Formulator Function Reference - Keithley 4200-SCS Reference Manual

Section 6: Keithley Interactive Test Environment (KITE)
In Graph tab graphs, you can directly perform composite line fits that are equivalent to the
following groups of individual Formulator line fits: EXPFIT, EXPFITA, and EXPFITB; LINFIT,
LINFITSLP, LINFITXINT, and LINFITYINT; LOGFIT, LOGFITA, and LOGFITB; REGFIT,
REGFITSLP, REGFITXINT, and REGFITYINT; TANFIT, TANFITSLP,
TANFITXINT, and TANFITYINT. However, the fit lines and parameters only display in the graphs.
They are unavailable for use in calculations. Refer to
Performing on-graph line fits.
Table 6-14
Correspondence between Graph tab and Formulator line fits
Formulator fit functions*
LINFIT,
REGFIT
EXPFIT
LOGFIT
TANFIT
* These functions calculate individual fit lines and parameters that may be used in other calculations. By
contrast, the Graph tab calculates and displays only the fit line and all fit parameters.

Formulator function reference

Each of the Model 4200-SCS Formulator functions are described below.
ABS: Formulator function
Purpose
Format
Example
Remarks
ACOS: Formulator function
Purpose
Format
Example
Remarks
6-292
LINFITYINT LINFITSLP
REGFITYINT REGFITSLP
EXPFITA EXPFITB
LOGFITA LOGFITB
TANFITYINT TANFITSLP
Calculates the absolute value of each value in the designated column (vector) or the
absolute value of any operand.
ABS(X)
Where: X = The name of any column (vector) listed under Columns or any operand.
F2 = ABS(GateI)
This function can be used to perform calculations in real time, while a test is executing.
Returns the arc cosine of each value in a designated column (vector) under Columns
or any operand.
ACOS(X)
Where: X = The name of any column (vector) listed under Columns
or any operand.
F1 = ACOS(DRAINI)
Returns the value in radians.
Return to Section Topics
Model 4200-SCS Reference Manual
Table 6-14 and to
Corresponding
Graph tab line fit
LINFITXINT Linear
REGFITXINT Regression
————— Exponential
————— Logarithmic
TANFITXINT Tangent
4200-901-01 Rev. S / May 2017