Changes in AC Signal Frequency with Coupling Changes on Digital Oscilloscopes

[blade_090]

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?

 

[Mindscrape]

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. :)