Method of testing

Insulation Resistance

The insulation resistance test can be performed at devices of protection class I as well as protection class II. It is checked, whether the ohmic insulation resistance exceeds the limit value stipulated in the standards. The test is to detect, whether too high leakage currents could occur in the test object.

If the insulation resistance is too low (and if there is also a PE error), a too high touch voltage could occur at the metallic parts of the device. If these metallic parts were touched, the so-called touch current could run through the person to ground.

Especially at devices of protection class II, insulation faults at metallic parts can be very dangerous, because a discharge of the current via the PE is not possible.

The measuring of the insulation resistance is performed by connecting a 500 Volt DC test voltage to the current-conducting leads against ground. In this process the current-conducting leads are often connected to each other. In this case the total resistance of all insulation resistors switched in parallel is detected during the test.

Since the test is performed with direct voltage, the insulation capacities do not influence the test. Only the ohmic insulation resistances are detected.

If the insulation capacities are quite high, the insulation-resistance test must be take longer, so that the insulation capacities can be charged at the beginning of the test. This can possibly take some 1/10 seconds, because at the insulation resistance-test the test current is limited to max. 3mA.

Insulation resistance tests are often performed at various test points by contacting the test points manually with high-voltage test pistols.

It is also possible to build fully-automatic testers with extensive matrices (switch-over fields) for the automatic testing at several HV test points. There is almost no limitation for the amount of matrix points.

Easy switchover to test from different test points against a central test point, e.g. for testing PE.

2-wire matrix, to test any test points "anyone against anyone".

Which testers does SCHLEICH supply?

single testers
combination testers (combination with safety tests)
Different versions in the range of 10 TΩ
Manual tests via test probes
fully automatic tests
matrices with up to 500 clamps and fully-automatic switchover
various tester classes

Standard committees

For legal reasons, in many cases, we cannot make an obligatory statement about the test conditions. Important for the application is the currently valid standard for your product to be tested.

Depending on the geographical location of the product, the standards to be applied can vary. For further information, please refer to the following institutes.

Request detailed information - The SCHLEICH test methods Fibel

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