Operation Manual

MI 3310 / MI 3310A SigmaGT Measurements
74
 For more information refer to chapter Measurements according to IEC/ EN
60974-4, paragraph Welding circuit leakage current in 3-phase adapter user
manual.
Examples of welding circuit leakage current measurement results
Displayed results:
Main result ............. welding circuit leakage current
Notes:
 During the test, a mains voltage is connected to the welding machine. Consider
safety precautions.
 Consider any displayed warning before starting measurement!
5.3.7 Primary leakage current
The purpose of this test is to determine the sum of all leakage currents flowing from the
primary circuit to earth. Because the differential measuring method for determining
leakage current is used, the full and true DUT leakage current is always measured,
even when parallel current paths to ground exist in the DUT.
Primary leakage current menu
Test parameters for primary leakage current measurement
LIMIT Maximum current [3.50 mA, 5.00 mA, 10.00 mA, none]
TIME Measuring time [2 s, 3 s, 5 s, 10 s, 30 s, 60 s, 120 s, 180 s, none]
Key (F2)
CHG-OFF Change between L-N on a single phase test socket of 3-phase adapter is
disabled.
CHG-ON Change between L-N on a single phase test socket of 3-phase adapter is
enabled.
Test circuit and measurement procedure for primary leakage current
measurement