CSV export only saves part of the waveform

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pvh1987
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CSV export only saves part of the waveform

Post by pvh1987 » Tue Jun 16, 2015 3:03 pm

I need to export approximately 400 MS of measurements from two channels in CSV format for further analysis. The save dialog warns me about a large file size of 339 MB. I save the file and find out that the file saved is only about 35 MB. In my export I only have measurements for the first 200 ms although the whole waveform is 2 seconds.

Is this a bug or have I missed a setting somewhere?

Thanks in advance :)
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Martyn
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Re: CSV export only saves part of the waveform

Post by Martyn » Thu Jun 18, 2015 7:25 am

The PicoScope software limits CSV exports to a million samples, this is an import limit of excel. Full data sets greater than this limit can only be saved as .mat (MATLAB format), or .psdata
Martyn
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pvh1987
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Re: CSV export only saves part of the waveform

Post by pvh1987 » Mon Jun 22, 2015 6:23 pm

Thanks for your response, Martyn. :)

I think it is wrong to limit the CSV-export just because Excel have a problem with big files, especially without warning the user, that the file is going to be truncated. By the way, I did a .MAT export and it worked fine. The downside is that users will need to have Matlab or other third party tools to be able to use this kind of file. I hope that CSV-file export will not be limited in the future.

I wonder if there is a file format specification for the PSDATA-files? If so, I am very interested. Those files contains more information than MAT-files and CSV-files and does not take up as much space. I am asking because I do a lot of programming and need a good way to import waveforms into my own programs.

Thanks in advance :)
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bennog
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Re: CSV export only saves part of the waveform

Post by bennog » Tue Jun 23, 2015 1:22 pm

pvh1987 wrote:I wonder if there is a file format specification for the PSDATA-files? If so, I am very interested. Those files contains more information than MAT-files and CSV-files and does not take up as much space. I am asking because I do a lot of programming and need a good way to import waveforms into my own programs.
There is already a topic about this.
There are more people who want to read / write .psdata to make max use of the picoscope hard / software.

topic12593.html

Benno
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