Phenix MRM-200-V2 User manual

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200 A digital micro-ohmmeter
User guide
Parts of this manual may differ from your equipment, depending on
your country, hardware and / or firmware version and are subject to
change without notice.
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Safety warnings
zBefore to use this instrument the User Guide and Safety warnings must be read
and understood
zSafety procedures and rules for working near high voltage energized systems
must be observed during the use of this equipment. The generated voltages and
currents may be dangerous
zBefore you begin the measurement verify the mains supply voltage compatibility
zThe micro-ohmmeter must be connected to earth point, through the green terminal
or the power cord (both use the same point)
zDuring a circuit breaker measurement its contacts must be closed and connected
to an earth point. The end connected to an earth point must be connected to the
“C-” terminal
zCertied the measurement points in which will be connected all the terminals are
free of any voltage in relation to earth point and between each other. Take in account
that in a substation you will nd in disconnected points high potential levels in
relation to the earth point. Those potentials are caused by present electromagnetic
elds and can be minimized following the indications in the paragraph before
zMake sure that the current connections are well connected as well as the C-clamp,
to avoid undesirable heating
zBe careful when manipulating the current terminals in the instrument. You may get
high temperatures in the current connections
zNever connect or disconnect the cables during a measurement. If you must modify
any connection, it must be made after you have pressed the Stop button
zThe equipment must be kept dry and clean
zNever use the equipment if you suspect regarding its functionality. The equipment
must to be put out of service (contact your distributor service department)
This equipment should be used only by a trained and competent person, strictly
applying suitable safety rules.

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Used symbols
Caution, refer to User Guide.
USB (Universal Serial Bus).
30 V max. (to ground): indicates the maximum potential allowed
in the terminals during resistance measurements.
Warning, hot surface. Be careful when handling.
Equipment complies with current EU Directives.
Double insulation: symbol indicates that the equipment is
classied as Class II (double isolated).
The rubbish bin 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.

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Content
Safety warnings....................................................................................................... 2
Used symbols.......................................................................................................... 3
Description............................................................................................................... 5
Operating principle .................................................................................................. 6
Use of test probes ...................................................................................... 6
Control panel....................................................................................................... 7
Display..................................................................................................................... 8
Built-in chronometer............................................................................................ 8
Real time clock.................................................................................................... 8
Test number ........................................................................................................ 8
Model and serial number .................................................................................... 8
Display messages............................................................................................... 9
Settings and adjustments ...................................................................................... 10
Operating the equipment....................................................................................... 12
Manual mode .................................................................................................... 15
Auto mode......................................................................................................... 16
Both Side Ground (BSG)....................................................................................... 17
Protections............................................................................................................. 18
Cooling system...................................................................................................... 19
Internal memory..................................................................................................... 20
Desktop software................................................................................................... 21
USB drivers ........................................................................................................... 21
Android software.................................................................................................... 22
Minimum requirements ..................................................................................... 22
Pairing............................................................................................................... 22
Maintenance.......................................................................................................... 23
Cleaning............................................................................................................ 23
Fuse replacement .................................................................................. 24
Technical specications ........................................................................................ 25

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Description
The MRM-200-V2 micro-ohmmeter is a portable, digital instrument. It has optimized
lters and protections for measurements in electrical substations. Can be used to
accurately measure very low contact resistances of high voltage circuit-breakers and
switches, busbars, etc. It employs the 4 terminals-method (U/I measuring principle) to
avoid errors caused by test leads and their contact resistances.
The MRM-200-V2 has a cooling system that allows making a large number of
consecutive tests without activation of thermal protection. Under normal ambient
conditions (25 ºC) it can perform up to 30 consecutive tests with duration of 1 minute
and 1 minute interval, time usually spent for repositioning the cables in another test
point.
The BSG (Both Side Grounded) test mode provides to the user and to the equipment
a safer way to test objects in a substation since the both sides of a switch, contact or
circuit breaker is maintained connected to the ground during the whole test.
Measurement accuracy is guaranteed by a state-of-the-arts signal amplication
system, o󰀨set-free and of high long-term stability. Resistances readings are shown
in the alphanumeric display with up to 4½ digits-resolution. It allows to measure
resistances up to 1 Ω, and the best resolution is 0.1 µΩ.
This equipment incorporates the open protocol Modbus and can be remote controlled
through an Android app or through USB by customized software, labview and PLC.
The high-current generation system is based on modern technology that allows to
signicantly decrease both its weight (approx. 11 kg) and size. Internal thermal
sensors in all sensitive components avoid any damage caused to the instrument due
to overheating.
This is a strong but lightweight equipment and may be easily carried by one person. It
is water-resistant and can be used under severe weather conditions (IP54 with closed
lid) o󰀨ering an excellent performance working both in the laboratory and out in the eld.

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Operating principle
This device uses the Kelvin Bridge architecture, with four terminals, avoiding testing
leads resistance to cause error during measurement. The operator may choose test
current and the reading is obtained by comparison through internal high-stability
standards. The result appears in the alphanumeric display that is very easy to read.
Use of test probes
WARNING
Only use the test leads supplied with the equipment, for measurement and
calibration procedure.
zMake sure that the current connections are well connected as well as the C-clamps,
to avoid undesirable heating
zAttention when manipulating the current terminals of the instrument. You may get
high temperatures in the current connections
zMake sure that the cables are straight during the measurement to avoid overheating

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Control panel
1
Air exit
2
Display
3
Current terminal (C+)
4
Potential terminal (P+)
5
Potential terminal (P-)
6
Current terminal (C-)
7
Ground
8
Auxiliary current clamp connector
9
Fuse
10
Power cord connector
11
Cooling system
12
Keyboard
13
USB connector
14
Test current control
15
On/Off switch

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Display
Alphanumeric LCD display where the measurement result, the corresponding
measuring unit, the elapsed time since the measurement started and messages to the
operator are displayed.
Built-in chronometer
It features the elapsed time (in minutes and seconds) since test current is applied.
Real time clock
It has a real time clock with date, hours and minutes indication, to make identication
of tests recorded in paper or in memory easier.
Test number
Tests are automatically numbered by the equipment to make their identication easier.
The test number is stored in memory.
Model and serial number
At the beginning of each test, the equipment model, as well its serial number, are
registered, making it possible to relate the obtained results with their respective
equipment Calibration Certicate.

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Display messages
The equipment is carrying out some
functional verications.
Main screen where a test can be started,
or set a new one.
Indicates that the test current is not
enough to carry out the reading.
Indicates that the measured resistance is
higher than the maximum value readable.
Indicates that some part of the equipment
has achieved the critical temperature.
Thus the system will cut the high current
generation.

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Settings and adjustments
This equipment has a MENU for settings and adjustments. To
access the MENU, press the Selector / Adjust ( ), or press
button.
All navigation is performed through the and all panel keys are disabled, with the
exception of the key that has the function to cancel and return to the initial screen.
Open MENU
Short press: Open MENU, open selected sub-menu / conrm
settings
Change selection / values
Cancel
Cancel and close the MENU
ATTENTION: The conguration MENU can not be accessed during the tests.