Sampling Oscillator Adjustment; Sampler Adjustment Setup - HP 8560A Service Manual

6. Sampling Oscillator Adjustment

Assembly Adjusted
Al5 RF Assembly
Related Performance Test
There is no related performance test for this adjustment procedure.
Description
The phase detector bias is adjusted for 1.8 Vdc. The sampling oscillator tank circuit is
adjusted for a tuning voltage of 0.9 Vdc when the oscillator is set to 288 MHz. The voltage
monitored is actually the tuning voltage divided by 4.05. A coarse-tune procedure is also
included, but should only be necessary when the coaxial resonator is replaced. The power and
match of the sampling oscillator signal to the A15A2 Sampler are also adjusted.
D I G I T A L V O L T M E T E R
Equipment
An asterisk (*) indicates equipment used only for the coarse-tune procedure.
Digital Voltmeter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
DVM Test Leads . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Frequency Counter* . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Active Probe* . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Power Supply* . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1 MR Resistor* . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Adapters
Type BNC (f) to BNC (f)' . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1250-0059
Cables
Figure 2-8. Sampler Adjustment Setup
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . HP 10503A
6. Sampling Oscillator Adjustment
SPECTRUM ANALYZER
BOARD
P R O P
HP 3456A
HP 34118A
HP 5343A
HP 1121A
HP 6114A
0757-0080
Adjustment Procedures 2-33
S K 1 7