Benning IT 105 CH Operating Manual page 28

AUTO start (F4):
With the AUTO start function being enabled, the continuity test will be started automatically if the resis-
tance value applied to the measuring probes is < 20 kΩ. The function remains stored even after switching
off the tester.
- Connect the measuring leads to the BENNING IT 105 as shown in figure 2 and apply them to the test
object.
- The continuity test is started automatically if the AUTO start function has been enabled via the function
key F4 3 . Alternatively, press and hold the TEST key 4 to start the continuity test.
- In order to reverse the polarity of the testing current, repeat the measurement with inverted measuring
leads at the test object.
- The resistance value is shown on the main display K and the testing voltage is shown on the sec-
ondary display J.
8.4 Insulating resistance (R

Measurements of the insulating resistance must be carried out at idle system parts only.
If a voltage of > 30 V AC/DC is applied to the test object, a flashing warning symbol
a pulsating acoustic signal will warn you of an external voltage being applied. The external

voltage is indicated on the digital display 2 and measurement will be blocked. Make sure
that the circuit is free of voltage and repeat the measurement.
- Select the desired function R
- 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 which will be stored until they are changed
for the next time:
F1
Buzzer (F1):
With the buzzer being enabled, a pulsating acoustic signal will be emitted at a measured value of < 1 MΩ.
Lock (F2):
The lock function enables a continuous measurement of the insulating resistance without having to press
and hold the TEST key 4 again. For continuous measurement, first press the function key F2 3 and then
the TEST key 4 . The digital display 2 shows the LOCK symbol
ously applied to the measuring probes. The lock function can be stopped by pressing the function key F2
3 or the TEST key 4 .
- Connect the measuring leads to the BENNING IT 105 as shown in figure 2 and apply them to the test
object.
- Press and hold the TEST key 4 to start an insulating resistance measurement.
- The resistance value is shown on the main display K and the testing voltage is shown on the sec-
ondary display J.
8.5 Loop impedance (Z
Measurement requires correct connection of the mains voltage to the BENNING IT 105 as

shown in figures 4, 5 or 6. The mains voltage indicator must light permanently:
If the mains voltage indicator flashes, check the measuring leads for correct connection or the system part
for correct voltage potentials.
03/ 2020
)
ISO
(250 V D), 500 V C or 1000 V B) with the rotary switch 1 .
ISO
F2
) and line impedance (Z
S
BENNING IT 105 CH
F3
–
B and the testing voltage is continu-
)
I

 and
F4
–
22