Cable Insulation Tester

The megger insulation tester is a small portable instrument that gives you a direct reading of insulation resistance in ohms or megohms.

Cable insulation tester.

A cable insulation resistance test is a test that is performed by applying 500 v or more between the conductor and ground and measuring the resulting leakage current. Cable faults cost money and create disruption so there is an enormous demand for cable test techniques to ensure cables and joints are in good condition and to allow cable faults to be located rapidly. The first dc portable insulation tester was developed in 1889 by our founders sydney evershed and ernest vignoles and by 1903 was being sold as a megger insulation tester. An insulation resistance tester is a test instrument that measures current that leaks through the insulation into ground.

The insulation resistance test a k a the megger test is as relevant as ever and in many applications is preferred to other insulation test methods. We look for corrosion on the copper cracks in the insulation moisture on the cables and many other indicators of damage to the cables. With advanced performance the insulation tester line is designed to be safe simple to use and gimmick free. Whether the dielectric is good or bad to evaluate a number of test results on the same piece of equipment you have to conduct the test the same way and under the relatively same environmental parameters each and every time.

For good insulation the resistance usually reads in the megohm range. The insulation condition from values that are only relative.