Baumer VEXG, Руководство пользователя

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8.4.6 Debouncer
The basic idea behind this feature was to seperate interfering signals (short peaks) from
valid square wave signals, which can be important in industrial environments. Debouncing
means that invalid signals are filtered out, and signals lasting longer than a user-defined
testing time t
DebounceHigh
will be recognized, and routed to the camera to induce a trigger.
In order to detect the end of a valid signal and filter out possible jitters within the signal, a
second testing time t
DebounceLow
was introduced. This timing is also adjustable by the user.
If the signal value falls to state low and does not rise within t
DebounceLow
, this is recognized
as end of the signal.
The debouncing times t
DebounceHigh
and t
DebounceLow
are adjustable from 0 to 5 msec in steps
of 1 μsec.
low
high
U
t 0
0.3V
3.3V
30V
low
high
U
t 0
0.3V
3.3V
30V
t
∆t
1
∆t
x
- high time of the signal
t
DebounceHigh
- user-defined debouncer delay for state high
t
DebounceLow
- user-defined debouncer delay for state low
t
DebounceHigh
∆t
2
∆t
3
∆t
4
∆t
5
∆t
6
t
DebounceLow
Incoming signals
(valid and invalid)
Debouncer
Filtered signal
Debouncer:
Please note that the edges
of valid trigger signals are
shifted by t
DebounceHigh
and
t
DebounceLow
!
Depending on these
two timings, the trigger
signal might be temporally
stretched or compressed.