Omicron CMC 356, User Manual

Page: 85 / 142

Technical Data
85
6.10.7.1 Accuracy of Frequency Measurement
The permitted input frequency range depends on the specified sampling
rate:
Table 6-43:
Sampling rate and input
frequency range
Figure 6-32:
Accuracy of frequency
measurement as function
of the voltage signal
Conditions: sampling rate 9.48 kHz, fin=20 Hz ... 1 kHz
Note: Through recursive averaging, the measurement uncertainty can be
further reduced.
Sampling rate Input frequency range
28.44 kHz 49 Hz ... 3400 Hz
9.48 kHz 17 Hz ... 1100 Hz
3.16 kHz 5 Hz ... 380 Hz
Uncertainty in Frequency Measurement
-0,05
-0,04
-0,03
-0,02
-0,01
0
0,01
0,02
0,03
0,04
0,05
1 10 100
Voltage signal in % of full range
Frequeny Error / Hz
Average
Avg+3Sigmamax
Avg-3Sigmamax
Accuracy of frequency measurement
as function of the voltage signal
F
requen
cy
err
or
in
%
Voltage signal in % of full range