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9.9 Resistance to earth (BENNING IT 120 B only)
Measuring range according to EN61557-5: 0.04 up to 1999
Measuringrange(Ω) Resolution () Accuracy
0.00 (0.02) ÷ 19.99 0.01
± (2 % of reading +3 digits)20.0 ÷ 99.9 0.1
100 ÷ 1999 1
Auxiliary earth electrode resistance R
Cmax
100×R
E
or 50 k (lower value)
Probe resistance R
Pmax
100×R
E
or 50 k (lower value)
Additional errors at R
Cmax
or R
Pmax
± (10 % of reading + 10 digits)
Additional errors at 3 V noise voltage (50 Hz) ± (5 % of reading + 10 digits)
Open circuit voltage < 45 V
AC
Short-circuit current < 20 mA
Frequency 125 Hz
Automatic measurement of auxiliary electrode resistance and probe resistance.
Automatic measurement of voltage noise.
9.10 TRUE RMS CURRENT (BENNING IT 120 B only)
Measuring range (A) Resolution (A) Accuracy
0.0 ÷ 99.9 mA 0.1 mA ± (5 % of reading +3 digits)
100 ÷ 999 mA 1 mA
± (5 % of reading)
1.00 ÷ 19.99 A 0.01 A
Maximum continuous input current 20 mA
=
^ 20 A meas. current!
Additional current clamp error has to be considered.
9.11 Illumination (BENNING IT 120 B only)
9.11.1 Illumination (BENNING Luxmeter type B)
Measuring range (lux) Resolution (lux) Accuracy
0.01 ÷ 19.99 0.01
± (5 % of reading +2 digits)
20.0 ÷ 199.9 0.1
200 ÷ 1999 1
2.00 ÷ 19.99 k 10
Measurement principle silicon photodiode with V(λ)lter
Spectral response error 3.8 % according to CIE curve
Cosine error 2.5 % up to an incident angle of +/- 85 deg.
Overall accuracy matched to DIN 5032 class B standard
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