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.

The highest accuracy of measurement results under complex electromagnetic conditions is guaranteed by a patented automated measurement method for inductive objects.

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) 90-253 V AC, 47-63 Hz
127-354 V DC
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
  • 048.00.00.000
    or 048.00.00.000-01
  • MIKO-7М or MIKO-7MA
    main instrument
  • 048.00.00.000
    or 048.00.00.000-01

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
  • 018.09.00.000
  • Mains cable
  • 018.09.00.000

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
  • 010.01.00.000
  • Ground cable
  • 010.01.00.000

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
  • 023.15.00.000
  • Zero resistance standard
  • 023.15.00.000

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
  • 126.06.02.000
  • Attachment devices set kit
  • 126.06.02.000

Additional complete set (on order)

Photo Item, Index Application
Test cable
  • Test cable
  • 041.18.00.000
  • Test cable
  • 041.18.00.000

10A Kelvin Clamp test cable 1 x 8.5 m (grip up to 70 mm). Weight 1.72 kg.
Elastic silicone tube resistant to low and high temperatures and corrosive media.

Test cable
  • Test cable
  • 041.22.00.000
  • Test cable
  • 041.22.00.000

10A Kelvin Clamp test cable 1 x 8.5 m (grip up to 70 mm) for connection to transformer bushings. Modification of the 041.18.00.000 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
  • 041.30.00.000
  • Test cable
  • 041.30.00.000

10A Kelvin Clamp test cable 1 x 3.5 m (jaw up to 50 mm) for connection to transformer bushings. To be used on transformers with bushings located close to each other. Weight 0.76 kg. Elastic silicone tube resistant to low and high temperatures, and corrosive media.

Test cable
  • Test cable
  • 041.26.00.000
  • Test cable
  • 041.26.00.000

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 041.18.00.000. Elastic silicone tube resistant to low and high temperatures and corrosive media.

Test cable
  • Test cable
  • 041.19.00.000
  • Test cable
  • 041.19.00.000

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: 30 mm, plug: 3 mm) for contact resistance measurement of CT and VT contact joints and windings.

Test cable
  • Test cable
  • 041.29.00.000
  • Test cable
  • 041.29.00.000

10A Kelvin Clamp test cable 1 x 3.5 m (grip up to 70 mm) for connection to transformer bushings., to be used on transformers with bushings located close to each other. Weight 0.92 kg.
Elastic silicone tube resistant to low and high temperatures, and corrosive media.

Test cable for CT and VT
  • Test cable for CT and VT
  • 041.21.00.000
  • Test cable for CT and VT
  • 041.21.00.000

10A Kelvin Clamp test cable 1 x 4 m (jaw up to 20 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 3 m, 0,54 kg, with spring-loaded probes. To be used for electrical resistance measurement in hard-to-reach places.

Test cable extension
  • Test cable extension
  • 031.20.00.000
  • Test cable extension
  • 031.20.00.000

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 041.18.00.000, 041.22.00.000/(-01) and 041.26.00.000.

Adapter for a reference coil
  • Adapter for a reference coil
  • 023.12.00.000
  • Adapter for a reference coil
  • 023.12.00.000

Length 0.025 m + 0.16 m. Weight 0.04 kg.
For testing laboratories: inspection / calibration of the instrument.

Tool bag
  • Tool bag
  • 126.06.00.000
  • Tool bag
  • 126.06.00.000

Convenient, robust, wear proof bag for transportation of cables, documentation and other accessories to MIKO-7M or to MIKO-7MA instruments.
Weight 0.6 kg.

Manipulating rod
  • Manipulating rod
  • 010.41.00.000
    010.41.00.000-01
    010.41.00.000-02
  • Manipulating rod
  • 010.41.00.000
    010.41.00.000-01
    010.41.00.000-02

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 manipulating rod is completed with special extension cables. There is a Kelvin clamp with current and potential contacts to connect to the object on one side, and a contact pad on the other side. The device test cable is connected to the contact pad from the ground or a tank cover.

Manipulating rod extension cable is made according to a four-wire (Kelvin) scheme with the test current capacity of 100 A in the presence of a good contact.

