CV-M71A
-19-
FIGURE 24.Edge pre-select. HD async. accumulation.
6.4.5 Pulse Width Control Trigger Mode
In this mode the accumulation time is equal to the trigger pulse width. Here it is possible to have long time
exposure. The maximum recommended time is <120 frames.
The accumulation can be HD synchronous or HD asynchronous. The exposure start delay is shown below the
timing drawing. To avoid up to 1LVAL time jitter in HD synchronous accumulation, it is recommended to
synchronize the trigger to HD. (See fig. 18.).
Use LVAL synchronous accumulation (LS=0) for highest trigger rate. Here a new exposure can be started while
the previous is read out. The trigger pulse should end >2 LVAL after FVAL goes low.
The resulting video signal will start to be read out after the trigger rising edge.
For timing details, refer to fig. 12. through fig. 13. and fig. 24.
To use this mode:
t1. Exposure start delay
Exposure Time
< or =1/
25,000
1/75,000
1/100,000
1/150,000
1/300,000
Sync. accum.
4-30
μ
sec.
30-
57
μ
sec.
34-60
μ
sec.
37-64
μ
sec
40-67
μ
sec.
Async. accum
4
μ
sec.
4
μ
sec.
7
μ
sec.
11
μ
sec
14
μ
sec.
Set function:
Trigger mode to
Pulse width control
TR=2
Shutter mode to normal or programmable
SM=0, SM=1
Accumulation HD synch. or asynch.
LS=0, LS=1
Edge Pre-Select mode (int_VD Period, Asynchronous mode)
Ext. Trig.
WEN OUT
SYNC OUT
int_XSUB
int_XSG
(Exposure)
XEEN OUT
int_VD
(CCD out)
Video out
1L(Min) ~ 1Frame (Max)
t1 (See Note!)
582
590
2
5.5 to 6.5L (CCD out delay)
8
576
12
