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Strong sources of interference in the vicinity of the BENNING IT 105 might lead to unstable readings
and measuring errors.
Before starting the installation tester, always check it as well as all measuring leads and
wires for signs of damage.
8.1.1
Switching the BENNING IT 105 ON/OFF
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Turn the rotary switch 1 from position "OFF" F to the desired measuring function to switch on the
BENNING IT 105.
The BENNING IT 105 switches off automatically after approx. 5 minutes (APO, Auto-Power-Off). It
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switches on again, if the rotary switch 1 is switched on from switch position "OFF".
8.1.2
Testing the battery condition
During switch-on and operation, the BENNING IT 105 performs an automatic battery test. Discharged
batteries are indicated by a battery symbol
I flashes, the batteries have to be replaced by new ones immediately (see section 9.3 "Battery replace-
ment").
8.1.3
Test probe with TEST key
The test probe with integrated TEST key can be used instead of the black 4 mm measuring lead. Thus,
the measuring process can be started via the TEST key 4 of the BENNING IT 105 or via the TEST key
of the test probe.
8.2 Voltage (V), Frequency (Hz), rotary field (phase sequence)
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Select the desired function (V) A with the rotary switch 1 .
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Connect the measuring lead to the BENNING IT 105 as shown in figures 3, 4, 5 or 7 and apply them
to the test object.
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Voltage measurement starts automatically. There is no need to press the TEST key 4 or the function
keys F1 to F4 3 .
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The main display K shows the voltage potential between the black L/L1 5 and the blue N/L3 7 meas-
uring input.
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For alternating voltage (AC), the secondary display J additionally shows the frequency (Hz).
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In a three-phase mains, the phase sequence (rotary field) is indicated additionally. Clockwise phase
sequence (phase 1 before phase 2) is given if the symbol "L1 L2 L3" H is shown and the measuring
inputs are connected to the external conductors (phases) as follows:
Black 5 to L1, green 6 to L2 and blue 7 to L3.
Counter-clockwise phase sequence (phase 2 before phase 1) is indicated by the symbol "L1 L3 L2" H.
8.3 Low-impedance resistance (R
Measurements of the protective conductor resistance must be carried out at idle system
parts only.
The protective conductor resistance measurement might be distorted by impedances con-
nected in parallel of additional operating circuits and by transient currents.
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.
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Select the desired function (R
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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
04/ 2020
I on the LC display 2 . As soon as the battery symbol
) with 200 mA test current
LOW
) E with the rotary switch 1 .
LOW
F2
–
BENNING IT 105
F3
and
F4
AUTO
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