What does a megohmmeter measure?

A megohmmeter is a specialized instrument used to measure the insulation resistance in electrical equipment. It applies a high voltage, typically ranging from 250 to 1000 volts, to the insulation of wires, cables, and electrical devices to evaluate how well they can resist electrical leakage. This resistance is measured in megohms, which is where the name megohmmeter comes from.

Ensuring proper insulation resistance is crucial because it helps prevent unwanted current flow through paths that may lead to shorts, electrical failures, or potential hazards such as shocks and fires. A low insulation resistance reading from a megohmmeter indicates that the insulation may be compromised, which can lead to dangerous situations if not addressed.

The other measures mentioned, such as voltage levels, current flow, or power consumption, are related to different aspects of electrical systems but are not the primary function of a megohmmeter. It's important to understand that different tools and instruments are necessary for measuring these other parameters, which highlights the specific role of the megohmmeter in evaluating insulation resistance.