76 N9030B PXA Signal Analyzer Service Guide
Boot Up and Initialization Troubleshooting
Potential Problems During Boot Process
AIF Variable Attenuator Algorithm
Measures the gain in all settings of the A-IF
1 dB step attenuator. A reference power is
measured with atten 4 dB
The Comb calibrator on A-IF is used to provide
a CW signal.
A2 Analog IF
AIF 140 Variable Gain Alignment Algorithm
(Option B1X)
The 300 MHz CW calibration signal on this WB
Analog IF assembly is used.
Searches for the DAC value that gives the
closest power level to the target level.
DAC value 0 gives the highest gain; value 255
gives the lowest gain
A25 Wideband A-IF
Mechanical Attenuator Algorithm
Measures the attenuation of all DC coupled,
and one AC coupled (10 dB) settings of the RF
input attenuators.
Reference atten setting is 10 dB
A9 and A10 RF
Input Attenuators
50 MHz calibrator on A16
Reference
Electrical Attenuator Algorithm
Each setting from 0 to 24 dB in steps of 1 dB is
measured. The reference condition is electrical
attenuator set to 0 dB and RF input attenuators
set to 10 dB. (Option EA3)
A13 Front End 50 MHz calibrator on A16
Reference.
Control signals from A15
Front End Controller
Electrical Attenuator Tail Algorithm
Attenuation set to 0 dB (Option EA3)
A13 Front End
LO Nulling Full Alignment Algorithm
Looks for optimum I and Q over large range
A13 Front End
LO Nulling Min Alignment Algorithm
Looks for optimum I and Q over small range
A13 Front End
LO Nulling Full MB Alignment Algorithm
MB = medium bandwidth
A13 Front End
LO Nulling Min MB Alignment Algorithm A13 Front End
LO Nulling Full WB Alignment Algorithm
WB = Wide Band (Option B1X)
A13 Front End
LO Nulling Min WB Alignment Algorithm A13 Front End
Table 2-3 Initial Alignments
Alignment Description Most Probable
Hard ware Failure
Related Hard ware
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