HP 8568B Performance Tests And Adjustments Manual page 157

Discharge Procedure
for High Voltage and
CRT
Warning
Warning
2. High-Voltage Adjustment (SN 3004A and Above)
16. With the front-panel INTENSITY control fully counter clockwise,
wait approximately 10 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 AlA6R103 HV ADJ for a DVM indication equal to
voltage determined in step 15.
18. If a new CRT has just been installed do
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 AlA6R103 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 AlA3TP2A.
22. Replace the cover on the AlA High-Voltage Regulator Assembly.
23. The High-Voltage adjustments are now completed. If
assembly has been repaired or replaced, perform adjustment
procedure 3, "Preliminary Display Adjustment (SN 3004A and
Above)", and then adjustment procedure 4, "Final Display
Adjustments (SN 3004A and Above)". If the AlA assembly
functions properly and does not require compensation, proceed
directly to adjustment procedure 4, "Final Display Adjustments
(SN 3004A and Above)".
The High-Voltage Adjustment procedure does not require the removal
or discharge of the Al A3 High-Voltage Regulator or AlVl CRT
assemblies. However, if for any reason the AlA High Voltage
the
Regulator Assembly, CRT, or the CRT post-accelerator cable must
be removed, perform the following procedure to ensure proper safety.
This procedure should be performed by qualified personnel only.
Voltages are present which, if contacted, could cause serious
personal injury. Approximately -2400 V dc can be present on the
cord is disconnected. The CRT can hold a + 9500 V dc charge
for several days if the post-accelerator cable is improperly
disconnected.
1. Remove the ac line cord from both instrument sections.
With the ac power cords disconnected, voltages can still be
present which, if contacted, could cause serious personal injury.
2. Obtain an electrician's screwdriver which has a thin blade at least
eight inches long. The handle of the screwdriver must be made of
an
insulating material.
the
following:
the
MAINS power-on indicator
Adjustments 3-43
the
the