Milliohmmeter MIKO-8M(A) new version

Certificates

  • Safety Test Certificate IEC 61010-1:2001
  • Conformity certificate with safety requirements EC/EU
  • Russian State Register Certificates
  • Declaration of Conformity of the Customs Union

Resistance measurement in inductive and non-inductive circuits in the range of 1 μOhm ÷ 10 kOhm

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Special measurement modes

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Automatic mearsurement of 3-phase transformers

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Various auto calculations and non-volatile memory

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Non-demountable estimation of the OLTC‘s (DRM test)

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High level of protection and safety conformity

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Touch screen, remote control and bluetooth data transfer

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Variable instrument configuration

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Two modifications of the instrument with different types of power

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The MIKO-8M(A) milliometer is developed to measure DC resistance in the range from 1 µOhm ÷ 10 kOhm for the current of up to 10А for:

  • Windings of power and measurement transformers, windings of electric motors, generators, linear compensators and windings of other high-inductance equipment;

  • Contacts of circuit breakers, resistors, buses and other inductance-free circuits;

  • Equalizing, current limiting and other resistors of high-voltage circuit bre­akers;

  • Сables. 

The device provides a fully automated process of measuring the resistance of a high inductive load and compensation of thermoelectric power in the external circuit.

MIKO-8M (A) implements specialized measurement modes for various configurations of 10 objects (resistive object, inductive, voltage transformer, current transformer and power transformer, generator, motor, compensator, connection filter and magnet), taking into account their specific features, while The user can select a typical object from the proposed list or create his own object. 

The instrument automatically takes into account the configuration of the object for adjusting the measuring modes.

Depending on the object type, you can sel­ect special measurement modes. For example, for a resistive object: 

  • AUTO: the measurement starts automa­tically by the circuit closed.
  • SINGLE: the measurement starts upon the User's comman (by pressing the START button).
  • PERIOD: the measurement starts automatically in pre-specified time intervals.
For an inductive object, the User can also select one of two modes: 

  • MANUAL: start and stop of the measurement are conducted manually by pressing the START button.
  • AUTO 1Ph: the measurement is initiated by pressing the START button and stopped automatically if criterium specified is reached. 

AUTO 1Ph mode has SKB EP patented automatic measurement method that guarantees results with the highest accuracy.

It is achieved by setting the max current in the measure- ment circuit not on a staggered basis (depending on the value of the measured resistance), but continuously w/o fixed measurement ranges in a wide load range.

This measurement mode provides high signal level in a complex electromagnetic environment of industrial production or substation. Moreover, in AUTO modes of the measurement process the instrument produces the highest current that enables guaranteed saturation of the transformer magnetic system.

MIKO-8M (A) has a built-in archive of up to 200 measurements for viewing, copying or deleting data. And thanks to the possibility of choosing an object at the measurement stage, the results are presented more systematically. This facilitates interaction with the archive.

The group of MIKO-7M(A), MIKO-8M(A) and MIKO-9(A) instruments has a number of automatic calculation functions:

  • Auto δ calculation of Rphase between one another. 
  • Auto conversion of Rlinear to Rphase. Linear windings are Delta or Star / Wye (with no neutral) connected.
  • Auto correction of R measured at to R at p.
  • Auto δ calculation between Rcorrected and Rp.
  • Auto calculation of by its R.  

OLTC in-place check mode allows the User to assess the state of the switching OLTC equipment with current limiting resistors without removing contactor tank cover.

This mode involves measuring of instantaneous current drops. Test current firstly passes through the transformer winding and then through OLTC contacts at changing from one tap to another. The DRM graph is built on the basis of the measurement results and shows current change during tap changing. This graph enables to check tap changing time and general object state.

Analysis of the acquired graphs enables not only to sort out OLTC by fault-free/faulty criteria, but also to define the nature of the defect eliminating opening of fault-free OLTCs. Milliohmmeter mode and DRM test complement each other and provide the User comprehensive informa- tion about the transformer state.

MIKO-8М(A) has the safety certificate IEC 61010-1. The instrument also meets the requirements of electromagnetic compatibility that are applied to class A instruments according to IEC 61326-1. 

The instrument has a high degree of protection against:

  • test cable or mains cable breakdown;
  • excess of measuring current;
  • emf of self-induction;
  • overheat of the test block..
At disconnection of the measuring cable from transformer bushings or from the instrument as well as at disconnection of the mains cable from the mains in the course of measurement, emf of self-induction of up to several kV is generated in the disconnected circuit and the electric arc appears in the break point.
 
