From 6:00 PM CST Friday, Feb 15th - 2:00 AM CST Sunday, Feb 17th, ni.com will be undergoing system upgrades that may result in temporary service interruption.

We appreciate your patience as we improve our online experience.

Table Of Contents

Jitter Overview for Control Applications

Last Modified: November 16, 2017

For control applications, the amount of time that the loop cycle time varies from the desired time is called jitter. The maximum amount that a loop cycle time varies from the desired loop cycle time is called maximum jitter.

In real-time systems, jitter is bounded. For instance, air bags must deploy within fractions of a second after a critical impact and are thus bound to a maximum jitter. In non-real-time systems, jitter is unbounded—or very large. Waiting for a bus is an example. Suppose that according to the schedule, the bus is supposed to arrive at 11:00 a.m. but actually arrives at 11:05 a.m. one day, 11:30 a.m. the next day, and has a flat tire the day after that. There is no bound on how late the bus could arrive.


Recently Viewed Topics