Industrial micro-ohmmeter MIKO-1


  • Safety Test Certificate IEC 61010-1:2001
  • Russian State Register Certificates
  • Declaration of Conformity of the Customs Union
  • Russian Register of Innovative Products
  • Recommended for use in JSC Russian Railways electric installations

Resistance measurement in the range 1 μΩ - 20 mΩ


Auto resistance range selection


Test current up to 50A


Test current of MIKO-1 flows stably and enough time


Stable operation in the presence of powerful industrial frequency interference


Self-contained power supply


Test cable set with ergonomic design


Simplicity and portability


Operation in all weather conditions


Industrial micro-ohmmeter MIKO-1 is designed to measure the contact resistance to dire­ct current:

  • contacts of high-voltage and automatic circuit breakers;
  • relay contacts, disconnectors;
  • bolted, welded and brazed joints of current leads and busbars;
  • rail connections, wagon wheel pairs, etc.

User participation in the measurement process is minimal. The me­asurement process is started by pressing one button, without any additional settings.

To obtain reliable values, it is recommended to make measurements at the test current as close to the object nominal current as possible.

Measurements are made using a hi­ghly stable DC current. This all­ows measuring the electrical resis­tance of circuits containing current transformers, which are usually fitted on high-voltage dead tank circuit breakers.

MIKO-1 is designed for operation in harsh electromagnetic e­nvironment of power stations and sub­stations, with measuring channels of the de­vice allowing to suppress electromagnetic interference of industrial frequency.

Integrated battery in MIKO-1 provides its portability and has a capacity sufficient to per­form to 50 measurements. It is charged from an internal charger powered by the mains.

The device has a small weight (3.6 kg) and small dimensions; a special bag provid­es its convenient movement, which allows to connect it on various circuit breakers.

If you have to carry out diagnostics in difficult weather conditions, you can be sure of the accuracy of the results. MIKO-1 micro-ohmmeter is guaranteed to operate at temperatures from -15°C to + 40°C.

Specifications Value
Resistance range 1 μΩ - 20 mΩ
Resolution 0.1 μΩ
Accuracy ±(1+0.01*Rх) μΩ,
where Rx is measured resistance value
Test current output up to 50 A
Measurement display resolution 6 digits
Power supply (built-in battery) Lead A506/3.5 S1
Battery charging time < 4 h
Battery lifetime 3 years
Power supply (mains voltage) 100-242 V AC, 50 Hz
90-300 V DC
Internal memory -
Number of measurements with a fully charged battery 20 - 50
PC connection -
Display Monochrome, alphanumeric
Power consumption <20 W
Dimensions 250 х 80 х 210 mm
Device weight 3.6 kg
Environmental protection IP 20
Operating temperature range from -15°C to +40°C
Interface and user manual language English
Calibration period 1 year
Warranty period 13 months

Standard complete set

Photo Item, Index Application
Main instrument MIKO-1
  • Main instrument MIKO-1
  • Main instrument MIKO-1

Instrument and additional documents: Calibration Certificate, User Manual, Log Book.

Test cable
  • Test cable
  • Test cable

50А Kelvin clamp test cable with jaw up to 50 mm. Length 2.1 m + 3.5 m.

Mains cable
  • Mains cable
  • Mains cable

For battery charging through the built-in charger. 2 meters long.

  • Shunt
  • Shunt

Type: 75 ShSM 75-0.5 (75ШСМ 75-0,5). For checking MIKO-1 operability.

  • Fuses
  • Fuses

Type: VP2B-1V-2A (ВП2Б-1В-2А) (2 pcs). For the power source protection.

Tool bag
  • Tool bag
  • Tool bag

Convenient and wearproof bag for transportation of the device, documentation and accessories.
Weight 0.52 kg.

Additional complete set (on order)

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

50A Kelvin double hand spike test cable. It is used when it is impossible to connect to the object with test cable, for example, when monitoring the resistances of busbars and connecting buses. Length: 0.8 m. + 1.8 m.

Test cable
  • Test cable
  • Test cable

50A Kelvin double hand spike test cable with rotating contacts. An alternative version to test cable, as well as if it is impossible to connect to the object with test cable, for example, when measuring contact resistances in hard-to-reach places of objects with painted surfaces. Length: 0.8 m. + 1.8 m.

Potential probe (2 pcs.)
  • Potential probe (2 pcs.)
  • Potential probe (2 pcs.)

For connection to the input pin. Recommended to be used together with

Potential spring-loaded contact (2 pcs.)
  • Potential spring-loaded contact (2 pcs.)
  • Potential spring-loaded contact (2 pcs.)

