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2. High-Voltage Adjustment (SN 3001A and Below)
If the calibration factor calculated in step 8 is 0.00099, and
AlA3Tl
is labeled for -3875 V, then adjust AlA6R32 HV ADJ for
a DVM indication of:
0.00099 x (-3875 V) = -3.836 V dc
16. With the front-panel INTENSITY control fully counterclockwise,
wait approximately 30 minutes to allow the high-voltage supply to
stabilize and the CRT to normalize. This
sofl turn-on will extend
CRT life expectancy, particularly if a new CRT has just been
installed.
17. Readjust
AlA6R32 HV ADJ for a DVM indication equal to the
voltage determined in step 15.
18. If a new CRT has just been installed do the following:
a. Set the front-panel INTENSITY control so the CRT trace is
barely visible.
b. Wait an additional 30 minutes for the CRT to normalize.
c. Readjust
AlA6R32 HV ADJ for a DVM indication equal to the
voltage determined in step 15.
Focus and Intensity
19. Set the LINE switch to STANDBY. Remove the ac line cord from
Adjustments
each instrument section.
20. Wait at least one minute for
the MAINS power-on indicator
AlA8DSl
(red LED) to go out completely before proceeding.
21. Disconnect the high-voltage probe from AlA3TP3.
22. Remove the
A3A2
Intensity Control Assembly from the IF-Display
Section and install in its place the Display Adjustment Board,
HP part number 85662-60088. Set the switch on
the Display
Adjustment Board in the “down” position. (This applies
approximately
+2.7
V dc to the front-panel INTENSITY control.)
23. Connect a calibrated
1O:l
divider probe to the oscilloscope
Channel 1 input.
24. On the oscilloscope, press (RECALL) (CLEAR) to perform a soft reset.
25.
On the oscilloscope, press
CCHAN],
more preset probe , select
channel 1, and use the front-panel knob to select a
1O:l
probe.
26. Set the oscilloscope controls as follows:
Press
[CHAN):
Channel 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . on
amplitude scale . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
lO.OV/div
offset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
..6O.OOOOV
coupling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
..dc
Press
@%KiZi@:
time scale
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
..50~s/div
Press
ITRIG):
EDGE TRIGGER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . auto, edge
source . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
..l
level . . . . . . . . . . . . . . . . . . . . . . . . . .75.0000 V, rising edge
Press
[DISPLAY):
connect dots . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
..on
Adjustments 3-33