Re : Re: analyzing two signals

[mysimba]

Hello everybody,

I have to analyze two signals from two different inputs in parallel with DAQ card.
Should I have to use two DAQ cards? (because I receive an error message while running Labview with only one card : DAQ is reserved...)

Thanks

[Dennis_Knutson]

You would only need two DAQ cards if the DAQ cards you are using only have a single channel and NI doesn't make single channel DAQ cards.

If you are using DAQ Assistant, use only one assistant but specify two channels. If you are using the regular DAQmx functions, use a single DAQmx Read and with a single DAQmx Create Channel, have two channels in the list. The syntax would be Dev1/ai0:1. You can easily select multiple channels by clicking the arrow on the right side of the channel list control and selecting browse.

p.s. You need to post similar questions to the Multifunction DAQ forum. This forum is for instrument control (i.e. GPIB instruments).

[mysimba]

Thanks for your answer,
my DAQ support more than an input.
I'm using DAQ max, if I well understand I must specifie two inputs examplt dev1->a0 and dev1->a1 using only one DAQ max and not two like i'm trying now.
I will try it tomorrow.

p.s. next time I will post in DAQ multifunction.

[Dennis_Knutson]

No. Your example is not correct. If you use '->', you will get an error. The correct syntax is Dev1/ai0:1 as I said. If you want non-consectutive channels, it is Dev1/ai0,Dev1/ai2 for example.