Comparison of SKB EP micro-ohmmeters

There are special instruments for resistance measurement - micro-ohmmeters, which differ in operation principle, metrological characteristics, degree of automation, mass and dimensions parameters and, of course, the price.   

To make the right choice it is necessary to consider the following conditions: the test current should be close to the rated current of the object, it should flow for a sufficiently long time in a stable mode; the error should not exceed 1%; the instrument should be autonomous (built-in battery); the instrument should have small weight and dimensions and, of course, have the test cables set for different configurations of objects.

	MIKO-2.3	MIKO-21	MIKO-1	MIKO-10
Application area
Resistance measurement of high-voltage circuit breakers with and without built-in current transformers, as well as demountable and non-demountable connections
Resistance measurement in the windings of small size power transformers, current and voltage transformers, electric motors, electromagnets, etc.
Temperature measurement of water, air, oil (non-aggressive environments)
General characteristics
Resistance measurement range	0,1 μΩ ÷ 0,1 Ω in micro-ohmmeter mode 100 μΩ ÷ 1 kΩ in milli-ohmmeter mode	0,1 μΩ ÷ 2 Ω	1 μΩ ÷ 0,02 Ω	1 μΩ ÷ 0,1 Ω
Test current range	10 ÷ 1 000 А in micro-ohmmeter mode 0,5 ÷ 5 А in milli-ohmmeter mode	1 ÷ 200 А	до 50 А	1 A / 10 A
Test current adjustment
Accuracy	± 0,2%	± 0,05%	±(1+0,01*Rх) μΩ, where Rx is the measured resistance value, μΩ	± 0,2%
Operating temperature range, ºC	-20 ÷ +40 °С	-20 ÷ +50 °С	-15 ÷ +40 °С	-20 ÷ +50°С
Dimensions, mm	150х190х75	270x246x124	250х80х210	165х100х60
Instrument weight, kg	2,7	3,3	3,6	0,5
Environmental protection	IP20	IP 67 (with closed cover) IP 40 (with open cover)	IP20	IP54
Operation parameters
Display	Alphanumeric, 6 x 2.5 cm	Color graphic display, touch-screen, 480 x 272 pix	Monochrome, alphanumeric	Monochrome graphic display, 128 x 64 pix
PC connection	RS-232 and USB (when using adapter)	USB		USB
Built-in memory	up to 100 measurements	up to 2,000 measurements (64 Mb)		up to 100 measurements
Connecting USB Flash Drives to store/transfer archive data
Instrument control from PC
Built-in battery power	external condenser battery	built-in battery li-ion battery	built-in lead-acid battery A506/3.5 S1	built-in battery li-ion battery
Functions
Sound signal of start-up and end of measurement
Measuring mode: high-voltage circuit breakers without current transformers
Measuring mode: high-voltage circuit breakers with current transformers
Measuring mode: energy-saving - saving up to 50%
Start the measurement "Single" - start by pressing the button.
Start the measurement "Auto single circuit" - the instrument will start measurement when the electric contact between the tested circuit and the test cable contacts is set, with information shown at the display.
Start the measurement "Periodic" - start of the measurement at pre-specified time intervals.
Start the measurement "Auto periodic circuit" - the measurement is initiated for automatic periodic start of measurement upon the closure of the measuring circuit.
Archive of passport values of controlled equipment
Possibility of creating the own template indicating the permissible passport values of the upper and lower resistance thresholds.
Automatic comparison of measured and passport resistance values
Color indication of the permissible limits exceedance