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Adjustments
d. Set pulse generator
controls as
follows:
repetition rate.................
..
...
1000 Hz
pu
lse
width .
. .
.
. . . . .
.
.
.
. . . . . . . . . . . . . .
4 usec
pulse amplitude. . . . .
. .
. . . . . . .
.
. . . . . . . . . .
1 V
pulse
polarity
. . . . . .
.
.
. .
.
.
. . .
.
. .
.
. .
.
positive
e. Apply
output
of
pulse gennator to Z INPUT.
f.
Connect
oscilloscope to flood gun
accelerator
(wh ite-black-blue
wire on A5).
g.
Press STORE pushbutton.
h. Set
store
time
adj
A6R2 for 10
1
Yo
duty
cycle
on
flood gu
n
accelerator
(pulse-on time one tenth
of
pulse-off
time).
NOTE
A h
igher
duty
cycle
can be used to in-
crease
brightness, but store time may
be degraded.
i.
Change
pulse polarity to negative; press and
release ERASE
pushbutton.
j. Momentarily
change
pulse polarity to positive;
then back to negative
and
immediately press STORE
pushbutton.
k. Wait 15 minutes. Observe that dot pattern
as written
in
step
j is visible
over entire
CRT viewing
area except for
small
amount of a
llowable degra-
dation
on outer
0.5 div,
and
has not
faded
positive
or
negative.
(l)
Fades positive: repeat writing rate
adjust-
ment
pr
ocedure
(paragraph
5-75)
by adjusting write
depth
adj
A5Rl8B
s
lightly cw. Then repeat store time
adjustment procedure.
(2)
Fades negative: Repeat writing
rate ad-
justment procedure
(paragraph 5-75)
by adjusting
write depth
adj
A5Rl8B
slightly ccw.
Then repeat
store time adjustment
procedure.
5-83.
Z-
AX IS
AMPLIFIER
RISETIME
ADJUST-
MENT.
5-84.
Reference.
Schematic
7,
table
5-1, and fig-
ure
5-4.
.?-H.5.
f;quipmenl.
a. Pulse
generator.
b. Oscilloscope.
c.
Sine wave
generator.
d.
50:1
divider probe.
5-10
Model 1331A
S-Hfi.
Procedure.
a.
Turn LINE
switch
to off.
b.
Disable high voltage power
supply
by dis-
con
necting collector lead to Q5
(bl
uw wire to
A3).
c.
Set LINE
switch
to ON.
cl.
Set
Model
1331A
controls as
follows:
STORE
.................
.
...........
.
....
m
INTENSITY
. . . . .
. . .
. . . . . . . . . . . . . . . . . . .
ccw
PERSISTENCE.
. . . . . . . . . . . . .
.
. . . . . . . . .
ccw
POSITION (HORIZ
and
VERT)
.
.
.
.
centered
e.
Set
pulse
generator controls
as
follows:
repetition
rate...
.
..................
500
kHz
pulse width
. . . . .
.
. . . .
.
. . . . . . . . .
.
. . . . .
1 usec
pulse
polarity
.
.
. . . . . . . . . . .
.
. . .
.
. . . .
positive
pulse
amplitude.
.
.
. .
.
. . . . . . . . . . .
.
<0.25V
p-p
f. Apply
output
of
pulse generator
to Z
INPUT.
g.
Use
50:1
divider probe
to connect oscillo-
scope
to intensity
gate output (collector
of A3Ql0).
h. Increase
output
of pulse
generator
until in-
tensity gate output (as
monitored
on oscilloscope)
is 25V p-p.
i.
Set
intensity
gate
bandwidth
adj
A3Cl9
so
that
risctime
of
intensity
gate output
is less than
70
ns
and
overshoot
is
less than 0. 75V.
5-87.
CALIBRATING MODIFIED
INSTRU-
MENTS.
5-88.
The following procedures
are
provided
as a
guide to
the
calibration of instruments
that have
been modified
according to the
instructions in
Section
II. The procedures
are general in
nature because of
the large number
of
input
attenuator combinations
possible.
5-89.
PHASE
SHIFT.
5-90.
Bypass the
attenuators and
perform the phase
shift adjustment of paragraph
5-71.
Perform the
com-
pensation adjustments described in paragraph
5-91.
Check phase shift again
with
attenuators
in the
cir-
cuit.
If necessary, make small
compromising adjust-
ments
of
the
attenuators,
dividing the
adjustments
as even ly as possible
between x
and y.
5-91
.
ATTENUATOR
COMPENSATION.
5-92.
In order to maintain the frequency response
characteristics of
Model 1331A, it is necessary to
com-
)
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