Operation Manual

68 GMC-I Messtechnik GmbH
Function Test with Line Voltage
The device under test can be subjected to a function test with line
voltage via the integrated test socket.
The function test includes the following measurements:
– Voltage U-LN between the L and N conductors
– Load current I
L
– Active power P
– Apparent power S (calculated)
– Power factor PF (cos calculated, display > 10 W)
– Electrical energy E
– Frequency f (line frequency)
Power factor is calculated from active power and apparent power.
Power factor corresponds to cos for sinusoidal quantities (line
voltage and load current).
Prerequisites
• The function test may only be performed after the DUT has
successfully passed the safety test, i.e. after all safety mea-
surements have been executed and passed.
• The device under test must be connected to the test socket.
If no DUT has been connected, momentary line voltage and
line frequency are measured if the test system is connected to
the mains.
• No short-circuits may exist at the DUT.
Attention!
!
Starting the Function Test
For reasons of safety, the device under test must be
switched off before the function test is started. This
precaution prevents inadvertent start-up of a device under
test 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, devices under test
must be turned off with their own switch – especially
devices with relatively high inductivity.
Sequence
Ð Select the test: Function softkey.
Ð Connect the DUT to the test socket.
Ð Start the test: Press the ONSTART key.
Ð All measured values are displayed.
Ð End the test: Press the ONSTART key.