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Model 1331A/Option H72
X-Axis and Y-Axis Attenuator Adjustment.
a. Apply 2.5 V p-p, 10 kHz square-wave to X-Axis INPUT.
b. Adjust AlC44 to eliminate tails on dots.
c. Adjust X-Axis
Gain
adjustment to
give
7.57 divisions
horizontal deflection.
d.
Remove square-wave from X-Axis and apply to Y-Axis
INPUT.
e.
Repeat steps b and c, adjusting AlC45 and
Y
Gain
adjust.
f.
Remove square-wave from Y INPUT.
Z-Axis Adjustments.
a.
Adjust Intensity Limit as in manual.
b.
Disable high voltage oscillator, monitor gate output
voltage.
c.
Note that INTENSITY controls gate output over its
full range (+l V to
+43
V).
d.
Disconnect +2 V de from Z INPUT.
e.
Note that INTENSITY control cannot raise gate out-
put
above
+5 V.
f.
Reapply +2 V to Z INPUT, enable
high
voltage oscillator.
Tests for
Program
Functions.
(Instrument is operational.)
1.
Deflection
Blanking.
a.
Ground J4, pin 4.
Note that spot
~an
be positioned
by front panel controls.
b. Apply signal > +2 V de
<
+5 V
de
to pin
4.
c.
Check that front panel controls cannot move trace
back on screen.
d.
Apply square-wave of 0 V to+ 2 V, 1 kHz to J4,
pin
4.
e.
Increase output of square-wave
generator
slowly to
250 kHz.
-
f.
Observe that spot moves less than
one spot
diameter at
frequencies up to 250 kHz.
(A tail
will be
seen on
the spot as trace is
deflect~d,
but the spot itself
does not appear to move.)
g.
Remove
input to J4, pin 4.
2.
Remote Erase.
a. Apply> +2 V
<
+5 V to J4, pin 1.
b.
Note that CRT of instrument under test is erased.
c.
Remove input to J4, pin 1.
Pa9e 3
of 8
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