82
Method and definitions:
Determination of harmonics: Cooley-Tukey FFT algorithm on 16 bits
Sampling frequency: 256 times the frequency of the fundamental
Filtering window: rectangular, 4 periods
THD-F: Total distortion referred to the fundamental of the signal.
THD-R: Total distortion referred to the RMS value of the signal (also called DF: distortion factor).
THD-F =
H
1
H
n
²
n=50
n=2
√ Σ
THD-R =
R[RMS]
H
n
²
n=50
n=2
√ Σ
8.3. vARIAtIons In tHE RAnGE of UsE
8.3.1. voltAGE MEAsUREMEnt
Quantities of influence
Limits of the range of use
Variation of the measurement
Typical
Maximum
Temperature
-10 … + 55 °C
1 %/10 °C ± 1 ct
2 %/10 °C + 2 ct
Relative humidity
10 … 85 % RH at 45°C
2 %
3 % + 2 ct
Supply voltage
8.4 … 10 V
0.1% or 1 ct
0.5% + 2 ct
Frequency (except in M
W
setting)
15.8 … 450 Hz
0,5%
4,5 % + 1 ct
Frequency (in M
W
setting)
15.8 … 65 Hz
4%
1% + 1 ct
Series mode rejection in AC
0 … 500 V
ac
50 dB
40 dB
50/60Hz series mode rejection in DC
Common mode rejection in 50/60Hz AC
8.3.2. InsUlAtIon MEAsUREMEnt
Quantities of influence
Limits of the range of use
Variation of the measurement
Typical
Maximum
Temperature
-10 … + 55 °C
1 %/10 °C ± 1 ct
2 %/10 °C + 2 ct
Relative humidity
10 … 85 % RH at 45°C
2 %
3 % + 2 ct
Supply voltage
8.4 … 10 V
0.25% or 2 ct
2% + 2 ct
50/60Hz AC voltage superposed on the
test voltage (U
N
)
Ranges 50 v and 100 v
R
≤
100 M
W
: 2 V
R > 100 M
W
: 0,7 V
1%
5% + 2 ct
Ranges 250 v and 500 v
R
≤
100 M
W
: 6 V
R > 100 M
W
: 2 V
Ranges 500 v and 1000 v
R
≤
100 M
W
: 10 V
R > 100 M
W
: 3 V
Capacitance in parallel on the resistance
to be measured
0 … 5 µF @ 1 mA
0 … 2 µF @ 2000 M
W
1%
1%
1% + 1 ct
10% + 5 ct
Summary of Contents for C.A 6116
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