For connection to the input pin. Recommended to be used together with

Battery А506/35S
  • Battery А506/35S
  • Battery А506/35S

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

For testing laboratories: inspection / calibration of the instrument.

Manipulating rod
  • Manipulating rod
  • Manipulating rod

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.

Circuit breaker analyzer PKV/M6N and microohmmeter MIKO-1
  • Open Original

    Minsk republican unitary enterprise of electric power engineering Minskenergo, the branch Stolbtsov electric networks

    Our company has been operating SKB EP, LLC (Irkutsk) instruments since 2006: PKV/M7, MIKO-1, MIKO-2.3. These instruments are used by specialists from electrical substation service department to analyze vacuum and oil HV circuit breakers at a voltage of 6-10-35-110-220 kV, as well as to analyze disconnecting switches of 35-110-220 kV. There are HV circuit breakers of the following types among them: MKP-110, VMT-110, VEB-110, VGT-110, U-220, VMT-220, S-35M, VT (VTD)-35, VM (VMD)-35, VK (VKE)-10, VVE-M-10, etc. The advantages of PKV/M7 are the ease of operation, the ability to determine defects without disassembling a HV circuit breaker, the ability to view the data from the gained measurements and graphs of dynamic characteristics, the choice between local and remote type of triggering, the ability to use it on almost all types of switching equipment, the great number of controlled parameters and their accuracy and the compactness. The instrument is put in a protected case, that is important when transporting and working at the electric power substation. MIKO-1 and MIKO-2.3 are used to measure the transient resistance of switching devices contact joints with a voltage of 6-10-35-110-220kV. The advantages of the instruments are: a low weight, size and compactness, a durable housing, the sufficient current for conducting necessary measurements, the autonomous power supply (MIKO-1) and the ease of use that much important.

    We recommend these devices to all energy organizations and enterprises.

    V.V. Rublevsky

  • Open Original

    The branch of FGC UES, PJSC - Karelian enterprise of the main power networks

    A high-voltage circuit breaker analyzer PKV/M7 is operated in the branch Karelian enterprise of the main power networks of FGC UES, PJSC.

    During operation, I may note positive operation of the instrument in the diagnostic of such HV circuit breakers as U-220, U-110, VMT-220, VMT-110 and the ease of use.

    The instrument measures the speed and time parameters of a HV circuit breaker operation well, carries out simultaneous measurement in three phases. Also it has a wide variety of attachment devices, which help install transducers on different HV circuit breakers and help make a connection with every computer.

    The ability to make measurements (triggering) of a HV circuit breaker, as well as the opportunity to obtain results in the specialized software allow to significantly reduce the operation time. A special software helps analyze, predict and eliminate various defects immediately on the spot of operation.

    We recommend all companies operating high-voltage circuit breakers and electrical laboratories performing HV circuit breaker diagnostic the usage of these instruments.

    R.A. Valiev
    Acting First Deputy General Director – Chief Engineer – Deputy Chief Engineer – Chief Dispatcher

  • Open Original

    Yamalo-Nenets enterprise of the main power networks the branch of FGC UES, PJSC

    Yamalo-Nenets enterprise of the main power networks the branch of FGC UES, PJSC thanks your company SKB EP, LLC for the fruitful cooperation in the supply of measuring instruments for the diagnostic of high-voltage equipment. We also thank you for prompt, professional work and individual approach, as well as for the high quality of instruments and its components.

    Our company operates such instruments as MIKO (10 pcs.), and PKV (10 pcs.) manufactured by SKB EP, LLC.

    These instruments are used to determine repair quality of high-voltage circuit breakers and disconnecting switches. The contact resistance of the current-carrying circuit, the time and speed characteristics of HV circuit breakers are checked with a help of them.

    The instruments are very convenient, they give an opportunity to identify the worsened condition of contact connectors on HV circuit breakers and of disconnecting switches. They reduce the time for detecting a defect and prevent accidents and technological disturbances. The defects are periodically identified. That fact allows us to schedule a necessary repair work on time and maintain the equipment in a good working condition.

    We recommend these instruments for use in organizations, which operate high-voltage equipment.

    Thank you for your help in solving our production tasks and sincerely hope for further mutually beneficial cooperation.

    Acting Chief Engineer-Deputy Director

  • Open Original

    Vorkutinskiye thermal power plants, LLC

    The electrical laboratory of Vorkutinskaya TPP-2 Vorkutinskiye TPP, LLC T Plus, PJSC has in its instrumental and technical base the following devices manufactured by SKB EP, LLC:

    • MIKO-1 micro-ohmmeter that is used since 2005;
    • MIKO-10 micro-ohmmeter that is used since 2017;
    • PKV/M5N high-voltage circuit breaker analyzer that is used since 2006 with an angular movement transducer DP21 and a linear movement transducer DP12;
    • PKV/M7 high-voltage circuit breaker analyzer with a PUV-regulator device that are used since 2018, with an angular movement transducer DP21 and a linear movement transducer DP12.

