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Functions and Measurements 3

N9320A Spectrum Analyzer 49

Notice the MarkerD amplitude readout. This is the difference

of the distortion product amplitude between 0 dB and 10 dB

input attenuation settings. If the MarkerΔ absolute amplitude

is approximately 1 dB for an input attenuator change, the

analyzer is generating, at least in part, the distortion.

The MarkerΔ amplitude readout comes from two sources:

1) Increased input attenuation causes poorer signal- to- noise

ratio. This causes the MarkerΔ to be positive.

2) The reduced contribution of the analyzer circuits to the

harmonic measurement causes the MarkerΔ to be negative.

Large MarkerΔ readout indicates significant measurement

errors. Set the input attenuator to minimize the absolute

value of MarkerΔ.

≥

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Agilent Technologies N9320A Guida Utente Pagina 57