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P403-3222 Rev. K 4/18
TEST SETUP
Figure 3 shows the test setup required to test a protective ground set. The protective ground set under test
must always be connected between the fixed connection connections regardless of the mode of testing. The
ground set carries the test current from one fixed input to the other during testing. Without the ground set,
the resulting open circuit prevents the resistance measurement. If the ground set is left unconnected and
the ‘INPUT SELECT’ is in the ‘FIXED’ position, the display will read ‘OVER RANGE’ after a test. If the
ground set is left unconnected and the ‘INPUT SELECT’ is in the ‘PROBE’ position, the display will be er-
ratic. The erratic display is unpredictable and does not indicate resistance.
Figure 3: Ground Set Testing Setup