
3. Preliminary Display Adjustments (SN 3004A and Above)
29. Set the oscilloscope controls as follows:
Press
(ZiZi):
Channel 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . on
amplitude scale . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
.8.00
V/div
Press
(SHOW].
30. Adjust the spectrum analyzer front-panel INTENSITY control for
50 V peak-to-peak (6.25 divisions) as indicated on the oscilloscope.
See Figure 3-29.
hp
running
..!..
1,
I
.I,
.$
..p
I
.$
.p
.:.
;
,..,_.............................................
-.
.._.................._......................
i
..~..~.................~.....~....~.~~.
-
-125.000 “s
125.000
“s
375.000 “5
50.0
“s/div
Figure 3-29.
5OV,,
Signal
1
8.00
V/div
offset:
45.00 v
10.00
:
1
dc
1
f
50.00 v
31. Adjust
AlA2R308
HF GAIN and
AlA2C307
for minimum
overshoot on rise and minimum rise and fall times of the pulse
waveform.
32. Use the oscilloscope
Intav]
markers to measure the risetime,
falltime, and percent overshoot of the pulse waveform. Rise
and falltimes should be less than 50 ns and 90 ns respectively.
Overshoot on the rise should be less than 5% (approximately 0.4
divisions).
33. Set the spectrum analyzer LINE switch to STANDBY.
34. Disconnect the oscilloscope channel 1 probe from the spectrum
analyzer. Remove the Display Adjustment PC board from the
A3A2
slot, and reinstall the
A3A2
Intensity Control Assembly.
Replace the A3 Section cover and cables.
35. Reconnect the black connector with three wires (8, 98, and 96) to
AlA2J5, and set
AlA2R319
INT GAIN approximately two-thirds
clockwise.
36. Perform Adjustment Procedure 4 Final Display Adjustment (SN
3004A
and Above).
3.62
Adjustments
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