Comparison of SKB EP milli-ohmmeters

Measurement of active resistance of windings is an important stage of maintenance, as well as part of the acceptance test program at the factory.  Transformers, electric motors, electromagnets, etc. are subject to vibration, overload and the influence of large temperature drops, which in time leads to the disruption of the connections and requires constant testing with special instruments - milli-ohmmeters.

  MIKO-9А MIKO-8M(A) MIKO-7М(А) MIKO-2.3
  Миллиомметр МИКО-9
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Application area
Windings of power transformers 1.gif 1.gif 1.gif 1.gif
windings of small size
transformers
Non-demountable estimation of transformers' OLTCs 1.gif 1.gif 2.gif 2.gif
Windings of current and voltage measuring transformers
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with winding resistance
up to 30 kΩ
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with winding resistance
up to 10 kΩ
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with winding resistance
up to 2 kΩ
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with winding resistance
up to 1 kΩ
Windings of electromagnets, electric motors and compensators
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Windings of high frequency filters 1.gif
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Compensatory, current limiting and other resistors of high-voltage circuit breakers 1.gif
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Contacts and connections of power and signal circuits 1.gif
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Cables 1.gif
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Temperature measurement of water, air, oil (non-aggressive environments)
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General characteristics  
Measurement range 1 μΩ ÷ 30 kΩ 1 μΩ ÷ 10 kΩ 1 μΩ ÷ 2 kΩ 100 μΩ ÷ 1 kΩ
in milli-ohmmeter mode

0,1 μΩ ÷ 0,1 Ω
in micro-ohmmeter mode
Test current range 0,0005 ÷ 10А
0,001 ÷ 10А
0,01 ÷ 10А
0,5 ÷ 5А
in milli-ohmmeter mode

10 ÷  1000А
in micro-ohmmeter mode
Accuracy ±(0,1%+0,5 μΩ) ±(0,1%+0,5 μΩ)
±(0,1%+0,5 μΩ)
±0,2%
Resolution capability 0,1 μΩ 0,1 μΩ
0,1 μΩ
0,1 μΩ
The instrument has protection against:
  • EMF of self-induction;
  • excess of test current;
  • overheat of the test block.
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Built-in memory up to 1,000 measurements up to 1,000 measurements up to 200 measurements up to 100 measurements
Display color graphic TFT touch, 800 x 480 pixels color graphic TFT touch, 800 x 480 pixels
monochrome graphic display, 128 x 64 pix monochrome, alphanumeric, 6 х 2,5 сm
PC connection By cloud server on PC and through mobile app By cloud server on PC and through mobile app
By cloud server on PC and through mobile app
RS-232 and USB
(when using adapter)
Instrument control from mobile app (smartphone)
Bluetooth

Bluetooth

Bluetooth
Power supply by built-in battery
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Li-ion battery
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Li-ion battery
MIKO-8MA
modification

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Li-ion battery
MIKO-7MA
modification

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Condenser battery
is in development. Power supply by an external li-ion battery
Mains power supply 1.gif
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Operating temperature range, ºC -20 ÷ +55 °С -20 ÷ +55 °С -20 ÷ +55 °С -20 ÷ +40 °С
Dimensions, mm 270х250х130 270х250х130 270х250х130 150х190х75
Instrument weight with battery, kg 4,0 4,0
MIKO-8MA
modification
4,0
MIKO-7MA
modification
-
Instrument weight without battery, kg - 2,7 2,7 2,7
Functions
High precision measurement modes for different objects, taking into account their specific features 1.gif
10 objects
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10 objects
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5 objects
Automatic or manual measuring current setting 1.gif
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High precision measurement modes in non-inductive circuits 1.gif
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Connection directly to the three phases of the transformer and measurement with automatic switching 1.gif
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Simultaneous resistance measurements across 2 windings, in particular for high-power transformers with secondary windings delta connected when the use of traditional methods does not give a stable result 1.gif
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Automatic load inductance meter.
The instrument automatically detects the moment of setting the resistance and stops the measurement
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Automatic inductance discharge after measurement
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Electric resistance measurement mode of power transformer windings with OLTC device. When switching OLTC devices, the instrument can stay connected
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Winding electrical resistance measurement mode during the cooling test. The test procedure is in accordance with paragraph 2. GOST 3484.2-88 "Power tramsformers. Heating Tests" 1.gif
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AUTO demagnetization mode of the magnetic transformers system 1.gif
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Non-demountable estimation of the OLTCs (DRM test) with generating oscillograms
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Automatic recalculations
Automatic calculation of the relative deviations of the electrical resistance at the three-phase windings between each other 1.gif
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Automatic recalculation of linear electrical resistance of windings delta or star connected into electrical resistance of phase windings 1.gif
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Automatic recalculation of the electrical resistance of the winding measured at the current temperature into electrical resistance at the passport temperature 1.gif
taking into account
the winding material

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taking into account
the winding material

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taking into account
the winding material
Automatic calculation of deviations of the measured and passport temperature electrical resistance of the windings compared to the passport resistance values 1.gif
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Automatic calculation of the winding temperature according to its measured and passport value of electrical resistance and passport temperature 1.gif
in the cooling test (heat run test) mode
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