JAI CV-M2 - Manual (Page 15)

CV-M2
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6.2.7. LVAL synchronous accumulation
With LS=0, the accumulation will start synchronously with LVAL. The trigger pulse should be
longer than 2 LVAL intervals, and the accumulation will then start at the first LVAL after the
trigger leading edge. The exposure start delay will be up to 1 line. (Single channel 47.9 µsec.
Dual 27.3 µsec).
In EPS mode the exposure stops 0.5 L after the selected shutter time, (in number of LVAL).
In PWC mode the exposure stops 0.5 L after the first LVAL after the trigger trailing edge. It
results in up to 1 LVAL jitter.
In LVAL synchronous accumulation mode a new trigger can start a new exposure during the
previous frame read out, but the exposure may not be finished before the frame is read out. It
makes it possible to have a trigger rate close to the frame rate. (1 FVAL + 3 LVAL).
Important notes on using this mode.
In LVAL synchronous PWC mode exposure jitter up to 1 LVAL can be the result, if the trigger
trailing edge is not synchronized to LVAL.
LVAL
Ext . Tr i g
Mi n. : 2L
0. 5L
SUB
SG
Exposur e
Per i od
Vi r t ual SUB
Equi val ence
Pul se
Dat a- out del ay
Si ngl e: 1. 5L
Dual : 1. 5L
FVAL
Speci f i ed Number of LVALs
by shut t er set
Act ual Exposur e Per i od
DATA OUT OB OB
Exposur e del ay:
Max 1L
Fig. 21. LVAL synchronous accumulation in EPS mode
LVAL
Ext . Tr i g
0. 5L
SUB
SG
Exposur e
Per i od
Vi r t ual SUB
Equi val ence
Pul se
Dat a- out del ay
Si ngl e: 1. 5L
Dual : 1. 5L
FVAL
Act ual Exposur e Per i od
DATA OUT OB OB
Del ay of exposur e st ar t :
Max 1L
Del ay of exposur e end :
Max 1L
Fig. 21A. LVAL synchronous accumulation in PWC mode