Operation Manual

OmegaGTPlus / BetaGTPlus Measurements
59
Measurement of substitute leakage of accessible isolated conductive parts of fixed
installed appliances
Substitute leakage current measurement procedure for CLASS II
Ì Select the Sub leakage S. function.
Ì Set limit value.
Ì Set measuring time.
Ì Connect device under test to the instrument (see figures above).
Ì For fixed equipment connect PE socket of the instrument to metallic
enclosure of fixed equipment.
Ì Press the START key for measurement.
Example of substitute leakage current measurement results
Notes:
Ì Consider any displayed warning before starting measurement!
Ì Substitute leakage current may differ substantially from that of conventional
leakage current test because of the way the test is performed. For example, the
difference in both leakage measurements will be affected by the presence of
neutral to earth noise suppression capacitors.
5.4 Differential current
The purpose of this test is to determine the sum of all leakages flowing from the live
conductor to the earth. Because the differential method for determining leakage current
is used the full and true appliance leakage current is always measured, although there
can exist parallel current paths to ground. Differential current measurement is frequency
weighted for perception / reaction according the standards IEC 60990 and VDE 0404-3.