HP 8560A, Service Manual

Page: 47 / 450

1. High-Voltage Power Supply Adjustment
Equipment
Digital Multimeter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . HP 3456A
DVM Test Leads . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . HP 34118A
Procedure
Warning After disconnecting the ac power cord, allow capacitors in the high-voltage
supply to discharge for at least 30 seconds before removing the protective
cover from the A6 Power Supply.
1. Set the HP 8560A (LINE) switch off, disconnect the power cord, and remove the analyzer
cover. Fold down the A2 Controller, A3 Interface, A4 Log Amplifier, and A5 IF assemblies.
Remove the A6 Power Supply cover.
2. Position the HP 8560A as shown in Figure 2-l. Connect the positive DVM lead to
and the negative DVM lead to
3. Set the HP 3456A controls as follows:
FUNCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . DCVOLTS
RANGE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4. Reconnect the power cord to the HP 8560A and set the switch on.
5. Record the voltage marked on the HV Module.
Voltage marked on HV Module =
Vdc
6. Adjust HV ADJ for a voltage equal to the voltage recorded in step 5.
7. Set the HP 8560A (LINE) switch off and disconnect the power cord. Wait at least 30 seconds
for the high-voltage power supply capacitors to discharge.
8. Disconnect the DVM test leads from and Reinstall the power supply
cover.
Adjustment Procedures 13