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Benning IT 101 Manual

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02/ 2011
BENNING IT 101
18
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: Voltage measurement with AUTO SENSE function
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 „ “ H is shown on the display
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: Resistance and low-resistance measurement
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.
… 24 …


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