Keithley 4200A-SCS Reference Manual

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Keithley 4200A-SCS Reference Manual Manual pdf 528 page image

Model 4200A-SCS Parameter Analyzer Reference Manual Section 6: Clarius4200A-901-01 Rev. C / February 2017 6-259POLYNFIT Formulator functionPOLYNFIT (n th order) does polynomial approximation from the 1st order to the 9th order.UsagePOLYNFIT(VX, VY, ORDER, STARTPOS, ENDPOS)VX The name of any column (vector) listed under ColumnsVY The name of any column (vector) listed under ColumnsORDER The orderSTARTPOS The row number (index) of the first set of X and Y valuesENDPOS The row number (index) of the second set of X and Y valuesDetailsEnables quadratic regression line fitting. It allows a set of data to best fit an equation of the parabolaY = aX2 + bX + c.The a, b, and c values of the quadratic equation are returned.The quadratic regression line fit functions are useful for deriving the defect density when you use thedrive-level capacitance profiling (DLCP) technique.If a VX or VY value at either STARTPOS or ENDPOS is an invalid number (that is, the value is #REF),the function will not return a valid result.Also seePOLY2COEFF (on page 6-257)POLY2FIT (on page 6-258)