Ht-instruments SPEED418 Bedienungsanleitung PDF herunterladen (Seite 31)

400 Series

EN - 30

CAUTION

If message “Measuring…” appears on the display, the instrument is

performing measurement. During this whole stage, do not disconnect the

test leads of the instrument from the mains.

6. According to standard EN61008, the test for selective RCDs requires an interval of 60

seconds between the tests. The mode is therefore unavailable for selective RCDs, both

of A and of AC type.

7. While performing the test,

the instrument supplies an

increasing leakage voltage

and displays a screen similar

to the one reported here to

the side

RCD

0°

18mA

> 300ms

FRQ=50.0Hz Ut=1.4V

VP-N=228V VP-Pe=228V

0° or 180° type current

Test current

the RCD under test did not trip at the

displayed test current

Measuring...

30mA 50V

Func IdN RCD UL

8. When the RCD trips and

separates the circuit, if the

tripping time and current is

within the limits reported in

Tab. 5, the instrument gives

a double acoustic signal

which signals the positive

result of the test and then

displays a screen similar to

the one reported here to the

side

RCD

0°

27mA

27ms

FRQ=50.0Hz Ut=1.4V

VP-N=228V VP-Pe=228V

0° or 180° type current

Tripping current of the RCD

Tripping time at the tripping current

of the RCD under test

RCD OK

30mA 50V

Func IdN RCD UL

The results displayed can be saved by pressing the SAVE key twice or the

SAVE key and, subsequently, the ENTER key (§ 9.1)

6.4.5. RA mode

In RA mode, the contact voltage and the total earth resistance are measured by supplying

a leakage voltage equal to half the value of the set nominal current in order to prevent the

RCD from tripping.

Press the GO/STOP key on the instrument or the START key on remote

probe. The instrument will start the measurement.

CAUTION

If message “Measuring…” appears on the display, the instrument is

performing measurement. During this whole stage, do not disconnect the

test leads of the instrument from the mains.

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