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Hand-held 200 A micro-ohmmeter


  • MOM2
  • Overview  
  • Application  
  • Downloads  

  • Up to 220 A
  • Battery powered
  • Light weighs only 1 kg
  • Safe test – DualGround™
  • Auto range: 1 μΩ to 1000 mΩ
  • Bluetoot® PC communication
  • Complies with IEEE and IEC standards

The MOM2 is designed to measure the resistance of circuit breaker contacts, bus-bar joints and other high-current links. This product is designed with safety, ease of use and versatility in mind.

MOM2 uses an ultra capacitor to generate the high output current. The ultra capacitor is able to store a huge amount of energy compared to conventional capacitors and can deliver very high current during the discharge thanks to its very low internal resistance. The microhmmeter can be used anywhere to measure a low resistance value with high accuracy.

With MOM2 it is possible to make measurements according to the DualGround™ method. This means that the test object will be grounded on both sides throughout the test giving a safer, faster and easier workflow.


MOM2 test system is designed to serve a number of applications. The most common are contact resistance measurements of low-, medium- and high-voltage breakers and also at bus-bar joints, and other high current links. If the contact resistance is too 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 contact with the resistance 0.1 mΩ gives a power loss of 10 kW. This power loss in one single point will definitely confer a temperature rise, which may result in overheating and possibly premature failure. Application examples Circuit Breaker testing

  • Test of circuit breaker contacts
  • Test of the connections to the breaker
  • Testing of Bus-bar
  • Test of Bus-bar joints
  • Test of connections
  • Everywhere you need to test a low resistance/ high current connection
  • Switches
  • Disconnecting devices
  • Safety ground connections
  • Welding points
  • Fuses
  • Cables
  • Both Sides Grounded Many utilities require safety grounds to remain in place during station outages, therefore, the MOM2 was designed with this field safety constraint in mind. DualGround means that the test object will be grounded on both sides throughout the test giving a safer, faster and easier workflow. Minimum time shall be spent in the substation and focus shall be on the test rather than the equipment.