Keysight N8973B User Manual

Keysight NFA Series Noise Figure Analyzers Service Guide 63
Boot Up and Initialization Troubleshooting
Potential Problems During Boot Process
Table 2-1 Initial Alignments
Alignment Description Most Probable
Hard ware Failure
Related Hard ware
Pre-tune 1st L.O. DAC A14 L.O. Synthesizer A16 Reference board is not
providing correct 4.8 GHz signal
VCXO Tuning Curve
(Power up alignment only)
Measures the tuning voltage for the 100 MHz VCO at a
number of different frequencies.
Uses 10 MHz internal reference
A16 Reference
VCXO Loop Band wid th
Adjusts gain of the PLL loop amplifier.
Uses the 10 MHz internal reference
A16 Reference
Dither Level Algorithm
(4 measurements)
A3 Digital IF
AIF LC Wide Prefilter Passband Tuning
Algorithm
Adjusts the LC prefilter centering with the prefilter BW
set to about 1.12 MHz.
Uses 322.5 MHz Comb Calibrator on the A-IF.
A2 Analog IF
AIF LC Wide Prefilter Passband Fine Tuning
Algorithm
A2 Analog IF
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

Keysight N8973B Specifications

General

Brand	Keysight
Model	N8973B
Category	Measuring Instruments
Language	English