Technical data

98 Chapter 5
Spectrum Analyzer
Making Distortion Measurements
Spectrum Analyzer
Figure 5-21 RF Attenuation of 10 dB
Step 12. Press Peak Search, Marker, Delta
Change the attenuation to 15 dB by pressing AMPTD Y Scale, Elec Atten,
15,
dB.
If the ∆Mkr1 amplitude absolute value is approximately ≥1dB as seen
in Figure 5-22, then more input attenuation is required; some of the
measured distortion is internally generated. If there is no change in the
signal level, the distortion is not generated internally. For example, the
signal that is causing the distortion, in this case, shown in Figure 5-22,
is not high enough in amplitude to cause internal distortion in the
analyzer so any distortion that is displayed is present on the input
signal.
Figure 5-22 No Harmonic Distortion