Hello, I am having problems with NiDAQmx 8.6.1. OS: Windows XP Home LabVIEW 8.0 Student Edition I rebuilt my computer (new CPU, MB, Video, Memory, etc) 9Jan2008 and everything (including LabVIEW) worked fine. I tried writing a simple program using the DAQ Assitant and error 200279 popped up. I isolated it to the DAQ Assistant. Using Acquisition Mode: N Samples, Samples to Read: 100 and Rate (Hz): 1K, the Test Panel runs as it is supposed to. Using Acquisition Mode: Continuous Samples, Samples to Read: 100 and Rate (Hz): 1K, the Test Panel returns Error 200279 and DAQ Assistant hangs up and even using Windows Task Manager takes a couple of minutes to shut it down (CPU Usage stays at about 50%). Changing the Samples to Read to 2 gives the same result. I called a friend who was also using NiDAQmx 8.6.1 and she did not have this problem at all. So the problem is related to my computer system and NiDAQ. Any idea on how to solve? Screen shots attached. Oliver Asato MrOliver2@hotmail.com

Hi Oliver, Error #200279 usually occurs when you are sampling and not reading values out of the buffer quickly enough.Try and follow the 10% rule for Continous Acquisition with DAQmx. The Samples to Read should be 10% of the sampling rate. For a sampling rate of 100KS/s then you would want a Samples to Read of 10K. Are you able to successfully test the DAQ Assistant using the Run button? When performing a N Samples acquisition, the Samples to Read actually determines how many samples to take. There is a _very_ useful formula that comes out of this: Sampling Rate = Samples to Read/Time Finally. I would suggest to use our shipping examples to see how DAQmx should be programmed. These can be found at: Help->Find Examples->Hardware Input/Output->DAQmx->Analog Measurements->Cont Acq..... Have a great evening! Best regards, MatthewW Applications Engineer National Instruments Message Edited by Matthew W on 01-24-2008 06:22 PM

LabVIEW

Error 200279 - DAQ Assistant - Continuous Samples

Solved!

Mathew

Your comment has details about N sample and continuous sample acquisition. Thats the reason I posted my question as a reply to your comment.

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Error 200279 - DAQ Assistant - Continuous Samples

Re: Error 200279 - DAQ Assistant - Continuous Samples