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Performance
Check
Remove the record
and
file
it for
future reference.
Be s
ure to
enter the
instrument serial number on
the
record for identification.
5-8.
MODE AND ERASE
CHECKS.
5-9.
Specification.
Model 1331A
shall operate
in
write
and store
modes.
The
erase
function
shall com-
pletely obliterate any
display in write mode. The
erase
function
shall
have no
effect
in
store
mode.
5-10.
Equipment.
None.
5-
11.
Procedure.
a.
Set
Model
1331A
con tr
ols
as
follows:
STORE..
.
...............................
In
INTENSITY..
..
.
.........
.
............
ccw
PERSISTENCE
. .
.
.
.
.
. .
. .
.
. . .
.
.
.
.
. .
.
.
. .
CCW
POSITION
(HORIZ and
VERT)
. . . .
centered
b. Turn INTENSITY
cw,
then
ccw.
No display
dot shall appear on CRT.
c.
Press WRITE pushbutton.
d. Turn INTENSITY
cw
until display dot
appears.
e. Use
HORIZ
and
VERT POSITION
CON-
TROLS
to move dot
all around CRT.
Dot
shall
leave
bright
trace that
slowly fades.
f. Repeat step
e and
immediately press STORE
pushbutton. Trace
shall
remain
on CRT
for
at
least
15 minutes
with no discernable degradation,
except
for small amount of allowable
degradation
on
out-
side 0.5
div
of viewing area.
g.
Press
a
nd release ERASE PUSHBUTTON.
There
shall
be no effect
on
display.
h. Press WRITE pushbutton.
i.
Repeat
step e and immediately
press
ERASE
pushbutton. Display
shall
be
completely erased.
5-12.
DEFLECTION
CHECKS.
NOTE
The
deflection checks
apply
to instru-
ments
whose
input
attenuators
have not
been modified as described in Section
II.
5- 13.
Specification. A 1 V p-p
signal
at
the X
INPUT
shall cause
a
10-div (±3%)
h orizon tal
deflec-
5-2
Model 1331A
tion on the CRT.
A
l V p-p signal
a
t
the
Y INPUT
shall cause an
8-div
(±3%)
vertical deflection.
5- 14.
Equipment.
Square wave generator.
:i-16.
Procedure.
a.
Set Model 1331A
controls as follows:
WRITE..
....................
.
..
.
.
..
.....
In
INTENSITY
.
. .
.
.
.
. .
. . . .
. .
. . . . . .
as
required
PERSISTENCE
. .
.
. . .
.
.
.
.
.
.
. .
. . . . .
. .
.
.
.
ccw
POSITION
(HORIZ and
VERT). . . .
centered
b.
Connect
1-kHz 1 V p-p
square
wave from
square
wave generator to X INPUT.
CRT
deflection
shall
be 10 div
±0.3
div.
c.
Move output
of square
wave generator to Y
INPUT.
CRT
deflection
shall
be
8
div
±0.24
div.
d.
If
necessary,
perform
gain adjustment
(para-
graph
5-67).
5-16.
PHASE SHIFT
CHECK.
5-
17.
Specification.
Phase
shift
between
the
x-
and
y-axis amplifiers shall be
less than
1 degree at
500
kHz.
5-18.
Equipment.
Sine
wave
generator.
5- 19. Procedure.
a.
Set Model 1331A controls
as
follows:
WRITE
.
.
....
.
...........................
m
INTENSITY
.
.
. . . .
. .
. . . . . .
. . .
.
. .
as
required
PERSISTENCE.
. .
.
. . . .
.
.
. . . .
. . . . .
.
.
. . .
CCW
POSITION (HORIZ and
VERT). . . .
centered
b.
Apply
500
kHz,
1
V p-p
sine
wave from
out-
put of
-sine wave
generator to
both
X
INPUT and
Y
INPUT.
Separation of resultant
ellipse at
center
screen
s
hall
not
exceed
1.2 minor
div
(see
figure
5-1).
c.
If necessary perform phase
shift adjustment
(paragraph 5-71).
5-20.
COMMON MODE REJECTION RATIO (CMRR)
CHECK.
5-21.
Specification.
The
rejection ratio
of
the x-
and y-axis amplifiers shall
be at least 40 dB for a
common-mode
differential-input
signal
equal
to
or
less than
3V
p-p with frequency
equal
to
or
less
than 10 kHz.
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