HT instruments SPEED418 - Manual (Page 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
R C D
0°
18mA
> 3 0 0 m s
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
R C D
0°
27mA
2 7 m s
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
9.
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.
5.
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.