Decimate.VI does not work for me
Hello
I use two NI9237 modules and a NI9219 in a NIcDAQ-9174 chassis. The NI9237 are used to measure strains and the NI9219 is used for currents. I want to measure both with a frequency of 100 Hz. I already know the NI9237 min sampling rate is 1613 Hz so I used 2000 Hz for this and it has decimated at 100 Hz with the decimate.vi. 100 Hz is the the NI9219 maximum sampling frequency, so it should work.
Now, my problem is that I get multiple errors and the measured information excel file is empty. I also don't really know what to put in the box 'samples to read' in the DAQ assistant.
I hope someone can help me. My vi is included.
Kind regards
This is a buffer overflow error. You do not have your acquisition rate and the number of samples to read set correctly.
All 3 present data acquisition are defined for continuous samples. So as soon as they start execution of the buffer begins to fill to the top. Your two 9237 are set for 50 k to 2 k samples. So it takes 25 seconds for it to return data. (As a separate issue, you set your delay of 25 seconds, but it's probably too close to how long it takes to acquire data. It is always about to expire when he finally gets his last sample. Delay of minisicule may cause a time-out error).
Your 9219 is defined for 2 samples k to 100 Hz, so it only takes 20 seconds to get your data. (Still, the time-out is too close to that.)
What is going on? Your 9237 establish the rate of loop to 25 seconds. In 20 seconds, the 9219 returns 20 seconds worth of data, but collect 5 more seconds. Next iteration. After 15 seconds, yields 9219 20 seconds of data (5 front and 15 new) then proceeds to collect 10 more seconds in the buffer before the 9237 return their data and the loop iterates. Third iteration, 9219, 20 seconds worth of data (10 in the buffer zone, 10 new), then 15 seconds more to fill the buffer. After each iteration, the buffer fills with 5 seconds more. Do long enough and the buffer will overflow, and you will get this error.
Balance your data collection better. For the 9219, take samples from 2500 to 100 Hz, so you get 25 seconds worth of data. Or the return of all samples instead of a finite quantity. You would be better to use the functions underlying DAQmx that using the DAQ Assistant. Do you really want every iteration of the loop to take 20 or 25 seconds? For a long time that the VI will look like it is doing nothing. If you press the stop button, it will take up to about 50 seconds for the VI actually stop. Samples less per iteration.
Why do you collect so many samples at a high rate? You decimate them without making an average, so you just throw most of the data. You could collect samples of feweer at a lower rate.
Tags: NI Software
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