opening data file created with 'Write File'

[ewestman]

I was in the field collecting data with 'Acquire N Scans Analog Hardware Trig.vi' and realized that I needed to save the data to a file.  I quickly added a 'Write File' and saved the data.  Now, however, I am not able to open the files that I created.  I've tried many things with 'Read File' and the 'Read Data' VI without any success.

Attached are the VI that I used and a resulting data file.  Any help would be greatly appreciated.

hardware: DAQPad 6070E

software: LabVIEW 7.1

VI Settings: 1 channel; number of scans to acquire = 300,000; scan rate = 625,000; pretrigger scans = 10,000

[devchander]

The modifications in this attached VI  will save data as an ascii file

but for such a larger scan rates and higher sample count, i would recommend file saving in Binary file format.

Go to examples>>hardware  input output>>DAQmx>.analog measurements >voltage >>cont acq&graph volt-to file(bin).vi and read data using graph acquired binary data

For traditional DAQ VI's, examples>>hardware  input output>>Traditional DAQ>>stream to disk examples

These should serve your purpose better

Regards

Dev

[devchander]

The modifications in this attached VI  will save data as an ascii file

but for such a larger scan rates and higher sample count, i would recommend file saving in Binary file format.

Go to examples>>hardware  input output>>DAQmx>.analog measurements >voltage >>cont acq&graph volt-to file(bin).vi and read data using graph acquired binary data

For traditional DAQ VI's, examples>>hardware  input output>>Traditional DAQ>>stream to disk examples

These should serve your purpose better

Regards

Dev

[Neil_S.]

ewestman,

Thanks for posting to the NI Forums.  I was able to read the data from the file you attached.  Reading the data requires passing the read binary file vi the waveform data type (which I did as a constant in the attached example.)  Let me know if you have any questions.

Regards,

Neil S.
Applications Engineer
National Instruments

[ewestman]

With your help I'm able to read the files now -

many thanks,

Erik