USB 6008 multiple analog input channel

[fikri]

I am a new Labview user, and I am sorry if my question is too basic.

I have an NI USB-6008 device, and I want to use 6 channels of the device (analog input), each is 1000kS/s

I tried to add 6 DAQ Assistant in block diagram, and I've found that the software can only get the input from one DAQ Assistant. After I add channels in a DAQ Assistant, I tried to test the channels, and there are waveforms from the channels.

My question is, how to analyze each channel from one DAQ Assistant in block diagram? because after I add the channels, output from the DAQ Assistant is still one, which is only "data". For example, i want to do harmonic analysis in different phase of voltage and current in 3 phase system.

Thanks for any help.

Fikri Waskito

Message Edited by fikri on 07-29-2007 08:44 PM

[Dennis_Knutson]

All that you need to use is the Split Signal function in order to separate the different channels. This is on the Express>Signal Manipulation palette. You can drag it to split out as many channels as you have.

[fikri]

thank you very much for the answer.

is it possible in USB 6008 to have 6 channels of input, each channel is 10kS/s?

I mean that can we manipulate 6 channels not to capture in a same time, but maybe each channel is 10ms, and after that move to the other channel in 10ms, can it?

[Dennis_Knutson]

Yes. You have to have 6 separate tasks. Start task 1, run it, stop the task, start task 2, run it, stop the taks, etc.

[fikri]

thank you for the advice. but I've tried to make 6 tasks, and tried to start it and stop it using the timer. but it hasn't worked well yet.
would You give me the example using the picture or the .vi?
and why the output (type) from the tasks is different from the output from the DAQ assistant?