What is the function of a megohmmeter in electrical testing?

A megohmmeter is specifically designed to measure insulation resistance in electrical systems. This tool applies a high voltage to the insulation of electrical components, allowing the user to determine how well the insulation can resist electrical leakage. High insulation resistance values indicate that the insulation is in good condition, meaning it effectively prevents electrical current from passing through unintended paths, which is critical for the safety and reliability of electrical systems.

Measuring voltage, current, or frequency involves different types of testing devices: a voltmeter for voltage, an ammeter for current, and a frequency meter for frequency. These devices serve distinct purposes and operate on different principles than a megohmmeter, which focuses solely on assessing insulation integrity. The importance of insulation resistance testing cannot be overstated, as degraded insulation can lead to short circuits, equipment failure, and safety hazards. Thus, understanding the specific function of a megohmmeter within electrical testing is essential for ensuring safe and effective electrical system operations.