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Benning IT 101 Manual

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02/ 2011
BENNING IT 101
17
AC conversion:
The AC conversion is capacity-coupled (AC-coupled), TRUE RMS behaviour,
calibrated against a sinusoidal signal. In case of non-sinusoidal curves the
display value becomes less precise. Thus an additional error results for the
following crest factors:
Crest factor from 1.4 to 2.0 additional errors + 1.0 %
Crest factor from 2.0 to 2.5 additional errors + 2.5 %
Crest factor from 2.5 to 3.0 additional errors + 4.0 %
7.2 Insulating resistance measuring ranges
(switch setting MΩ, 50 V/ 100 V/ 250 V/ 500 V/ 1000 V)
Measuring range Resolution Accuracy
4 MΩ 0.001 MΩ ± (1.5 % of the measured value + 5 digits)
40 MΩ 0.01 MΩ ± (1.5 % of the measured value + 5 digits)
400 MΩ 0.1 MΩ ± (3.0 % of the measured value + 5 digits)
4000 MΩ 1 MΩ ± (3.0 % of the measured value + 5 digits)
4.1 GΩ ... 20 GΩ 0.1 GΩ ± (10 % of the measured value + 3 digits)
Minimum / maximum resistance depending on the testing voltage:
Testing voltage Min. resistance (at 1 mA) Max. resistance
50 V 50 kΩ 50 MΩ
100 V 100 kΩ 100 MΩ
250 V 250 kΩ 250 MΩ
500 V 500 kΩ 500 MΩ
1000 V 1 MΩ 20 GΩ
Accuracy of testing voltage: - 0 %, + 20 %
Short-circuit current: 1 mA (nominal)
Automatic discharge function: discharging time < 1 sec. for C < 1 µF
Max. capacitive load: operational for loads of up to 1 µF
Detection of a connected electric circuit: if > 30 V AC/ DC, then
7.3
Resistance measuring range (Low-resistance range) (switch setting Ω)
Measuring range Resolution Accuracy
40 Ω 0.01 Ω ± (1.5 % of the measured value + 5 digits)*
400 Ω 0.1 Ω ± (1.5 % of the measured value + 3 digits)
4000 Ω 1 Ω ± (1.5 % of the measured value + 3 digits)
40 kΩ 0.01 kΩ ± (1.5 % of the measured value + 3 digits)
* < 1 Ω additional 3 digits
Test voltages: > 4 V and 8 V
Short-circuit current: > 200 mA
Detection of a connected electric circuit: if > 2 V AC/ DC, then
8. Measuring with the BENNING IT 101
8.1 Preparations for measuring
Operate and store the BENNING IT 101 only at the specified storage and oper-
ating temperatures. Avoid continuous insulation.
- Check the nominal voltages and nominal current on the safety measuring
leads. The nominal voltage and current ratings of the safety measuring
leads included in the scope of delivery correspond to the ratings of the
BENNING IT 101.
- Check the insulation of the safety measuring leads. Dispose of the safety
measuring leads immediately if the insulation is damaged.
- Check the safety measuring leads for continuity. If the conductor in the
safety measuring lead is interrupted, the safety measuring leads must be
dispose of immediately.
- Before a different function is selected by means of the rotary switch J, the
safety measuring leads must be disconnected from the measuring point.
- Strong sources of interference in the vicinity of the BENNING IT 101 might
lead to unstable readings and measuring errors.
… 23 …


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