Speed of scanning and samples for FFT affecting dt

Hello

I have currently acquire the accelerometer data and the value of the scanning speed of the clock to 5120 s/s. I use then the analog 1 d Wfm Nchan N Samp to acquire 5120 samples, then use analysis FFT on it to create a chart of the frequency. It gives me a dt 1 that is a resolution of 1 Hz.

The question I have is how can I sample the data with a dt 1 at a faster pace.

For example, I change the speed of scanning on 10240 and always acquire the 5120 samples, allows me to taste two times a second, it gives me a 2 dt (2 hz resolution) when I do my FFT analysis. All that happens to raise the rate of scanning for the sample clock is that I can now detect the peaks at higher frequencies.

By that I mean if I just scan 5120 s/s with my card, when I TFF, it goes up to 1100Hz about, if I double the speed of scanning, then this double to about 2200Hz, she then reduces the resolution

How can I improve the speed of update and still keep a 1 DT?

Thank you

Mike


Tags: NI Software

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