Live FFT result on waveform

[Loppy]

The attempts are in the vi. The latest attachments are they attempt to try and build and array of consecutive numbers.

The total capacitance is the values I am getting with the sensor at rest.

I am missing something fundamental in trying to build this array. If I use random number as a test it works ok but when I put the signal from the total capacitance line into the build array then it still only gives me one field in the array. The 10 count is just for testing purposes.

The point by point vi wont work as I have the signal as a 1d array

Thanks for your patience

[GerdW]

Hi Loppy,

are you sure you want to measure signals in the order of 1E-11?

(Though it seems better than 1E-299… :))

[Loppy]

Hi Gerd

the numbers coming in are shown in the attachment. The Capacitance readings are just a calculation, the graphical representation and the resultant FFT frequency should be the same regardless of the data used as the response of the sensor is the same just presented differently

Richard

[nclark]

You may be interested in using the "build waveform" function. Here's a tutorial: http://ptolemy.eecs.berkeley.edu/eecs20/labs/LabVIEW_Tutorials_PDF/HowtoUsetheBuildWaveformFunctionT... .

You also need practice building arrays. I've no idea what you were trying to accomplish in those array images, but from the looks of it, its not working as you are expecting it to work. Here's a tutorial: http://www.ni.com/white-paper/7571/en/ . Alternatively, you can also google search "LabVIEW build array shift register" and look through the images to see how others have implemented the tool.

While your looking at these tutorials, could you take the time to build a quick circuit diagram of your circuit? I do honestly believe that some of your sampling problems could be solved with an OP AMP. It doesn't have to be anything fancy. Just something that gives me an idea of what your looking at hardware-wise.