Dark Patches - Dalsa 4M30 User Manual

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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.
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2.
3.
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03-032-20044-01
Take standard ESD precautions.
Wear latex gloves or finger cots
Blow off dust using dry, filtered compressed air. 'Canned' air can cause droplets to
be deposited on the window which may result in visible spots after they dry.
Fold a piece of optical lens cleaning tissue (approx. 3" x 5") to make a square pad that
is approximately one finger-width
Moisten the pad on one edge with 2-3 drops of clean solvent (alcohol). Do not
saturate the entire pad with solvent.
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.
Repeat steps 2-4 using a clean tissue until the entire window has been cleaned.
Blow off any adhering fibers or particles using dry, filtered compressed air.
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