Benning IT 100 Bedienungsanleitung Seite 18

- The button  can be released when an acoustic signal sounds to
indicate that the measured value is stable. The main display  indicates
the resistance value of the low resistance measurement. The symbol ">20
" appears in the display if the measured value is greater than 20 .
- After completing the measurement, reverse the polarity of the test current
by swapping the red and black measuring cables at the measuring point.
- Repeat the measurement. The measurement result should be the same as
for the first measurement.
- The purpose of the polarity reversal is to detect corroded contacts which
can cause different measurement results in the two measurements.
See Fig. 4:
Attention: The measurement result can be falsified by the

parallel connected impedance of additional working circuits
and by circulating currents!
8.4 Resistance measurement and continuity testing
- Make the circuit or test object voltage free.
- Select the desired function "
- Connect the black safety measuring cable to the negative socket (-) of the
BENNING IT 100.
- Connect the red safety measuring cable to the positive socket (+) of the
BENNING IT 100.
- Connect the safety measuring cables to the measuring point and take the
measurement reading in the display .
- If an external voltage is present at the test prods, its magnitude is shown in
the display . If the magnitude of the external voltage is 30 V AC/ DC or
greater, a flashing warning symbol " " in the display and an acoustic signal
give additional warning that a dangerous external voltage is present. Make
the circuit voltage free and then repeat the measurement.
- The measured resistance value is shown in the display .
- The internal buzzer of the BENNING IT 100 sounds if the resistance
value is less than 30 . The buzzer can be switched on and off with the
button .
- Resistance values greater than 2000  are indicated in the display  as
"> 2000 ".
See Fig. 5:
Attention: The measurement result can be falsified by the

parallel connected impedance of additional working circuits
and by circulating currents!
8.5 Voltage measurements
- Select the desired function "V
- Connect the black safety measuring cable to the negative socket (-) of the
BENNING IT 100.
- Connect the red safety measuring cable to the positive socket (+) of the
BENNING IT 100.
- Connect the safety measuring cables to the measuring point and take the
measurement reading on the display .
Voltages greater than 1000 V are shown on the display as > 1000 V.
A flashing warning symbol " " appears in the display  if the voltage rea-
ding is 30 V AC/ DC or greater.
The BENNING IT 100 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 Figs. 6a/ 6b:
8.6 Checking the battery capacity
- Disconnect the safety measuring cables from the BENNING IT 100.
- Select the desired function "
- The battery test takes place automatically with connection of a simulated load.
11/ 2004
Low voltage resistance measurement
" with the rotary switch .
Resistance measurement and continuity testing
" with the rotary switch .

Direct and alternating voltage measurements
" with the rotary switch .
BENNING IT 100

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