Tektronix 5000 Series User Manual

4634 SCAN
RATE
CALIBRATION
( CONTINUED
)
4 .
5 .
6 .
7 .
b .
Fine
adjust
R27 by
making
copies
and
measuring
the
horizontal
image
size
. It
is
best to
have
the
image
about
1/8
inch
larger
than
the final
desired
size .
This
is
because
the
blanking
(
step 8 )
will
, of
necessity
remove a
portion
of
the
image .
Adjust
R11 (
vertical
image
size
)
for
the
correct height
.
This
will
usually
be
6 "
and can be
measured
with
a
ruler
directly on
the
CRT
faceplate
.
As
with
the
previous
step ,
it
is
best
to
set
the
size
about
1/8 "
larger
than
desired
because
the
blanking
in
step
8
will
require
removing
some
of the
video
.
Now
,
run
a
copy or
two to
verify
that
the
image
is
indeed
slightly
larger
than
6 "
X 8 " , 6
" X 6 " ,
4 " X 8 "
, etc. ,
depending
upon the
aspect
ratio of the customer's system .
If the
size
is
indeed
correct
, check
that the
image
is
centered
on the
page
. If
not ,
adjust
R70 (
horizontal
image
position )
or
R5 (
vertical
image
position )
as
required .
When
adjusting
R70
,
be
certain
to allow
at least
1.4
inches of
border
from
the
edge
of
the
paper to
the begin
ning
of
the
image
.
Failure
to
do
so
may
result
in
a
smeared
left
-
hand
side of
the
image .
The
customer's
installation
may
have
non
-
interlaced
video .
If
this
is
the
case ,
the
image
will
be
hard to
distinguish
due to
the
striking
distinctness
of
individual
lines .
To
cope with
this ,
adjust
R3
(
interlace
) as
follows
:
Start
with
R3 in
the fully
counter
-
clockwise
position
.
b .
While
observing
the
front
of
the
CRT ,
slowly
turn
R3
clockwise
.
Stop
turning R3
when
the
scan
lines
appear to
double in
number
and are
equally
spaced
.
Though
continued
turning
of
R3
may re
veal
a
second
setting
where
the lines
double
in
number
and
are
equally
spaced
,
the
resolution of
the
image at
that
setting
will
be inferior .
Now that
a
properly
sized
and
centered
image
has
been
obtained
,
its
time
to
" pull
in
the
blanking . "
Adjust
R19
,
R20 ,
R40
and
R50 to
blank
out the
horizontal and
vertical
intervals (
those
black
lines
bordering
the
image
) .
To
ensure that
slight
variations
from
drift
and
vibration
do
not
cause
the "
margins " to
reappear
, it
is
necessary to
blank
out
a
small
portion
of
the
video
information .
An
overlap
of
one -
sixteenth
of an inch is usually sufficient .
Run a
final
copy and
measure
the
image .
If image size is correct , paper
length
is
correct ( it
is
variable
from 7
to 11
inches
)
and
all
else
is
well with the product , then replace the cover .
Adjustment
is
complete .
a
.
C.
8 .
9 .
Unlike
the 4632
,
the
4634
will
probably
not require
adjustment
of
the
video
input
compensation
capacitor
,
c125
.
My
thanks to
Joern
Eriksen for
advice
and
inspiration
on
the
graphics .
--George
Kusiowski
63/503
,
ext .
3928
-35
June 27 , 1980
Issue
10-13

Tektronix 5000 Series Specifications

General

Brand	Tektronix
Model	5000 Series
Category	Test Equipment
Language	English