    With the help of micro-ohmmeters, electrical laboratory personnel measures DC resistance of contact connections, and PKV/M5N and PKV/M7 devices are actively used to measure the speed and time parameters of circuit breakers of 6, 35 and 110 kV voltage classes.

    Micro-ohmmeters are convenient to use due to their autonomy and mobility. PKV/M5N device, despite its long service life, is relevant during the diagnostic of high-voltage circuit breakers (due to the presence of linear and angular movement transducers in the complete set), but, due to moral aging and replacement with new analogues, the device cannot be supplemented with new components. The new PKV/M7 device is supplemented with all the necessary spare parts, is modern, mobile, accurate and, based on this, is more in demand by electrical laboratory specialists.

    As a result of the operation of devices manufactured by SKB EP, LLC by the personnel of Vorkutinskaya TPP-2, we can say about the reliability and high-quality operation of the above-mentioned devices and express a desire to continue interaction with specialists of SKB EP, LLC on technical and commercial issues.

  • Open Original

    Permenergo the branch of IDGC of Urals, OJSC

    The technical maintenance and repair services of substations of the Permenergo the branch of IDGC of Urals, OJSC have been using PKV/M7, PKV/M6N, PKV/M5 and MIKO-1 devices manufactured by SKB EP, LLC for more than eight years.

    The instrument pool consists of:

    • ten PKV/M7 devices;
    • nine PKV/M6N devices;
    • two PKV/M devices;
    • nine MIKO-1 devices.

    With the use of the above-mentioned devices, the state diagnostics and adjustment of the following switching equipment are performed:

    • oil circuit breakers VMP (E)-10, VMG-133, VKE-10, VMPP-10, VMG-10, VMB-10, VMP-10K, MGG-10, MG-10, VPMP-10, VK-10, VMK-35, VMP-35, S-35, VM-35, VT-35YU, VMUE-35, VMT-110, MKP-110, U-110;
    • vacuum circuit breakers BB/TEL-10, VVE-10, VVE-10, VBE-10, VBE-10, VBE-10, 3AH5, VBE-10, VVE-M-10;
    • SF6 circuit breakers VGBE-35, VGT-110, LTB-145;
    • load break circuit breakers, isolators and short-circuiting equipment.

    During the operation, PKV/M7, PKV/M6N, PKV/M5, and MIKO-1 devices have proven themselves on the good side. Due to the simple interface, they are simple and easy to operate, while they have high measurement accuracy, small overall dimensions and are very reliable.

    PKV/M7 software makes it possible to create and maintain measurement archive, including the ability to enter nominal test data, which, in turn, allows you to conduct a primary analysis of the equipment diagnostic results directly at the workplace.

    PKV-group devices allow you to measure a number of important parameters in one measurement cycle (time difference, pressure, speed, time, etc.), which significantly reduces the processing time and evaluation of the circuit breaker technical condition, and generally reduces the time for equipment repair.

    The devices are equipped with a high-quality set of test cables, clamps, and fasteners.

    We recommend the devices manufactured by SKB EP, LLC to other organizations working in the field of operation and adjustment of electrical equipment.

  • Open Original

    Prioksky EMPN the branch of FGC UES, PJSC

    Currently, the following devices manufactured by SKB EP, LLC are used at the substations of the Prioksky EMPN:

    1. PKV/U3;
    2. PKV/M6N;
    3. PKV/M7;
    4. MIKO-1.

    With the help of these devices, all the necessary time and speed characteristics of high-voltage circuit breakers of various types are removed, as well as the transient resistances of the equipment contacts are measured.

    All of the above-mentioned devices are easy to operate, have a compact design and light weight. These features allow them to be used directly at the installation site of the equipment that is being repaired.

    During the operation, the devices have proven themselves to be good in terms of operation and measurement accuracy.

  • Open Original

    Taksimovskaya distance of power supply the branch of Russian Railways

    In Taksimovskaya distance of power supply we have been operating MIKO-2.3 micro-milli-kilo-ohmmeter manufactured by SKB EP LLC. This is the second device of this type. The first one, MIKO-1, has been in operation at the distance for about ten years and has proven itself perfectly, as well as the new device. With the help of MIKO-2.3 we check DC resistance of the current-carrying circuit of high-voltage circuit breakers. Large values of this resistance can lead to serious damage of electrical equipment and local heating of current-carrying parts. The advantage of MIKO-2.3 is the design of the test cables with a built-in C-clamp, which provides easy and error-free connection to the measurement object. Light weight and small dimensions make it easy to move the device to the measurement equipment.

