DAQmx configure logging (TDMS) and time channel

[oldrich.hamernik@trw.com]

Hello,

I stream data directly to my computer via cDAQ-9172 with the help of block DAQmx configure logging (TDMS). Wonderfull, very good data speed. But I would like also have a time channel inside of TDMS file. But I wouldn't like to re-open measured file. Is it possible to save time channel together with measured channels? Thank you for reply.

[AndrewMc]

The timing information for the acquired channels is stored in the file and can be accessed simply by reading a waveform from the TDMS file (as opposed to an array of doubles).  Do you mean a time channel independent of the acquisition?

[oldrich.hamernik@trw.com]

Hello,

Thank you for your quick reply. I would like to have channel with time information for each sample of acquired signal, see attached picture. I want to have same time channel which is always made by DIADEM DAC. Is it possible to do it by DAQmx configure logging (TDMS) block in Labview? 

Thank you

Oldrich

[AndrewMc]

I will defer to the DIAdem experts on this (though I will let them know about your question).

From my knowledge DIAdem, you can go to the "Analysis" tab and find "Numeric Channels <-> Waveform Channels" under "Channel Functions".  Then, you can convert the waveform channel to two separate numeric channels of data and time.