N9030B PXA Signal Analyzer Service Guide 75
Boot Up and Initialization Troubleshooting
Potential Problems During Boot Process
AIF LC Narrow Prefilter Passband Tuning
Algorithm
Adjusts the LC prefilter centering with the
prefilter BW set to about 413 kHz.
Uses 322.5 MHz Comb Calibrator on the A-IF.
A2 Analog IF
AIF LC Narrow Prefilter Passband Fine Tuning
Algorithm
A2 Analog IF
AIF Xtal Wide Prefilter Passband Tuning
Algorithm
Adjusts Centering, symmetry and dip of the
crystal prefilter BW set to about 80 kHz
Uses 322.5 MHz Comb Calibrator on the A-IF
A2 Analog IF A3 Digital IF or
A16 Reference
AIF Xtal Narrow Prefilter Passband Tuning
Algorithm
Adjusts Centering, symmetry and dip of the
crystal prefilter BW set to about 13 kHz
Uses 322.5 MHz Comb Calibrator on the A-IF
A2 Analog IF
AIF Variable Gain Algorithm
The Gain of the Analog IF System is measured
and compared with the ideal gain value.
Several conditions are tested, Dither on/ dither
off, A-IF prefilter in and bypassed, alias filter
set wide and narrow.
Uses 322.5 MHz Comb Calibrator on the A-IF
A2 Analog IF
AIF Step Gain Algorithm
Measures the relative gain of the IF for high
gain (10 dB) verses the low gain (0 dB) paths. In
normal instrument operation these two states
can be controlled by the user interface key
called “Swept IF Gain”.
Uses the Comb calibrator on the A-IF
A2 Analog IF
LO Power Alignment Algorithm
Measure max LO power then backs off for each
band
A13 Front End
Assembly or A15
Front End Controller
Table 2-3 Initial Alignments
Alignment Description Most Probable
Hard ware Failure
Related Hard ware
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