Keithley 4200A-SCS Reference Manual

Model 4200A
-SCS Parameter Analyzer Reference Manual Section 6:
Clarius
4200A-901-01 Rev. C / February 2017 6-255
LOGFITA Formulator function
Performs a base-10 log-linear fit.
Usage
LOGFITA(VX, VY, STARTPOS, ENDPOS)
VX
The name of any column (vector) listed under Columns
VY
The name of any column (vector) listed under Columns
STARTPOS
For the range of X and Y values to be logarithmically fitted, the row number (index)
of the starting values
ENDPOS
For the range of X and Y values to be logarithmically fitted, the row number (index)
of the ending values
Details
Performs a base-10 log-linear fit as follows:
• Fits the following logarithmic relationship to a specified range of values in two columns (vectors)
(one column, VX, containing X values and the other column, VY, containing Y values):
Y = LOGFITA + LOGFITB * log(X)
where LOGFITA and LOGFITB are fit constants.
• Using the above logarithmic relationship, returns the value of the constant LOGFITA.
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.
Example
OFFSET = LOGFITA(GATEV, DRAINI, 30, 50)
Also see
LOGFIT (on page 6-254)
LOGFITB (on page 6-256)

Keithley 4200A-SCS Specifications

General

Brand	Keithley
Model	4200A-SCS
Category	Measuring Instruments
Language	English