Fourth Crystal Stage Adjustment - HP 3585A Service Manual

Model 3585A
h. Adjust A 1 9C41 for the best possible trace symmetry.
5·22. Fourth Crystal Stage Adjustment
a. DO NOT TURN THE 3585A POWER OFF. Remove the A19 board. Move test
j umper A 1 91 1 to the "OP" position and test jumper A 1 9J2 to the "T" position. Reinstall
A 1 9 Board in instrument.
b. Set the 3585A controls for:
FREQUENCY SPAN . . . . . . . . . . . . . . . . . . . . . . . . 1 KHz
RES BW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 300Hz
dB/DIV . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . I dB
A-B . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . on
c. Adjust A1 9C66 so that the A trace approximates a straight, horizontal line.
MARKER 350 273. .. Hz
REF -27. 2 de..
10 dB/DI Y RANGE -25. 0 dBm
0
0
0
0
0
0
0
0
o
+
- - - - - - - - - - - - - - - -
- - -
4
CENTER 350 273. Hz
RBW 300 Hz YBW 1 KHz
Figure 5·30. Unsymmetrical IF Display
MARKER 350 273. 4 Hz
REF -27. 2 de..
10 dB/D I Y RANGE -25. 0 dBm
0
0
0
0
0
0
0
0
-
0
0
+
- - - - -
- - - - -
CENTER 350 273. 4 Hz
RBW 300 Hz VBW 1 KHz
Figure 5·3 1 . Symmetrical IF Display
-28. 5 de..
- - - - - - - - -
SPAN 50 000. 0 Hz
ST 4. 8 SEC
-28. 5 dBm
- - -
-
- - - - -
SPAN 50 000. 0 Hz
ST 4. 8 SEC
Adjustments
5-39