Gossen MetraWatt SECULIFE ST PRO, Manual, Page: 50 / 114

50 GMC-I Messtechnik GmbH
Differential Current Measurement
–
Differential measurement type
– DUT mains plug to test socket
– APPs to APP sockets
– Test probe P1 to P1 terminals
Schematic Diagram
The device under test (PC1) is operated with mains power.
Differential current which flows via the two mains conductors is
measured (current clamp measurement concept). The measure-
ments must be performed with mains plug polarity in both direc-
tions. Polarity is reversed with the
NL/LN key.
Accessible conductive parts which are not connected to the
housing must be contacted with test probe P1.
If the DUT includes terminals for applied parts, they must be con-
nected to the test instrument’s APP sockets. These are short-cir-
cuited in the test instrument and connected to the terminal for test
probe P1.
Wiring Diagram
Alternative Measuring Method (equivalent leakage current)
–
Alternative Measurement Type (P1)
– DUT mains plug connected to the test socket
– APPs to APP sockets
– Test probe P1 to P1 terminals
Schematic Diagram
After activating test voltage, leakage current is measured between
short-circuited mains conductors L and N (DUT mains plug) and
accessible conductive parts (probe contact, test probe P1) which
are not connected to the housing .
If the DUT includes terminals for applied parts, they must be con-
nected to the test instrument’s APP sockets. These are short-cir-
cuited in the test instrument and connected to the terminal for test
probe P1 and the protective conductor terminal at the DUT.
Wiring Diagram