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Operation
11, 13
1.
Set INTENSITY,
and
PERSISTENCE full
ccw.
2.
Set LINE switch to ON
and observe
that
LINE indicator lights.
3.
Put instrument in write mode by
pressing
WRITE pushbutton.
Do not
allow
the dot to bloom
when
adjusting
the INTENSITY
control.
4.
Adjust INTENSITY control. Display dot
brightness
should
vary from
completely
ex-
tinguished
in
full ccw
position
to an accept-
able
viewing
brightness,
as
control
is
turned
cw.
5.
Adjust INTENSITY control so display dot is
easily
visible
with
minimum persistence.
1, 4, 5
3
6,8
7, 8
2
Model 1331A
1331A-
A-2
6.
Adjust HORIZ POSITION
control
through
its full range. Display dot will move hori-
zontally across CRT and out
of viewing
area
at either
extreme
of
control.
7.
Adjust VERT POSITION
control
through its
full range. Display dot will move vertically
across CRT and out
of
viewing
area
at either
extreme of control.
8.
Adjust
HORIZ
and VERT POSITION
con-
trols
to
center
display dot on CRT.
9.
Apply 1 kHz, 1 V p-p
signal
to X INPUT
connector.
This will
cause
horizontal trace to
appear
on
CRT.
10.
Adjust TRACE ALIGN
as
necessary to align
trace
with horizontal graticule
lines.
11. Adjust FOCUS
control
through its full range.
Display dot will be defocused
at each extreme
of
control
and
focused near midrange.
Adjust
for defocused display dot.
12. Adjust ASTIG
control
for best display dot
symmetry
(roundness).
13. Adjust FOCUS for smallest dot size.
Figure 3-2. Preoperational Procedure
3-4
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