Omicron CMC 356 - Accuracy of Phase Measurement

Technical Data
91
Table 6-51:
Sampling rate
9.48 kHz
3.16 kHz
measurement range
100 mV
6.11.7.3 Accuracy of Phase Measurement
The permitted input frequency range for the fundamental wave depends on
the specified sampling rate:
Table 6-52:
Sampling rate and input
frequency range
Figure 6-32:
Accuracy of phase
measurement as function
of the excitation
Conditions: sampling rate 9.48 kHz, fin = 50 Hz.
Note: Through recursive averaging, the measurement uncertainty can be reduced
further.
Frequency range Accuracy
Typical Guaranteed
fmin ... 100 Hz ± 0.15 % ± 0.4 %
fmin ... 1 kHz ± 0.2 % / - 0.5 % ± 0.8 %
fmin ... 4 kHz
(sampling rate = 9.48 kHz)
+ 0.2 % / - 1.0 % ± 1.5 %
fmin ... 1.4 kHz
(sampling rate = 3.16 kHz)
+ 0.25 % / - 1.0 % ± 2.0 %
Sampling rate Input frequency range
28.44 kHz 100 Hz ... 3200 Hz
9.48 kHz 30 Hz ... 1000 Hz
3.16 kHz 10 Hz ... 350 Hz
Unce rtainty phase m e asure m ent as a function of Excitation
(fs =9.48 kHz, fin=50 Hz)
-2.5
-2
-1.5
-1
-0.5
0
0.5
1
1.5
2
2.5
110100
Excitation / %
Phase Error / °
Average
Avg+3Sigmamax
A v g- 3Sig mamax
Accuracy of phase measurement
as function of the excitaiton
Phase error in °
Excitation in %