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High Precision Micro-Ohmmeter MIKO-21

MIKO-21 is designed for high precision measurements of DC electrical resistance in the range from 0.1 µΩ to 2 Ω with an accuracy of ±0.05% and can test

Overview

The instrument is designed for high precision
measurements of DC electrical resistance utilizing
a test current of <200 A and can test:
– contacts of high-voltage circuit breakers of all
types and voltage classes;
– contactors, relays, busbars, various bolted
connections, welded joints, brazed joints;
– elements of equipment for open and closed
switchgears in extreme electric and magnetic field
conditions;
– in research laboratories and industrial
workshops.
 
Battery-operated power supply, low weight and
compact dimensions provide full portability and
high mobility of the instrument in an extended
area.
 

 

Key Features

  • MIKO-21 uses special programmed algorithms for
    measuring contact resistance of high-voltage
    circuit breakers with built-in current transformers
    (CT):
    Mode 1 is designed to measure resistance of
    circuits without current transformers;
    Mode 2 is designed to measure resistance in the
    circuits with the current transformer with minimal
    battery power consumption;
    Mode 3 is designed to measure resistance in the
    circuits with the current transformer at a current
    of 100 A or 200 A without saving battery power.
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Battery-operated power supply, light weight and size

Battery-operated power supply, low weight and compact dimensions provide full portability and high mobility of the instrument in an extended area.

Current output

The user can set the current output in several ways: - By selecting from specified values: 10 A, 50 A, 100 A, and 200 A; - By setting the automatic mode for selecting the current output; - Program a setting of the test current in the range of 1 A to 200 A at a step of 1 A.

Automatic storage of measurement results

The instrument automatically compares the measured resistance value with the nominal value and notifies the user. This feature is implemented through the integral database containing the nominal values of contact resistances of the main contacts of the high-voltage circuit breakers and nominal values for rejected resistors indicating the permissible values of resistance thresholds.

Modes For Measurement

The device has 4 starting modes for the
measurement process:
– Single – normal start by the user pushing the
START button;
– AUTO single circuit – intended for automatic
single start of the measurement process upon
connecting the test cables, activated by pressing
the START button;
– Periodic – intended for automatic start of the
measurement process with a set period after
pressing the START button;
– AUTO periodic circuit – intended for automatic
periodic (continuous) start of the measurement
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Specification

0.1 μΩ – 2 Ω

0.1 μΩ

± 0.05%

1 – 200 А

5 digits

Mode 1   –    ≤2 s

Mode 2  –    10 – 30 s

Mode 3  –   5 – 15 s

Li-ion battery

< 2 h

8 h

2,000 measurements (64 MB)

USB and USB host

Colour graphic touch-screen,
480 x 272 pixels

< 60 W

AC 90-264 V, 47-63 Hz
DC 127-370 V

270 x 246 x 124 mm

3.3 kg

IP 67 (device cover closed)
IP 40 (device cover open)

-20°C – +50°C

English