Howtosignalprocessing
Harmonic Distortion analysis is a type of transient analysis in which a single frequency sinusoidal signal is applied to an input source and the resulting distortion measured in the output.
- How is harmonic distortion measured?
- What is a good THD value?
- How does harmonic distortion work?
- What is THD and how it is calculated?
How is harmonic distortion measured?
Harmonic distortion may be measured by looking at the output spectrum on a spectrum analyzer and observing the values of the second, third, fourth, etc., harmonics with respect to the amplitude of the fundamental signal. The value is usually expressed as a ratio in %, ppm, dB, or dBc.
What is a good THD value?
Measuring THD
For best results, the voltage THD should not exceed 5%, and the current THD should not exceed 20% of the fundamental frequency.
How does harmonic distortion work?
“Total Harmonic Distortion is a value of measurement given to the difference between the input signal and the output signal from the amplifier.” Distortion of a sound is exactly what it sounds like. It is extra being put into the final output signal and making it sound wrong, i.e., distorted from its pure form.
What is THD and how it is calculated?
The total harmonic distortion (THD or THDi) is a measurement of the harmonic distortion present in a signal and is defined as the ratio of the sum of the powers of all harmonic components to the power of the fundamental frequency. Distortion factor, a closely related term, is sometimes used as a synonym.
