How do you read an insulation tester?
If you are testing insulation resistance to ground, place the positive probe on the ground wire or the grounded metal junction box and the negative probe on the conductor or terminal. Energize the Megger for 1 minute. Read the value of the resistance at the end of the minute test and note it in your table.
What is the best insulation resistance tester?
Top 6 Best Megohmmeter Insulation Resistance Testers
- Fluke 1507 Megohmmeter Insulation Tester.
- Fluke 1587 Insulation Tester (2 Gigaohms)
- Extech 380260 Insulation Tester.
- AEMC Megohmmeter Insulation Resistance Tester.
- Megger MIT230 Insulation Tester (1000 Megaohms)
- Amprobe Insulation Resistance Tester (1000 Megohms)
What is a good insulation resistance test result?
Insulation resistance should be approximately one megohm for each 1,000 volts of operating voltage, with a minimum value of one megohm. For example, a motor rated at 2,400 volts should have a minimum insulation resistance of 2.4 megohms.
What is the difference between Megger and 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.
What is a good megohm reading?
Anything reading between 2 megohms and 1000 megohms is usually considered a good reading, unless other problems have been noted. Anything less than 2 megohms indicates an insulation problem.
Can you test insulation resistance with a multimeter?
A multimeter is able measure different magnitudes, including electrical resistance, whose unit is given in ohms. On the other hand, a megohmeter, also known as Megger, is often used to measure the insulation resistance of an insulated body.
What is a good Megger?
Is insulation resistance a live test?
Insulation resistance may be measured between live conductors and protective conductor(s) with all live (line and neutral) conductors connected together (Regulations 612.3.
Why Megger is used instead of multimeter for insulation testing?
Insulation resistance meters are intended for passive equivalent-circuit use-cases. This also explains why it is known as an insulation resistance meter, instead of an ohmmeter. An ohmmeter such as that found in a normal handheld multimeter is not likely to destroy unpowered electronic circuits that it is applied to.
How does Megger insulation tester work?
Definition: The Megger is the instrument uses for measuring the resistance of the insulation. It works on the principle of comparison, i.e., the resistance of the insulation is compared with the known value of resistance. The accuracy of the Megger is high as compared to other instruments.
What is the minimum acceptable insulation resistance for a Class 2 appliance?
2 M ohm
Adequate insulation is defined as greater than 1 M ohm for Class I appliances and 2 M ohm for Class II appliances.