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Focus and Intensity
Adjustments
2. High-Voltage Adjustment (SN 3001A and Below)
If the calibration factor calculated in step 8 is 0.00099, and
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
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.
19. Set the LINE switch to STANDBY. Remove the ac line cord from
each instrument section.
20. Wait at least one minute for
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
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.
channel 1, and use the front-panel knob to select a 1O:l probe.
26. Set the oscilloscope controls as follows:
Press [CHAN):
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . on
Channel 1 . . .
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
has
just been
the
MAINS power-on indicator
the
Display
Adjustments 3-33
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