| | McGraw-Hill AccessScience: Servomechanism (Site not responding. Last check: 2007-10-21) |
 | | The term servomechanism, or servo for short, is sometimes used interchangeably with feedback control system (servosystem). |
 | | In a narrower sense, servomechanism refers to the feedback control of a single variable (feedback loop or servo loop). |
 | | In the strictest sense, followed in this article, the term servomechanism is restricted to a feedback loop in which the controlled quantity or output is mechanical position or one of its derivatives (velocity and acceleration). |
| www.accessscience.com /Encyclopedia/6/61/Est_616600_frameset.html?doi (145 words) |