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VA GigE series
8.6
Real Exposure
8.6.1
Timed Exposure Mode
When the Timed mode is selected, the exposure time is determined by the time interval between the point
where an external trigger signal is applied and the point where the t
(Photodiode Transfer) signal falls.
pd
The camera generates a shutter signal to clear pixels when an external trigger signal is applied. The exposure
time begins when the shutter signal falls and continues until the t
(Photodiode Transfer) signal falls. As Figure
pd
8.9 shows, there is an Exposure Start Delay (refer to Table 8.3) between the rise of the external trigger signal
and the rise of the shutter signal. The setting value on the Exposure Time parameter is equal to the exposure
time, because the t
value of the shutter signal and Transfer Pulse Offset value (t
, t
) are compensated on
sub
pd
3p
the exposure time by the camera's logic internally. Therefore, there is no difference between the setting value on
the Exposure Time parameter and the exposure time. The t
value and Transfer Pulse Offset value are
sub
determined by the CCD sensor used in the camera.
Figure 8.9 Real Exposure with Timed Exposure Mode
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RA14-131-003
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