03/ 2020
BENNING IT 105 CH
25
(F3):
RECALL function; the measured values of the last AUTO measurement are shown on the digital display
each time a key is pressed.
½ x I∆n at 0°
▼
½ x I∆n at 180°
▼
I∆n at 0°
▼
I∆n at 180°
▼
5 x I∆n at 0°
▼
5 x I∆n at 180°
▼
Start of AUTO
measurement
I
∆
N nominal fault current (F4):
Press the function key F4 to select the nominal fault current:
Available nominal fault currents (sinusoidal testing current) :
10 mA
►
30 mA
►
100 mA
- Connect the measuring leads to the BENNING IT 105 as shown in figures 4 or 5 and apply them to the
test object.
- Press the TEST key
4
to start the measurement.
- Switch the RCD on again after each tripping until the test sequence is completed.
- Press the function key F4
3
to call the tripping times of the different nominal fault currents on the main
display
K
.
8.6.2 Tripping time RCDt (x½, x1, x5)
- Use the rotary switch
1
to select the multiplier (x½
J
, x1
K
, x5
L
) of the testing current for the desired
function RCDt.
- The symbols of the function keys F1
A
to F4
D
are briefly shown on the digital display
2
. You can
use the function keys F1 to F4
3
to make the following settings:
F1
F2
F3
F4
0° / 180°
–
I
∆
N
0°/ 180° (F1):
0°:
Testing current with positive initial polarity
180°: Testing current with negative initial polarity
RCD type (F2):
sinusoidal test current
pulsating test current
selective (delayed) RCD
For testing selective RCDs, measurement starts after a time delay of 30 seconds.
