Operation Manual

MI 3310 / MI 3310A SigmaGT Measurements

5.2 Measurements – Single tests for appliances

5.2.1 Earth bond resistance

This test ensures that the connections between the protective conductor terminal in the

mains plug of the DUT and earthed accessible conductive parts of the DUT (metal

housing) are satisfactory and of sufficiently low resistance. This test has to be

performed on Class 1 (earthed) DUT.

The instrument measures the resistance between mains test socket‘s PE terminal and

EB/S terminal.

Earth bond menu

Test parameters for earth bond resistance measurement

OUTPUT Test current [200 mA, 10 A]

LIMIT

Maximum resistance [0.1   0.9 , 1   9 ]

TIME Measuring time [2 s, 3 s, 5 s, 10 s, 30 s]

Test circuit for earth bond resistance measurement

Measurement of earth bond resistance of class I DUT

Earth bond resistance measurement procedure

 Select the EARTH BOND function.

 Set test parameters.

 Connect device under test to the instrument.

 Connect test lead to EB/S output on the instrument.

 Connect EB/S lead to accessible metal parts of the device under test (see figure

above).

 Press the START key for measurement.