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lris adjustment
Manual iris lenses:
1. Install the camera in the position where it will be
used. Aim and focus the camera on the
object/area that will be monitored.
2. Set the iris to its minimum aperture. The camera
will now show a low contrast picture with 'noise'.
3. Open the iris slowly. The picture contrast will
improve and the 'noise' will gradually disappear.
4. Set the iris to the position at which the details in
the larger white parts of the picture are not
washed out.
Auto-iris CCTV lenses:
(Also consult the documentation of the auto-iris lens)
Auto-iris lenses are usually pre-adjusted for an
acceptable image under average conditions.
Re-adjustment may be necessary to obtain the
optimum picture quality.
1. Aim the camera at a grey scale test chart.
2. Setthe 'ALC' variable resistor on the lens to its
average position.
3.
Connect an oscilloscope to the iris control output,
pin 5 (fig. 7- G). Adjust the setting of the 'Level'
variable resistor until the maximum signal from
the scene (peak white) reads 1 Volt on the
oscilloscope.
Note:
If you have no suitable test chart, aim the camera at
the scene you want monitored and proceed as
described above.
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