How to do frequency spectrum plot on live analog data ?

[zigbee1]

Hi everyone,

Could you please show me how to plot frequency spectrum on live analog data ?  I have created a VI which has a timed loop, inside the timed loop, I get analog value and put it in a chart, then I bundle this chart history array with dt = 1us to create waveform which goes into FFT spectrum but the result was not what I am looking for. Is this the right way to obtain live data ?

[iCan'tBerrPuns]

Hello zigbee1,

In order to better assist you, I have a few questions:

1. What hardware are you using to record your data?

2. What version of LabVIEW are you using?

3. How "live" do you want your data to be? (i.e. How quickly would you like the data in your waveform to update?)

4. How does the data you are seeing differ from the data you expect to see?

If you are comfortable doing so, you can post your VI so that I or other community members can look at it to better visualize your system.