User`s manual
Piranha HN RoHS User Manual
Teledyne DALSA 03-032-20135-01
63
The approximate location of the sensor position is at the first groove in the side of the case, back
from the front face as shown in the mechanical illustration.
4. Camera Timing & Control
It is easiest and quickest to evaluate the camera using the internal timing setups for line rate and exposure
time.
Since we recommend starting with Camera Link medium mode, set a suitable line rate less than
20 KH z, u sing the ‗ssf‘ com mand.
The camera is a TDI line scan-type camera and therefore it is important that the synchronization
frequency (EXSYNC) is set to provide a sync signal at the equivalent object motion time. Refer to
the EXSYNC binning diagrams in this manual for clarification.
Set you r camera direction u sing the ‗scd ‘ com mand. Refer to the Sensor Shift Direction diagram
in this manual for a d efinition of ‗forw ard‘ and ‗reverse‘.
5. Acquiring an Image
You can now begin imaging. Unless you have an application employing lots of light, the image is likely to
be too dark.
Use the system gain to adjust the camera output to achieve the desired response. The system gain
range is from 0 dB to 20 dB.
Once you have a suitable response, you can now focus the lens.
The image may be darker at the edges due to lens vignetting, but this will be improved once the
camera is calibrated.
6. Calibration
The camera is shipped with the calibration accomplished with the following conditions:
Gain set to minimum (sg 0)
Horizontal Binning modes off (sbh 1 or sdh 1)
Line rate at 7500 Hz
However, if the camera is operated under different conditions and in particular at hig her gains, with
binning modes on, or at a different significantly slower line rate, then the calibration will not be optimum
or no longer valid. The calibration in particular is the fixed pattern noise (FPN) which is the variation in
pixel response in darkness, and the photo response non-uniformity (PRNU) which is the variation in
pixel response w ith illumination. This calibration is also referred to as ―flat field corr ection‖.
Fortunately, the FPN and PRNU can be recalibrated by the user after new oper ating conditions are
applied. It is highly recommended that the FPN and PRNU correction be re-calibrated if the operating
conditions are different than listed above.
FPN Correction
The FPN correction is easy to apply. The basic procedures are to remove all light (or apply a lens cap on
the camera) and then issue the ccf command.