LabVIEW
Convert U16 to scaled data
You have a few problems, mostly stemming from not understanding some diagram structures:
- You are passing the 2D array of integers into a for-loop that is wired to loop once. That's not much of a loop, now, is it?
- Within the loop you're peeling off column zero (since the loop is only running once), and then multiplying the values by some constant. Not sure what that constant is, since its value is in case 0 of the case structure, which you don't show.
- You're then creating a 2D array of this (not sure why), which you're feeding into a subVI that seems to have been written by you. Without seeing what this VI is doing, it's impossible to say if it's doing it right.
Message Edited by smercurio_fc on 05-04-2007 09:05 AM
You can still simplify your VI by using the for-loop correctly. Basically, you want to scale each channel, and get the RMS value for each channel. Well, use an auto-indexed for-loop to do that, as shown in this picture (Note: there is a built-in RMS function - you don't have to write your own):
It's not clear why you want to write integer values to file. Since you're scaling the data, you're going to get a floating point value unless your scaling factor is an integer. Is it? If not, you should be writing the floating point numbers. Otherwise, you're saving truncated data.
It's also not clear what your problem is. What, exactly, doesn't work? Is it that you're not getting the data saved, or you're only getting the data from the last iteration? Your loop writes data during each iteration, but I'm not sure about the function you're using to write the data. What version of LabVIEW are you using? Is that function set up to append data to the file, or does it overwrite each time?
It's not clear why you want to write integer values to file. Since you're scaling the data, you're going to get a floating point value unless your scaling factor is an integer. Is it? If not, you should be writing the floating point numbers. Otherwise, you're saving truncated data.
It's also not clear what your problem is. What, exactly, doesn't work? Is it that you're not getting the data saved, or you're only getting the data from the last iteration? Your loop writes data during each iteration, but I'm not sure about the function you're using to write the data. What version of LabVIEW are you using? Is that function set up to append data to the file, or does it overwrite each time?
Message Edited by smercurio_fc on 05-04-2007 09:59 AM
