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- What exactly are harmonics and how do they appear?
The blue sine which shows 1 period is the fundamental Then there's the third harmonic (square waves don't have even harmonics), the purple one Its amplitude is 1 3 of the fundamental, and you can see it's three times the fundamental's frequency, because it shows 3 periods Same for the fifth harmonic (brown)
- telecommunications - Standards for Total Harmonic Distortion in . . .
I found IEEE 519, but it primarily addresses the design of electrical systems Perhaps the focus should be on determining the lowest level of harmonic distortion below which the human ear cannot perceive audio distortion? The original message signal is a sine wave, and distortion with respect to the original message signal needs to be measured
- filter - What is the harmonic content of a PWM signal? - Electrical . . .
Suppose I'm using a 3 6 kHz carrier to reproduce a 60 Hz sine wave To properly design a filter for this application to hit a specific harmonic distortion target, I need to know the harmonic content of the PWM signal How can I predict what that harmonic content is? Is it going to vary dramatically with the pulse widths?
- Help me understand FFT and harmonic distortions - Electrical . . .
I'm new to FFT and harmonic distortions I'm dealing with a power system where the phase currents are distorted Now I don't understand the concept of FFT and why the harmonics seen in FFT relate to the current waveforms FFT shows how the current waveform changes in gain by frequency instead of time
- Why dont we use the third harmonic in power transmission?
If each conductor carries a 3rd harmonic, and each current is 120° phase shifted from its companion, then regardless of the relative phase of fundamental and harmonic, the phase of the 3rd harmonic is (120°) × 3 = 360° = 0° That is, if we insist that each wire has the same waveform (a symmetry condition), then all harmonic currents will
- Why harmonic distortion and not at other frequencies?
Harmonic distortion is harmonic because it is related to the primary periodic waveform that is the basis for comparison A nonlinear impedance effects every cycle of the waveform in the same way It does not randomly insert something here and there Distortion that is not harmonic is often transient
- amplifier - Calculate total harmonic distortion - Electrical . . .
Total Harmonic Distortion fundamental frequency clarification 1 Efficient method of measuring total
- EMC emission harmonics - Electrical Engineering Stack Exchange
Half of 25 MHz is 12 5 MHz and, 62 5 MHz is the fifth harmonic 312 5 MHz is the 25th harmonic of 12 5 MHz Try looking for other harmonics in between that may be a lower level and you have not noticed Anyway, the EMI will be related to sub-harmonics of 25 MHz and almost certainly not due to the basic crystal frequency
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