Milliohmmeter MIKO-7M(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 ÷ 2 kOhm

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Automatic measurement of three-phase transformers

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Simultaneous resistance measurement across 2 windings

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High level of protection and safety conformity

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Non-volatile memory built-in archive of up to 200 measurements

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Bluetooth data transfer and control

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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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Milliohmmeter – easy-to-use, modern and convenient instrument

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The MIKO-7M(A) milliometer is developed to measure DC resistance in the range from 1 µOhm ÷ 2 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.

The instrument integrates special-purpose modes for measuring five objects with account of their specific features: resistive and inductance objects; voltage transformers; current and power transformers. This functionality enables the user to org­anize the results of measurements, and to ensure comfortable work with the archive.

MIKO-7M(A) automatically takes into account the configuration of the object for setting measurement 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).
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: the measurement is initiatated by pressing the START button and will stopes automatically if criterium specified is reached.
AUTO mode has SKB EP patented automatic measurement method that guarantees results with the highest accuracy. 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-7M (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-7М 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-7M (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 received data can be synchronized with a special mobile application or the cloud via Bluetooth. 

The mobile application will allow you to maintain and systematize the enterprise measurement database, provide additional automatic calculations based on the measured data, and also make it possible to control the device remotely.

None of the measuring cables is included in the standard equipment of the MIKO-7M (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-7M milliohmmeter has two modifications: with an in-built battery (MIKO-7MA) and without an in-built battery (MIKO-7M). The device can also be powered from the mains (≃ 110÷220, 330V).

The instrument is easy and convenient to use and has an intuitive interface that has been repeatedly noted by the users.

In addition, the operating temperature range from -20 ° C to + 55 ° C allows you to work with the device in difficult weather conditions, guaranteeing the stated accuracy of the results.

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 0,01 ÷ 10 A
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 200 measurements
Type of data transmission channel USB, RS-485 and Bluetooth
Display Monochrome, 128 x 64 dots
Maximum consumed power, W 120
Maximum output capacity, W 60
Power (mains voltage) ~ 90-253 V, 47-63 Hz = 127-354 W
Dimensions, mm 270х250х130
Maximum measuring unit weight with battery, kg (MIKO-7MA) 4.0
Maximum measuring unit weight without the battery, kg (MIKO-7M) 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-7М or MIKO-7MA<br>measuring unit
  • MIKO-7М or MIKO-7MA
    measuring unit
  • SKB048.00.00.000
    or SKB048.00.00.000-01
  • MIKO-7М or MIKO-7MA
    measuring unit
  • SKB048.00.00.000
    or SKB048.00.00.000-01

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 instrument connection to the main network. 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 2.24 m. Weight 0.08 kg.
For instrument grounding. Terminated with a G-clamp and a lug for a screw. Rated current is 50A.

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-7M operability.

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). Weight1.72 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 SKB041.18.00.000. 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 windings.

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 СКБ041.18.00.000 (jaw up to 80 mm) and СКБ041.26.00.000 (jaw up to 103 mm).

Cable USB 2.0 A-B
  • Cable USB 2.0 A-B
  • Cable USB 2.0 A-B

USB cable 1 x 2m. For computer connection and data transfer.

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

Reference inductor adaptor 2 x 0.025 m + 0.16 m. Weight 0.049 kg.
For testing laboratories: inspection / calibration of the instrument.

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

Convenient, robust, wear proof bag for transportation of cables, documentation and other accessories to MIKO-7M or to MIKO-7MA instruments.

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

    Individual Entrepreneur Lanovoy

    Our company has been using the MIKO-7M microohmmeter since May 2020.

    A positive point device using in a production environment is protection against external mechanical influences and adverse weather conditions. In our work, it is necessary to carry out a large number of measurements of a 35 kV transformer with a power of up to 1600 kVA. For these needs, the specialists selected MIKO-7M and MIKO-8M instruments, however, given the clearly defined testing mechanism, the MIKO-8M functionality was redundant for us. An important role in choosing a device was played by price and, due to these factors, a decision was made to purchase MIKO-7M.

    The instrument copes with its tasks good, we can recommend it for use by other companies.

    We give our consent to post reviews on the site.
  • Open Original

    JSC "Kostanayskiye mineraly"

    
    
    Received in July 2019, the MIKO-7MA device fully met our expectations. It id easy to operate, with an intuitive interface, there is no need to manually select the measurement limits - it immediately gained recognition in the electrical laboratory.

    Among the main advantages, it is worth noting the presence of a built-in battery, which is very important in our conditions, since often measurements are made not only at substations, but also on equipment in the absence of nearby power sources, at storage sites, in technological workshops, and career auxiliary transformers excavators, KTP, etc.

