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 μΩ - 2 kΩ

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Automatic setting and systematization of measurement results

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High precision measurement modes

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High level of protection and safety conformity

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Non-volatile memory 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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Milli-ohmmeter – easy-to-use, modern and convenient instrument

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The MIKO-7M(A) milli-ohmmeter is developed to measure DC resistance in the range of 1 µΩ - 2 kΩ with test current up to 10 А for:

  • Windings of power and instrument transformers, windings of electric motors, generators, linear compensators and windings of other high-inductance equipment;
  • Contacts of circuit breakers, resistors, buses and other non-inductive circuits;
  • Compensatory, current limiting and other resistors of high-voltage circuit bre­akers;
  • Сables.

The instrument ensures fully automated resistance measurement of highly inductive load and thermal EMF balancing in external circuit.

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

The instrument integrates special-purpose modes for measuring 5 objects with account of their specific features: resistive and inductive objects; voltage transformers; current and power transformers. This functionality enables systematization of measurement results, as well as provides comfortable archive work.

MIKO-7M(A) automatically considers configuration of the object to adjust the measurement mode.

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 closing.
  • SINGLE: the measurement starts upon the user's command (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 initiated by pressing the START button and will be stopped 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 test current;
  • EMF of self-induction;
  • overheat of the test block.

At disconnection of the test 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 test 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 the data obtained. And due 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 a cloud via Bluetooth connection.

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 test cables is included to the standard complete set of MIKO-7M(A) device. This allows the customer to choose exactly required cables.

For user's choice and convenience of connecting to the object, there are special test cables designed of different lengths and different types of clamps/fasteners:

  • 10A Kelvin Clamp test cable 1 x 8.5 m (jaw up to 80 mm);
  • 10A Kelvin C-clamp test cable 1 x 8.5 m (jaw up to 103 mm) for connection to transformer;
  • 10A Kelvin Clamp test cable 1 x 4 m (jaw up to 25 mm) for resistance measurement of CT and VT windings;
  • 10A Kelvin test cable 1 x 3 m (0.5 kg) with 2 probes and 4 crocodile clips (jaw up to 25 mm) (length: 70 mm, plug: 3 mm) for contact resistance measurement of CT and VT contact joints and windings.

For user’s choice MIKO-7M milli-ohmmeter has two modifications: with a built-in battery (MIKO-7MA) and without a built-in battery (MIKO-7M). The device can also be powered from the mains (AC 90-253 V, 47-63 Hz // DC 127-354 V).

This 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 - 2 kΩ
Resolution capability 0.1 μΩ
Accuracy ±(0.1%+0.5 μΩ)
Test current output 0.01 - 10 A
Measurement display resolution 5 digits
MIKO-7MA: Power supply (built-in battery) Li-ion battery
MIKO-7MA: Battery charge time 3 hours
MIKO-7MA: Battery runtime (in continuous operation) with output capacity 1W 8 hours
Built-in memory up to 200 measurements
PC connection USB cable and Bluetooth
Display Monochrome, 128 x 64 pixels
Power consumption 120 W
Output capacity 60 W
Power supply (mains voltage) AC 90-253 V, 47-63 Hz
DC 127-354 V
Dimensions 270 х 250 х 130 mm
MIKO-7MA: Main instrument weight with battery 4.0 kg
MIKO-7M: Main instrument weight without battery 2.7 kg
Operating temperature range -20ºС - +55ºС
Environmental protection with open cover IP40
Environmental protection with closed cover IP67
Interface and user manual language English
Testing period 3 years
Calibration period 3 years
Warranty period 3 years

Standard complete set

Photo Item, Index Application
MIKO-7М or MIKO-7MA<br>main instrument
  • MIKO-7М or MIKO-7MA
    main instrument
  • SKB048.00.00.000
    or SKB048.00.00.000-01
  • MIKO-7М or MIKO-7MA
    main instrument
  • SKB048.00.00.000
    or SKB048.00.00.000-01

Instrument and documents: User Manual and a Log Book.

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

As a matter of convenience for the user, test cables are not included to the standard complete set. Each user can select a cable to his/her own requirements. Please, select at least one test 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 m. Weight 0.08 kg.
For instrument grounding. The cable is equipped with a ground clamp and a screw end cap. Nominal test current is 50 A.

Zero resistance standard
  • Zero resistance standard
  • SKB023.15.00.000
  • Zero resistance standard
  • 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(A) operability. Value – 1 mΩ ±0.5%.

Fuses
  • Fuses
  • Fuses

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
Test cable
  • Test cable
  • SKB041.18.00.000
  • Test cable
  • SKB041.18.00.000

10A Kelvin Clamp test cable 1 x 8.5 m (jaw up to 80 mm). Weight 1.72 kg.
Elastic silicone tube resistant to low and high temperatures and corrosive media.

Test cable
  • Test cable
  • SKB041.22.00.000
  • Test cable
  • SKB041.22.00.000

10A Kelvin Clamp test cable 1 x 8.5 m (jaw up to 80 mm) for connection to transformer bushings. Modification of the SKB041.18.00.000 cable. To be used on transformers with bushings located close to each other. Weight 1.72 kg. Elastic silicone tube resistant to low and high temperatures, and corrosive media.

