong battery type, low/high
Real time clock battery
life
Audible feedback Different buzzer sounds
User presets 3
Field calibration Yes
Encapsulation IP54
Dimensions
Instrument (excl.
binding posts)
Carrying case 395 x 300 x 190 mm
Weight 1.0 kg (2.2 lbs) instrument only
and industrial environments.
)
3 h
temperature.
≥10 yea r s
217 x 104 x 72 mm
8.5 x 4.1 x 2.8 in.
15.6 x 11.8 x 7.5 in.
5.0 kg (11 lbs) with accessories and
carrying case
Measurement section
Minimum current
guarantee
Pass / Fail Settable from 1 µΩ to 1999 mΩ
Number of
measurements on fully
charged batteries
Interference
suppression
Range 0 - 1000 mΩ
Range selection Auto
Resolution
0 – 999 µΩ 1 µΩ
1.0 – 9.99 mΩ 0.01 mΩ
10.0 – 99.9 mΩ 0 .1 mΩ
100 – 1000 mΩ 1 mΩ
Inaccuracy
0 – 1999 µΩ ±1 % of reading ±1 digit
2 – 500 mΩ ±2 % of reading ±1 digit
500 – 1000 mΩ ±4 % of reading ±1 digit
Outputs + / –
Range > 100 A DC (R < 2 mΩ)
Output voltage (max) 2.5 V DC
Generation duration Selectable: 0.1 s, 0.6 s, 3 s
Generation time Max Typ
0.1 s 10 s 8 s
0.6 s 20 s 16 s
3 s 130 s 100 s
Inputs
SENSE + / –
Connector 4 mm banana jack
Voltage ±3 V DC
Trigger input Threshold 8 V DC
DC IN 12 – 24 V DC, 2 A max
Logger
Logger, Data Label. Timestamp, I max, I min, I Limit,
Labeling schemes Circuit breaker oriented or running
Capacity 104 measurements
Wireless communication
PC communication Bluetooth
Selectable 50 A / 100 A
Valid at resistance ≤2mΩ
typ. 2200 at I min = 50 A and 0.1 s
typ. 800 at I min = 100 A and 0.1 s
Yes
Recovery time at I min set to 100 A
and load 100 μΩ
Resistance, Meas.time, P/F limit
numbers
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INDEX
Index
A
Application examples..................................... 32
Audio signals ................................................. 19
B
Basic technical description .............................. 9
Battery charging ............................................ 20
Battery charging indicator .............................. 11
Battery charging LED
indicator ...................................................... 20
Battery lid....................................................... 11
Battery power supply ..................................... 20
Bluetooth ....................................................... 15
Both sides grounded........................................ 9
C
Calibration ..................................................... 40
Clear log ........................................................ 11
CLK................................................................ 16
Clock.............................................................. 16
Connector for the battery charger.................. 11
Connectors for trigger .................................... 11
Current output terminal (-) ............................. 10
Current output terminal (+) ............................ 10
D
Delete all reults .............................................. 23
Delete present test result............................... 23
Delete results................................................. 23
display ........................................................... 22
Display ........................................................... 11
DualGround ..................................................... 9
F
Functions ....................................................... 14
Functions and set up ..................................... 14
Function selector ........................................... 11
H
Hold present test result.................................. 23
I
I min ............................................................... 17
Included accessories ..................................... 12
Input for sensing voltage (-) ........................... 11
Input for sensing voltage (+) .......................... 11
K
Kelvin Clamp/Probe practice ......................... 23
Kelvin test ........................................................ 9
Keys............................................................... 11
L
LCD display ................................................... 22
LOG ............................................................... 17
low temperatures ........................................... 23
M
Measurement on using Kelvin probes ........... 32
measurement time ......................................... 22
Measurement using P/F ................................ 26
Measurement using P/F and I min................. 29
Measurement using the LOG function ........... 27
Measurement with max. charge, I=I MAX ..... 24
Measurement with minimum current guarantee,
I>I MIN ........................................................ 25
Measurement with user dened settings ....... 27
MOM2 installation .......................................... 34
MOM2 Win ..................................................... 34
O
OFF ............................................................... 14
Operating instructions.................................... 22
Optional accessories ..................................... 13
overview ........................................................ 10
P
Pass/Fail ........................................................ 18
PC COM ........................................................ 19
PC communication ........................................ 19
P/F ................................................................. 18
Protective conductor terminal ........................ 10
R
Recalling test results ..................................... 23
Replacing batteries ........................................ 20
S
Safety .............................................................. 6
Safety instructions ........................................... 6
Save test results ............................................ 23
Service and support......................................... 8
set up ............................................................. 14
Specications ................................................ 42
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Stand-by / Wake up ....................................... 11
T
Test a CB by injecting through the ground ca-
bles ............................................................. 33
Test a CB using DualGround ......................... 33
TEST button .................................................. 11
Testing on circuit breakers having a current
transformer in the loop ................................ 30
Test positions ................................................. 14
To choose I > I min or I = I max ........................ 22
To choose measurement time ....................... 22
Training courses .............................................. 8
Trouble shooting ............................................ 30
U
USER – 1/2/3 .................................................. 14
INDEX
W
Wake up ........................................................ 11
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