Milli-ohmmeter 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.

Watch detailed video-rewievs about MIKO-7M(A) milli-ohmmeter up above or on our YouTube. Watch videos and subscribe.

The instrument integrates special-purpose modes for measuring fiveobjects 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: 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
  • SKB041.22.00.000
  • Measuring cable
  • SKB041.22.00.000

10A Kelvin Clamp test cable 1 x 8.5 m (jaw up to 80 mm) for connection to transformer inputs. Modification of the SKB041.18.00.000 cable. To be used on transformers with inputs located close to each other. 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 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).

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
  • SKB126.10.00.000
  • Tool bag
  • SKB126.10.00.000

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
  • SKB010.41.00.000
    SKB010.41.00.000-01
    SKB010.41.00.000-02
  • Manipulating rod
  • SKB010.41.00.000
    SKB010.41.00.000-01
    SKB010.41.00.000-02

Manipulating rod is designed for test cables connection from the ground or from the tank cover to the bushings of high-voltage circuit breakers, and to the structural elements of high-voltage disconnecting switches and earthing devices, without the use of ladders or elevated platforms.

The rod is completed with Kelvin clamps with current and potential contacts connected by the measurement pad. Test cables are connected to the pad from the ground or a tank cover.

  • Open Original

    Stankonia, LLP

    MIKO-7M milliohmmeter that we received in December, 2020 corresponds to the description and the declared technical parameters. With this device we check the windings of power and measurement transformers, electric motors, generators, circuit breaker contactors, busbars and other circuits.

    MIKO-7M is very convenient to be used and carried, as it has a protective case. The measurement settings menu is clear, the functionality of the device is more than convenient: there are user-friendly interface, automatic measurement mode selection, high speed and accuracy of measurements. Moreover, test cables remain flexible at subzero temperatures. MIKO-7M milliohmmeter fully meets our needs and requirements.

  • Open Original

    VES Energo Partnership, LLP

    In August 2019, our company purchased MIKO-7 milliohmmeter for the needs of the electrotechnical laboratory. This device was purchased to replace the DC bridge R333.

    During the use, the device has proven itself on the positive side.

    The main advantage that was noted when working with MIKO-7 is the high measurement speed that significantly reduced the time required to check the resistance of the transformer windings.

    I would also like to mention the strong robust and shockproof case of MIKO-7 that allows you to transport the device without fear of damaging it.

    The only inconvenience is the lack of a built-in battery for the possibility of autonomous operation. As far as we know, this flaw is taken into account and corrected in the new modification of the device MIKO-7M(A).

    [Manufacturer note]: You are absolutely right. Modified milliohmmeter MIKO-7M(A) is equipped with a built-in battery. You can learn more about its characteristics on the corresponding page of our website.

    During the entire operation of the device, there were no failures in its operation.

    We look forward to further cooperation and recommend SKB EP as a reliable and competent partner.

  • Open Original

    Electrotechnical Laboratory of the Yaroslavl Power Supply Distance of the Northern Energy Supply Directorate

    To date, the following devices are in operation in the electrotechnical laboratory of the Yaroslavl Power Supply Distance of the Northern Energy Supply Directorate: MIKO-2.3, MIKO-7, PKR-1 and PKV/M7.

    These devices are used in conducting a comprehensive survey of electrical equipment of substations, such as power and converter transformers, high-voltage circuit breakers, and disconnectors. During the tests, SKB EP devices gave a good account of their reliability, stability of operation, and ease of use. When using the above-mentioned devices, total measurement time was reduced.

    The use of PKR-1 OLTC analyzer made it possible to more accurately determine the defects of the power transformer and tap changing device during a comprehensive check-up. The most frequently diagnosed damages are burning and adjustment of the contactor contacts of the tap changing device. The second most common defect is the burning of circuit breaker contacts. One of these defects was confirmed by the visual inspection.

    The use of MIKO-2.3 and MIKO-7 devices that are dedicated to the resistance measurement in inductive circuits gave the greatest reduce of measurement time. When using an AC bridge, one resistance measurement of the 110 kV transformer winding lasted about 1.5 minutes. When using MIKO-2.3 or MIKO-7 devices, the time spent on one measurement was reduced to 30 seconds.

    PKV/M7 circuit breaker analyzer is used for a comprehensive assessment of the state of high-voltage circuit breakers. As the main direction was chosen the assessment of SF6 circuit breakers of MKP-110 type. There is a big survey conducted of SF6 circuit breakers installed instead of oil circuit breakers. The use of PKV/M7 circuit breaker analyzer has reduced the time spent on the diagnostics of circuit breakers, and increased the accuracy of the data obtained. Previously, the measurements of the moving parts movement and compression were controlled by a ruler with oil drained from the circuit breaker tank. PKV/M7 circuit breaker analyzer is, first of all, more comfortable to use and has better accuracy comparing to the previously used methods.

    Having experience in the operation of SKB EP devices since 2016, we can definitely recommend the use of these devices for diagnostics of energy facilities.

  • 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].
  • 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.

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