Pike
Technical
Manual
V5.2.3
180
Controlling image capture
Controlling
image
capture
Debounce
Only
for
input
ports:
There
is
an
adjustable
debounce
time
for
trigger:
separate
for
each
input
pin.
The
debounce
time
is
a
waiting
period
where
no
new
trigger
is
allowed.
This
helps
you
to
set
exact
one
trigger.
The
debounce
feature
is
applied
in
cases
of
bad
signals.
The
aim
is
to
let
the
trigger
run,
when
the
signal
is
debounced.
To
set
this
feature
in
an
advanced
register,
see
To
set
this
feature
in
SmartView:
Trig/IO
tab,
Input
pins
table,
Debounce
column.
Low pass
Debounce
acts
like
a
low-pass
filter
with
debounce
time
acting
as
resistance-
capacitance
element.
That
means:
with
increasing
debounce
time
trigger
will
release
later.
Example
Debounce
time
set
to
20
µs.
A
switch
debounces
with
5
µs
high
pulse
and
1
µs
low
pulse.
During
high
pulse
an
internal
counter
adds
one
cycle,
during
low
pulse
the
counter
subtracts
one
cycle.
Therefore
high
pulses
at
input
pin
have
to
be
20
µs.
Internal
counter
sees:
5
µs
-
1
µs
=
4
µs
Number
of
periods
during
debounce
time:
20
µs
/
4
µs
=
5
That
means
5
periods
×
6
µs
=
30
µs
The
trigger
starts
after
30
µs
while
the
debounce
time
was
set
to
20
µs.
Note
•
Switching
trigger
delay
to
ON
also
switches
external
Trigger_Mode_0
to
ON.
•
This
feature
works
with
external
Trigger_Mode_0
only.
Figure 79: Example of debounce time for trigger
Trigger
signal
Debounce time
