Gossen MetraWatt 702 - Manual (Page 24)

24 GOSSEN METRAWATT GMBH
10 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,
or with the Function parameter in the MENU position (feature F01 only), 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
conductor L and neutral conductor N are automatically reversed,
if the “mains polarity reversal” function has been activated (= x) in
the I leakage selector switch position.
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
L
– Active power P
– Apparent power S (calculated)
– Power factor PF (cos
ϕ calculated, display > 10 W)
– Electrical energy W
– On-time t for U
L–N
at the socket (21)
The following values are also displayed for all selector switch positions
except MENU, 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