14. External Mixer Bias Adjustment

14. External Mixer Bias Adjustment

Assembly Adjusted

Al5 RF Assembly

Related Performance Test

There is no related performance test for this adjustment procedure.

Description

A voltmeter is connected to the HP 8560A IF INPUT with the external mixer bias set to off. The bias is adjusted for a 0 Vdc output.

D I G I T A L V O L T M E T E R

ADAPTER

SPECTRUM

A l 4ANALYZER kRD

F R E Q U E N C Y /PROP ^ ^ - - ^

A l 5 R F

 

SK1 1 6

 

Figure 2-17. External Mixer Bias Adjustment Setup

Equipment

DVM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . HP 3456A

Adapters

Type BNC (f) to SMA (m) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1250-1200 Type BNC (f) to dual banana plug . . _ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1251-2816

Cables

BNC,122 cm(48in) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . HP 10503A

Procedure

1.Set the HP 8560A (LINE) switch off and disconnect the ac power cord. Remove the analyzer cover and connect the equipment as illustrated in Figure 2-17. Reconnect the power cord and set the (LINE) switch on.

2.Set the HP 3456A controls as follows:

FUNCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . DCVOLTS R A N G E . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . O . l V RESOLUTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..lOOmV

Adjustment Procedures 2-55