Fourth Lc Stage Adjustment; Offset - HP 3585A Service Manual

Adjustment s
d. Set the 3585A controls for:
e. Adjust A 1 9C30 for the best possible trace symmetry.
5·23. Fourth LC Stage Adjustment
a. DO NOT TURN THE 3585A POWER OFF. Place the A 1 9 board on a PC extender.
b. Move test jumper A 1 9J2 to the "OP" position and test jumper A 1 9J3 to the "T" posi­
tion. Check that A19J4 is in the "OP" position.
c. Enter the following 3585A keyboard settings:
d. Adjust A 1 9L5 so that the A trace approximates a straight, horizontal line.
e. Set the 3585A controls for:
f. Allow a complete sweep to occur, then press ENTER OFFSET.
g. Enter a RES BW of 1 KHz on the 3585A.
h. Adjust A1 9R28 so that the marker amplitude reading equals .OOdB.
5-40
A-B . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . " . . . . . . . . . off
FREQUENCY SPAN . . . . . . . . . . . . . . . . . . . . . . . 50KHz
dB/DIY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10dB
RES BW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . I KHz
FREQUENCY SPAN . . . . . . . . . . . . . . . . . . . . . . 3 . 3KHz
dB/DIy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . I dB
A-B . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . on
A-B . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . off
RES BW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30KHz
OFFSET . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . on
REF -25. 2 dBm
1 dB/O I V RANGE -25. 0 dBm
- - - - - - - - - - - - - - - - - - - -
CENTER 350 289. 6 Hz_
RBW 30 KHz VBW 30 KHz
Figure 5·32. LC Stage. 30kHz AmplitudEI Reference
dEI
OFFSET . 0 Hz
. 00
i
- - - - - - - - - - - - . - - - - - - - -
SPAN " 300. 0 Hz
ST . 8 SEC
Model 3585A