User Manual
GMC-I Messtechnik GmbH 29
Protection Class I Devices 
with Terminals for Applied Parts 
– Measurement type PE(TS) - P1 
– DUT mains plug to test socket 
– Test probe P1 to P1 terminals
Schematic Diagram 
Insulation resistance is measured between protective conductor 
terminal PE and external, short-circuited applied parts which can 
be contacted with test probe P1.
Wiring Diagram 
Protection Class I Devices 
with 
Outputs for Safety Extra-Low Voltage
– Measurement type PE(TS) - P1 
– DUT mains plug to test socket 
– Test probe P1 to P1 terminals
Schematic Diagram   
Insulation resistance is measured between the PE terminal and 
the safety extra-low voltage outputs, which must be contacted 
one after the other with probe P1.
Wiring Diagram   
Protection Class I Devices 
with Exposed Conductive Parts 
– Measurement type LN(TS) - P1//PE(TS) 
– DUT mains plug to test socket 
– Test probe P1 to P1 terminals
Schematic Diagram 
Insulation resistance is measured between short-circuited mains 
terminals (L-N) and external conductive parts which can be con-
tacted with test probe P1 and are not connected to the housing, 
as well as protective conductor terminal PE at the housing.
Wiring Diagram 
Setting Measuring Parameters for RISO 
Measuring 
Parameter
Meaning
Measurement Type,
Suitable for 
DUT Connection via
LN(TS)-PE(TS) PC I: Testing is conducted be-
tween short-circuited LN mains 
terminals at the test socket and 
the DUT’s PE terminal
Test socket, EL1, VL2E, 
AT3 adapter (AT3-IIIE, AT3-IIS, 
AT3-I IS32), AT16DI/AT32DI, 
CEE adapter
LN(TS)-P1 Testing is conducted between 
short-circuited LN mains termi-
nals at the test socket and test 
probe P1.
Test socket, VL2E, 
AT3 adapter (AT3-IIIE, AT3-IIS, 
AT3-I IS32), AT16DI/AT32DI
P1 – P2
SECUTEST PRO or feature H01:
2-pole measurement between 
test probes 1 and 2 
(see section 6.6)
No connection (PC3)
PE(mains)-P1
Cable test: Testing is conducted 
between the ground terminal at the 
mains and test probe P1.
Permanent connection
PE(TS)-P1
Testing is conducted between the 
PE terminal at the test socket and 
test probe P1.
Test socket
LN(TS)-P1 // 
PE(TS)
Testing is conducted between 
short-circuited LN mains termi-
nals at the test socket
 and test 
probe P1, including PE at the test 
socket.
Test socket, VL2E, 
AT3 adapter (AT3-IIIE, AT3-IIS, 
AT3-I IS32), AT16DI/AT32DI
UISO(set)
> 50 ... < 500 V Variable test voltage can be entered with the numeric keypad










