D.E.V.I.C.E. is an encyclopedia of terms used by manufacturers of test and measurement equipment. T&M Atlantic created this service to better explain the functionality of instruments it offers, and to highlight the latest developments in the world of measurement equipment. We are using such tools as animation to bring words and pictures to life and to create not just an understanding but also an appreciation for technology that goes into the design of every instrument.
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In the course of various nonlinear transformations harmonic voltages and currents lose their ideal form. Periodic voltages and arbitrary shaped currents can be represented by the sum of their harmonics which have frequencies multiple of signal repetition frequency (i.e. the frequency of the first harmonic). Total harmonic distortion ratio determines the difference of the real signal form from perfect sine wave:
Where Ui – voltage of i-th harmonic of the signal.