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EBI-3657
b.
Optical alignment must
be
optimized
to prevent
shading
due tO
this cause.
A
nonlinear Vidicon Camera sweep will
cause shading in the picture.
To correct for
minor horizontal
shading, adjust the
H
SHADE control, R30; and
the
V
SHADE control,
R34.
These controls
are on the
Vidicon Control
Unit.
c.
Adjust
the
Vidicon Control Unit TARGET control,
R24;
and the -BLANKING control,
R6; to
produce
a
picture with
10
percent
setup and white peaks
of 100
percent.
These percentages can
be
observed
on the
monitor oscilloscope.
The
Channel Amplifier
APR CORR switch,
Si,
may
be set in
position
2
if
desired.
Position
3
is
to
be
used only when
the
Channel Amplifier
is
being adapted
to image
orthicon systems.
Set the
Channel Amplifier GAMMA switch,
S3,
to
ON.
A
video picture should now
be
produced with
the
horizontal resolution exceeding 600 lines
in the
center and 500
lines
in the
corners.
9.
Linearity
a.
If it is
necessary
to make
linearity adjustments:
use
a
grating generator
as the
test signal input to
the
monitor and
a
standard EIA linearity
chart.
Adjust
the
Vidicon Control Panel
controls
V
LIN, R44;
H
LIN, R64;
LEFT LIN, R5$; HEIGHT, R42; and
WIDTH,
R70; to
obtain
a
linearity
of
better than +
2
percent
of the
picture height.
b.
If
appreciable changes
are
evident
in the
linearity,
verigy
the
raster
size and
centering
by
repeating step
6.a.
10.
Positive and Negative Film
a.
Adjust
the
Channel Amplifier BLANKING ADJUST
(POS)
control, R28, while adjusting the Vidicon Control Panel CONTRAST
control,
R10.
The correct
setting
of the
BLANKING ADJUST
(POS)
control
is
obtained when
the
blackest part
of the picture remains
stationery.
This can
be
observed
on the
monitor oscilloscope.
b.
.
If
negative film
is
used, the
Vidicon Control Panel
VIDEO switch,
S2,
must
be
placed
in the
NEG
position and
the
Channel Amplifier BLANKING
ADJUS`I
control, R29, as for positive film.
Gamma correction will
be
eliminated when
the
VIDEO switch
is set
to NEG.
c.
Reset
the
contrast after completing steps 10.a any
10.b.
The
contrast adjustment
is
outlined
in
step
5.b0
10
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