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However, at higher distortion levels the discrepancy becomes large. For instance, a signal with THD F 266% has a THD R of 94%. [4] A pure square wave with infinite harmonics has THD F of 48.3% [1] [14] [15] and THD R of 43.5%. [16] [17] Some use the term "distortion factor" as a synonym for THD R, [18] while others use it as a synonym for THD F ...
A total harmonic distortion analyzer calculates the total harmonic content of a sinewave with some distortion, expressed as total harmonic distortion (THD). A typical application is to determine the THD of an amplifier by using a very-low-distortion sinewave input and examining the output.
Total harmonic distortion, or THD is a common measurement of the level of harmonic distortion present in power systems. THD can be related to either current harmonics or voltage harmonics, and it is defined as the ratio of the RMS value of all harmonics to the RMS value of the fundamental component times 100%; the DC component is neglected.
THD+N includes everything other than the fundamental, which means intermodulation products, interference, etc. THD without N would only measure harmonics. If you think it is confusing, please try to reword it.
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Excessive Total Harmonic Distortions (THD) and low power factor are costly at every level of the electricity market. The impact of THD is difficult to estimate, but it can potentially cause heat, vibrations, malfunctioning and even meltdowns. The power factor is the ratio of real to apparent power in a power system.
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Spurious-free dynamic range (SFDR) is the strength ratio of the fundamental signal to the strongest spurious signal in the output.It is also defined as a measure used to specify analog-to-digital and digital-to-analog converters (ADCs and DACs, respectively) and radio receivers.