Section 6: Clarius
Model 4200A-SCS Parameter Analyzer Reference Manual
6-268
4200A-901-01 Rev. C / February 2017
Identify data analysis requirements
In many cases, you may already know a needed analysis formula, even before running a test. In fact,
for a test, you may create a real-time formula in advance so that you can monitor its output during a
test, either in the Analyze sheet or graph.
However, in other cases, you may decide to perform an analysis after a review of existing test data.
The Formulator functions to use and the data to be included in the Formulator calculations must be
evaluated to meet your requirements. The following topics illustrate one such evaluation.
Determining the type of calculation: an example
For example, after looking at the BJT saturation voltage plot below, you need to have a better look at
the point where the slope of the saturation plateau becomes constant.
Figure 382: Formulator example data
You might decide to apply the function
REGFIT
to the CollectorV values (and corresponding
CollectorI values) between 1 V and 3 V. The line generated by
REGFIT
, when co-plotted with the
existing curve, should depart from the plateau at the point of curvature.
The following topics apply the
REGFIT
function to the data in the above figure to illustrate use of the
Formulator
.
Determining range data for a calculation: an example
Many Formulator functions do not require you to specify row numbers (indices) as arguments.
However, some Formulator functions, such as
REGFIT
, require you to specify the range of data to be
included in the calculation (typically as the row numbers (indices) for the first and last values to be
included (refer to
Using the Formulator functions
(on page 6-226)). This requirement allows you to
apply a calculation to only a specific part of the data.
To find the corresponding row numbers (indices) for that specific part of the data, check the Run
worksheet. For example, referring to the figure below, you might decide to apply
REGFIT
only to the
CollectorV
values between 1 V and 3 V. Looking at the Analyze sheet for this data, you note that the
CollectorV
values between 1 V and 3 V are located between rows (indices) 52 and 152. This is the
range information that you need to create the regression analysis equation using
REGFIT
.
