Benning IT 101, Руководство по эксплуатации

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03/ 2009
BENNING IT 101

19
- 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
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: Insulating resistance measurement (symbolic)
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.
See figure 6: Measuring the polarization index (PI) / dielectric absorp-
tion rate (DAR)
Polarization index (PI) = R10-Min/ R1-Min
with: R10-Min = measured insulating resistance after 10 minutes
R1-Min = measured insulating resistance after 1 minute
Dielectric absorption rate (DAR) = R1-Min/ R30-Sec
with: R1-Min = measured insulating resistance after 1 minute
R30-Sec = measured insulating resistance after 30 seconds