Exponential Fit to detect fails on capacitor charge and discharge curves

[telles_s]

 The attached VI exemplifies the use of Exponential Fit function to detect fails on capacitor charge and discharge curves.

The "capacitor_curve_exp_fit.vi" works as follow:

1. Read curve samples from "cap_samples.bin" file. There are 2 charging curve samples, one curve ok and another with fail;

2. Create x array to be used by exponential fit function;

3. Calculate the best exponential fit curve using Leas Square, Least Absolute Residual or Bisquare fitting methods;

4. Calculate the SSE, R-square and RMSE statistical parameters that represent how well the fitted curve matches the acquired curve;

5. Calculate the distance between each equivalent point of the fitted and acquired curve;

6. Classify as approved or rejected based in the distance limit criteria.

VI screenshots

OBS: extract "cap_samples.bin" file in the same VI folder.