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The shutter speed for each operation mode is shown below.
Mode
Continuous
Edge Pre-select
Pulse Width
Note: In Pulse Width mode, the minimum trigger pulse width requires more than 2LVAL.
Auto shutter
AT-200CL has an automatic shutter function which sets the video at an appropriate level
depending on illumination.
Auto shutter range: 1/20 sec to 1/2400 sec
7.2.4 Auto-detect LVAL-sync / a-sync accumulation
This function replaces the manual setting found in older JAI cameras. Whether accumulation
is synchronous or asynchronous in relation to LVAL depends on the timing of the trigger input.
When a trigger is received while FVAL is high (during readout), the camera works in LVAL-
synchronous mode, preventing reset feed-through in the video signal. There is a maximum
jitter of one LVAL period from issuing a trigger and accumulation start.
When a trigger is received during FVAL low, the camera works in LVAL-asynchronous mode (no
delay) mode.
This applies to both Edge Pre-select (EPS) trigger mode and Pulse Width Control (PWC) trigger
mode.
External Trigger
FVAL
(1) In this period camera executes trigger at next LVAL (prevents feed-through noise)
(2) Avoid trigger at FVAL transition (+/- LVAL period), as the function may randomly
switch between " next LVAL " and " immediate ".
(3) In this period, camera executes trigger immediately ( no delay).
AT-200CL
Read Out
Minimum shutter speed
Full
15.48 µs at PE=0(1/51,000)
Partial
V binning
20.62 μs at PE=0(1/45,000s)
Full
39.32 µs x 2L+15.48 µs( 0.5L)=
Partial
94.12 µs （≒1/10,965s）(Note)
V Binning
44.32 µs x 2L + 20.62 µs(0.5L)=
109.26 µs （≒1/9.152s）(Note)
(1)
Fig.16. Auto-detect LVAL sync/async accumulation
(2)
(3)
+/- 1 LVAL
- 18 -
Maximum
shutter speed
39.32µs x
1252L=1 Frame
(49.22ms)
40 Frames
( 2 seconds )
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