Insulation Resistance Testers

An insulation resistance tester, also known as a megohmmeter or megger, is a device that measures insulation resistance at the MΩ and GΩ level by applying a DC test voltage between conductors or between a conductor and earth. It is used to find out whether the insulation of cables, motors, transformers and panels is sound before commissioning and during periodic maintenance, and whether it is weakening because of moisture or aging. This category includes Unit models; the product data states test voltages such as 250 V, 500 V, 1000 V, 2500 V and 5000 V, PI and DAR tests, AC and DC voltage measurement, and battery or lithium battery power. Choose a device by test voltage steps appropriate to the rated voltage of the equipment you will test, the highest resistance it can measure, the PI and DAR tests, the short-circuit current and the supply type. PI is the ratio of the resistance at the tenth minute to the resistance at the first minute; DAR is the ratio of the value at 60 seconds to the value at 15 or 30 seconds. The resistance range of a multimeter measures with a low voltage and therefore does not replace an insulation resistance tester.

Products

How to choose Insulation Resistance Testers

An insulation resistance tester, also known as a megohmmeter or megger, is a device that measures insulation resistance at the MΩ and GΩ level by applying a DC test voltage between conductors or between a conductor and earth. It is used to find out whether the insulation of cables, motors, transformers and panels is sound before commissioning and during periodic maintenance, and whether it is weakening because of moisture or aging.

  • Identify the measurement or fastening task and the required insulation safety rating.
  • Select jaw profile, cross-section range and accessories for the conductor or fastener standard.
  • Check CAT voltage category and replacement tip or die availability for field conditions.

Frequently asked questions

What is Insulation Resistance Testers and where is it used?

An insulation resistance tester, also known as a megohmmeter or megger, is a device that measures insulation resistance at the MΩ and GΩ level by applying a DC test voltage between conductors or between a conductor and earth. It is used to find out whether the insulation of cables, motors, transformers and panels is sound before commissioning and during periodic maintenance, and whether it is weakening because of moisture or aging.

What should I compare when choosing Insulation Resistance Testers?

Choose a device by test voltage steps appropriate to the rated voltage of the equipment you will test, the highest resistance it can measure, the PI and DAR tests, the short-circuit current and the supply type.

Where can I find technical details for Insulation Resistance Testers products?

The resistance range of a multimeter measures with a low voltage and therefore does not replace an insulation resistance tester.

Insulation Resistance Testers Selection Guide: Technical Criteria & Application Standards