User`s manual

Basic Operation and Features
3-26 Basler A500k
PRELIMINARY
3.3.4.2 Free-run Mode with Synchronous/Asynchronous Timing
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).
A504k A503k A501k
p Exposure as set by Timer 1
d
1 µs ... 3 µs 1.25 µs ... 3.75 µs 7.2 µs ... 20.2 µs
f
< 1 µs
 1.25 µs
< 0.8 µs
g < 1 µs
 1.25 µs
< 0.2 µs
Internal
Control
Signal
p = Timer 1
Internal Control Signal Period
Timer 2
Frame
Valid
Line
Valid
3.3 µs (A504k)
3.8 µs (A503k)
20.6 µs (A501k)
d = 1 µs ... 3 µs (A504k)
d = 1.25 µs ... 3.75 µs (A503k)
d = 7.2 µs ... 20.2 µs (A501k)
Integrate
Enabled
f =

1 µs (A504k)
f =

1.25 µs (A503k)
f =

0.8 µs (A501k)
p = Timer 1
TIMING CHARTS ARE NOT DRAWN TO SCALE
g =

1 µs (A504k)
g =

1.25 µs (A503k)
g =

0.2 µs (A501k)