Gossen MetraWatt 702 Instrukcja Użytkownika Pobierz pdf (Strona 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

– 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

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