GRAPHTEC GL840 - Page 102

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CHAPTER 3 Settings and Measurement
(1)-4 Filter
Selects the range to be measured.
Selection item Description
Off No moving average is calculated.
2 A moving average is calculated 2 times per sampling interval.
5 A moving average is calculated 5 times per sampling interval.
10 A moving average is calculated 10 times per sampling interval.
20 A moving average is calculated 20 times per sampling interval.
40 A moving average is calculated 40 times per sampling interval.
<Filter processing>
Filter processing performed on the GL840 is the moving average shown in the following gure.
D
n
n-1
n-2
n-3
n-4
If the lter setting is 5,
The moving average is “D=((n-4)+(n-3)+(n-2)+(n-1)+ n)÷5”.
If the sample interval exceeds 30 seconds, the average value of data obtained in a sub-sample (30
seconds) is used.