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165
Figure 7-81 Sample 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
THD=
√
V
1
2
+V
2
2
+V
3
2
+V
4
2
+V
5
2
V
f
Total Harmonic Distortion (THD) dB: the ratio of the sum of harmonic
powers to the power of fundamental frequency
THD=10log
10
(
√
V
1
2
+V
2
2
+V
3
2
+V
4
2
+V
5
2
V
f
)
Total Harmonic Distortion and Noise (THD + N) – the ratio of the harmonic
power plus noise to the fundamental power
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