User Manual

GMC-I Messtechnik GmbH 51
8.11 Function Test – P
P
Single measurements, rotary switch level: green
Switch Position
Measuring Functions Measurement
Type,
With Mains 
to Test Socket
P Function test at the test socket
Selection of 
polarity for mains
vol
tage
I Curr
ent between L and N
U V
oltage between L and N
f F
requency
P Active power
S Appar
ent power
PF Po
wer factor
Schematic Diagram
Wiring Diagram
Setting Measuring Parameters for P
Measuring Parameter Meaning
Polarity
LN Phase L – neutral conductor N
NL Neutral conductor N – phase L
The following connection types are possible:
• Test socket
• CEE adapter (only for connection via 
single-phase CEE or “caravan socket”)
• AT3 adapter (AT3-I I I E, AT3-I IS, AT3-I IS32)
• AT16DI/AT32DI
Note
These or similar adapters can be used for the function test
(initial start-up of the DUT), but measurement of apparent
and active power, power factor and current consumption is
only possible when the DUT is directly connected to the test
socket or via the CEE adapter (single-phase CEE socket
only).
The device under test can be subjected to a function test with
mains voltage via the integrated test socket.
The test socket is tested for short-cir
cuiting before switching to
line voltage (a statement resulting from the short-circuit test can
only be made regarding the DUT itself when a single-phase DUT
is being tested).
In addition to testing with the selector switch in the function test
position
, a function test can also be performed immediately after
safety testing has been passed in accordance with the selected
standard (not possible for protection class III devices).
Test Sequence
Attention!
!
The function test may only be performed after the DUT
has successfully passed the safety test.
Attention!
!
Refer to the safety precautions on page 5 with regard to
switching power consumers.
Attention!
!

Starting the Function Test
For reasons of safety, the device under test must be
switched off
before the function test is started. This pre-
caution prevents inadvertent start-up of a DUT which
may represent a hazard during operation, e.g. a circular
saw or a disc grinder. 

Ending the Function Test
After completion of the function test, DUTs must be
turned
off with their own switch – especially devices with
relatively high inductivity.
➭ Set the rotary switch to the P position.
➭ Co
nnect the DUT’s mains plug to the test instrument’s test
socket.
➭ S
tart the test: press the START/STOP key. 

➭ A
cknowledge the warning which indicates that line
voltage will be connected to the test socket.

➭
The measured values are displayed. The measured
value recording symbol shown at the right appears.
Each time th
is key is pressed, the currently displayed
measured value is saved to the buffer.
➭ S
top the test: press the START/STOP key. 
The save symbol appears (floppy disk showing the
number of measured values stored to buffer memory)
and pr
ompts you to save the measured values to an ID
number.
➭ Press the ESC key in order to discard the measured
values stored to buffer memory and acknowledge by
pressing the key shown at the right.