CAMERA LINK vieworks LVC-25MC2-30, Руководство пользователя

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VC Camera Link series
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8.4.1 Real Exposure (VC-12MC Only)
In VC-12MC-65, when you set the Trigger Mode to Free-Run or the Exposure Mode to Program, the exposure
time will be determined by the user settings (
“set” command). With these settings, the camera will generate
trigger signals internally. As soon as the camera detects a trigger signal, the camera will begin a frame exposure.
When the exposure time ends, the pixels are being sampled and prepared for readout. This sequence is called
the frame overhead time (FOT). Immediately after the FOT, the frame is read out automatically. During the FOT,
an additional exposure time will be applied as the offset value shown in the Figure 8.5. This offset value varies
depending on the camera
’s Camera Link Output Mode settings. The setting value on the exposure time is equal
to actual exposure time, because the offset value is compensated on the actual exposure time. In 8 tap output
channel mode, for example, the exposure time is set to 200
㎲
. The camera will subtract offset value 50
㎲
from the exposure time setting internally, and thus the actual exposure time will be 200
㎲
as the user settings.
Due to the offset value, the minimum exposure time is limited as shown in the Table 8.6.
Figure 8.6 Real Exposure for VC-12MC-65
Camera Link Output Mode Offset Value
2 Tap
50
㎲
4 Tap
50
㎲
8 Tap
50
㎲
10 Tap
40
㎲
Table 8.6 Offset Value for VC-12MC-65
Camera Link Output Mode Minimum Exposure Time
2 Tap
50
㎲
4 Tap
50
㎲
8 Tap
50
㎲
10 Tap
40
㎲
Table 8.7 Minimum Exposure Time for VC-12MC-65