Benning IT 101 Bedienungsanleitung Seite 25

During insulation measurements dangerous high voltages
might occur on the test probe tips of the BENNING IT 101. Bear
in mind that these dangerous voltages can also appear on bare
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metal parts of the appliance which is being tested. Do not touch
the test tips when the rotary switch J is set to 50 V, 100 V,
250 V, 500 V or 1000 V.
- Make sure that the circuit or test object is free of voltage.
- Select the desired function (MΩ) 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 black 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.
- With a voltage of more than 30 V AC/ DC, a flashing warning symbol  R
additionally gives a warning of an external voltage being applied and the
insulating resistance measurement is stopped. Switch the switching circuit
off and repeat the measurement.
- Press the TEST key 8 to start the measurement.
- Press the blue key 3 to display the insulating resistance or the leakage
current.
- In order to measure the insulating resistance continuously, first press the
LOCK key 6 and then the TEST key 8 . The value is measured continu-
ously until the TEST key 8 or LOCK key 6 is pressed again.
Before removing the measuring leads, release the TEST key 8
and wait until the voltage applied has dropped to 0 V. Please
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bear in mind that internal energy storages of the test sample
thus are discharged via the measuring instrument.
- Resistance values higher than the measuring range are shown on the
display 2 with ">" P.
See figure 5:
8.4.1 COMPARE function (comparative function)
- The BENNING IT 101 insulating resistance measuring instrument is pro-
vided with 12 stored limiting values:
100 kΩ, 200 kΩ, 500 kΩ, 1 MΩ, 2 MΩ, 5 MΩ, 10 MΩ, 20 MΩ, 50 MΩ,
100 MΩ, 200 MΩ and 500 MΩ.
- Before measurement, press the COMP key 4 to select the limiting value. In
comparative mode, the "COMPARE" symbol J is shown and the selected
limiting value is indicated at the bottom right of the display 2 . The com-
parative function allows a direct check of whether the values fall below the
limiting values.
- The green LED of the PASS indicator 7 lights, if the measured value
exceeds the comparative value (resistance value).
- Press the COMP key 4 to select and activate the limiting value.
- Press the COMP key 4 for more than 2 seconds to deactivate the com-
parative function.
8.5 Polarization index (PI) and dielectric absorption rate (DAR)
- Make sure that the circuit or test object is free of voltage.
- Select the desired function (MΩ) with the rotary switch J.
- To determine the polarization index (PI), press the LOCK key 6 (PI/DAR)
for more than 2 seconds. The "PI" symbol L is shown on the display 2 .
By pressing the key again, it is possible to choose between measuring the
dielectric absorption rate (DAR) and measuring the polarization index (PI).
The selected (PI L or DAR K) measurement is shown on the display 2 .
- The black safety measuring lead has to be connected to the COM jack M
on the BENNING IT 101.
- The black 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.
- With a voltage of more than 30 V AC/ DC, a flashing warning symbol  R
additionally gives a warning of an external voltage being applied and the
measurement is stopped. Switch the switching circuit off and repeat the
measurement.
- The measurement can be started and interrupted by means of the TEST
key 8 .
- The remaining time required for determining the value can be determined
by means of the blue key 3 .
- If the measured value exceeds the measuring range, the error message
"Err" is shown on the display.
02/ 2011
Insulating resistance measurement (symbolic)
BENNING IT 101
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