Operation Manual

MI 3310 / MI 3310A SigmaGT Measurements
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5.3 Measurements – Single tests for welding machines
Note:
 For testing welding machines the 3-phase operation mode must be enabled and the
SigmaGT must be connected to a METREL 3-Phase adapter (A1322 or A1422).
Refer to 3-phase AktivGT/Machine adapter (A1322/A1422) user manual for detailed
information.
5.3.1 Continuity of the protective circuit
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.
The instrument measures:
- the resistance between mains test socket‘s PE terminal / PE terminal (only if test
current of 200 mA is set) and EB/S terminal.
- the resistance between mains test socket‘s PE terminal on 3-phase adapter and
EB/S terminal on SigmaGT.
Continuity menu
Test parameters for continuity measurement
OUTPUT Test current [200 mA, 10 A]
LIMIT
Maximum resistance [0.1   0.9 , 1  ]
TIME Measuring time [2 s, 3 s, 5 s, 10 s, 30 s]
Test circuit and measurement procedure for continuity measurement
 For more information refer to chapter Measurements according to IEC/ EN
60974-4, paragraph Continuity of the protective circuit in 3-phase adapter user
manual.