CM-140 GE / -RA/-UV / CB-140GE/-RA
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9.3. Auto-detect LVAL-sync / async. accumulation
This function replaces the manual setting found in older JAI cameras. Whether accumulation is
synchronous or asynchronous in relationship to LVAL depends on the timing of the trigger input.
When 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.
If trigger is received when FVAL is low, the cameras works in LVAL-asynchronous (no delay) mode.
This applies to both pre-select (PS) trigger mode and pulse width (PW) trigger mode.
Ext. trigger
FVAL
(1)
(3)
(1) In this period camera executes trigger at next LVAL (prevents feed-through noise)
(2) Avoid trigger at FVAL transition (
+/- 1 LVAL period), as the function may randomly switch
between "next LVAL" and "immediate".
(3) In this period camera executes trigger immediately (no delay)
(2)
Fig. 27 Auto-detect LVAL sync /async accumulation