MIKO-8М(A) is characterized by the redundant protection against emf of self-induction in case of involuntary disconnection of the measuring cable or power cable protecting users from electric shock and the instrument from being damaged.


MIKO-8M (A) is equipped with a color graphic touch screen display of high brightness and an intuitive interface, which facilitates interaction with the device.

Management can be carried out through the keyboard, touch screen or from a special mobile application that allows you to maintain and synchronize the enterprise measurement database from the instrument, and also makes it possible to control the device remotely.

None of the measuring cables is included in the standard equipment of the MIKO-8M(A) device.This allows the customer to choose exactly that kit.

To select the User and the convenience of connecting to the object, measuring cables of different lengths and different types of clamps / fasteners are specially designed:

  • Current cable 1 x 8.5 m with crocodile clips (jaw up to 80 mm);
  • Current cable 1 x 8.5 m with a G-clamp (jaw up to 103 mm) for connection to transformer;
  • Current cable 1 x 4 m with crocodile clips (jaw up to 25 mm) for resistance measurement of CT and VT windings;
  • Current cable 1 x 3 m. Weight 0.5 kg. With 2 crocodile clips (jaw up to 25 mm) and 2 removable probes (length: 70 mm, plug: 3 mm) for transient resistance measurement of CT and VT contact joints and windings.


For customer’s choice the MIKO-8M milliohmmeter has two modifications: with an in-built battery (MIKO-8MA) and without an in-built battery (MIKO-8M). The device can also be powered from the mains (≃ 110÷220, 330V).

Specifications Value
Resistance range 1 μΩ ÷ 10 kΩ
Resolution capability 0,1 μΩ
Maximum permissible intrinsic error of resistance measurement ±(0,1%+0,5 μΩ)
Best resolution 0.1 µOhm
Measuring current intensity, А 0,001 ÷ 10
Relative drift of measuring current intensity, %/s ±0.002
Amperage measurement range in the DRM mode, A 0.1 ÷ 10
The number of digits on the output of the measurement result 5
MIKO-8MA: Power (built-in battery) Li-ion battery
MIKO-8MA: Battery charge time, hour 3
MIKO-8MA: Duration of continuous operation of the battery, hours 8
Built-in memory up to 1000 measurements
Type of data transmission channel USB, RS-485 and Bluetooth
Display Color graphic TFT touch, 800 x 480 pixels
Maximum consumed power, W 120
Maximum output capacity, W 60
Power (mains voltage) ~ 90-253 V, 47-63 Hz = 127-354 V
Dimensions, mm 270х250х130
Maximum measuring unit weight with battery, kg (MIKO-8MA) 4.0
Maximum measuring unit weight without the battery, kg (MIKO-8M) 2.7
Operating temperature range, ºС -20 ÷ +55
IP rating in operating state IP40
IP for transportation IP67
Interface and user's manual language English
Testing period, year 3
Calibration period, year 3
Warranty period, year 3

Standard complete set

Photo Item, Index Application
MIKO-8M or MIKO-8MA<br>measuring unit
  • MIKO-8M or MIKO-8MA
    measuring unit
  • SKB049.00.00.000
    or SKB049.00.00.000-01
  • MIKO-8M or MIKO-8MA
    measuring unit
  • SKB049.00.00.000
    or SKB049.00.00.000-01

Instrument and covering documents: Calibration Certificate, User's Manual, and a Log Book.

Measuring cables <br><b>on order</b>
  • Measuring cables
    on order
  • Measuring cables
    on order

As a matter of convenience for the user, measuring cables are not included in the standard complete set. Each user can select a cable to his/her own requirements. Select at least one measuring cable (see "additional complete set on order" below).

Mains cable
  • Mains cable
  • SKB018.09.00.000
  • Mains cable
  • SKB018.09.00.000

Mains cable 1 x 2 m. Weight 0.24 kg.
For connecting the instrument to the power line. Temperature range -25°С ÷ +120°С. Rubber insulation.

Ground cable
  • Ground cable
  • SKB010.01.00.000
  • Ground cable
  • SKB010.01.00.000

Ground cable 1 x 2.23 m. Weight 0.07 kg.
For instrument grounding. Equipped with a ground clamp and screw end cap. Rated current – 50А.

Zero resistance equivalent
  • Zero resistance equivalent
  • SKB023.15.00.000
  • Zero resistance equivalent
  • SKB023.15.00.000

Resistance zero point accuracy check. Value – 0.000 µOhm.

