Free-Run Mode With Synchronous/Asynchronous Timing - Basler A500k User Manual

Basic Operation and Features

3.3.4.2 Free-run Mode with Synchronous/Asynchronous Timing

Internal
Control
Signal
Frame
Valid
Line
Valid
Integrate
Enabled
TIMING CHARTS ARE NOT DRAWN TO SCALE
Figure 3-21: Free-run, Programmable Mode - Exposure Start with Frame Valid High, Exposure
Stop with Frame Valid Low
The effective exposure starts while the Frame Valid signal is high and stops while the Frame Valid
signal is low. The Integrate Enabled signal is set to high while the effective exposure occurs. The
start, stop, and duration of the effective exposure are defined in the following ways (see Figure 3-
21):
• The effective exposure starts d microseconds after the fall of the internal control signal (expo-
sure start delay).
• Disregarding possible jitter, the duration of the effective exposure is defined by period p (set
by Timer 1).
• Jitter may shorten (f) or extend (g) the effective exposure, i.e.
duration of the effective exposure = (p - f) to (p + g).
p
d
f
g
3-26
PRELIMINARY
p = Timer 1
d = 1 µs ... 3 µs (A504k)
d = 1.25 µs ... 3.75 µs (A503k)
d = 7.2 µs ... 20.2 µs (A501k)
p = Timer 1
f =  1 µs (A504k)
f =  1.25 µs (A503k)
f = 0.8 µs (A501k)
k
A504 A503
Exposure as set by Timer 1
1 µs ... 3 µs 1.25 µs ... 3.75 µs

< 1 µs
1.25 µs

< 1 µs
1.25 µs
Internal Control Signal Period
Timer 2
3.3 µs (A504k)
3.8 µs (A503k)
20.6 µs (A501k)
g = 1 µs (A504k)
g =  1.25 µs (A503k)
g =  0.2 µs (A501k)
k k
A501
7.2 µs ... 20.2 µs
< 0.8 µs
< 0.2 µs
k
Basler A500