fixed rate acquisiton decimated to different rates and saved to tdms with correct timing

[bassinbc]

I am attaching a vi that I made to try and show what it is I want to do. The data will be captured at 10K Hz and 2000 samples. I want different rates used to decimate the data and then get proper timing stored to tdms. I seem to be able to get the data decimated properly as far as sample size. I just can't get the data into tdms so it show the proper number of samples and proper time stamps.

[GerdW]

Hi bassinbc,

why don't you scale the dt of those waveforms in this weird manner? Why not apply the decimation factor on dt?

Keep in mind: your decimation factor should be limited to integer values!

[bassinbc]

Thanks, that is simpler. Since I am capturing at 10k Hz and 2000 samples a pop, I get 5 of the decimated waveform sample per second. So is I were to save these I would have 5 times the # samples for each waveform as the decimated factor for that channel. Hard to see this with the same amplitude of the samples always being generated. So my next question is how to get proper timing saved to the tdms file. How to timestamp the data in the file to be viewed with a program such as scout with several waveforms on the screen so the data is aligned by time.

[crossrulz]

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@bassinbc wrote:

How to timestamp the data in the file to be viewed with a program such as scout with several waveforms on the screen so the data is aligned by time.

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Just wire up your new waveforms to the TDMS Write and all of that information will be taken care of (T0 and dt will be stored as metadata for the channel or group).

[bassinbc]

Didn't catch it at first. You have to multiply by 5 to get correct dt.