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Gossen Metrawatt SECULIFE ST HV Manual

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34 GMC-I Messtechnik GmbH
14 Function Test
The device under test can be subjected
to a function test with line voltage via the
integrated test socket.
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
safety class III devices).
Attention!
!
The function test may only be performed after the DUT has
successfully passed the safety test.
Note
+
Each time line voltage is applied to the test socket, phase con-
ductor L and neutral conductor N are reversed, assuming that
“polarity reversal = X” is selected in the I leakage switch setting.
Note
+
The function test is only possible if the device under test has
been connected to the test socket (21).
Measurements
The function test includes the following measurements:
–Voltage U
LN
between the L and N conductors
– Residual current ΔI
(corresponds to fault current between L and N)
– Load current I
a
– Active power P
– Apparent power AP (calculated)
– Power factor PF (cos ϕ calculated, display > 10 W)
– Electrical energy W
– On-time t for U
LN
at socket (21)
The following values are also displayed in all test sequences in switch po-
sition AUTO after the function test has been completed:
– Maximum residual current ΔI
max
– Maximum load current I
Lmax
– Maximum active power P
max
Power factor is calculated from active power and apparent power.
Power factor corresponds to cos ϕ for sinusoidal quantities (line voltage
and load current).
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.
Function
Test
… 34 …


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