Megger MJOLNER 200 User manual

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User’s Manual
MJÖLNER 200/600
Micro-ohmmeter
Art No. ZP-BD02E Doc. BD0161OE V09a 2019

MJÖLNER 200/600
Micro-ohmmeter
NOTICE OF COPYRIGHT & PROPRIETARY RIGHTS
© 2013-2019, 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.
User’s Manual
Postal address:
Megger Sweden AB
Box 724
SE-182 17 DANDERYD
SWEDEN
T [phone]
E [e-mail] www.megger.com
Visiting address:
Megger Sweden AB
Rinkebyvägen 19
SE-182 36 DANDERYD
SWEDEN
BD0161OE ZP-BD02E MJÖLNER 200/600 3

4MJÖLNER 200/600 ZP-BD02E BD0161OE
Contents
1 Safety
............................................................. 6
Symbols on the instrument.......................................... 6
Safety instructions....................................................... 6
2 Introduction
............................................................. 8
3 Control panel
........................................................... 10
4 Menu options
........................................................... 12
4.1 Main menu................................................12
Legend...................................................................... 12
4.2 Setup menu...............................................12
4.3 Result window ..........................................13
Memory.................................................................... 13
5 Operating instructions
........................................................... 14
5.1 General application....................................14
USB memory stick (optional)...................................... 14
Remote control (optional).......................................... 14
XLR Bluetooth dongle (optional)................................ 14
Temperature probe (optional) .................................... 15
5.2 Safety functions.........................................15
High temperature...................................................... 15
5.3 Printer........................................................16
Replacing printer paper............................................. 16
5.4 Run with MJÖLNER Win.............................16
Installing MJÖLNER Win ............................................ 16
Unlock the MJÖLNER ................................................ 16
5.5 Remote operation......................................17
Using the Remote control.......................................... 17
Using the XLR Bluetooth dongle................................ 17
5.6 Verify the measuring current ......................18
Shunt output ............................................................ 18
Verify the measuring function ................................... 18
5.7 Calibration and Service menu.....................19
Calibration................................................................ 19
5.8 Troubleshooting.........................................20
5.9 Optional accessories...................................20
MJÖLNER Win........................................................... 20
Remote control ......................................................... 21
XLR Bluetooth dongle .............................................. 21
Temperature probe.................................................... 21
Extension cables........................................................ 21
Calibration shunts..................................................... 21
DualGround kit ......................................................... 22
6 Application examples
........................................................... 24
6.1 Test a circuit breaker – both sides
grounded ................................................24
6.2 Measuring resistance at bus-bar joints........25
Measuring using the remote control.......................... 25
Measuring using an external voltmeter...................... 25
7 Specifications
........................................................... 28
MJÖLNER 200/600...........................................28
Index ....................................................... 30

BD0161OE ZP-BD02E MJÖLNER 200/600 5

6MJÖLNER 200/600 ZP-BD02E BD0161OE
1 SAFETY
1Safety
Symbols on the instrument
Caution, refer to accompanying docu-
ments.
Caution, risk of electric shock.
Protective conductor terminal.
WEEE, Waste Electrical and Electronic
Equipment. Please utilize your local
WEEE collection facilities in the dispo-
sition of this product and otherwise
observe all applicable requirements.
The unit can also be returned to
Megger at any timeat at no charge for
the disposal.
Information duty regarding substances
on REACH article 33, SVHC-list
This product contains a coin cell battery which con-
tains 1,2- dimethoxyethane (CAS 110-71-4) above
0.1% by weight.
Safety instructions
Important
Read and comply with the safety instruc-
tions.
Always comply with local safety regula-
tions.
Warning
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. This can cause high voltages when re-
moving the current clamps.
3.
After completing your measurements, you can
follow the normal procedures that are used to
demagnetize current transformer cores after DC
has passed through a current transformer.
4.
Never open a circuit breaker while MJÖLNER is
connected to it.
5.
Connection points for current cables can be-
come hot during current generation.
6.
Current continues to flow for a while after the
MJÖLNER is turned off. How long it continues
depends on the ratio of the components in the
L/R circuit.
7.
High voltage/current on input/output terminals.
8.
Do not attempt to service the instrument your-
self. Opening or removing covers may expose
you to dangerous voltage. If you attempt to
service the instrument yourself the warranty is
no longer valid.
9.
Do not use any accessories that are not intend-
ed for use together with the instrument.
10.
Disconnect the instrument from the mains be-
fore cleaning. Use a damp cloth for cleaning. Do
not use liquid cleaners or aerosol cleaners.
Important
1.
The instrument is intended for use in an in-
dustrial environment. It generates, uses and
can radiate radio frequency energy and, if not
installed and used in accordance with these
instructions, 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.
▪Connect the equipment into an outlet on a circuit
different from that to which the other device(s) is
connected.
▪Consult the manufacturer or field service technician
for help.

BD0161OE ZP-BD02E MJÖLNER 200/600 7
1 SAFETY
2.
Always turn the equipment off before connect-
ing.
3.
The MJÖLNER is equipped with a mains plug
having a third (earthing, grounding) pin. This
plug will only fit into an earthing/grounding
type power outlet.
The outlet used should be tested regularly for
proper impedance of the protective earth wire.
4.
Always use manufacturer approved and sup-
plied cable sets.
5.
Always connect protective earth (ground).
Use the grounding cable connected to the
Grounding Terminal page described in chapter
"3 Control panel" on page 10
6.
Never leave the instrument unattended while it
is turned on.
7.
Use only approved mains detachable cable set
with the instrument. Main supply cables shall be
rated for the maximum current for the equip-
ment and the cable shall meet the requirements
of IEC 60227 or IEC 60245. Mains supply cables
certified or approved by a recognized testing
authority are regarded as meeting this require-
ment.
8.
Unplug the instrument from the mains supply
when it is left unattended or not in use.
9.
Do not expose the instrument to rain or mois-
ture.
10.
Refer all servicing to Megger authorized person-
nel.
11.
If you need to return the instrument, please use
either the original crate or one of equivalent
strength.

8MJÖLNER 200/600 ZP-BD02E BD0161OE
2 INTRODUCTION
2Introduction
The MJÖLNER 200 and 600 are 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 MJÖLNER micro-ohmmeters 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.

BD0161OE ZP-BD02E MJÖLNER 200/600 9
2 INTRODUCTION

10 MJÖLNER 200/600 ZP-BD02E BD0161OE
3 CONTROL PANEL
3
Control panel
1 Grounding terminal
2 Connection for mains voltage
3 Switch for mains voltage
4 TEMP. SENSOR
This interface is for connection of a tempera-
ture probe for temperature compensating.
5 INTERFACE
For communication with PC and MJÖLNER Win.
6 DATALOGGER
Port to connect a USB stick for datalogging
(in .csv format) during a test. Results can be
viewed with Excel.
7 REMOTE
For connection of optional accessories like the
Remote control or the XLR Bluetooth dongle.
8 Printer
9 Keys to control the menu functions
10 Start/Stop key with status LED
11 Adjustment keys to set the measuring current
and all menu values
12 DC- current output
13 Sensing terminals
14 DC+ current output
15 Shunt output
16 Clamp sense input
12
14
13
The location of the current outputs on MJÖLNER 600.
6
9
4
1
16
8
5
7
2
15
14
13
12
10 11
3