HP 8568B Performance Tests And Adjustments Manual page 240

Spectrum analyzer
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19. Second Converter Adjustments
Second Converter
Adjustments
Note
3-126 Adjustments
27. Key in
28. On the synthesized sweeper, key in ICF) 240 MHz, a 50 MHz,
and CPowerLeVel] - 10 dBm.
29. Connect the synthesized sweeper's SWEEP OUTPUT (rear panel),
Z-AXIS BLANK/MKRS (rear panel), and PULSE MODULATION
INPUT (front panel) to the proper rear-panel connectors on the
scalar network analyzer as shown in Figure 3-73.
30. On the scalar network analyzer, press PRESET, turn channel 2 off,
and press [MEAS] (A/R).
31. Connect the synthesized sweeper's output to the power splitter as
shown in Figure 3-72.
32. Connect one arm of power splitter to scalar network analyzer R
input. Connect other arm of power splitter to A input, using a
BNC to SMB snap-on test cable and necessary adapters.
33. Set the scalar network analyzer c-1 to 1 dB, and set m (REF
LEVEL) to -16.00 dB. Set REF POSN (press REF POSN) to the
fourth division from the bottom using the data knob.
34. On the synthesized sweeper, press
Set
35. Adjust REF LEVEL for a mid-screen response of the bandpass
signal on the scalar network analyzer.
36. Connect the test cable from the power splitter output arm to
37. Connect cable 80 (gray/black) from A23A3J6 (PILOT 2ND IF) to
the scalar network analyzer's A input. Set Cm] to 10 dB/DIV.
38. On the spectrum analyzer, key in [SHIFT] (FREERUN)V.
Hold (SHIFT] in until the LED lights, then press I-) until the
sweep is free running.
39. On the synthesized sweeper, set (CF) for a frequency of 2017.6
MHz and InF] to 50 MHz.
40. Adjust a on the synthesized sweeper to center the bandpass
signal.
41. Adjust A23A3 25, Z6, 27, and L4 for best bandpass shape and
flatness at maximum amplitude of signal displayed on Scalar
network analyzer. A typical properly-adjusted bandpass filter
response is shown in Figure 3-74. See Figure 3-73 for location
of adjustments. The bandpass filter response at the 3 dB points
should be 222 MHz. See Figure 3-74 and Figure 3-75 for a typical
PILOT 2ND IF bandpass response for a SHIFT LO 1 and a SHIFT
LO 1.
0 Hz.
]
FREQUENCY SPAN
(ON),
to 500 ms.
and
),
SWEEP

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