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.

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MENU SUB-MENU DESCRIPTION
SETUP TEST
EDIT OBJECT NAME Allows write the name of the object under test, using the
alphanumeric keyboard.
TEST MODE Allows to select the test mode: MANUAL or AUTOMATIC.
TEST CURRENT Allows to select the test current for Automatic Mode.
TEST DURATION Allows to setup the test duration between Unlimited (with-
out test duration setting) and Limited (minimum of 15 sec-
onds and maximum of 2 minutes).
BOTH SIDE GROUNDED Turn on and off the BSG test.
LANGUAGE Allows you to change the interface language.
MEMORY USAGE Displays the percentage of internal memory used.
DELETE Deletes all records from memory.
SETTINGS
DATE FORMAT Selects the date format.
TIME FORMAT Selects the time format.
SET DATE Sets the date.
SET TIME Sets the time.
AUTO SAVE Save the last measured value in the internal memory when
the test is finished.
DISPLAY Display settings.
SYSTEM INFO Shows the firmware version and serial number.

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Operating the equipment
zThe User guide and its respective safety precautions must be read and understood
before using the micro-ohmmeter
zThe usual safety precautions and safety regulations must be strictly observed
zIt should be checked that the item to be measured is voltage free
zTo ensure safety, use only the accessories supplied by the manufacturer
1. Before turning the equipment On, connect the test leads to the item to be measured
and to the front panel terminals.
Simple measurement

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Measurement with potential risk
Ex .: High voltage circuit breaker under external inuence of electromagnetic elds
from nearby energized devices.
The safety ground terminal must be connected before making the other
connections to the equipment.

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2. Turn on the device with the On / O󰀨 key ( ).
3. The display of the equipment will show the presentation message MRM-200-V2.
4. The AUTO CHECK message will appear next and then the main screen.
5. Access the device’s MENU using the or key.
6. Select SETUP TEST.
7. To change the object’s name, select EDIT OBJECT NAME and write using the
equipment keyboard (press to conrm).
8. Select TEST MODE to chose between MANUAL or AUTO (explained below).
9. When the current value is equal to or greater than 5 A, the display will indicate the
measured resistance.
10. Upon completion of this process the display will indicate the measured resistance
value, the elapsed time, the test current and, on BSG mode, the ground current.
Display on AUTO or MANUAL mode
Display on BSG mode

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11. The unit of measured resistance shall be expressed in Ω (ohms), mΩ (mili-ohms)
or μΩ (micro-ohms).
12. This information can be saved in the internal memory during and / or after the test
simply by pressing the key.
13. To nish the test, press the red key. Do not turn o󰀨 the equipment with the
power switch ( ) without pressing the button.
14. Finally, after all measurements have been completed, switch the device o󰀨 using
the on / o󰀨 switch .
CAUTION: Never connect or disconnect the test leads with the equipment performing
tests. If you have to make any changes to the connection, it must be done with the
equipment in stand-by (not generating current) or turned o󰀨.
Manual mode
In manual mode, the operator selects and adjusts the current value during the test,
using the .
1. Access the device’s MENU pressing the or button.
2. Select SETUP TEST and press to conrm.
3. Select TEST MODE and press to conrm.
4. Select MANUAL and press to conrm.
5. Exit the menu and start the test.
6. During the test, adjust the current using .

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Auto mode
In auto mode, the operator preselects the current value before the test (the preselected
value cannot be changed during the test).
1. Access the device’s MENU pressing the or button.
2. Select SETUP TEST and press to conrm.
3. Select TEST MODE and press to conrm.
4. Select AUTO and press to conrm.
5. Choose the test current value using or the keyboard.
6. Exit the menu and start the test.

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Both Side Ground (BSG)
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.
ATTENTION: To perform this procedure, place the auxiliary current clamp on the
ground of the test object before turning on the equipment
1. Access the device’s MENU pressing the or button.
2. Select SETUP TEST and press to conrm.
3. Select BOTH SIDE GROUNDED and press to conrm.
4. Select the ON option and press to conrm.
5. Exit the menu and start the test.

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Protections
The MRM-200-V2 continuous using time is limited by thermal considerations.
Some internal sensors measures the temperature of the sensitive parts and trigger
the protection that will stop the current generation if any of them exceeds the limit
temperature, thus avoiding any damage. The OVERHEATING message will appear
in the display.
Under these conditions, measurements will be inhibited up to the temperature
decreases su󰀩ciently.

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Cooling system
The MRM-200-V2 has a cooling system that allows it to perform a large number of
consecutive tests without activating the thermal protection. Under normal environmental
conditions you can perform up to 30 consecutive tests with duration of 1 minute and 1
minute interval. This interval is usually used for repositioning the test lead in another
test point.
The cooling system lter must be replaced periodically. Changing the lter can be
easily performed. Pull the grid up, replace the lter and place the grid again in the
panel.
The lack of lter maintenance can decrease the cooling e󰀩ciency and thus the amount
of consecutive tests. You should use only lters supplied by PHENIX.

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Internal memory
The internal memory can store up to 4000 readings, organized by records. Each record
works like a folder where all readings saved will be stored in until the operator creates
another folder (record). During a measurement, when you want to save a measured
value, press the key.