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Chapter 2 Using Spectrum Analyzer
Conducting RF measurements
Figure 14 Spurious emissions measurement with spectrum analyzer
Total harmonic distortion (THD)
You can measure the Total Harmonic Distortion (THD) using the spectrum analyzer.
THD is defined as the ratio of RMS voltage of the harmonics to that of the fundamental
component. This is accomplished by using a spectrum analyzer to obtain the level of
each harmonic with peak detector.
To set measure setup
You need to set the fundamental frequency to measure the total harmonic distortion.
Once you set up, it will automatically collect the harmonic outputs up to the tenth
harmonics from the spectrum analyzer and calculate the corresponding THD value (%)
and the distortion attenuation (dB).
1
Tap the Setup (
2
Tap Fundamental Frequency and input the value using the on-screen keyboard.
The total harmonic distortion screen changes accordingly.
3
Tap Menu > Amp/Scale to set the related parameters such as Reference Level,
Attenuation, Preamp, External Offset, and Scale Division. See
tude" on page 11
Page 32
NOTE
If you select the first icon next to the Range table above, it only shows the
selected range. If you select the second icon next to the Range table, it keeps
moving from the first selected range to the final selected range.
) icon on the side bar.
for more information.
SPA06MA-O User's Guide
22145360, R005
"Setting ampli-
April 2021
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