MODEL AT3
3 – 9
3.b. The user must decide what type of curve fitting to perform on the data, and this Is done in the
"Cal Type" menu. See Figure 3-15.
Lookup Table
Best Fit Line
Cal Type:
Best Fit Parabola
3
rd
Degree Poly
4 Degree Poly
Figure 3-15: Cal Type Menu
3.c. Once the "Cal Type" is chosen, the user presses the "Fit Sample Data" menu to perform the
curvefitting calibration routine using the active samples.
NOTE: If "Lookup Table" is chosen, the instrument will do a "connect the dots" type of calibration
on all the active samples. This can be viewed by pressing the "Plot" menu, which graphs all the
samples and the resultant curvefit.
If "Best Line Fit" is chosen, upon pressing the "Fit Sample Data" menu the instrument will
calculate the 2 coefficients that define the line that best matches the active samples. "Best Fit
Parabola" is similar except it will require 3 coefficients, and "3rd Order Poly" and "4th Order Poly"
require 4 and 5 coefficients respectively. In the "Coefficients" menu are the parameters calculated
from polynomial curvefitting to define the curve. There is always one more coefficient than the
degree of the polynomial. See Table 3-2. If a lookup table is used the "COEFFICIENT" menu is
disabled.
Содержание Monitek AT3
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