Shunt
  • Shunt
  • Shunt

Type: 75ShSM M3 (75ШСМ М3). For checking MIKO-8M operability. Value – 1 µΩ ± 0.5%.

Safety devices
  • Safety devices
  • Safety devices

Type: VP2B-1V-2A (ВП2Б-1В-2А) (2 pcs). For the power source protection.

Attachment devices set kit
  • Attachment devices set kit
  • SKB126.06.02.000
  • Attachment devices set kit
  • SKB126.06.02.000

Additional complete set (on order)

Photo Item, Index Application
Measuring cable
  • Measuring cable
  • SKB041.18.00.000
  • Measuring cable
  • SKB041.18.00.000

Current cable 1 x 8.5 m with crocodile clips (jaw up to 80 mm). Weight 1.72 kg.
Elastic silicone tube resistant to low and high temperatures and corrosive media.

Measuring cable
  • Measuring cable
  • SKB041.26.00.000
  • Measuring cable
  • SKB041.26.00.000

Current cable 1 x 8.5 m with a G-clamp (jaw up to 103 mm) for connection to transformer. Weight 2.26 kg.
Alternative version of measuring cable СКБ041.18.00.000. Elastic silicone tube resistant to low and high temperatures and corrosive media.

Measuring cable
  • Measuring cable
  • SKB041.19.00.000
  • Measuring cable
  • SKB041.19.00.000

Current cable 1 x 3 m. Weight 0.5 kg.
With 2 crocodile clips (jaw up to 25 mm) and 2 removable probes (length: 70 mm, plug: 3 mm) for transient resistance measurement of CT and VT contact joints and windin

Test cables for CT and VT
  • Test cables for CT and VT
  • SKB041.21.00.000
  • Test cables for CT and VT
  • SKB041.21.00.000

Current cable 1 x 4 m with crocodile clips (jaw up to 25 mm) for resistance measurement of CT and VT windings. Weight 0.61 kg.
Capable for in-built and stand-alone transformers / circuit-breaker.

Measuring cable extension
  • Measuring cable extension
  • SKB031.20.00.000
  • Measuring cable extension
  • SKB031.20.00.000

Extension cable 1 x 6.5 m. Weight 1.18 kg.
Elastic silicone tube resistant to low and high temperatures and corrosive media. To be used together with measuring cables SKB041.18.00.000 (jaw up to 80 mm) and SKB041.26.00.000 (jaw up to 103 mm).

Short-circuiting cable (set of 3 pcs.)
  • Short-circuiting cable (set of 3 pcs.)
  • SKB035.31.00.000
  • Short-circuiting cable (set of 3 pcs.)
  • SKB035.31.00.000

Short-circuiting cable set 3 x 12m with crocodile clips (jaw up to 50 mm). Set weight 0.8 kg (0.26 kg + 0.27 kg + 0.27 kg).

The set is used for applying the DRM-test by closing secondary circuits. This cable is for OLTC of power and auto transformers.

Short-circuiting cable (set of 3 pcs.)
  • Short-circuiting cable (set of 3 pcs.)
  • SKB041.23.00.000
  • Short-circuiting cable (set of 3 pcs.)
  • SKB041.23.00.000

Short-circuiting cable set 3 x 3m with crocodile clips (jaw up to 80 mm). Set weight 1.89 kg (0.63 kg + 0.63 kg + 0.63 kg).

The set is used for applying the DRM-test by closing secondary circuits.This cable is for OLTC of power transformers.
Furthermore, this cable is needed for connecting the high-voltage and low-voltage windings when performing measurements in the ‘two consecutive windings’ mode.

Additional resistor
  • Additional resistor
  • SKB032.25.00.000
  • Additional resistor
  • SKB032.25.00.000

For in-place OLTCs monitoring at apparent resistance of the winding of no more than 0.5 Ohm.
Length 0.11 m + 0.35 m. Weight 0.23 kg. 

Tool bag
  • Tool bag
  • SKB126.06.00.000
  • Tool bag
  • SKB126.06.00.000

Удобная, прочная и износостойкая сумка для транспортировки кабелей, документации и прочих дополнительной комплектации к прибору МИКО-8М (МИКО-8МА).

Reference inductor adaptor
  • Reference inductor adaptor
  • SKB023.12.00.000
  • Reference inductor adaptor
  • SKB023.12.00.000

For testing laboratories: inspection / calibration of the instrument.
Length 0,025 m + 0,16 m. Weight 0,04 kg.

