Keysight NFA Series Noise Figure Analyzers Service Guide 65
Boot Up and Initialization Troubleshooting
Potential Problems During Boot Process
E Cal Path System Gain Algorithm
Measures the amplitude error of the low band signal
path by injecting the 50 MHz E-Cal signal into the A13
Front End assembly. The E-Cal signal originates on the
A16 Reference assembly.
Signal path from A13
Front End to A3 Digital
IF
A16 Reference may not be
providing 50 MHz E-Cal
Low Band Nominal Path System Gain
Algorithm
Aligns low band (3 Hz to 3.6 GHz path) with preamp
OFF. Dependent on successful E-Cal alignment.
Input attenuators set to 10 dB and DC coupled.
A13 Front End 50 MHz calibrator on A16
Reference.
A9 and A10 Input attenuators
Low Band Preamp Path System Gain Algorithm
Aligns low band (3 Hz to 3.6 GHz path) with preamp ON.
Input attenuator set to 20 dB.
(Options Pxx)
A13 Front End 50 MHz calibrator on A16
Reference.
A9 and A10 Input attenuators
Preselector Two Point Tuning Algorithm
Aligns the YTF preselector centering near the maximum
and minimum frequency points of the YTF.
Uses the high band preamp noise as stimulus signal.
A12 YTF Preselector
or
A15 Front End
Controller
or
All Low Band
A13 Front End
High Band Nominal Path System Gain
Algorithm
Anything in Band 1
signal path
4800 MHz calibrator on A16
Reference
High Band Preamp Path System Gain
Algorithm
Measures change in signal level with high band preamp
turned ON and OFF.
Input attenuator set to 30 dB.
(Options P07, P13, P26, P32, P44)
A11 Low Band Switch 4800 MHz calibrator on A16
Reference
A9 and A10 Input attenuators
A15 Front End Controller
Burst Carrier Trigger Curve Fit Algorithm
Detects the level of the signal envelope before filtering
at the 22.5 MHz IF, and compares that detected level
against the trigger threshold DC level.
A2 Analog IF
Trigger Interpolation A3 Digital IF
DIF 25 Pulse Stretcher Alignment Algorithm A3 Digital IF
Table 2-1 Initial Alignments
Alignment Description Most Probable
Hard ware Failure
Related Hard ware
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