HP 8568B 1.Low-VoltagePower Supply Adjustments, Procedure IF-DisplaySection, 1. Low-VoltagePower Supply Adjustments

1.Low-Voltage Power Supply Adjustments

Reference

1. Low-Voltage Power Supply Adjustments

IF-Display Section:

AlA f15 V Regulator

AlA + 120 V, +5.2 V Regulator (Serial Number Prefix 3004A and above)

AlA + 100 V, +5.2 V Regulator (Serial Number Prefix 3001A and below)

RF Section:

A24 Voltage Regulator

Description 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

DIGITAL VOLTMTER

ADAPTER

(+)

Equipment

Procedure IF-Display Section

Note

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 AlABDSl (red LED) in the IF-Display Section should be lit. See 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 3004A and above.

3. Verify that the + 15 V indicator AlAGDSl (yellow LED) is lit.

Adjustments 3-25