76
Figure 1-81
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
