AT-200CL
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9.3 Pulse Width Control Trigger Mode
In this mode the accumulation time is equal to the trigger pulse width. Here it is possible to
have a long time exposure. The accumulation can be automatically set either LVAL
synchronous or LVAL asynchronous in relation to FVAL and trigger timing. Refer to chapter
7.2.4. The maximum recommended exposure time is <2 seconds.
The resulting video signal will start to be read out after the trigger’s rising edge.
For timing details, refer to fig.26 through fig.31 . and fig.35 through fig.37 .
To use this mode:
Set function:
Trigger mode to “Pulse width control”. TR=2
Scanning
SC=0 ,1
Vertical binning
VB=0, 1
Other functions and settings
Input:
Ext. trigger. Camera Link or 12 Hirose TI=0, TI=1
Important notes on using this mode
Trigger pulse width >2 LVAL to <2 seconds.
Minimum trigger interval is shown in the following table.
Mode
Minimum trigger interval
LVAL Sync
1.Exposure time < 1252L
1252L + 3L
2.Exposure time ≥ 1252L
Exposure time +2L
LVAL Async
Exposure time + 1252L +3L
Smearless is ON
Smearless time (181L) +Exposure time + 1252L + 3L
Note: 1) On the above table, 1252L is FVAL interval on normal continuous mode
2) In the vertical binning mode, 1L is different from the normal scanning. So, the minimum
trigger interval will be different.
9.3.1 PWC timing
Fig. 34. Pulse Width Control.
2 L
1
E f f e c t i v e L i n e s
2 3 4 5
O B
D V A L
D A T A
O U T
t 1
W h e n t h e L V A L S y n c A c c u m . : t 1 = 0 . 5 t o 1 . 5L
,
t 2 = 1 . 5 L
W h e n t h e L V A L A s y n c A c c u m . : t 1 = 0 . 5 L ,
t 2 = 1.0 t o 2 . 0 L
t 2
L V A L
S U B
S G
F V A L
E E N
E x t . T r i g
E x p o s u r e
P e r i o d
X E E N
(Hirose 12pin)
1 2 3 6 L
Mi n: 2L~Max: 40V( 50080L)
O B
1 0 L
12
36
1L=1966 clock (39.32 μs)
1248L