    The device, designed in the form of a case, convenient for transportation. ETL experts note the accuracy of the instrument readings, the speed of measurements and the possibility of archiving them and the device’s memory.

  • Open Original

    "KEGOC" branch of "Aktobe MES", JSC

    
    
    "KEGOC" branch of "Aktobe MES", JSC hereby informs that from January 30, 2020 to March 14, 2020, we had a MIKO-7M milliommeter on a test drive (temporary use): 

    • The device is convenient and easy to use;
    • Very accurate in readings when measuring calibrated small resistances, shunts (μOhm);
    • Upon the fact of the measurements with the resistance store, the device measured up to 2800 Ohms;
    • The MIKO-7M milliometer has a measuring range from 10 ^ -5 to 1000 Ohms, and for measuring, for example, the high-voltage winding of voltage transformers, a range of up to 20,000 Ohms is needed, so for us, probably, the MIKO-9 milliometer (according to the catalog);
    • The saturation of the windings of large transformers (200 MBA) according to the sensations of MIKO-7M is faster than that of PTF-1.

  • Open Original

    PJSC T Plus Sverdlovsk branch of "Novo-Sverdlovsk CHP"

    On October 21, 2019, SKB Electrotechnical Instrument Making LLC, in a classroom at the Novo-Sverdlovsk Thermal Power Plant, conducted a demonstration and demonstration measurements for MIKO and PKV instruments to employees of the electrotechnical laboratories of several stations of the PJSC T Plus Sverdlovsk branch of "Novo-Sverdlovsk CHP.

    The measurements were performed on the VGM-20 circuit breaker in conjunction with representatives of SKB EP: Konstantin Muravin, Gennady Kurov, Natalia Korneeva. The following devices were demonstrated: the MIKO-21 microohmmeter (transition resistance of the contacts was measured) and the control device for the high-voltage circuit breakers PKV / M7 (the characteristics of the stroke, speed, time, and also the timing of the contacts were taken).

    On 6 kV 5DV-A motors, designed to measure the active resistance of DC windings, the operation of millimeters MIKO-7M (A) and MIKO-9A have been shown.

    Instruments have proven themselves on the good side in terms of operation and accuracy, as well as measurement speed. We recommend them for purchase and operation.

  • Open Original

    AY-TOR, LLC

    The instrument was purchased for checking the validity of our products in a production workshop - current and voltage measuring devices in the I-TOR high-voltage network with a rated voltage of 35, 110kV, rated current of 100-600A, namely: measuring the DC resistance of the current circuit of the device. All equipment diagnosed within a month has shown its serviceability - 12 phases of I-TOR-110kV and 6 phases of I-TOR-35kV.

    Some features of the MIKO-7 device can be identified:

    • ease of use - the device is small-sized, convenient for transfer, quickly brought to a ready-for-measurement state; good repeatability of results;
    • wide range of resistance measurements;
    • low error in the main measurement range;
    • correct measurement of resistance of both active and active-inductive loads;
    • the ability to manually adjust the test current;
    • lack of a built-in battery, operation only from the mains or an external voltage source 12/220V [Manufacturer Note: The new modification of the device - MIKO-7M(A) is equipped with a built-in battery that allows you to work with the device not only from the network].

  • Open Original

    PROMSTROYKABEL, LLC

    Since June 2017, the MIKO-7 instrument has been used to conduct cable and drives acceptance tests. Previously, another device was used for these purposes.

    The MIKO-7 instrument has a modern interface and it is convenient in work. The advantage of the device is also its mobility. The use of this device allowed us to reduce the time allotted for acceptance tests of cables produced by our company.

  • Open Original

    FSUE "PO "Octyabr"

    Upon request for feedback on the use of the device manufactured by your enterprise, we inform you that the MIKO-7 milliohmmeter was used at FSUE PO October, the operating time was 1 year.

    With this device, the transition resistance of the contact areas and the grounding of the product bodies was checked.

    In operation, the instrument is convenient, it is possible to connect the device to a computer and control it from a computer, it is possible to save the measurement results. But there is a drawback: it is inconvenient to take measurements on pads less than 20x20mm (there is no repeatability of measurements, a large measurement error) [Manufacturer comment: the main purpose of the MIKO-7 milliohmmeter is to measure the inductive resistance, therefore, for the work described above, we recommend microohmmeters produced by SKB EP].

    This device can be recommended for electrical equipment maintenance work to check the equipment grounding, transient resistances, connector and adapter pads [Manufacturer comment: to carry out these works, we recommend  microohmmeters produced by SKB EP].

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