I-7080, I-7080D, I-7080B, I7080BD User Manual (V 2.2) ------------------ 17
1.8.5
Digital Filter Setting
The digital filter is disable in frequency mode(51). The
digital filter is designed as a pulse-width filter in both high/low
pulse. The digital filter is valid for both nono-isolated & isolated
input. The digital filter can be enable or disable. The key points
of using digital filter are given as following:
1.
Use $AABS to select input signal.
2.
Use $AA0H(data) to set min. width of high level.
3.
Use $AA0L(data) to set min. width of low level.
4.
Use $AA4S to enable/disbale digital filter (both channels).
If the high width of input signal is small than the min. high
width of digital filter, this input signal will be filtered out. Also
the low width of input signal must be greater than the min. low
width of digital filter.
For example, the width of input signal is greater than 1000
us, the user can set the digital filter at 900 us. Therefore all noise
below 900 us will be filtered out by the digital filter. These steps
are given as following:
1.
$AAB0
2.
$AA0H00900
3.
$AA0L00900
4.
$AA41
