III Adjustment of the AI lenses,
Signal level
The camera signal level can be adjusted
from 0,5 to 1,0Vpp using potentiometer (2).
An oscillograph and a well-lit test pattern
(min. 3.000lux) are used for this purpose.
If these test aids are not available, an
approximate adjustment has to be tried
according to the subjective picture
impression: turn control (2) to the left if the
picture is too bright and to the right if the
contrast is too low.
IV Adjustment of the DC control lens
The switch should be set to „DC” if a
convertible camera is being used.
White level (peak value)
Black level
Synchronizing level
0,5 - 1,0 Vpp
Average picture
level (APL)
Camera specifications should be observed
for lens adjustment.
›
AUTOIRIS
DC
VIDEO
Average and peak value control
If the picture still is not satisfactory,
despite correct level adjustment, large
differences in brightness levels in the
picture which falsify control could be the
reason. This can be corrected with the
Pk/Av potentiometer (3). When leaving the
factory the lenses are set at an average
control level. Continuous adjustment up
to 100% peak control value is possible by
turning the control to the left to provide
better recognition of picture areas which
are too bright.
