Testing insulation resistance is essential to keeping wires and motors working properly. Megohmmeters provide a quick and easy way to determine the condition of the insulation on wire, generators, and motor windings. A megohmmeter is an electric meter that measures very high resistance values by sending a high voltage signal into the object being tested. Typically, however, this is the only function a megohmmeter performs.
While megohmmeters are often informally referred to as insulation testers, strictly speaking this is not accurate. Why? What’s the difference between a megohmmeter and an insulation tester? An insulation tester performs the basic measuring function a megohmmeter does—measuring very high resistance values by sending a high voltage signal into the object being tested—and it often does much more; it usually performs more functions, including more complex testing and recording of measurements.
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