Models:
- MOM3 std with all accessories except Kelvin cables BK-30091
- MOM3 with Kelvin probes and MOM2 Win; 1.3m cable set BK-30191
- MOM3 with Kelvin clamps 3m cable set BK-30291
- MOM3 with Kelvin clamps 5m cable set BK-30381
The MOM3 is a handheld, high-current micro-ohmmeter designed with ease of use, versatility and safety in mind. Being rugged, lightweight and handheld makes the MOM3 very suitable for fieldwork. Using the included carrying strap it can be brought with confidence even to the hard to reach test objects. Its strong rubber body makes it extra durable should it accidentally be dropped.The MOM3 is designed to enable a full day’s work of testing without recharging the battery. It can store more than 2000 test values, and transfer test data via USB-C to a PC.
The MOM3 uses two ultracapacitors to generate the current output. Thanks to the low internal resistance, ultracapacitors are capable of instantaneous delivery of very high currents,in MOM3 up to 300 A up to 2 mΩ. With ample energy stored in the ultracapacitors, it is possible to make multiple tests in very rapid sequence. The current output of MOM3 is also regulated and kept at the set value for the duration of the test time.
With an ultra-short measurement time, the MOM3 does not heat up the measurement object and thus eliminates the need for bidirectional measurements otherwise commonly used in micro-ohm measurements.
The MOM3 test system is designed to serve several applications. The most common tests are contact resistance measurements and connection checks for low, medium, and high voltage circuit breakers, as well as for busbar joints and connections. MOM3 is also ideal for all applications in which a low resistance need to be verified, e.g. in switches, disconnecting devices, safety ground connections, welding points, fuses and cables.
If the measured resistance is abnormally high this will lead to power loss and temperature rise, which often leads to serious trouble. To avoid such problems, it is necessary to check the resistance at regular intervals.
The following table demonstrates how important low resistance is at high currents:
Current Contact resistance Power loss
10 kA 1 mΩ 100 kW
10 kA 0.1 mΩ 10 kW
1 kA 1 mΩ 1 kW
1 kA 0.1 mΩ 100 W
At 10 kA, a resistance of 0.1 mΩ gives a power loss of 10 kW. This power loss at one single point will definitely result in a temperature rise, which may lead to overheating and possibly premature failure.
