MOM200A   200 A micro-ohmmeter

The MOM200A is a 200 A micro-ohmmeter designed to check and measure contact resistances in high voltage circuit breakers, disconnecting switches (isolators), and busbar joints. The instrument is an excellent choice when 200 amperes or less are needed for a specitic measurement.

Since the MOM200A weighs only about 14 kg (31 lbs), it's easy to bring with you in difficult to reach locations. What's more, it's ideal for finding poor connections since it can put out 100 A for extended periods and its range extends up to 20 milliohms, making it ideal for testing a wide range of connections.

Application examples

A. Measuring the resistance of a circuit breaker element

1. Connect the micro-ohmmeter to the circuit breaker. 

2. Set the current (100 A in this example). 

3. Press the resistance pushbutton.

4. Read the result.

B. Measuring the resistance of busbar joints

1. Connect the micro-ohmmeter’s current cables to the object being tested. Do not connect the sensing cables since measurements will be taken using an external movable voltmeter.

2. Set the current (100 A in this example). 

3. Connect an external voltmeter to the bus.

4. Read the voltmeter (0.1 mV = 1 µΩ in this example).

5. Move the voltmeter to the next joint.

6. Repeat step 4.