HP 8560A Service Manual page 47

Spectrum analyzer
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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
3. Set the HP 3456A controls as follows:
FUNCTION
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . DCVOLTS
RANGE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1OOOVOLTS
4. Reconnect the power cord to the HP 8560A and set the @ switch on.
5. Record the voltage marked on the A6Al HV Module.
6. Adjust A6R410 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 A6TP401 and A6TP405. Reinstall the power supply
cover.
1. High-Voltage Power Supply Adjustment
Voltage marked on A6Al HV Module =
Adjustment Procedures 2- 13
Vdc

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