Test cable
  • Test cable
  • SKB041.26.00.000
  • Test cable
  • SKB041.26.00.000

10A Kelvin C-clamp test cable 1 x 8.5 m (jaw up to 103 mm) for connection to transformer. Weight 2.26 kg.
Alternative version of test cable SKB041.18.00.000. Elastic silicone tube resistant to low and high temperatures and corrosive media.

Test cable
  • Test cable
  • SKB041.19.00.000
  • Test cable
  • SKB041.19.00.000

10A Kelvin test cable 1 x 3 m. Weight 0.5 kg.
With 2 probes and 4 crocodile clips (jaw up to 25 mm) (length: 70 mm, plug: 3 mm) for contact resistance measurement of CT and VT contact joints and windings.

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

10A Kelvin Clamp test cable 1 x 4 m (jaw up to 25 mm) for resistance measurement of CT and VT windings. Weight 0.61 kg.
Cable is used for CTs and VTs which are stand-alone or built into transformers / circuit breakers.

Test cable
  • Test cable
  • 041.28.00.000
  • Test cable
  • 041.28.00.000

10A Kelvin test cable 1 x 2.5 m with spring-loaded probes. To be used for electrical resistance measurement in hard-to-reach places.

Test cable extension
  • Test cable extension
  • SKB031.20.00.000
  • Test 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 test cables SKB041.18.00.000 (jaw up to 80 mm) and SKB041.26.00.000 (jaw up to 103 mm).

Adapter for a reference coil
  • Adapter for a reference coil
  • SKB023.12.00.000
  • Adapter for a reference coil
  • SKB023.12.00.000

Length 0.025 m + 0.16 m. Weight 0.04 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
  • 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

    SIEMENS, LLC

    In 2015, Siemens purchased a device for measuring electrical resistance, MIKO-7 milli-ohmmeter, which is currently successfully operated by our specialists. With the help of this device, the parameters of traction electric motor windings are monitored, as well as all kinds of equipment diagnostics for high-speed electric trains ESl "Lastochka".

    According to the MIKO-7 device operation experience, we can note that this device is easy to use, it has a clear and simple interface. The best function is the ability to automatically select the resistance range.

    Regard must be paid to the plug connectors of the device test cable and mains cable, which are easy to confuse. This can damage the contact pins and damage the device.

    There is a positive moment, that the device can operated not only from mains, but also from the car battery. However, we would recommend your company to add a built-in battery to the device, since it is not always convenient to work from mains or an external power source.

  • Open Original

    Krasnoyarsk Power and Mechanical Plant, LLC

    MIKO-7M milli-ohmmeter has been operated at the Krasnoyarsk Power and Mechanical Plant since May, 2019.

    The device has a clear software, a user-friendly interface, the device itself is easy to use in work.

    The declared characteristics of the device are fully confirmed in practice.

    The advantages of the device are its compact size, light weight and the ability to work from the network.

    In addition, the device demonstrated good repeatability of the result, a wide range of resistance measurements, the possibility of manual adjustment of the test current.

    We recommend this device for use in specialized enterprises.

    The device was recommended to be purchased by the employees of electro technical laboratory of Tomskneftekhim, LLC.

  • 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

    Irkutsk HPP the branch of Irkutskenergo, PJSC

    Specialists of Irkutsk HPP (hydro power plant) have been using the SKB EP instruments for several years. The PKV/M7 instruments were used for measuring time characteristics of moving parts of such circuit breakers as ABB HGI-3 (13.8 kV), AREVA HGF-1012 (110 kV), SIEMENS 3AP1DT-145 (110 kV, 220 kV), and 3AP1DT-245 (220 kV); the MIKO-2.3 and MIKO-7 instruments are used on electric motors (0.4 kV) and disconnecting devices RVR(Z)-20/2000 M-U3, RGNP-110/2000-50UHL1, RDZ-1-110-2000UHL1, and RNDZ-220/2000U1 (13.8/110/220 kV).

    The PKV/M7 instrument meets all our needs in HV circuit breaker diagnosis. It provides convenient control of poles time difference using the PC software that shows defects in a circuit breaker long before they may cause a heavy failure.

    The MIKO-2.3 low / high resistance meter provides quick output of the results of measurements; it is a universal instrument that integrates four modes in one. The instrument is rather convenient and mobile.

    MIKO-7 milli-ohmmeter in the course of operation proved to be rather efficient. The instrument has a robust shock-proof housing that “saved” the instrument many times.

    The updated software of the milli-ohmmeter allowed us to save time and eliminate personnel’s mistakes. When we used a voltampermetre we had to carry several instruments, and a battery; their assembly took time, and measurements on a transformer took two hours minimum. Time of measurements using the MIKO-7 is halved or even makes one third of that.

    Benefits of the PKV/M7 include: information on the results of measurements and ability to operate the circuit breaker from the instrument. The MIKO-2.3 is rather mobile and operative; the MIKO-7 has a large set of functions and automatic mode of operation.

    During the SKB EP instruments operation on the main electric equipment of the plant we did not face any problems, the instruments worked properly, without failures. On the auxiliary equipment the problems with electric motors were timely revealed (inter-winding short circuit, break of windings end).

    Specialists of Irkutsk HPP recommend the PKV/M7, MIKO-2.3 and MIKO-7 to all the companies as they are cost-effective analogues of the instruments of foreign manufacture.

  • 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].

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