About theoretical Timing

Hi all!

I have a question about the calendar with the DAQmxbase functions. I have the task to save data with a sampling frequency static (it will be greater than 100 000 points per second in theory) and I need to display a writing data to the file in real time. So my idea was to put the sample clock to whatever the desired sampling frequency (lets say 100 000 at the moment) and I would have a loop of standard state machine (just a while loop with shift registers and a case statement inside) to collect data and write to the file then to decimate the data to display to the user. Each of these iterations, the amount of data read would be one-tenth of the sampling rate so I thought I could count just iterations until I arrived at the sampling frequency * 10, which would be the total number of hours. Unfortunately, after the execution of this program for a desired 20 minutes to 50,000 points per second, I noticed that the iterations had invariably longer over time, but it was so small that I didn't notice when I tried for 3 to 5 minutes. Is that what this has to do with the decimation of data slow down the program because we need to reallocate the array every time or it has to do with my way of thinking wrong in the way of our recordings of tension time?

Information

-LabVIEW 2014

DAQmxbase - package used

-System MAC OS X

- NI USB-6211

Needs

-L' sample rate > 100 000 points per second

-record for a specific amount of seconds by the user

-written in the file and displays the user data

Problems

-While the iterations of the loop are run 0.1 of a second making the program more continue to record the tension longer than expected

Please, if you do not understand or I forget important information please let me know!

1 State Machine is NOT good architecture here.  You must keep this look DAQ run fast enough to track data in data acquisition.  Use rather a producer/consumer.  The idea here is that you have parallel loops that make the data recording and processing of data and let the DAQ loop to just read the data that it is.

2. in windows calendar is not reliable.  Do not trust it.

3 use the configure DAQmx Timing (assuming that there is no in the DAQmx Base) do DAQmx data stream into your PDM file.  It's one thing less worries and it is much more effective would you be able to do.

4. If you follow my advice in (1), then you should read a certain number of points for each iteration of the loop.  Let's say 10kS.  Therefore, each iteration of the loop will be 100ms.  But for your decimation, you take all 10 samples.  There is a simple decimate 1 D table that you can use to make it easier on yourself.

Tags: NI Software

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