DAQmx Read 2D dbl

[starcha]

    DAQmx Read  2D DBL or 1D waveform....

    When to use, and how to use each of this iteration of DAQmx Read...

    Idea is to monitor multiple channels (3 analog voltage input) and to put it on chart...

    I did all as in LabVIEW examples but what I get is three identical (almost identical) signal on chart display but
signal generato connectd only ot one ai0 physical channel

[Dennis_Knutson]

A waveform data type contains timing information in the form of t0 (start time) and dt (sample interval). If you don't want this information, you can use the 2D DBL. Many analysis functions require the timing information so it also depends on what you might want to do with a signal after it's been acquired.

This is expected behavior when you have open/floating channels. Connect them to something and you will see each channel correctly.