Phenix Technologies MRM-100-V2 User manual

MRM-100-V2
Digital micro-ohmmeter
User’s guide
GF-XXXX
© 2020 PHENIX TECHNOLOGIES. All rights reserved.
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
Safety Precautions
efore to use this instrument the User Guide and Safety warnings must be
read and understood.
Safety 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.
efore you begin the measurement verify the mains supply voltage
compatibility.
The micro-ohmmeter must be connected to earth point, through the green
terminal or the power cord (both use the same point).
During 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.
Certified 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 find in disconnected points high
potential levels in relation to the earth point. Those potentials are caused by
present electromagnetic fields and can be minimized following the indications
in the paragraph before.
Make sure that the current connections are well connected as well as the
C-clamp, to avoid undesirable heating.
e careful when manipulating the current terminals in the instrument. You
may get high temperatures in the current connections.
Never 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.
The equipment must be kept dry and clean.
Never use the equipment if you suspect regarding its functionality. The
equipment must to be put out of service (contact your distributor service
department).
This equip ent should be used only by a trained and co petent
person, strictly applying suitable safety rules.
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Used sy bols
Caution, refer to User Guide.
Printer.
US (Universal Serial us).
30 V max. (to ground): indicates the maximum potential allowed
in the terminals during resistance measurements.
Warning, hot surface. e careful when handling.
Equipment complies with current EU Directives.
Double insulation: symbol indicates that the equipment is
classified 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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Index
1. Description.............................................................................................................7
1.1. Operating principle..........................................................................................8
1.2.  Use of test probes......................................................................................8
2. Control panel..........................................................................................................9
4. Settings and Adjustments....................................................................................12
5. Measurement.......................................................................................................14
5.1. Manual mode................................................................................................17
5.2. Auto mode.....................................................................................................17
5.3. oth Side Ground ( SG)..............................................................................18
7. Printer...................................................................................................................19
8. Internal memory...................................................................................................19
9. Software...............................................................................................................20
9.1. PXLogger Software.......................................................................................20
10. Remote control...................................................................................................21
11.  Replacement fuse........................................................................................22
12. Cleaning.............................................................................................................22
13. Technical specifications.....................................................................................23
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1. Description
The MRM-100-V2 high-current micro-ohmmeter is a portable, digital
instrument. It has optimized filters 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., with test currents up to 100A. It employs the 4 terminals-
method (U/I measuring principle) to avoid errors caused by test leads and
their contact resistances.
Measurement accuracy is guaranteed by a state-of-the-arts signal
amplification system, offset-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 300 mΩ, and
the best resolution is 0.1 µΩ.
It has an internal memory for up to 4000 measurements divided into
multiple records. The data output (US ) may be connected to a computer
to download the stored values.
This equipment incorporates an open Mod us protocol and can be
controlled remotely through an Android application or via US by
customized software, labview and PLC
The high-current generation system is based on modern technology that
allows to significantly decrease both its weight (approx. 11kg) and size.
The cabinet is made of plastic material highly resistant to impacts and to
environmental challenges. Internal thermal sensors in all sensitive
components avoid any damage caused to the instrument due to
overheating.
This is 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) offering an excellent performance
working both in the laboratory and out in the field.
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1.1. Operating principle
This device uses the Kelvin ridge 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.
1.2.  Use of test probes
WARNING
Only use the test leads supplied with the equip ent, for
easure ent and calibration procedure.
Make sure that the current connections are well connected as
well as the C-clamps, to avoid undesirable heating.
Attention when manipulating the current terminals of the
instrument. You may get high temperatures in the current
connections.
Make sure that the cables are straight during the measurement
to avoid overheating.
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2. Control panel
 Display.
 Current terminal (C+).
 Potential terminal (P+).
 Potential terminal (P-).
 Current terminal (C-).
 Ground.
 Auxiliary current clamp connector.
 Fuse.
 Power cord connector.
 Printer.
Keyboard.
 US connector.
 Test current control.
 On/Off switch.
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3. 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.
NUMBER ONE
MODE:NORMAL 01:15
I= 55A
02/01/20 16:18
Object test name
Mode selected
Date Time
Timer
Selected current
Built-in chrono eter
It features the elapsed time (in minutes and seconds) since test current is
applied.
Real ti e clock
It has a real time clock with date, hours and minutes indication, to make
identification of tests recorded in paper or in memory easier.
Test nu ber
Tests are automatically numbered by the equipment to make their
identification easier. The test number is printed at the beginning of each
test and it is stored in memory.
Model and serial nu ber
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 Certificate.
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3.1. Display essages
PHENIX
MRM-100-V2
MICRO-OHMMETER
v.2.0.0
When turning the equipment on using the
On/Off switch, this introduction message
appears for a while.
The equipment is carrying out some
functional verifications.
NO NAME
MODE:NORMAL 01:15
I= 55A
02/01/20 16:18
Main screen where a test can be started,
or set a new one.
LOW CURRENT
I=0.0A
01:15
Indicates that the test current is not
enough to carry out the reading.
OVERRAN E
I=0.0A
01:15
Indicates that the measured resistance is
higher than the maximum value readable.
OVERHEATIN
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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4. Settings and Adjust ents
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 /
confirm settings.
Change selection / values
Cancel
Cancel and close the MENU
ATTENTION: The configuration MENU can not be accessed during the tests.
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