HP 3585A Service Manual page 236

Model 3585A
b . Set the -hp- 3585A to:
OFFSET . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . off
FREQUENCY SPAN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 . 3kHz
dB/DIV . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . I dB
A-B . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . on
c. Adjust A 1 3L4 so that the trace approximates a straight, horizontal line. (See Figure
7-3 .)
d . Set the -hp- 3585A to:
A-B . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . off
RES BW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30kHz
OFFSET . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . on
ENTER OFFSET
RES BW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 kHz
e. Adjust A 1 3 R20 for a .OOdB marker amplitude.
f. Place jumper A 1 3 J4 to the "OP" position.
g. DO NOT TURN POWER OFF. Remove the A- 1 3 Board and the PC Extender. Install
the A- 1 3 Board into the card nest.
7 · 1 6. Third Crystal Stage Adjustment (A· 1 2: L6, L4, and C24)
a. DO NOT TURN POWER OFF. Place th A-1 2 board on PC Extender.
I f the B trace has been lost or altered, repeat the Preliminary Ad­
justment procedures to re-establish the reference trace.
b. Check that the B trace is still intact.
c. Set the -hp- 3585A to:
OFFSET . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . off
CF STEP SIZE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 .2Hz
RES BW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
RES BW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 300Hz
FREQUENCY SPAN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . l kHz
dB/DIV . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . I dB
d. Adjust A 1 2L6 for a maximum marker amplitude.
e. Set the -hp- 3585A to:
A-B . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . on
(allow one complete sweep)
NOTE
Scans by ARTEK MEDIA =>
Backdatin g
[QJ] [2]
7-7