Analysis of measured voltage using matlab

i need to analyse my lab data, which is the output from DAQ accelerometor and so on using matlab. I plotted graphs using fft as my values are given in time time variants. I can find 5 columns in my labview file, the first being time and the others are values from different equipments. which all graphs do i need to plot in order to analyse the voltage signal and to figure. I also need to find how my sampling frequency is permits the accurate measurements of input frequency.

Answer 1

[Leepakshi]

Hi Minhas,

To analyze your lab data:

1. Firstly you can use the `plot` function to draw time (x-axis) versus each voltage signal (y-axis).
2. Next, you can go for `plot` again for the frequency-domain by plotting frequency (x-axis) against FFT magnitude (y-axis) for each signal.
3. You can also overlay multiple signals on the same time plot for comparison.
4. Optionally, use the `spectrogram` function to show how frequency content changes over time.

These steps help you examine both time and frequency aspects of your signals and check if your sampling frequency is adequate.

I hope this helps!

Thanks