Modelling specified logarithmic Alpha characteristics

Fit to logarithmic Alpha characteristics

The following slideshow containing reproductions of the piecewise fittings to measured logarithmic Alpha characteristics.

(1/6) Alpha logarithmic characteristic 05A.

(2/6) Alpha logarithmic characteristic 10A.

(3/6) Alpha logarithmic characteristic 15A.

(4/6) Alpha logarithmic characteristic 20A.

(5/6) Alpha logarithmic characteristic 25A(K).

(6/6) Alpha logarithmic characteristic 30A.

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Transitional values of piecewise function for linear characteristics

The corresponding transitional values for these functions are shown in the below table.

*Optimised transition points of the general cubic-linear piecewise function, fit to the logarithmic potentiometer characteristic specified on the Alpha website. Values are rounded to 3 decimal places.*
		05A	10A	15A	20A	25A(K)	30A
	x	y	y	y	y	y	y
-	0.000	0.000	0.000	0.000	0.000	0.000	0.000
Lin.	0.050	0.003	0.003	0.003	0.004	0.002	0.004
Cub.	0.300	0.015	0.028	0.063	0.084	0.123	0.151
Lin.	0.510	0.057	0.111	0.162	0.210	0.259	0.311
Cub.	0.700	0.284	0.363	0.410	0.443	0.501	0.542
Lin.	0.920	0.954	0.959	0.958	0.952	0.954	0.965
Cub.	0.970	0.999	0.999	1.000	1.000	0.999	1.000
Lin.	1.000	1.000	1.000	1.000	1.000	1.000	1.000