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Model 3585A
7-2
Schematic Drawings 7-2a/b/c and Replaceable Parts Table 7-2 show the circuit and part dif
ferences respectively. Schematics and parts tables are located at the end of this manual sec
tion.
7· 1 0. Procedures
For the serial numbers listed, these IF Adjustment procedures should be followed.
NOTE
Before performing these adjustments, check that the IF Input
Level adjustment (A llR105) is properly set. See Paragraphs
5-26i11.
7 · 1 1 . Preliminary IF Filter Adjustment
These procedures establish a reference that must be used for the IF Filter Adjustments. The
reference signal will be stored in Display Register B.
Note
Do NOT turn the instrument power off during IF Filter Adjust
ment procedures. To do so will cause the adjustment reference to
be lost.
The preliminary procedures must be performed prior to adjusting any IF stage .
a. Turn the -hp- 3585A power off and remove the A-l l , A-12, and A- 1 3 aluminum cover.
Place the A-1 3 Board on a PC Extender.
b. Turn the -hp- 3585A power on.
c. Place jumper A13J1 to the "T" position.
NOTE
Component locators for the IF Filter Boards (A-ll/A-13) are in
Drawings 7-2a/b/c.
d. Set the synthesizer to:
FREQUENCY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 350kHz
AMPLITUDE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . - 2.0dBm
e. Disconnect the cable connector from Al 1 1 1 .
f. Connect the synthesizer output through a 50n termination to Al 1 1 1 .
g . Set the -hp- 3585A to:
RECALL
609
INSTRUMENT PRESET
CENTER FREQUENCy . . . . . . . . . . . . . . . . . . . . . . . . . . . . 350kHz
CF STEP SIZE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 .3Hz
RES BW . . .
.
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
.
. . . . .
.
. .
r=sJ [QJ]
RES BW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3Hz
dB/DIV . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . I dB
MANUAL SWEEP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . on
CLEAR A
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