HP 8568B, Performance Tests And Adjustments Manual, Page: 204 / 313

10. Step Gain and 18.4 MHz Local Oscillator Adjustments
1 Gain Step Checks
22. Key in
[
REFERENCE LEVEL
)
-19.9 Set step attenuators to 15
Press MARKER twice to establish a new reference.
23. Key in
(
REFERENCE LEVEL
)
-17.9 Set step attenuators to 13
24. MKR A level, as indicated by CRT annotation, should be .OO
If not, increase or decrease the value of Refer to
3-3 for range of values.
25. Key in
(
REFERENCE LEVEL
)
-15.9 Set step attenuators to 11
26. MKR A level should be .OO If not, increase or decrease
the value of Refer to Table 3-3 for range of values.
27. Key in
[
REFERENCE LEVEL
)
-11.9 Set step attenuators to 7
28. MKR A level should be .OO If not, increase or decrease
the value of Refer to 3-3 for range of values.
Gain Step Adjustment
29. Key in LIN, (SHIFT) (AUTO] (resolution bandwidth), and
(
REFERENCE LEVEL
)
-19.9 Set step attenuators to 13 Press
MARKER twice to establish a new reference.
30. Key in
[
REFERENCE LEVEL
)
-18.0 Set step attenuators to 11
31. Adjust VR for MKR A level of + 0.10 See Figure 3-49
for location of adjustment.
32. Remove all test equipment from the spectrum analyzer. Connect
CAL OUTPUT to RF INPUT.
18.4 MHz Local Oscillator Adjustment
33. Press
PRESET
]
and
34. Set front-panel FREQ ZERO control to midrange.
35. Adjust FREQ ZERO to peak signal trace on CRT. See
Figure 3-49 for location of adjustment.
Adjustments