56 Piranha 2 User’s Manual
03-032-00493-14 Teledyne DALSA
Line Dropout, Bright Lines, or Incorrect Line Rate
Verify that the frequency of the internal sync is set correctly, or when the camera is set to
external sync that the EXSYNC signal supplied to the camera does not exceed the
cam era’s maxim u m specified line rate.
Noisy Output
Check your power supply voltage outputs for noise. Noise present on these lines can
result in poor video quality. Low quality or non-twisted pair cable can also add noise to
the video output.
Dark Patches
If dark patches appear in your output the optics path may have become contaminated.
Clean your lenses and sensor windows with extreme care.
1. Take standard ESD precautions.
2. Wear latex gloves or finger cots
3. Blow off dust using a filtered blow bottle or dry, filtered compressed air.
4. Fold a piece of optical lens cleaning tissue (approx. 3" x 5") to make a square pad that
is approximately one finger-width
5. Moisten the pad on one edge with 2-3 drops of clean solvent—either alcohol or
acetone. Do not saturate the entire pad with solvent.
6. Wipe across the length of the window in one direction with the moistened end first,
followed by the rest of the pad. The dry part of the pad should follow the moistened
end. The goal is to prevent solvent from evaporating from the window surface, as this
will end up leaving residue and streaking behind.
7. Repeat steps 2-4 using a clean tissue until the entire window has been cleaned.
8. Blow off any adhering fibers or particles using dry, filtered compressed air.
Stuck Bits
If data bits seem to be stuck or do not change, check that the camera is not saturated by
preventing light from entering. To verify the data path integrity, check the levels of the 2
test pattern pixels (first 2 pixels following the last End -of-line pixel. You may need to turn
the End-of-line sequence ―on‖ by sen ding the command els 1). Any deviation from a
consistent value of these pixels (170DN/ 85DN) could be an indication of the following:
shorted bits
stuck bits
digital noise pickup on the I/ O cable
open connection.
To activate the test pattern, use the command svm 2. Use the test pattern to verify the
proper timing and connections between the camera and frame grabber.
To receive a complete line of raw video data (without digital processing or test pattern)
through the RS232 port, use the command gl. The returned data displays one pixel value
after another and the minimum, maximum, and mean value of the sampled line. Use this
command to ensure the proper video input range.
Probe the output lines with an oscilloscope. Disconnect the digital cable from the camera
and check the digital signals at the output of the camera. Ensure that the correct values
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