  • Open Original

    Yugorskaya Territorial Energy Company - Pyt-Yakh, JSC

    Nowadays, the following instruments are operated in YUTEC - Pyt-Yakh, JSC, electrotechnical laboratory: MIKO-1, MIKO-7, MIKO-7M. These instruments are designed for preventive measurements and revealing malfunctions of electrical equipment. MIKO-7 and MIKO-7M milli-ohmmeters in our organization are used to measure resistance of 6 and 35 kV power transformers windings. Unlike a DC Bridge, which made similar measurements, MIKO-7 has established itself as a reliable, compact, high-speed instrument during operation and that fact led to MIKO-7M and MIKO-1 purchase. MIKO-1 micro-ohmmeter is used in our organization to measure contact resistance of contacts of 6-35kV oil-blast, vacuum and SF6 circuit breakers. The precision and ease of measurement, with the addition of prompt obtained result, have removed the previous micro-ohmmeter to the shelf with dust, guaranteed.

    For the present, MIKO-1 has confirmed the reputation of SKB EP, LLC as a high-quality and responsible manufacturer of electrical instruments.

    YUTEC - Pyt-Yakh, JSC thanks SKB EP, JSC for the high quality of instruments and the interest shown in its products after the sale.

    A.V. Turutin
    Director of YUTEC-Pyt-Yakh

  • Open Original

    Balistroyservice, LLC

    Today MIKO-7M instrument is operated in the electrotechnical laboratory of Baltstroyservice, LLC.

    The instrument is used during periodic and acceptance tests of power station electrical equipment, such as power transformers, high-voltage switches, short-circuit swithces.

    MIKO-7M is convenient and easy in operation, has a simple user-friendly interface. The applycation of this instrument has made it possible to reduce the time for measurements.

    I have been operating the instrument for two years and can confidently recommend it for use.

    S.A.Dvornikov
    Head of ETL

  • Open Original

    AtyrauLocalCompany, LLP

    Nowadays the following instruments are operated in the electrotechnical laboratory of AtrauLocalCompany, LLP: MIKO-1 micro-ohmmeter produced in 2016 and MIKO-7MA milli-ohmmeter produced in 2020.

    During the tests, the instruments showed their reliability, stability of operation, ease of use. When using the above mentioned instruments, the measurement time was reduced.

    The use of MIKO-1 and MIKO-7MA instruments gave the greatest reduction in time during the measurements. When using an AC bridge, one resistance measurement of 35kV transformer winding lasted about 1.5 minutes. When using MIKO-1 or MIKO-7MA instruments, the time for one measurement was reduced to 30 seconds.

    L.D.Zairov
    Technical Director

  • Open Original

    Incorporated company "Organika"

    Currently, one MIKO-7MA instrument is used in the electrotechnical laboratory of the power plant of JSC "Organica."

    There have been no shortcomings or low-quality components of the instrument since October 2021.

    The MIKO-7MA instrument is used for diagnostics of 10/0.4 kV power transformers, current and voltage transformers, electric motors, contacts, and contact connections of power circuits, and for measuring DC resistance.
    .....

    With the help of MIKO-7MA, defects in the NLTC were detected, caused by the closing contacts high degree of oxidation in power transformers of 10/0.4 kV.

    A.N. Khomyakov
    Head of Electrical Laborator

  • Open Original

    Spectrum, LLC

    MIKO-7M instrument is in operation in the electrotechnical laboratory of Spectrum LLC.

    This instrument is used when measuring the DC resistance of windings (transformers, arc-extinguishing reactors), the esistances of circuit breakers both newly installed and for diagnostic purposes after emergency situations.

    During operation the instrument proved to be excellent. It has an intuitive interface, high-quality clamps and quick measurement. The robust housing allows you to count on a long life of the instrument.

    The use of MIKO-7M made it possible to abandon the measurement using a DC direct current, which has simplified the measurement procedure and has reduced the time to receive data.

    Using the example of MIKO-7M operation, we can conclude about the high quality of the instruments of SKB EP, LLC and recommend them for use.

    A.I. Kotenev
    Head of the Electrotechnical Laborarory

  • Open Original

    N Resurs, LLC

    The electrotechnical laboratory DZO N-Resurs, LLC, purchased MIKO-7MA instrument in order to conduct electrical equipment diagnostics (power and matching transformers, high-voltage electric motors) owned by the parent company Uralkali, PJSC.

    The instrument has shown itself to advantage during operation. When working with MIKO-7MA instrument, the measurement time is significantly reduced. There are other advantages: low weight, compact size, high measurement accuracy, autonomy (battery availability), that is especially important when working at facilities where there are no power supply sources.

    MIKO-7MA instrument can be recommended as a convenient and modern device for diagnostics at energy facilities.

