194 Keysight NFA Series Noise Figure Analyzers Service Guide
RF Section Troubleshooting (N8973B, 74B, 75B Analyzers)
Troubleshooting
IMPORTANT Turn off auto align by pressing System, Alignments, Auto Align, Auto Align,
Off.
Measure the 4.8 GHz calibrator signal on the output of A11J3 Low Band
Switch high band output port using a functioning Spectrum Analyzer. The level
should be −46 dBm ± 3 dB as shown in Figure 4-34. There is ~8 dB of loss
through the A11 Low Band Switch when using the 4.8 GHz reference signal.
Figure 4-34 4.8 GHz Calibrator Signal at Output of W8 Cable
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