Total harmonic distortion
![total harmonic distortion total harmonic distortion](https://www.researchgate.net/profile/Md-Murshadul-Hoque/publication/337198714/figure/fig2/AS:824465751556096@1573579361182/Total-harmonic-distortion-THD-of-the-load-current-of-the-a-simulation-and-b.png)
![total harmonic distortion total harmonic distortion](https://generatorbible.com/wp-content/uploads/distortion-caused-by-harmonics-1024x396.jpg)
In most cases, the amount of THD will depend on the amplitude of the input signal.
![total harmonic distortion total harmonic distortion](https://i1.wp.com/electricalapprentice.co.uk/wp-content/uploads/2019/01/Harmonics_reccs.png)
For severe nonlinearities, many harmonics must be included in order to obtain an accurate measurement. For mild nonlinearities, it is usually the case that energy falls off at higher harmonics, so that most of the THD energy is contained in the low harmonics. In order to make the THD measurement possible, only a finite number of harmonics can be considered in the measurement. Sometimes, this value is presented as a fraction (percentage) of the input signal's amplitude. The square root of the sum is the value of THD. Amplitudes at each harmonic frequency are squared, and then summed. In order to perform a true THD measurement, energy must be measured separately at harmonics of the input signal. It is therefore important to have a pure input signal, i.e., one that has almost all of its energy contained at a single frequency. Other periodic test signals or broadband signals are not ideal for THD measurements, because energy contained in the input signal can mask energy created by nonlinearities in the system. Energy that appears exactly at harmonics of the input frequency is almost certainly generated by nonlinearities in the system. A sinusoidal input is used because sinusoids contain energy at only a single frequency output energy that appears at any other frequency is thus the result of nonlinearities or time-varying system behavior. A THD measurement can be made by applying a sine wave as an input to a system, and measuring the total energy which appears at the output of the system at harmonics of the input frequency. THD stands for Total Harmonic Distortion and can be used to estimate the degree to which a system is nonlinear. Starlight Echo Station Starlight Echo StationĪstra Modulation Machine Astra Modulation MachineĤ-710d Four-Channel Tone-Blending Mic Preamp w/ Dynamics 4-710d Four-Channel Tone-Blending Mic Preamp w/ DynamicsĪbout Find a Dealer Downloads Blog Support Log In Thunderbolt 2 Option Card Thunderbolt 2 Option Card