Lambda SR1, Operation Manual, Page: 99 / 317

SR1 Operation 99
© 2014 Stanford Research Systems
previous point must be within twice the tolerance of of the current point, the 3rd-
previous point within 3 times the tolerance, etc. This is the most "lenient" of the
settling profiles and reflects the fact that the variability of many measurements
decreases as a function of time after a transient change.
Flat The measurement is considered settled using the flat profile when the previous
nPoints measurements are all within tolerance of the current measurement. This
is the "strictist" of all the settling profiles.
Sequential The measurement is considered settled if the current measurement is within
tolerance of the previous point, the previous point is within the tolerance of the
next previous point, etc., for a total of nPoints.
Average The result of the last nPoints measurements are averaged together and the
average result is considered the settled value
Delay
The delay parameters sets the amount of time after the sweep source has changed to a new value
before the analyzer begins to look for a settled measurement. If the sweep appears "glitchy" due to
transients from the moving sweep source, increasing the delay value can sometimes help to clean up
the sweep.
Threshold
At very low levels, the tolerance window y×(1 ± precision) becomes very small and it is possible that
some measurements will not settle. The threshold parameter sets a minimum value for the tolerance
window such that if
y×tolerance<threshold, the tolerance window becomes y±threshold .