Benning IT 101 Notice D'emploi page 24

8.2 Voltage measurement with AUTO SENSE function (automatic AC/ DC
detection)
- Disconnect the switchable probe tip from the BENNING IT 101.
- Select the desired function (V) with the rotary switch J.
- The black safety measuring lead has to be connected to the COM jack M
on the BENNING IT 101.
- The red measuring lead has to be connected to the jack for V, insulation L
on the BENNING IT 101.
- The safety measuring lead has to be connected to the measuring point.
Read the measured value on the display 2 .
- Voltages higher than 660 V AC/ DC are shown on the display as ">660 V
AC/DC".
- A flashing warning symbol  R appears on the display if the voltage
reading is 30 V AC/ DC or higher.
The BENNING IT 101 indicates either a DC (direct) voltage or
an AC (alternating) voltage. If the measured voltage has a DC
component and an AC component, only the component which

has the greater magnitude is indicated. The measured value for
AC (alternating) voltages is derived by mean value rectification
and displayed as r.m.s. value.
See figure 3:
8.2.1 Voltage measurement with low-pass filter (LPF)
- The BENNING IT 101 is equipped with an integrated low-pass filter with a
limiting frequency of 1 kHz.
- The low-pass filter can be activated by means of the key (blue) 3 of the
BENNING IT 101 (press the key once).
- If the filter is activated, the "LPF" F symbol is indicated at the same time
on the display 2 .
8.3 Resistance and low-resistance measurements
- Make sure that the circuit or test object is free of voltage.
- Select the desired function (Ω) with the rotary switch J.
- The black safety measuring lead has to be connected to the COM jack M
on the BENNING IT 101.
- The red measuring lead has to be connected to the Ω jack K on the
BENNING IT 101.
- To carry out a compensation (null balance) of the measuring lead resist-
ance, connect (short-circuit) the measuring leads and press the blue key 3 .
The null balance is carried out as soon as „
2 .
- Connect the safety measuring leads with the measuring point, press
the TEST key 8 and read the measured value on the display 2 of the
BENNING IT 101.
- With a voltage of more than 2 V AC/ DC, a flashing warning symbol  R
additionally gives a warning of an external voltage being applied and the
resistance measurement is stopped. Switch the switching circuit off and
repeat the measurement.
- The measured resistance value is shown on the display 2 . Resistances
higher than 40 kΩ are shown on the display with ">40kΩ".
- In order to measure the resistance value continuously, press the LOCK key
6 and then the TEST key 8 . The value is measured continuously until the
TEST key 8 or LOCK key 6 is pressed again.
See figure 4:
8.4 Insulating resistance measurement
Do not exceed the maximum permitted voltage with respect to

earth potential! Electric danger!
The highest voltage which may be applied to the jacks,
- COM socket M
- jack for V, Insulation L
of the BENNING IT 101 against ground, is 600 V. When measuring, avoid arcs
occurring for a longer period of time between the test tips/ measuring points,
these might lead to unit faults.
02/ 2011
Voltage measurement with AUTO SENSE function
Resistance and low-resistance measurement
BENNING IT 101
" H is shown on the display

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