How to save the waveform chart information

I am attaching a VI which recordes the power and wavelength from a ILX lightwave power meter. I had added  waveform chart  to the program to record the values of quatities with respect to time. Please kindly help me to read the quantities  on time with saving the values from initial time to final time. I I use shift registers with a built array in the while loop , will it retains the past values? 

I had added  waveform chart  to the program to record the values of quatities with respect to time.
Wrong. Charts don't display values with respect to time!
Hey Gerd,
I don't quite understand. If I wire a waveforme to a waveform chart it stores an processes data as waveform i.e. t0,dt and [y]. This, to me is in respect ot time.
If you meant, though, that it doesn't do that in his case, I very much agree with you.
As for the free tutorials:
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