How to remove the first 12 seconds of data collected by the device

[laixx]

Hello, masters, I bought a device （NI cDAQ-9132and NI）to collect acceleration signals, but through the waveform, I found that the first 12 seconds of data is too large, seriously off the actual value. The data will be normal after 12 seconds, so I want to delete the data collected within 12 seconds of the device starting to collect. What should I do, please?

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[altenbach]

A photograph of your monitor is not really suitable to offer a solution. You can for example only start recording after a certain delay or you can trim the data later. Both are simple. How much LabVIEW programming do you know?

[laixx]

I have only been learning LabVIEW for 3 months. Could you please tell me how to delay recording, for example, start recording after 12 seconds? Thank you very much!

[GerdW · Accepted solution]

Hi laixx,

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@laixx wrote:

Could you please tell me how to delay recording, for example, start recording after 12 seconds?

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Set DAQmxRead to read data for exactly one second (number of samples = samplerate).

Then use a case structure to do "nothing" in the first 12 iterations of that while loop.

Do your analysis/"recording" only starting from 13th iteration on!

Btw. there is no "recording" in your VI, all I see is DAQ and some data analysis/display…

[laixx]

Thank you very much！The data will be packaged and transmitted to the train system home through certain protocols. The VI for transmission has been written but not uploaded