Spyder3 S3-14 and S3-24 Monochrome Camera User's Manual 77
Teledyne DALSA 03-032-20117-01
Appendix A
Clearing Dark Current
Gate Dark Current Clear
Note: This feature is not available for the S3-24-04k40 camera model.
Image sensors accumulate dark current while they wait for a trigger signal. If the readout is not triggered
in a reasonable amount of time, then this dark current accumulation may increase to an excessive
amount. The result of this happening will be that the first row, and possibly additional rows (frames), of
the image will be corrupt.
The sensor used in this camera contains two sources of dark current that will accumulate with time: 1) in
the photo sensitive area, and 2) in the gates used to clock-out the charge.
The gate dark current can account for approximately 20% of the total dark current present. While the
exposure control has direct control over the amount of dark current in the photo sensitive area, it has no
control over the charge accumulated in the gates. Even with exposure control on, at low line rates, this
gate charge can cause the camera to saturate.
Using the Set Readout Mode (srm) command, the camera user can control the camera's behavior in
order to minimize the dark current artifact.
The modes of operation selected by the srm command are: Auto, On, or Off.
Note: This command is only available in low sensitivity and tall pixel modes. High sensitivity mode
operates only in the immediate read out position.
0Hz
Watchdog
Frequency
Max. Line Rate in
Immediate
Readout Mode
Increasing Line Rate
Frequency
Dark Current
Clear
Immediate
Readout
Dark
Current
Clear to
Immediate
Readout
Transition
Frequency
Immediate
Readout to
Dark
Current
Clear
Transition
Frequency
Max. Line Rate in
Dark Current Clear
Mode
Mode
Figure 28: Gate Dark Current Clear
Table 17.
Dark Current Clear to Immediate Readout
Transition
Immediate Readout to Dark
Current Clear Transition
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