MICRO-OHMMETER MIKO-1M-50A

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DC electrical resistance measurement in non-inductive circuits in the range from 1 µΩ to 0.1 Ω

Available in two modifications: MIKO-1M-50A and MIKO-1M-100A

Measurement start modes

Pre-measurement circuit integrity check

Measurements in research laboratories and industrial enterprises

Archive and PC data transfer

Built-in battery

Simple. Portable. Reliable

MODERN INDUSTRIAL MICRO-OHMMETER MIKO-1M-50A

The modern industrial micro-ohmmeter MIKO-1M-50A is designed to measure DC electrical resistance in the range from 1 μΩ to 0.1 Ω with an accuracy of ±0.2 %.

Diagnostic objects:

High-voltage and auto circuit breakers;
Releasing, connecting, and disconnecting switches; contactors and relays;
Bolted, welded, and soldered joints of current-carrying wires and busbars;
Rail connections and wagon wheel pairs;
Electric motors, generators, compensators, and other objects (measurement of metal connections).

MIKO-1M-50A is designed for application in electrical power systems, at power plants or substations, at traction substations for electrified transportation, and at industrial facilities.

MIKO-1M-50A provides a test current of up to 50 A and is designed for accurate measurements of low and contact resistances in electrical equipment. The current effectively eliminates the effects of oil and oxide films, allowing for precise measurement of the actual contact resistance of the object.

MIKO-1M-100A modification with a test current of 100 A is suitable for applications requiring a higher test current. It is suitable for measuring DC contact resistances, including high-voltage circuit breakers, where measurements are standardized at higher currents.

The device supports 4 measurement start modes, which provide flexibility and allow users to automate the process depending on their specific tasks.

Single — the user connects the test clamps to the object and presses the START button to perform a measurement. The device takes a single measurement and then waits for the next command.
Periodic — measurements at a set time interval. After pressing the START button, the device automatically starts measurements at the set time interval without user intervention. This mode is convenient when the user's hands are occupied connecting cables or when monitoring parameter changes over time is required.
Periodic circuit — combines automatic start upon closure of the measuring circuit and periodic operation. After pressing the START button, the device waits for the contacts to close; as soon as the contacts are connected, the measurement starts. Measurements continue until the user stops the process.
Built‑in CT — measurements in circuit breakers with built‑in current transformers (CT). This mode accounts for inductance influence and eliminates additional error.

MIKO-1M-100A’s special measurement modes with automatic measurement stop eliminate errors and increase the number of measurements per battery charge.

When connecting the test cables, the device automatically checks the integrity of the measuring circuit. This ensures proper connection and the system's readiness for measurements.

In the event of a connection break, the device promptly sounds an error tone, preventing incorrect results and increasing diagnostic reliability.

The device is designed for operation in the presence of strong industrial frequency interference and ensures effective suppression of such interference. As a result, the instrument can be reliably used for measurements across a wide range of environments, including various research laboratories and industrial production sites with their harsh operating conditions.

MIKO-1M-50A is equipped with a built-in cyclic archive which stores the last 256 measurement results. For convenient data management it can be transferred to a PC via USB (special software is currently under development).

The built-in battery provides full-day operation without recharging. An additional battery unit extends the device's life time and allows for easy battery replacement when the primary battery reaches its end of life.

Measuring high‑power circuit breakers often requires climbing a ladder or using an elevated work platforms. Lightweight micro‑ohmmeter with ergonomic test cables is essential to minimize the number of ascents and descents and to complete the measurement in a single climb.

MIKO-1M-50A features a low weight of 3.5 kg and compact dimensions of 271 × 246 × 124 mm, making it possible to climb to any circuit breaker with the device.

Specifications	Value
Resistance range	1 μΩ - 0.1 Ω
Accuracy	±0.2 %
Test current	50 A
Number of digits in the measurement result	5
Single mode	2 s
Built-in CT	30 s
Battery type	Li-ion
Battery charge time	< 2 hours
Built-in memory (cyclic)	256
PC communication	USB
Display	Monochrome graphic
Power consumption	30 W
Mains voltage	90-264 V AC, 47-63 Hz 127-370 V DC
Dimensions	271 × 246 × 124 mm
Instrument weight	3.5 kg
Environmental protection	IP 67 (device cover closed) IP 40 (device cover open)
Operating temperature	from -20 °C to +50 °C
Warranty	3 years
Service life	10 years
Calibration period	2 years
Interface, User manual language	English

Standard complete set:

Photo	Item, Index	Application
Main instrument MIKO-1M-50A 067.00.00.000/-01	Main instrument MIKO-1M-50A 067.00.00.000/-01	Instrument and additional documents: Calibration Certificate, User Manual, Log Book.
Test cable 067.20.00.000	Test cable 067.20.00.000	Kelvin clamp test cables 2 x 2 m with jaw up to 50 mm. Include a current wire and a potential wire.
Ground cable 010.01.00.000	Ground cable 010.01.00.000	Ground cable 1 x 2 m for instrument grounding. The cable is equipped with a C-clamp and a screw end cap. Rated current is 50 А.
Mains battery charger QC 3.0	Mains battery charger QC 3.0	QC 3.0 charger with USB Type-C and USB Type-A ports for charging MIKO devices.
USB Type-A, USB Type-C Cables 1.5 m 2A	USB Type-A, USB Type-C Cables 1.5 m 2A	USB cable 1.5 m for charging and connecting devices.
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.

