Page 38 of 82
Date: 27.01.06
6.10
Signal processing
6.10.1
Measurement rate / Cut-off frequency / Filter
The A/D converter digitizes every single signal at a user-definable rate. The filter
cut-off frequencies can be set to 5, 10, 25, 50, 100, 200 and 400 Hz.
6.10.2
Averaging
The large signal amplification required for small signals inevitably means a higher
noise component. In order to increase the measurement accuracy in this case,
the user can select to use averaging as part of signal conditioning. This method
performs arithmetic averaging over a number of measured values. Although this
does reduce the measurement rate, the measurement resolution is increased
dramatically. The averaging period, or here the number of values used to find the
average, can be set by the user in the range 1 to 6500. Thus the maximum time
for a transmitted measurement value can equal 6.5 seconds e.g. when the
number of values for averaging is set to 6500.
