YOKOGAWA VZ20X, User Manual

Page: 73 / 158

7-6
IM 77V01B01-01EN 5th Edition: 2023.03.07-00
7.1.9 Moving Average Filter
Set filtering of measured data.
Parameter Name Setting Range Default Explanation
Moving average filter OFF, ON OFF
This toggles the moving average filter
setting between use/non-use.
Number of moving
average cycles
2 to 100 100
Set the number of times in which the
moving average is calculated.
●
Explanation
Moving average is performed on measured values for the preset number of times to
reduce the affect of noise on the measured value readout.
When the number of data to undergo moving average processing has not reached the
preset number of moving average cycles immediately after calculation is started, the
average of the currently acquired data is calculated.
When measured values are in error (range over, burnout, A/D error), the moving
average calculation is initialized, and moving average is restarted from the beginning
when values have returned to normal.
Moving average processing functions in the same way as an FIR low pass filter. The
following block diagram shows how moving average processing is performed when
sampling is performed with the moving average number of times set to "5". In this
example, input is expressed as "X" and output is expressed as "Y". Z
-1 is one sample
delay.
Formula of above block
diagram:
Moving average calculation value
Measured value
Average
Number of moving average cycles
Sampling period
Average
5
] 4 [ ] 3 [ ] 2 [ ] 1 [ ] [
] [
− + − + − + − +
=
n X n X n X n X n X
n Y