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Micro-Ohmmeter – Measuring process

Before you connect a test object to an Micro-Ohmmeter, make sure that:

  • the test object is disconnected or separated from its circuit in accordance with the national safety regulations
  • the test object is properly grounded to protective earth (PE)
  • the device itself is properly grounded. To do so, connect the grounding screw on the Device to PE using a grounding cable

Connecting a Test Object to an Micro Ohmmeter With the turned off device, connect it to the test object (RX) in such a way that the measuring cables from the “Voltage Sense” sockets are attached as close as possible to RX, and in between the current feeding cables. That way, resistance of both cables and clamps is almost completely excluded from the resistance measurement.

RMO-A series                                          RMO-G series

Note: Pay attention to polarity while connecting measuring cables. Measuring results will be incorrect as a consequence of error.

Connecting and measuring with current clamp meter

Using the device from the RMO-G series with current clamp meter it is possible to make safer measurement of breakers with both sides of the breaker grounded. Measuring the current through the ground connection and reducing this value from the total current is an additional safety feature.

When connecting current clamp meter pay attention that current circuit of the current clamp meter is enough far away from the rest of current circuits. In that way electromagnetic interference is prevented. Distance between current cables must be more than 10 cm.

Connect cables of the current clamp meter to the appropriate input terminals of device. By pressing the side button open the current clamp meters jaws and clamp one conductor only. The jaw must be firmly closed around the conductor. Make sure that conductor is passed through middle of the hole of current clamp meter. Make sure that the angle is 90 degrees between central axis of conductor and plane of hole of current
clamp meter.

Connecting the Remote Control Unit to RMO and Test Object

The Remote Control Unit is an optional control unit that is used to start and stop the tests from a remote location, away from the actual device. Provided that, for a series of tests, the same test current is fed through the test object, multiple measurements can be carried out with the Remote Control Unit.

Turn off the device and plug in the Remote Control Unit to connector on the front panel.

Connect the Remote Control Unit to the test object (RX) in such a way that the measuring cables from the “Voltage Sense” sockets are situated as close as possible to RX, and in between the current feeding cables from the device. That way, both the cable’s and the clamps’ typical contact resistance is largely excluded from the resistance measurement.

To download .pdf format of this article, please log in and visit the following link. Literature and copyrights are stated in the original document.


November 17, 2021

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