HP 8568B, Performance Tests And Adjustments Manual, Page: 229 / 313

16. Second IF Amplifier and Third Converter Adjustment
Note
Place the Markers as accurately as possible within the cursor markers
for maximum frequency accuracy.
Note
Third Converter
Adjustment
18. On the synthesized sweeper, press should read
between 7 and 14 MHz.
19. On the synthesized sweeper, press OFF and OFF.
20. Set the synthesized sweeper FREQUENCY MARKERS to 251.4
MHz and to 351.4 MHz.
21. Set the Scalar Network Analyzer to 10 and set
(REF LEVEL) to + 14 Set the REF POSN to one division down
from the top.
22. Adjust for minimum amplitude response at 258.4 MHz.
Refer to Figure 3-64 for the location of the adjustments.
Refer to Figure 3-66 for the typical response when the
filter is properly adjusted.
2 8 0
Figure 3-66. Minimum Image Response at 258.4 MHz
23. Repeat the adjustments in steps 13 and 22 to assure that the
is between 7 MHz and 14 MHz and the image response
at 258.4 MHz is minimized.
Remember to use the appropriate set up for steps 13 and 20.
24.
25.
26.
27.
28.
Disconnect the cables from and and reconnect the
instrument cables.
Disconnect cable 83 (gray/orange) from and connect
to the input of HP Spectrum Analyzer, using a BNC to
SMB test cable.
Press
PRESET
)
on the HP Spectrum Analyzer, then
key in
[
CENTER FREQUENCY
)
280
MHz,
[
FREQUENCY SPAN
)
2
MHz. Set
MARKER + 2 and
[
ENTER
1
Adjust AMPTD for maximum signal level as indicated
on spectrum analyzer display.
Disconnect spectrum analyzer and reconnect cable 83
(gray/orange) to
Adjustments 3-115