8. Measurement
8.1 Principle
An initial harmonic analysis of the voltage or current waveform can be obtained by viewing the signal on an oscilloscope. This method highlights the distortion of the voltage or current, but does not allow precise quantification of the harmonic components.
There are many digital analyzers on the market capable of measuring harmonics up to rank 50. These devices are generally based on the following principle. Signals are filtered and converted into a sequence of digital values, from which a fast Fourier transform (FFT) algorithm calculates the amplitudes and phases of the harmonics.
These are then averaged over a time period linked to the speed of variation of the phenomena observed.
A value of 3 s...
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Measurement
Conclusion
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In the introductory article , it is shown that equipment connected to a network must, on the one hand, not "emit too much" disturbance and, on the other hand, must not be "too sensitive" to this same disturbance. While simple to express, this dual concept is more difficult to implement in the field. Indeed, for a particular piece of equipment, reducing its emission of disturbance and/or...
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