Low-Voltage Power Supply Adjustments - HP 8568B Performance Tests And Adjustments Manual

1. Low-Voltage
Power Supply
Adjustments
Reference
Description
Equipment
Procedure
IF-Display Section
Note
IF-Display Section:
above)
below)
RF Section:
The + 15 V supply is adjusted for the IF-display Section, and the +20
V supply is adjusted for the RF Section. All other low-voltage supplies
are measured to ensure that they are within tolerance.
SPECTRUM ANALYZER
Figure 3-l. Low-Voltage Power Supply Adjustments Setup
Digital Voltmeter (DVM) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . HP 3456A
1. Position the instrument on its right side with the IF-Display
Section facing right, as shown in Figure 3-1. Remove the top
cover of the IF-Display Section and the bottom cover of the RF
Section.
2. Set the LINE switch to ON and press (Ip). Mains indicator
Figure 3-2 and Figure 3-3 for the location of AlABDSl.
Use Figure 3-2 for IF-Display Sections with serial numbers 3001A and
below. Use Figure 3-3 for IF-Display Sections with serial numbers
3. Verify that the + 15 V indicator AlAGDSl (yellow LED) is lit.

1. Low-Voltage Power Supply Adjustments

DIGITAL VOLTMTER
ADAPTER
Adjustments 3-25