topic Re: release time with daqmx in LabVIEW

release time with daqmx

nichts — Mon, 04 Feb 2013 18:52:47 GMT

Hello,

How I can define the release time with DAQmx ??

Re: release time with daqmx

Dennis_Knutson — Mon, 04 Feb 2013 19:11:37 GMT

What is 'release time'?

Re: release time with daqmx

nichts — Mon, 04 Feb 2013 19:43:59 GMT

release time: is a switch time between tow signal to read a signal to other signal. when tow devices connected with daqmx card... for example: I have to devices and they are connected to a DAQcard.. I want to read a signal from the first device for 50ms and then switch for the other device and read his signalfor 50 ms then switche to the first device ...etc

Re: release time with daqmx

Dennis_Knutson — Mon, 04 Feb 2013 19:59:52 GMT

In general, with a single DAQ device, both signals are connected at the same time and the acquisition time is a function of sample rate and number of samples read. For example, with a sample rate of 1000 Samples/sec and 50 samples, the acquisition will take 50 msec. You get an array returned so if you wanted to look at only one signal per iteration of the while loop, it is simply a matter of indexing the specific channel from the array. You would need to set sampling mode to continuous to avoid gaps and for precise timing. Using two separate tasks and switching back and forth would add a lot of overhead to close/create the tasks and you would have little control over this time.

Re: release time with daqmx

nichts — Mon, 04 Feb 2013 20:25:04 GMT

thank you very much for your help 🙂