HP 3562A Service Manual page 132

ADJ USTM E NTS
NOTE: The A1 8 board
runs the le ngth of the in­
stru ment underneath the
display, and is accessed
from below by removal of
the bottom cover.
R1
Figure 3-1 Power supply component locator (A 1 S)
Description:
3-5 20.48 MHz REFERENCE ADJ USTMENT
This procedu re adjusts the 20.48 M H z freq uency reference circuit on the trigger board
(A31 ). This circuit is the source of the tim ing reference for the ADC boards (A33), the local
oscillator (A4) and the main powe r su pply (A1 8).
Equ ipment Req u i red:
Freq uency Standard . . . . . . . . . . . . . . . . . . . . . . . 10 MHz Freq Stand ard
Freq uency cou nter . . . . . . . . . . . . . . . . . . . . . . . . H P 5351 B
1 :1 scope probe . . . . . . . . . . . . . . . . . . . . . . . . . . . H P 1 0083A
3-4
A22
TP1 2
Board
Location
Key
MODE L 3562