Tektronix 7834 Manual

4634 SCAN
RATE
CALIBRATION
The
4634
purchased
as
an
end -
user
product
(
Option 45
) is
installed
by
Tektronix
Field
Service
free of
charge .
Unlike
the 4632
, options
are
not
used
to
indicate
changes in
calibration .
A11 4634's are shipped from the
factory
calibrated
to
the
525/60
NTSC
interlaced
standard .
The free
in
stallation therefore includes adjustments so the 4634 copies correctly
from
the
customer's
system
.
The need
for
readjustment
may be
indicated
by any of the following :
1. Substantial portions of the raster picture are missing on the
hard
copy
,
2 .
the aspect ratio of the image is incorrect ( image appears
stretched or compressed .
3.
Large
portions of
the
image
area
are
occupied
by
black
( or
white )
margins , or
4
.
the
raster
lines are
so
evident as
to
severely
detract
from
the
image
quality (
lack of
interlace )
.
Figure
1 shows
the
various
controls
to be
adjusted
on the
670-5723
- OX
timing
board
used
in
the
4634.
Figure
2
illustrates the
approximate
effect
obtained
on
a
copy by
adjusting
these
controls
.
Use these
figures
for
reference as
you proceed
with the
calibration
. In
the
event
the
4634 re
quires
more
extensive
calibration
, or
possibly
troubleshooting ,
please
refer
to 4634 Instruction Manual , p / n 070-2562-02 .
The
technician
may
recognize that
the
following
adjustments
are
similar to
those
done on
a
4632 to change
its
calibration
.
They are easier to perform
on the 4634
,
however ,
because the
interactions
among horizontal
image size
( R27 ) , horizontal resolution ( R29 ) , horizontal position ( R70 ) and paper
Tength ( R90 ) have been reduced to a minimum or removed altogether .
R3 R5 R11 R19 R20 R27 R29
R40 R50
R70 R80
S80
R90
TP30
Interlace
Sample
Normal
Vertical
Position
Vertical
Size
Bottom
Field
Blanking
Top
Field
Blanking
Horizontal
Resolution
Horizontal
Size
Right
Line
Blanking
Left
Line
Blanking
Horizontal
Position
Sample
Position
Paper
Length
:
Figure
1
:
4634
Timing
Board
Controls
( continued on the following page )
-33
June
27 ,
1980
Issue 10-13

Tektronix 7834 Specifications

General

Brand	Tektronix
Model	7834
Category	Test Equipment
Language	English