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

    Engineering solutions and technologies, LLC

    Since 2015, in the electrical laboratory of Engineering solutions and technologies, LLC has being used a device from another manufacturer to measure the ohmic resistance.

    Since 2017, due to the laboratory expansion, MIKO-7 milliohmmeter was purchased that is manufactured by SKB EP, LLC. The reason for the purchase of MIKO-7, and not its analogue that has been properly working, was the measurement speed that made it possible to measure ohmic resistance on power transformers from 6 to 10 times faster. An inconvenience of MIKO-7 was the absence of an in-built battery.

    In 2019, it became necessary to purchase one more device for DC resistance measurements.

    Having considered the offers on the market, the choice was made in favor of MIKO-7MA, because:

    1. MIKO-7 proved to be excellent in its work.
    2. MIKO-7MA got rid of the drawback of the previous generation SKB EP milliohmmeters, namely, it got an in-built battery.

    In practice, MIKO-7MA device perfectly copes with the assigned tasks. According to the subjective feeling of our engineers, MIKO-7 screen is a bit more convenient than the screen of MIKO-7MA. At the same time, MIKO-7MA has pleased our engineers with the in-built function of automatic measurement stop that was previously supplied to MIKO-7 devices for an additional payment.

    MIKO-7MA milliohmmeter manufactured by SKB EP, LLC can be surely recommended for other organizations.

    Moreover, the specialists of our company noted the comfort of working with SKB EP, LLC, attentive attitude towards customers and established feedback.

  • Open Original

    Energoseti Sibiri, LLC

    Our company has been operating MIKO-7MA milliohmmeter manufactured by SKB EP since 2019.

    Energoseti Sibiri, LLC is involved in taking measurements on objects both inductive and non-inductive, and, therefore, we needed a device that enables such measurements. The price of the complete set is also a key. MIKO-7MA met all criteria. We were pleased with the strength of the cables, the presence of an in-built battery, the speed of measurements and the ease of device transportation. One more advantage is the lower limit of resistance range measurement of 1 µΩ.

    The device perfectly copes with the assigned tasks. We can recommend MIKO-7MA milliohmmeter to other companies that are working in energy and other industries.

  • Open Original

    "KazPower Group", LLC

    The companies of our group successfully use MIKO-7MA milliohmmeter. The device has a modern interface and is very easy to use. Another advantage of the device is its portability. The device copes perfectly with the assigned tasks. We can definitely recommend MIKO-7MA milliohmmeter to all companies operating, repairing and diagnosing high-voltage circuit breakers and transformers.

    Considering the above, we are ready to recommend MIKO-7MA for other companies, whose main criteria are the presence of an in-built battery, and the reliability of the device and the cables.

  • Open Original

    Electrical equipment service, LLP

    1. What device do you use (number of devices used)? For how long?
    We have been using MIKO-7MA milliohmmeter for 1 month.

    2. What equipment do you check with the devices manufactured by SKB EP, LLC?
    Power transformers, current transformers, voltage transformers, etc.

    3. How convenient is it to use the device?
    It is very convenient to use MIKO-7MA, the device itself is very easy to use.

    4. What functions of the device do you consider the best?
    Very fast measurement of the resistance.

    5. What problems or malfunctions were detected using the device? On what kind of high-voltage equipment?
    A fault of the power transformer winding was detected.

    6. Specify the economic effect you received from using the device: the number of detected faulty objects from the entire list of diagnosed equipment, the number of saved man-hours when working with the device compared to using old methods of measurement, etc.
    This device takes less time to measure the parameters of electrical equipment, thereby its use causes a positive economic effect.

    7. Can you recommend our devices to other organizations?
    Yes, we will recommend it.

  • Open Original

    FSFI CSM of Novosibirsk region

    MIKO-7M milliohmmeter has been used by FSFI CSM of Novosibirsk region since 2019.

    The device has a clear-to-understand software and user-friendly interface. Furthermore, the device itself is easy to use in measurements.

    Stated characteristics of the device are fully confirmed in practice.

    The advantages of MIKO-7M are its compact size, light weight and the ability to work from the network.

    In addition, the device has shown good repeatability of the results, a wide range of resistance range, and ability to adjust test current manually.

    We recommend MIKO-7M milliohmmeter manufactured by SKB EP, LLC for use in specialized enterprises.

  • 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.

  • 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

    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

    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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