    I can surely recommend devices manufactured by SKB EP, LLC to other operating companies.

  • Open Original

    PD Cherepovets Electric Power Network the branch of IDGC of North-West, PJSC

    In the production activities, our production department uses the following devices manufactured by SKB EP, LLC:

    • PKV/M7 high-voltage circuit breaker analyzer (in operation since 2008);
    • PUV-regulator dedicated for controlling the drive of a high-voltage circuit breaker at low voltage (in operation since 2019);
    • MIKO-1 industrial microohmmeter (in operation since 2019).

    Above-mentioned devices are used for diagnostics of both Russian-manufactured high-voltage circuit breakers (VMT-110, MKP-110, VT-35, S-35, VK-10, VMP-10) and of foreign production (LTB-145).

    Being used these devices have proven themselves to be the best side. With the help of PKV/M7, it became possible to detect internal defects of the circuit breakers in a non-demountable mode. The functionality of the device is very simple and easy to use. The device allows you to control main characteristics of high-voltage circuit breakers. The main faults identified by PKV/M7 during repairs are the different timing of contact closures. When analyzing the speed characteristics, speed dips are detected that indicate the presence of jamming or mashing in the mechanism and that means that repair is required. Before this device was purchased, all the characteristics had to be taken with the demount of the circuit breaker, which led to an increase in the repair time.

    The device for controlling the drive of a high-voltage circuit breaker at a low voltage (PUV-regulator) was purchased for the needs of our division relatively recently. The presence of this device made it possible to check the operability of a high-voltage circuit breaker at low voltage, which is one of the standards for testing and measurements.

    Industrial microohmmeter MIKO-1 is also relatively new for our company, but it has proven itself only on the positive side.

    All the devices we use are mobile. One more advantage of MIKO-1 is the presence of autonomous power supply.

    We would also like to thank you for holding free webinars dedicated to the study of the devices manufactured by your company.

    I definitely recommend these devices for organizations that operate high-voltage equipment.

  • Open Original

    Central Power Networks the branch of Yakutskenergo, PJSC

    The service of isolation, overvoltage protection and measurements of Central Power Networks of Yakutskenergo, PJSC currently uses 4 measurement devices manufactured by SKB EP, LLC:

    • MIKO-1 - 3 pcs.;
    • MIKO-9A - 1 pc.

    MIKO-1 device has been actively operated since 2012 to measure contact resistance of high-voltage circuit breakers, disconnectors, separators, and other electrical equipment of switchgears. The device is easy to use, has a small weight and dimensions. Due to the reliable contact and cable connections measurement accuracy of the data obtained is high. Furthermore, the device is equipped with a convenient bag. During operation, the device has proven itself as a simple, unpretentious to use, but quite an accurate device.

    MIKO-9A device has proven itself perfectly (it has been in operation since 2019) when working on measuring DC resistance of power and measurement transformers. Among the main advantages of the device, we would like to point out the following:

    • Possibility of simultaneous measurement by 3 phases;
    • Reliable contact and cable connections;
    • High accuracy and speed of the measurements;
    • The ability to compare the data obtained with the factory data directly during the measurement process;
    • Large battery capacity, choice of operation from mains or battery;
    • Compactness, light weight, easy-to-use interface.

    Devices manufactured by SKB EP, LLC have definitely proven themselves on the positive side, no malfunctions were found in their work. These devices can be recommended to the enterprises engaged in the repair, operation and diagnostics of high-voltage equipment.

  • Open Original

    Kuban MEN the branch of FGC UES, PJSC

    I would like to inform you that in the branch of FGC UES, PJSC - Kuban CMEN uses MIKO-1, MIKO-2.3, MIKO-10, and MIKO-21 microohmmeters.

    During the operation, MIKO-group devices have proven themselves to be the best in terms of reliability, ease of use and accuracy of the results obtained on the state of the switching equipment (circuit breakers, disconnectors). The devices are also good at resistance measurement of pressed connections, resistance measurement of transformer windings. The devices are easy to transport (there is a special carrying bag), they are convenient to use due to the small size and built-in power supply.

    Among the disadvantages there is the lack of crocodile clips (or clamps) in the standard complete set for connecting to a large-section busbar (rigid busbar, hollow wires).

    [Manufacturer note]: Device complete set includes those cables that are most often used on various types of objects. Cables that help to measure resistance on large-section busbars are unfortunately used not as often, so they are included to the additional complete set of the devices and are available by request.

    Devices manufactured by SKB EP, LLC gave a good account of themselves and can be recommended to the companies performing adjustment or repair works, testings and measurements.

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