LabVIEW

Put the acquisition and filing in different loops running in parallel at different rates. As the data is aquired, transfer it to the other loop via a queue or functional global. When the 100 points are accumulated, average them and write to the file. Put a time delay in each loop so that the scheduler will allow each of them to run as neeeded.

Lynn

Hallo Lynn

Thank's a lot for your suggestion. But I am not sure If I get what you're saying. Do you mean to have two parallel Do While loops that one only acquires the data and the second does the averaging plus writing file I/O ??? I don't really know what queing stands for. So there is no way to do it in a single loop. Since that means to skip the express reducing data VI and just use a shift register in the other loop. Is that what you meant ?

Sincerely

Karlito

The queue is a means of transferring data between the two loops without creating a data dependency. I have attached an example. The Acq queue transfers data (in the example the string "data") from the Acquisition loop to the Analysis loop. The Analyze queue transfers the value of the Stop button from the Analysis loop to the Acquisition loop so that one control stops both loops.

All of your data hanlding algorithms and VIs can be exactly the same. You just decide which loop is the best place for them. I usually put only the acquisition VIs in the Acquisition loop and all data handling, analysis, data reduction, etc. in the Analysis loop. Many times I have a third loop for displays and user interface.

I hope this helps to clarify
this approach.

Lynn

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hi johnsold
hi  i am also searching for the this thread ,but i am having one doubt. i am doing acqustion for 5 hours ,where i want to write the data paralelly 5 mins a data  and also display the result also ...

Usually it is better to start a new thread than to append to one which is 4 years old.

Did you look at my 2Loop.vi example which I posted above? Just set the analysis and save VIs to write to the file every 5 minutes and to update the displays a few times per second or slower, depending on how fast it needs to update.

Lynn

yes , i am new to this concept help me
      i am using that one ,but the program is locking , my require ment is when the data acqustion is going on i want to write the data into the files aswell as i want to display .i done the display part its ok
when writting ,i want to write the file as 5 min data the file name should be the start time of the 5 min data . like that it will go upto 5 hours ..
where i want to put the outer loop and how i want to know how to check the 5 min elapsed .
here with i attached the vi 
instead of reading form the instrument u just use some random num 1 d array of 401 points
help me
give some ideas plz
indrajit