Data Acquisition VI

[dolakha]

Hello,

I am a graduate student and new to labview program, I have spent my couple of weeks to learn about labview and data acquisition techniques in labview. So far I  am able to code a program as attached (block diagram) which basically runs only at highlight execution mode. I need to run the program throuhout the test period and record all the datas. I have NI- SCXI 1001 hard ware device  and 2013 labview. I need to read from multiple channel at a time though it seems to be doing with this code. The output as attached is also not clear. I want the output to be tabulated with topic like Load, Stroke, Potentiometer 1 and Potentiometer2 etc. Please all help me to solve this problem. Your suggestions are highly appreciated.

[Dennis_Knutson]

Converting to dynamic data is silly in your case. If you want timing information, acquire as 1D waveform. The Write only records the very last data acquired. Either write inside the loop or build a 2D waveform array out of the loop.

[dolakha]

Thank you very much for prompt reply, I tried to follow your instruction and still it doesnt work. Please can you suggest me in detail or post a code for me. I am in trouble since a month for this code.

[Dennis_Knutson]

Sorry, I'm posting from my phone. Show what changes you've made.

Have you looked at the examples that come with LabVIEW?

[dolakha]

Sorry to be late, I didnot get a chance to go to lab for screenshot, all I did is bring write sub pallette inside loop and changed to 1D waveform. It runs for someseconds and then dont...

[dolakha]

Dear Dennis,

I have incorporated your comments and also revised from my side, now it is working  little bit, I still wants to improve its functionality in the area of displaying graph, and time flexibility, please suggest me. If you have any informative links and documents regarding data acquisition please convey to me.

I have attached screenshot of block diagram for your kind information.

[Dennis_Knutson · Accepted solution]

Why on earth would you wire the iteration terminal to the delay function?

[dolakha]

Yes sir,

I remove delay function, this time my wave graph displays only four points as I am connected to 4 channels..My assumption is they need to extend with increase in time, What may be the problem? It is writing to the file but my x axis is time but it shows some values negative..I am confused.

[Dennis_Knutson]

What is your rate and number of samples?

[dolakha]

I have 1000 /sec and 100 samples to maintain ratio... I am thinking up to increase it.