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Performance Check
c.
Turn LINE
switch
to ON.
d. Set
Model
1331A
controls as follows:
STORE.....
...
..........................
in
INTENSITY
. .
.
. .
.
.
.
.
.
. . .
.
.
. .
. . .
. .
.
.
. . .
CCW
PERSISTENCE.
.
. . .
. .
. . .
.
.
. . .
. .
.
. .
.
.
.
.
ccw
POSITION
(HORIZ and
VERT)..
..
centered
e.
Set pulse
generator
controls as
follows:
repetition rate
.........
.
.........
.
...
50
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
maximum. Amplitude
of pulse generator
output
shall be equal
to
or less
than 1 V
p-p.
i. Reduce
amplitude of
pulse
generator output
until
a mplitude of
intensity
gate
is just below
clipping.
Risetime and falltime of
intensity
gate output
pulse
shall
be
equal to or
less
than 70
ns,
with
leading
edge
overshoot
equa
l
to or
less than
0.75V.
j.
Set INTENSITY fully cw.
k.
Set
polarity
of
pulse
generator output to
negative.
I. Adjust
amplitude of
pulse
gen
erator output
until
negative
excursion of
pulse
at
intensity
gate
output just clamps. Amplitude of
pulse
generator
output
shall
be
equal
to
or less
than 1
V
p-p.
m.
Disconnect
pulse
generator from Z
INPUT.
n. Apply
50-kHz, 0.25V
p-p
sine
wave from
sine
wave generator to Z
INPUT.
o.
Adjust
amplitude
of sine
wave
output and
front panel
INTENSITY
control to obtain sine wave
at
intensity
gate output
that is
of maximum ampli-
tude with
no
clipping at top or
bottom.
Note am-
plitude of
intensity
gate
output.
p.
Increase
frequency of sine wave
generator
output
until
amplitude of sine
wave at intensity
gate
output
drops
to 70.7% of amplitude
noted in
step o.
Frequency
shall be
equal
to
or
greater than
5
MHz.
q. Turn Model
1331A off a nd
reconnect
col-
lector of
Q5
to
A3.
r.
If
n
ecessary,
perform
z-axis
amplifier risetime
adjustment
(paragraph
5-83).
5-4
Model 1331A
5-32.
ERASE TIME
CHECK.
5·33. Specification.
The
erase
function
of
Model
1331A can
be
accomplished
in
less
than 1
second.
This
is
assured
by verifying
th
at
the
erase
cycle
(T
on figure 5-2)
is
less
than 850
milliseconds.
.").:/-/.
Equipment.
a.
Oscilloscope.
b.
Pulse generator.
5-35. Procedure.
a. Set Model
1331A
controls as follows:
WRITE
.......
..
....
.
....
.
...............
1n
INTENSITY
. . . . .
.
. . . . .
.
.
.
.
.
. . . . . . . . . . .
ccw
PERSISTENCE.
.
. .
.
.
. . . .
.
. . .
.
. . . . . .
.
. .
CCW
POSITION
(HORIZ and
VERT)
....
centered
b.
Conn
ect oscilloscope to CRT storage
mesh
(white-yellow-violet wire on
A5).
c.
Press
and release (quickly) ERASE push-
button. Observe waveform similar
to
figure 5-2.
T
shall
be
equal
to
or
less
than 850
msec.
+
1
58
v
- - -
+3e5V
-
-
~
T
-.I
I
I
I
Fil{ure
5-2.
Erase Waveform
5-36.
DOT WRITING TIME CHECK.
1331A/C-A- 14
5-37.
Specification. Dot writing time shall
be
eqr.al
to
or
less than
4 microseconds.
This is
assured
by applying a 4 microsecond pulse to the X
INPUT
and
noting that dots
are written
during
pulse appli-
cation time.
5-38.
Equipment.
a. Sine wave generator.
b. Oscillator.
c.
Pulse generator.
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