How to represent Frequency in Hertz rather than Frequency bin.

[jamison.suade]

In my fft code, when i connect the waveform graph to my FFT, the resulting plot is Magnitude vs Freuqnecy in bins (frequency index). How do I represent this frequency in Hertz instead of the index. 

Here is my .vi

[jamison.suade]

[jeanlucpicard]

the fft vi has quite good help, which explains the frequency resolution of the output. you can use scaling options (offset and multiplier) on your chart to match the frequencies

you can also find the help here: http://zone.ni.com/reference/en-XX/help/371361H-01/lvanls/fft/

[jamison.suade]

I need other ideas

[GerdW]

Hi gijude,

i already answered that in your other thread here! Read the sentence on manipulating the x axis!

Please stop creating double posts when you try to solve the very same topic!

[jamison.suade]

After locating the offset. What do i set in order to have a label of 0 at the center?

[jamison.suade]

After locating the offset. What do i set in order to have a label of 0 at the center?

[GerdW]

Hi gijude,

when your axis use a range from -x to +x your offset needs to be -x…

[jamison.suade]

Hi sir GerdW,

I already get your point, but I still dont know what to connect in my Offset

Here is the screenshot of my block diagram

[crossrulz]

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gjjude wrote:

I already get your point, but I still dont know what to connect in my Offset

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The offset should be half of your sampling frequency.