1. 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.

2. 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.

3. 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.

4. 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 process upon connection of test cables, activated by pressing the START button.

5. 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.