Dalsa Spyder3 User Manual page 72

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There are no line rate limitations other than the amount of gate dark current that can be
tolerated at low line rates.
There are no timing or exposure anomalies other than situations where EXSYNC is
removed from camera. In this case, the camera will operate in a "watchdog" state.
For information on artifacts that may be experienced while using this mode, see the
Artifacts section below.
Gate dark current clear mode (always on, srm 1)
In this mode the gate dark current will be cleared continuously.
After the trigger (EXSYNC) is received, the dark current is cleared from the image sensor
before the image is acquired. The line rate is limited to ½ the maximum line rate available
for that model of camera.
For information on artifacts that may be experienced while using this mode, see the
Artifacts section below.
Table 17. Maximum Line Rates
Model
SC-30-02k80
SC-30-04k80
When operating in the dark current clear mode, there will be a slight delay,
equivalent to one readout time, before the actual exposure is implemented. The
actual exposure time will not be altered.
Table 18. Exposure Delay and Maximum Exposure Time in Auto Mode
Model
SC-30-02k80
SC-30-04k80
Auto Mode (default, srm 0)
In this mode the line rate from the camera will automatically cause a switch between
the gate dark current clear mode and non gate dark current clear mode.
The frequency of when this mode switchover occurs depends on the camera model.
In cases where the line rate is rapidly increased from below the Dark Current Clear
to Immediate Readout Transition Frequency to above the Immediate Readout to
Dark Current Clear Transition Frequency, the first line following this transition will
likely be corrupted.
The table below outlines the artifacts that may be seen during this transition period.
All subsequent lines after this occurrence will be as expected.
03-032-20059-01
Max. Line Rate
Immediate Readout
Mode
18000 Hz
9000 Hz
Exposure Delay and Max Exposure Time in Auto
Mode
55.5 µs
111 µs
Dark Current Clear
Mode
9000 Hz
4500 Hz
Spyder3 Color Manual
DALSA