Best way of multi-channel measurements using NI-USB 6009?

[JudeLi]

I'm new to labview and I'm trying to acquire multiple voltages from several channels and display them on one graph. It seems impossible to do it simultaneously since that NI-USB 6009 has only one set of ADC. 

The only way I have ever come up with is to use daq assistant to acquire voltages one by one and then make it a while loop, but is there any time delay during the shift between channels?

And is there better ways to acquire data from multi-channels?

[Dennis_Knutson · Accepted solution]

If you have specified multiple channels (i.e. Dev1/ai0:ai3) with a single DAQ Assistant, then that is the correct method. The inexpensive device does not have simultaneous inputs so you'll have to live with the small inter-channel delay.

[JudeLi]

Thank you for your reply!

Is it something like this?

[Dennis_Knutson]

Can you post images of the block diagram and DAQ Assistant. I'm not at a computer right now.

[Dennis_Knutson]

Can you post images of the block diagram and DAQ Assistant. I'm not at a computer right now.

[JudeLi]

Like this?

[Dennis_Knutson]

You didn't show the DAQ Assistant but it seems you are acquiring all channels.

Please note that you will may run into memory problems if you run the VI for a long time. How much do you really need to display?