Description
The TENTECH MO2KR Digital Milliohmmeter is a portable instrument designed to measure very low contact resistances in circuit breakers, switches, busbars, transformer windings, motor windings, and more, with high accuracy. It provides test currents ranging from 1 mA up to 1 A. The instrument uses the 4-terminal (Kelvin) method to eliminate measurement errors caused by test leads and their contact resistances.
Measurement accuracy is ensured by a state-of-the-art, offset-free signal amplification system that is highly stable over time. The test current is adjustable by the operator across all ranges, and its value is displayed both graphically (bar graph) and digitally. This feature facilitates the measurement of resistances with significant inductive components, allowing the user to monitor the current ramp-up until stabilization. The open-circuit output voltage can reach up to 10 V, depending on the selected test current, significantly reducing stabilization time when testing inductive loads (especially large transformer windings). The measurement circuit is protected against voltage spikes generated by such inductances.
This instrument is robust, lightweight, and easily portable by a single person. It delivers excellent performance in both laboratory and field applications.
Technical specifications
Test current
1 mA, 10 mA, 100 mA, 1 A.
Each current can be adjusted between 0 % and 100 % of its nominal value
Resistance ranges
0-2 Ω @ 1 A.
0-20 Ω @ 100 mA.
0-200 Ω @ 10 mA.
0-2000 Ω @ 1 mA.
For each nominal current, the ranges are automatically selected to optimize the reading
Resolution
0.01 mΩ @ 1 A.
Basic accuracy of resistance measurement
± 0.2 % of reading ± 2 digits.
Accuracy of test current
± 3 %.
Output voltage
Up to 10 VDC (open circuit) @ 1 A.
Measurement principle
4-terminal, Kelvin-type.
Advanced features
Digital direct reading of low resistances in the alphanumerical display, with up to 4½ digits. Very fast and accurate measurements.
Printer
It has a thermal printer that allows printing the measured values.
Built-in memory
Memory for up to 4,095 measured values (up to 1,365 tests with one measurement each).
Serial data output
USB.
Environmental protection
IP65 (with closed lid).
Safety class
Meets the requirements of IEC 61010-1.
Power supply
Rechargeable 12 V - 3 A internal LFP battery or AC adapter 12 V - 2 A.
Battery charger
AC adapter 12 V - 2 A.
Operating temperature range
23 °F to 122 °F (-5 °C to 50 °C).
Storage temperature range
-13 °F to 158 °F (-25 °C to 70 °C).
Humidity range
95 % RH (non condensing).
Equipment weight
Approx. 6.6 lb (3 kg).
Dimensions
10.79" x 9,84" x 4.88" (274 x 250 x 124 mm).
