Supco M501 Electronic Megohmmeter with Service Case, 1000 Megohms Insulation Resistance, 1,000V Test Voltage

The Supco M501 electronic megohmmeter is an insulation tester that has a 1,000V test voltage for measuring insulation resistance up to 1,000MΩ, indicating the condition of windings or cables in motors, switchgears, electrical installations, and other insulated equipment. The meter displays readings on a zone-type scale that indicates "bad", "caution", or "good" insulation condition, and it is built into a hard-shell case for portability and protection. The unit comes with a set of test leads and instructions.

Megohmmeters, also called insulation testers, are electrical test meters that measure resistance to the flow of current in an electrical component or circuit and check the continuity of an electrical circuit to detect electrical problems such as degraded insulation and improper circuit connections in equipment, wiring, and power supplies. Resistance is an indicator of the overall condition of the device being tested. Megohmmeters have an internal power supply, such as a battery or a capacitor, which supplies a test voltage to a circuit or component that is turned off. Test leads are connected in a series to the tester and the circuit or device being tested. The meter calculates the difference in voltage between the leads and measures the resistance. Most megohmmeters have two terminals for test lead attachment. The two-terminal, or two-wire, measurement method includes the resistance of the circuit or device being tested and the resistance of the test leads, and generally provides sufficient accuracy for measuring large values of resistance in insulation testing applications.

Megohmmeters are commonly used for electrical maintenance and testing in industries such as HVAC, transportation, manufacturing, mining, and utilities, among others. Supco, a company founded in 1945 and headquartered in Allenwood, NJ, manufactures test instruments and replacement parts for heating, ventilation, air conditioning, and refrigeration systems.

In this context, H is the height, the vertical distance from the lowest to highest point; W is the width, the horizontal distance from left to right; and D is the depth, the horizontal distance from front to back.

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