Re: resolution in the fft

[Markus Feldmann]

Schirmacher, Rolf schrieb:
> I guess you mean the frequency resolution by xscale resolution. 
>
> According to the basics of fourier analysis, you have to increase the length
> of the time domain signal in order to increase the frequency resolution (and
> take care of your window, of course).
>
> And the other way around, of course: If you increase the time resolution,
> you will get in addition higher frequencies.
>
> HTH
>
> Rolf
So i only have to measure longer in the time domain ?

The other Problem is that i am not sure whether my signal is correct.
It seems to start from DC and goes down

regards Markus