Allen-Bradley 1444-TSCX02-02RB User Manual page 137

Measurement Definition Chapter 4
Figure 60 - Time Constant Effect: RMS Signal Detection, Signal Spike
A step change in a signal, as illustrated Figure 61, can indicate a real change in
machine condition, such as from a loss of mass event. In such a case the change
could be significant, possibly cause damage, and requires immediate action by
operators or the protection system itself.
As with a signal spike, an RMS-based measurement reacts quickly, but not
instantaneously, to the stepped increase in magnitude.
Figure 61 - Time Constant Effect: RMS Signal Detection, Step Change
Rockwell Automation Publication 1444-UM001D-EN-P - June 2018 137