Blair,
you asked on Thu, 3 Jun 2004 08:49:54 -0400
Assuming you know the type of the non-linear adjustment function, it would be possibel to use the 2nd signal data to get the best fit coefficients and to use these to adjust the first signal data.I have a peculiar request - I want to take a 4-20 ma level transmitter signal and adjust it slightly by a non-linear equation based on another 4-20 ma signal. I can envisage several ways to do this involving custom hardware, some including a processor for the function, but I was wondering if anyone knows of a commercial product which would be capable of this off-the-shelf?
At least in LV7.1 theres a 'curve fit' Express VI (VIs/Analyze/Mathematics/Curve Fitting/) that can be configured to use any (at least really many types of) transfer function(s). It can deliver the calculated function coefficients and can even use limited iterations for that calculation. Use a formula node or similar structures to create the adjustment and to apply it to your data.
So if I got you right, there's no need for external HW, LV can do it alone.
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