GMC-I Messtechnik GmbH 41
Alternative Measuring Method (equivalent leakage current)
– Measurement type alternative P1
– DUT mains plug to test socket
– 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). The TRMS, the AC
or the DC component of the current is measured.
Wiring Diagram
Direct Measuring Method for Permanently Installed DUTs
– Measurement type permanent connection P1
– Test probe P1 to P1 terminals
Schematic Diagram
The DUT is operated with line voltage from a permanent installa-
tion. Leakage current is measured between the protective con-
ductor at the mains and the output sockets for safety extra-low
voltage at the DUT, one after the other, with the help of the test
probe. Furthermore, accessible, conductive parts which are not
connected to the housing must also be contacted.
Wiring Diagram
Alternative measuring method with 2-pole measurement (P1–P2)
– Alternative measurement type (P1 - P2)
– Test probe P1 to P1 terminals
– Test probe P2 to P2 terminals
Schematic Diagram
Touch current is measured between external conductive parts
which can be contacted with test probe P2 and are not connected
to the housing, and the housing with test probe P1.
Wiring Diagram
Setting Measuring Parameters for IT
Measuring
Parameter
Meaning
Measurement
Type
Suitable for
DUT Connection via
Direct P1 Direct measuring method Test socket, AT3 adapter
(AT3-IIIE, AT3-IIS, AT3-IIS32),
AT16DI/AT32DI
Differential P1 Differential current measurement Test socket
Alternative P1 Equivalent leakage current
method
Test socket, AT3 adapter
(AT3-IIIE, AT3-IIS, AT3-IIS32),
AT16DI/AT32DI, VL2E
Permanently
connected P1
Permanently installed DUT Permanent connection
Alternative P1–P2
Equivalent leakage current
method with SECUTEST PRO or
feature H01
No connection, PC3:
2-pole measurement between
test probes 1 and 2 (see section
6.6)
Polarity – for direct and differential measurement type only
L/N or N/L Selection of polarity for mains voltage to the test socket
The U (setpoint) and frequency (setpoint) measuring parameters for the “Alterna-
tive” measurement type are no longer included as of firmware version 1.7.0.
These parameters apply to individual measurements as well as test sequences
and have to be entered in SETUP (see section section 6.2).
U(set) – for measurement type alternative P1 only
110 V, 115 V,
220 V, 230 V, 240 V
Selection of a line voltage for synthetic test voltage
Frequency(set) – for measurement type alternative P1 only
48 Hz ... 400 Hz Selection of a line frequency for synthetic test voltage
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