
GMC-I Messtechnik GmbH
47
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
Note
The currently selected
single fault
and the
test condition
are
displayed on the initial page. In order to change them,
they have to be
selected and
set via the measuring
parameters menu.
Single fault exception: This can be set via the
SFC
direct
selection key.
The measurements have to be conducted under all fault condi-
tions. Selection is made in the measuring parameters menu under
Single Fault
.
Direct Selection – Setting Polarity
– for Direct and Differential Only
Prerequisites for Touch Current Measurement
•
Visual inspection has been passed.
•
For protection class I devices
Protective conductor resistance testing has been passed.
•
Insulation resistance testing has been passed.
Measuring
Parameter
Meaning
Measurement Type
Suitable for
DUT Connection via
Direct P1
Direct measurement of touch
current between PE (mains) and
probe P1
Test socket, AT3 adapter
(AT3-IIIE, AT3-IIS, AT3-IIS32),
AT16DI/AT32DI
Differential P1
Measurement of touch current in
accordance with the differential
current measuring method L/N
(TS), exposed parts are grounded
via probe P1 (via 1 k
Ω
)
Test socket
Alternative P1
Measurement of touch current
with equivalent source between
probe P1 and L/N at the test
socket (short-circuited)
Test socket, AT3 adapter
(AT3-IIIE, AT3-IIS, AT3-IIS32),
AT16DI/AT32DI, VL2E
Perm. conn. P1
Direct measurement of touch
current between PE (mains) and
probe P1
Permanent connection
Alternative P1–P2
Measurement of touch current
with equivalent source between
probe P1 and probe P2
No connection, PC3:
2-pole measurement between
test probes 1 and 2 (see section
6.6)
TC – test conditions – only for measurement types direct P1 and permanent
connection P1
None
APP > PE: Connect APP to PE –
all
APP sockets are connected to PE potential when this
option is activated.
Single fault (SFC) – only with measurement type direct P1
Normal state / N interrupted / PE interrupted
Polarity
With direct and differential mea-
surement type only
L/N or N/L
Selection of polarity for mains voltage to the test socket
Measuring
Parameter
Meaning
Measurement Type
L/N or N/L
Selection of polarity for mains voltage to the test socket
Содержание SECULIFE ST PRO
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