Agilent Technologies N9340A - Manual (Page 59)

Making Measurements 4
N9340A User’s Guide 57
Figure 12 Identifying Analyzer Distortion (O dB atten)
Figure 13 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
to be positive.
• The reduced contribution of the analyzer
circuits to the harmonic measurement causes
the Marker to be negative.
Large marker readout indicates significant
measurement errors. Set the input attenuator to
minimize the absolute value of marker.