Changes in AC Signal Frequency with Coupling Changes on Digital Oscilloscopes

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SUMMARY

Changing the coupling mode from AC to DC on a digital storage oscilloscope does not affect the frequency of the AC signal being measured. The primary difference lies in the handling of the DC offset; while the DC component may be removed in AC coupling, the frequency remains unchanged. This behavior contrasts with analog oscilloscopes, which also maintain frequency consistency regardless of coupling mode. For a comprehensive analysis, the specific signal wave type and oscilloscope model should be provided.

PREREQUISITES
  • Understanding of digital storage oscilloscopes
  • Knowledge of AC and DC coupling principles
  • Familiarity with Fourier Series and signal components
  • Basic waveform analysis techniques
NEXT STEPS
  • Research the specifications and features of digital storage oscilloscopes
  • Learn about AC and DC coupling effects on signal measurement
  • Explore Fourier Series and its application in signal analysis
  • Investigate different signal wave types and their characteristics
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Electronics engineers, technicians using digital storage oscilloscopes, and students studying signal processing who seek to understand the implications of coupling changes on frequency measurements.

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im using digital storage oscilloscope to measure the frequency of ac signal
wat will happen to the frequency of ac signal if i change the coupling from ac to dc??
will there be any changes?
how to explain the changes?
 
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I don't know about digital oscilloscopes, but there isn't any change on a good analog oscilloscope. You know how in a Fourier Series there is an initial term? Well that term is your DC term, and a good oscilloscope should merely chop it off between AC and DC coupling. So the DC offset may change, obviously, but the frequency certainly shouldn't.

That's my general answer, but I think to properly answer this question you would have to post the signal wave type and the model of the scope, and I would have to do a lot of reading about the scope that I, honestly, probably wouldn't get around to doing. :)
 

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