Test cables (on order):

Photo	Item, Index	Application
Set No. 1 039.19.00.000	Set No. 1 039.19.00.000	Test cables 2 x 1.5 m (0.87 kg) with spring-loaded spike contacts. Include a current wire and a potential wire. Convenient for measurements in busbars and arc extinguish chambers.
Set No. 2 039.35.00.000	Set No. 2 039.35.00.000	Kelvin clamp test cables 2 x 10 m (7.32 kg) with jaw up to 50 mm. Include a current wire and a potential wire.
Set No. 2 039.27.00.000	Set No. 2 039.27.00.000	Kelvin clamp test cables 2 x 2 m (1.12 kg) with jaw up to 50 mm. Include a current wire and a potential wire.
Set No. 3 039.25.00.000	Set No. 3 039.25.00.000	Kelvin C-clamp test cables 2 x 4.5 m (3.79 kg) with jaw up to 80 mm. Include a current wire and a potential wire.
Set No. 4 039.26.00.000	Set No. 4 039.26.00.000	Kelvin C-clamp test cables 2 x 6 m (5.12 kg) with jaw up to 80 mm. Include a current wire and a potential wire.
Set No. 4	Set No. 4	Kelvin C-clamp test cables 2 x 10 m (16 kg) with jaw up to 80 mm. Include a current wire and a potential wire.
Test cable for sets No. 2, No. 3, No. 4 039.24.00.000 039.24.00.000-01 039.24.00.000-02	Test cable for sets No. 2, No. 3, No. 4 039.24.00.000 039.24.00.000-01 039.24.00.000-02	Test cables for precision measurements and measurements on circuit sections where a test current is applied to the end points. The set includes: A25C Kelvin clamp (2 pcs.) and test probes (2 pcs.). For Set No. 2 – Length: 2 m (039.24.00.000) Weight: 0.068 kg For Set No. 3 – Length: 4.5 m (039.24.00.000-01) Weight: 0.151 kg. For Set No. 4 – Length: 6 m (039.24.00.000-02) Weight: 0.201 kg. The cable can be used for specific resistance measurements of cables.
Set No. 5 039.20.00.000 039.21.00.000/ -01/-02	Set No. 5 039.20.00.000 039.21.00.000/ -01/-02	Kelvin clamp test cable 1 m (0.5 kg) with jaw up to 50 mm. Includes a current wire and a potential wire. Kelvin C-clamp test cable with jaw up to 80 mm. Includes a current wire and a potential wire. The following lengths are available: Length: 3 m (039.21.00.000) Weight: 1.34 kg. Length: 6 m (039.21.00.000-01) Weight: 2.0 kg. Length: 9 m (039.21.00.000-02) Weight: 4.0 kg.
Potential spring-loaded contact 023.21.00.000/-01	Potential spring-loaded contact 023.21.00.000/-01	To be used together with test cables to eliminate high contact resistance between the input stud and the terminal. Applicable with Sets No. 2 - No. 5.
Potential pin contact 023.22.00.000/-01	Potential pin contact 023.22.00.000/-01	To be used together with test cables to eliminate high contact resistance between the input stud and the terminal. Applicable with Sets No. 2 - No. 5.
Test cable 039.37.00.000	Test cable 039.37.00.000	Kelvin C-clamp test cables 2 x 15 m (30.68 kg) with jaw up to 80 mm. The cable clamp has a socket for connecting a remote potential contact.
Test set 039.43.00.000	Test set 039.43.00.000	Kelvin clamp test cables 2 x 10 m (7.9 kg) with jaw up to 70 mm.
Test cable 039.44.00.000	Test cable 039.44.00.000	Kelvin clamp test cables 2 x 13 m (16.53 kg) with jaw up to 70 mm.

Test cables for aviation diagnostics (on order):

Photo	Item, Index	Application
Test set 039.33.00.000/-01	Test set 039.33.00.000/-01	100 A Kelvin double hand spike test cable 2 x 1.5 m (0.471 kg) with spring-loaded contacts with jaw up to 20 mm. One probe is equipped with a control button for measurement start-up. Recommended for contact resistance measurement in hard-to-reach places of objects with painted surfaces; in aviation: for contact resistance measurement of aircraft equipment and helicopter fuselage.
Test set 039.31.00.000/-01	Test set 039.31.00.000/-01	50 A Kelvin test cable with crocodile clips 2 x 1.5 m (0.163 kg) with jaw up to 20 mm. Recommended for resistance measurements in hard-to-reach places; in aviation: for resistance measurement of various elements of the aircraft.

Additional complete set (on order)

Photo	Item, Index	Application
Shunt SV75-0075A-D-02 060.02.18.000	Shunt SV75-0075A-D-02 060.02.18.000	For checking the operability of the device. Manufactured by SKB EP.
Adapter for a reference coil	Adapter for a reference coil	For testing laboratories: inspection / calibration of the instrument, 2 x 0.025 m + 0.16 m (0.04 kg).
Battery unit 067.04.00.000	Battery unit 067.04.00.000	Battery unit for the device's autonomous operation. 5200 mAh. Set includes 1 pc.
Battery unit 055.04.00.000	Battery unit 055.04.00.000	Battery unit for the device's autonomous operation. 7800 mAh. Set includes 1 pc.

Official reviews from customers based on the results of operating SKB EP instruments are available upon request. Please, fill out the form on the website.

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