System slows down during playback of 3 channels simultaneously

Hi all!

I'm at the stage of beginning with Labview (7.0, old I know ;() and try to encode a routine that reads data force 3 - axis load cell (400 Hz sampling frequency), it filters with low-pass filter simple software (cut 100 Hz) and the future written down into a data file if I use Matlab for plotting.) I met strange delay when I read the three channels at the same time and I'm trying to understand what has hurt.

Here are the steps in my code (I used > example as a base):

(1) I've initialized global channels, in which I put across the voltage according to the diagrams provided manufacturing

LC is physically connected to SG23/SC-2345 combo, which, in turnes, connected to the PXI-6221 DAQ card

(2) I've initialized a virtual channel for pxi-6221 so I can have control over its gain (+/-0 .5v, +/-1v, +/-5v, +/-10v) and the value of the gain for + / 1v, gives me the precision desired (at least I hope for that)

(3) wired global channels to the block of PXI

(4) set at 400 Hz sampling rate

(5) acquisition of start-up

(6) Split into three channels signal and connected a VI for filtering to one of them

The thing is, once I have started the program, everything is "moving" so slow that made me wander if I do things right.

Would be very happy comments

My VI:

The only thing you don't mention changing is the number of samples to be read. The VI you have posted a number of samples to read the value of 4000. If you change the sample rate of 400, then of course it will take 10 seconds to acquire as many samples.

Tags: NI Hardware

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