GW Instek GDM-906 Series - Digital Filter Setting

GDM-906X Series User Manual
84
Filter count
Filter count defines the number of samples to be
averaged per reading. More samples offer low noise but
a long delay. Less samples offer high noise but a short
delay.
Range
2 ~ 100
Filter window
Filter window defines the threshold for when the digital
filter data is updated again. When the AD data falls in the
range between TH and TL, the filter keeps processing.
When the AD data falls out of the range between TH
and TL, the filter will restart. When measuring unstable
signals, appropriately setting the filter window can
improve the measurement speed.
Time
AD data
TH
TL
TH
TL
TH
TL
Filter
Filter
Filter
Restart
Restart
TH: Threshold High, TL: Threshold Low
Filter window
Formula
Measure:
Previous data*(1-window)< threshold< previous
data*(1+window).
Range:
Previous range*(1-window)< threshold< previous
range*(1+window).
There are 5 windows range settings that can be chosen:
10%, 1%, 0.1%, 0.01% and none
Digital Filter Setting
Filter
setting
Press the Shift key + Menu (Filter) key. The Filter
setting menu shows as the figure below.