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174
Figure 9-64 Measurement Screen 2 (Spectrum View)
Frequency Peak Value — the frequency of the peak signal value
Amplitude Peak Value — the amplitude of the peak signal value
Average Amplitude Peak Value — the amplitude of the peak signal value
captured over multiple times
Total Power — the power of the entire signal captured in the spectrum view
Total Harmonic Distortion Percentage ( THD) — the ratio of the sum of
harmonic powers to the power of fundamental frequency
√V
2
1
+ V
2
2
+ V
2
3
+ V
2
4
+ V
2
5
Vf
Total Harmonic Distortion (THD) dB: the ratio of the sum of harmonic
powers to the power of fundamental frequency
√V
2
1
+ V
2
2
+ V
2
3
+ V
2
4
+ V
2
5
( )
Total Harmonic Distortion and Noise (THD + N) — the ratio of the harmonic
power plus noise to the fundamental power
THD = 10log
10
THD =
Vf
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