Fit.VI exponential fits well

Any attempt to use the "exponential" Fit.vi to find the time constant the time of settling so that loop of PID parameters can be calculated from these data of open loop is attached. The orange line is the data, I'm trying to adapt. The blue lines is the exponential fitted with "Fit.vi" data output These data are the temperature difference between a thermoelectric cooler element in response to a radical change in the current. I know that the answer will be not exactly exponential because this response is actually the sum of many exponential as the heat is different paths. But all I need is a rough idea of the time constant of the rise of dominant, and that will be good enough.

There are four fits that begin when each step response begins. The outcome of each adjustment is far away. The adjustment does not start at the same temperature the step response is. And the curvature is the inverse of the adjusted data. What could be wrong here? Is there a better vi to use to get this exponential time constant?

I use the default settings for all entries to 'exponential Fit.vi.

Your data has a big lag, so you must make sure that the offset is not fixed (by default, it is set to zero!). Change the third parameter limits to [-inf... + inf] and the rest will fall into place.

Tags: NI Software

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