Fairchild CAM/CCD-4KCL.TDI - Manual (Page 28)

EXSync
Exsync must toggle (200 Hz min.). The camera will not output lines if ExSync is
restricted to logic HIGH or logic LOW. Using an oscilloscope, check the camera
end of the control signal cable to verify that ExSync toggles.
Offset Variation or Drifts
The camera will experience offset drift and the dark level will increase if the
camera’s EXSYNC signal stops or is below 200 Hz. The camera is meant to be run
with a continuous EXSYNC frequency. EXSYNC should pulse to logic HIGH to start
the readout of each line, return to logic LOW, and stay LOW until after line readout
and clamping
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.
Verify that your acquisition system samples data on the rising edge of STROBE.
Horizontal Lines or Patterns in Output
Patterns can be caused by low-frequency illumination variations. Use a DC or high
frequency light source.
No Output or Erratic Behavior
If your camera provides no output or behaves erratically, it may be picking up
random noise from long cables acting as antennae. Where possible, connect
unused pins to known logic levels. Do not attach wires to unused pins. Verify that
the camera is not receiving spurious inputs.
Vertical Patterns in Output
If dark columns or vertical patterns appear in your output, the optical path may be
contaminated. Clean your lenses and sensor windows with extreme care.
Images are too bright or too dark
Make sure that the lens cap has been removed.
Check the lens aperture. If the images are too dark, try opening the aperture. Try
closing the aperture if they are too bright.
Fairchild Imaging • CAM/CCD 2KCL.TDI & CAM/CCD-4KCL.TDI Line Scan Camera User’s Manual • Rev C• 28 of 30