Measuring Control
System Performance
Several measures of performance can be derived from a step response.
Parameters such as rise time, overshoot, delay time, and settling time are
measured in the time domain. The Histogram/Time instrument mode provides
the highest accuracy time analysis. Time analysis markers measure the critical
time parameters. See figure 5-3.
The rise time of a step response provides a measure of how fast a system can
initially achieve the desired output level. The maximum overshoot provides a
relative measure of the maximum output level resulting from a specific input.
The steady-state deviation indicates a constant error in achieving a desired
output. Settling time is a measure of how long it takes the system to settle to
its steady-state value. The settling time can be interpreted as a relative measure
of stability with short settling time considered more stable than a long settling
time.
Agilent 35670A
Measuring Control Systems Operator's Guide
5-6
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