    Shvarev M.V.
    Operational director

  • Open Original

    Branch of Nadymelektrogaz, Gazprom Elektrogaz, JSC

    The branch of "Nadymelektrogaz" informs you that the instrument milli-ohmmeter MIKO-7M is used at the work site from February 2019.

    This instrument is used to measure the DC resistance of the windings of high-voltage transformers of the TSL, TM, TMG series with a capacity of up to 1600 kVA, as well as additionally to determine the ohmic resistances of the windings of low-voltage electric motors with a capacity of up to 70 KW.

    During the two-year period of milli-ohmmeter use at the Bovanenkovskoye oil and gas condensate field, 4 faulty TSL-6Z/10 transformers were identified, a decision was made on the impossibility of further operation for more than 15 electric motors, up to 80 man-hours were saved.

    Recommendations concerning the operational characteristics of the milli-ohmmeter MIKO-7M are, the possibility of:

    1. Increasing the temperature range of operation of the instrument. The lower temperature limit - from -400С.

    [Manufacturer note]: The instrument MIKO-7M has been certified at operating temperatures from -20 to +55 0С. An increase in the temperature range of operation of the instrument in this version is impossible due to the built-in li-ion battery for the MIKO-7MA modification, as well as measuring shunts that allow measurements to be carried out with minimal error.

    2. Additional test cables with self-locking probes.

    [Manufacturer note]: The configuration of MIKO-7M milli-ohmmeter is quite diverse and is on open access on our official website, if you cannot find the right type of accessory from the presented assortment, we are ready to implement an individual test cable according to your parameters and requirements on order.

    A.M. Girsh
    Branch Director

  • Open Original

    Service company, LLC

    I send you review on the operation of the instrument milli-ohmmeter «MIKO-7MA», this feedback is compiled on the basis of the annual operation of this instrument in various weather conditions and at various measurement objects.

    Milli-ohmmeter «MIKO-7MA» is usually used to measure the transformers parameters, namely to measure DC resistance of windings, as well as for measuring the contact resistance of commutation devices during start-up and commissioning and operation.

    During the operation, there were no significant remarks to the instrument except for a very long charging, but this comment is not essential as it was most likely due to the low temperature of the battery after transportation. I believe this instrument is better than the competitor, as measurements are faster, battery charge lasts for a long time, and the instrument works more «Stable».

    [Manufacturer note]: According to the operation requirements, which are reflected in the documentation supplied with the instrument: "The process of charging the battery of the instrument MIKO-7M(A), after long-term storage can be long - up to 48 hours ..."

    From the improvements I would like to have longer cables, as well as the connectors that are installed on them from the connection of the «Crocodile» clamps would have a more rigid fixation to these clamps.

    [Manufacturer note]: SKB EP company manufactures a wide range of test cables of different lengths, types of fixation and construction, which can be found on the website in the section of a specific instrument complete set. In addition, we can always develop a test cable on an order according to the Client's parameters.

    Lukyanchik V.N.
    Head of the electrical measurement laboratory of LLC «SC»

  • Open Original

    CNGS Engineering, LLC

    Since February 2020 during MiKO-7M(A) operation there has not revealed any shortcomings and failures.

    When measuring direct current resistance of windings:

    • in power and measuring transformers,
    • in electric motors,
    the instrument showed stability, ease of use and accuracy of results.

    CNGS Engineering, LLC thanks SKB EP, LLC for the high-quality instrument and the interest shown in the operating experience and also hopes for production of new developments for power equipment diagnostic.

    Alekseev S.S.
    Director General

  • Open Original

    TDS LTD, LLP

    Currently, a milli-ohmmeter MIKO – 7M(A) is operated in the electrotechnical laboratory (ETL).

    This equipment is used for conducting a comprehensive diagnostic of electrical equipment at substations, windings of power and measuring transformers, electric motors, generators, linear compensators and other equipment with high inductance. The design of this instrument is characterized by its lightness and convenience. I would also like to note the ergonomics of interface, automatic settings and systematization of measurement results.

    When operating the instruments some mismatches were revealed between actual and nominal values of the power transformer windings divergence.

    MIKO – 7M(A) allowed us to expand the functionality of ETL.

    During the tests, the instrument showed its reliability, stability of operation, ease of use.

    Our company recommends using this equipment as a quality guarantee.

    Akhmetov D.K.
    Director of ETL TDS LTD, LLP

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