HP 3585A Service Manual page 153

Adjustments
d. Press the REF LVL key of the Marker/Continuous Entry group. Using the Con­
tinuous Entry control, adjust the reference level until the peak of the A trace is equal in
amplitude to the peak of the B trace.
e. Set the 3585A controls for:
f. Adjust A 19C67 so that the A trace approximates a straight, horizontal line.
g. On the 3585A keyboard enter the following commands:
5-38
REF -27. 2 dB..
1 dB/D I V RANGE -25 0 dB..
- -
-
- - - - - - - - -
CENTER 350 273. 4 Hz
RBW 300 Hz VBW 1 KHz
Figure 5·28. Off·Center IF Stage. A·a Mode
MARKER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . , . on
A-B . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . on
SWEEP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . cont
dB/DIV . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . IdB
1
REF -27. 2 dB..
dB/D I V RANGE -25 0 dB..
- -
- - - - - - - - - - - - - - - - - -
CENTER 350 273. 4 Hz
RBW 300 Hz VBW 1 KHz
Figure 5·29. Correctly Adjusted IF Stage. A·a Mode
A-B . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . off
FREQUENCY SPAN . . . . . . . . . . . . . . . . . . . . . . . 50KHz
dB/Div . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . l OdB
MARKER 350 273. 4 Hz
-. 6 1 dB
- - - - -
- -
- -
- - - - - -
1
SPAN 000. 0 Hz
ST . 8 SEC
MARKER 350 273. 4 Hz
-. 62 dB
+ - - -
- -
-
- - - - - - - - - - - - - -
1
SPAN 000. 0 Hz
ST . 8 SEC
Model 3585A