Agilent Technologies N9340A Guía de usuario Pagina 61

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Making Measurements 4
N9340A User’s Guide 55
Figure 14 Identifying Analyzer Distortion (O dB atten)
8 Press [AMPTD] > {Attenuation} > 10 > {dB} to
increase the RF attenuation to 10 dB.
Figure 15 Identifying Analyzer Distortion (10 dB atten)
The marker amplitude readout comes from two
sources:
Increased input attenuation causes poorer
signal- to- noise ratio. This causes the marker
delta value to be positive.
Reduced contribution of the analyzer circuits
to the harmonic measurement causes the
marker delta value to be negative.
A large marker delta value readout indicates
significant measurement errors. Set the input
attenuator at a level to minimize the absolute value
of marker delta.
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