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1. High Voltage Power Supply Adjustment
Equipment
Digital multimeter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . HP 3456A
DVMtestleads
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 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. Turn the spectrum analyzer off by pressing
LuNE].
Disconnect the power cord and
remove the spectrum analyzer cover. Fold down the A2 controller, A3 interface, A4 log
amplifier/Cal oscillator, and A5 IF assemblies. Remove the A6 power supply cover.
2. Position the spectrum analyzer as shown in Figure 2-l. Connect the positive DVM lead to
A6TP405
and the negative DVM lead to
A6TP401.
3. Set the HP 3456A controls as follows:
Function
....................................................
DCVOLTS
Range
.....................................................
1OOOVOLTS
4. Reconnect the power cord to the spectrum analyzer and press
m
to the on position.
5. Record the voltage marked on the
A6Al
HV module.
Voltage marked on A6Al HV Module
=
Vdc
6. Adjust A6R410 HV ADJ for a voltage equal to the voltage recorded in step 5.
7. Press
ILINE)
to turn the spectrum analyzer 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.
2-14 Adjustment Procedures