User Manual

22 GMC-I Messtechnik GmbH
8.4 Insulation Resistance Measurement – RISO
Application, Definition, Measuring Method
Protection Class I Devices
Figure 1/7: Insulation resistance is measured between short-cir-
cuited mains terminals (L-N) and protective conductor PE.
Protection Class II Devices with Exposed Conductive Parts
Figure 2/7: Insulation resistance is measured between short-cir-
cuited mains terminals (L-N) and external conductive parts which
can be contacted with test probe P1 and are not connected to the
housing.
Protection Class I Devices with Exposed Conductive Parts
Figure 3/7: Insulation resistance is measured between short-cir-
cuited mains terminals (L-N) and external conductive parts which
can be contacted with test probe P1 and are not connected to the
housing, as well as protective conductor terminal PE at the hous-
ing.
Protection Class I Devices with
Terminals for Application Parts
Figure 4/7: Insulation resistance is measured between protective
conductor terminal PE and external, short-circuited application
parts which can be contacted with test probe P1.
Protection Class II Devices with Outputs for
Safety Extra-Low Voltage
Figure 5/7: Insulation resistance is measured between short-cir-
cuited mains terminals (L-N) and the short-circuited safety extra-
low voltage outputs which are contacted with probe P1.
Protection Class I Devices with Outputs for Safety Extra-Low
Voltage and Exposed Conductive Parts
Figure 6/7: Insulation resistance is measured successively
between short-circuited mains terminals (L-N) and the safety
extra-low voltage outputs which can be contacted with test probe
P1, as well as external conductive parts which are not connected
to the housing.
Protection Class I and Safety Extra-Low Voltage Terminals
Figure 7/7: Insulation resistance is measured between short-cir-
cuited mains and PE terminals, and the safety extra-low voltage
outputs which must be contacted one after the other with probe
P1.
Switch
Setting
Meas.
Variant
Measuring functions
Single measurements, rotary switch level: green
Measurements at voltage-free objects
R
ISO
PC1
PC2
R
INS
Insulation resistance
U
INS
Tes t voltage
R
ISO