Tektronix KEITHLEY 2600B Series

Section 2: Sourcing and measuring Series 2600B System SourceMeter® instrument Reference Manual
2-54 2600BS-901-01 Rev. F/August 2021
The number of sweep steps actually performed is determined by the trigger count. See Triggering
(on page 4-1) for more information.
The formula for a logarithmic sweep is:
v
i
= A + kb
i
Where:
v
i
= The source value at source point i
i
= The index of points in the sweep (ranges from 0 to N − 1), where N is
the number of points in the sweep
k
= The initial source value as an offset from the asymptote
b
= The step size ratio
A
= The asymptote value
The asymptote is used to change the inflection of the sweep curve and allow it to sweep through zero.
The following figures depict the effect of the asymptote on the inflection of the sweep curve.
Figure 24: Increasing logarithmic sweep