Manipulating rod
  • Manipulating rod
  • SKB110.41.00.000
    SKB110.41.00.000-01
    SKB110.41.00.000-02
  • Manipulating rod
  • SKB110.41.00.000
    SKB110.41.00.000-01
    SKB110.41.00.000-02

The rod is designed to ensure convenient connection to contacts of a transformer inputs.

The rod is completed with a clamp with current and potential contacts connected by wires with the measurement platform. Test cables are connected to the measurement platform from the ground.

  • Open Original

    Branch "Gusinoozyorskaya SDPP" JSC "Inter RAO – Electric Power Plants"

    Our company has been using MIKO-8M ohmmeter since 2018.

    The device is built into a good robust case that is convenient for transportation in the extreme conditions of Russian roads. Device is equipped with comfortable-to-use control via buttons and multi-touch screen. The key point when choosing a device was the upper board of resistance range, as we are faced with the measurements of voltage transformers, and the price. MIKO-8M seemed to be an ideal choice. One more advantage is that test cables are not included to the complete set of the device because we were able to choose the most suitable one and not to overpay for cables that we would not use in our work.

    The device is doing well with the assigned tasks:

    1. resistance measurements of voltage transformers 15-220 kV;
    2. resistance measurements of generators and electric motors windings;
    3. winding resistance measurements of power transformers 6-220kV.

    We would like to recommend MIKO-8M(A) milliohmmeter to other companies that are involved in the energy industry.

  • Open Original

    TESS Siberia, LLC

    We have been using MIKO-8M(A) for two months. And the following positive advantages were revealed during the operation process:

    1. Built-in rechargeable battery allows to make measurements without connecting the device to the network.
    2. Checking the continuity of the measurement circuit of the object allows you to make sure that the device is connected correctly.
    3. The presence of the multi-touch screen and buttons ensures reliable control of the device.
    4. Extended resistance range up to 10 kΩ (comparing to MIKO-7) allows to measure resistance of the voltage transformer windings.
    5. The presence of the archive ensures convenient processing of the numerous measurement results in various objects.

    Revealed remarks:

    1. The inscription "Measurement in progress, do not break the circuit" is too small, hardly noticeable in sunlight (it is worth increasing the font of all inscriptions).
    2. It is necessary to increase the volume of the sound signal, because in conditions of heightened noise level it is not audible (in MIKO-7 the sound signal is much stronger).
    3. For the convenience of typing on the keyboard, please add a virtual QWERTY keyboard.
  • Open Original

    Slutsk Electric Networks (RUE Minskenergo)

    We have been operating MIKO-8M(A) milliohmmeter for two years, and the advantages of the device are the following:

    • portability;
    • compact size;
    • informative menu;
    • availability of the DRM test;
    • possibility of use on high-inductive equipment.

    The disadvantage is a small internal memory for information storing.

    MIKO-8M(A) milliohmmeter deserves a high rating according to its characteristics. We are looking forward to new developments.

  • Open Original

    MegionEnergoNeft, LLC

    In May 2018, MegionEnergoNeft LLC received a pilot operation of the MIKO-8 device for measuring the direct current resistance of windings of oil and dry transformers from 0.4 to 110 kV of various types and designs. The device was operated both during the repair of electrical equipment during the repair of power transformers, and at transformer substations in the course of acceptance tests of electrical equipment serviced by MegionEnergoNeft LLC.

    During exploitation, the advantages of the instrument were revealed, for example: small dimensions, a convenient housing for transportation and operation, an intuitive menu, a built-in measurement archive that allows you to speed up the measurement, simplify the processing of the results and automatically recalculate the data. Measurements are carried out in a short time, which in comparison with other devices significantly reduces the time of measurements. A positive feature of MIKO-8 is the ability to measure the resistance of the windings of power transformers with on-load tap-changers without disconnecting the device from the network and the equipment being measured, which significantly reduces the time it takes to take measurements.

    Information is displayed on a large contrast screen that allows readings without voltage. During operation, no shortcomings were detected, the device works flawlessly.

    As wishes for additional equipment, there is not enough portable compact battery pack with a built-in charger and a plug for connecting in the field [Manufacturer comment: The MIKO-8 millimeter is discontinued – in its place is a new modification of the MIKO-8M / MIKO-8M(A) (with built-in battery)].

    According to the results of trial operation, it was found that this instrument meets the declared characteristics and significantly superior to instrument of a similar purpo

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