COMBITEST422
EN - 45
6.6.4.
mode
The standard defines the tripping times for RCDs at nominal current. The mode is used
to detect the tripping time at tripping current (which could also be lower than the nominal
current).
5. Press the
GO/STOP
key on the instrument, the
START
key on the remote switch probe or use the AutoStart
feature (see § 5.1.5). The instrument will start the
measurement.
.
R C D
15/10
– 18:04
TT
I
=
- - -
mA
T
= - - - ms Ut = - - - V
FREQ. = 50.00Hz
VL-PE=231V
VL-N=234V
Measuring...
30mA
+
MODE
I
n
Type
Ut
CAUTION
If mess
age “
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. When the RCD trips and breaks the circuit, if the
tripping current and tripping time are within the limits
reported in 12.4, the instrument gives a double acoustic
signal, shows the
“
OK
” message and displays the
screen to the side.
R C D
15/10
– 18:04
TT
I
=
24
mA
T
= 38 ms
Ut = 1 V
FREQ. = 50.00Hz
VL-PE=231V
VL-N=234V
OK
30mA
+
MODE
I
n
Type
Ut
8. Press the
SAVE
key to store the test result in the instrument’s memory (see § 7.1) or
the
ESC/MENU
key to exit the screen without saving and go back to the main
measuring screen.
