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Extended figure(1)
At exposure start
Exposure Timing
Internal LVAL
Internal FVAL
Extended figure(2)
At exposure end
Exposure Timing
Internal LVAL
Internal FVAL
7.2.4
ExposureAuto
This is a function to control the exposure automatically. It is effective only for Timed.
ALC Reference controls the brightness.
There are three modes: OFF, Once and Continuous.
OFF:
Once:
Continuous:
In this mode, the following settings are available.
ALC Speed:
ASC Max:
ASC Min:
ALC Reference:
ALC Channel area:
SP-20000M-CXP2 / SP-20000C-CXP-2
side
Fig.24
Extended figure at the exposure start side
side
Fig.25
Extended view for the exposure end side
No exposure control
Exposure adjusts when the function is set, then remains at that setting
Exposure continues to be adjusted automatically
Rate of adjustment can be set (common with Gain Auto)
The maximum value for the exposure time to be controlled can
be set
The minimum value for the exposure time to be controlled can
be set
The reference level of the exposure control can be set (common
with Gain Auto)
The measurement area of the exposure control can be set
In overlap condition, the
exposure start timing is
changed by 1 LVAL unit.
"Active"
"Non-Active"
"Non-Active"
- 42 -
In
Continuous
Trigger
operation, if the exposure
time
is
increased,
the
exposure start point will be
increased 1 line step.
In continuous trigger, if the
exposure time is increased by 1
µs, the exposure completion is
delayed by 1 µs. This delay with
1 µs step is reset if the delay
exceeds 1 line. This exposure
time increase of 1 line is
adjusted so that the exposure
start timing is 1 line ealier.
Maximum 1 line is delayed.
As the period between the
exposure completion and the
next FVAL active is a fixed
value, the frame rate has a
delay of this amount.
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