eDAQ Picostat, User Manual, Page: 77 / 122

Chapter 5 — Techniques 73
First lock in a value for c , then
try guesses for a and b until an
approximate fit is obtained
Iterate by clicking the Fit button, refining a
and b only. If the initial guesses are close
enough, then a curve of better fit with new
vales for
a and b will be obtained.
Unlock c , and iterate again. A curve
of best fit should be obtained.
Usually use ‘t=0
at start of block’
Define the Cottrell
relationship as a new
equation
At the time of writing the
Curve Fit extension is
only available for Chart
for Macintosh.
Figure 5–12
Fitting a Cottrell equation
to data with the Curve Fit
extension.