COMMON COMPLAINT AFTER SMART METER INSTALLATION-AUDIBLE RINGING!!!

MAJOR COMPLAINT AFTER SMART METER INSTALLATION IS THE CONSTANT AUDIBLE “RINGING” BEING HEARD.

Ringing (signal)

From Wikipedia, the free encyclopedia
This article is about ringing in electronics and signals generally. For ringing artifacts in signal processing, particularly image processing, see ringing artifacts.

An illustration of overshoot, followed by ringing and settle time.

In electronics, signal processing, and video, ringing is unwanted oscillation of a signal, particularly in the step response (the response to a sudden change in input). It is also known as hunting. It is closely related to overshoot, generally occurring following overshoot, and thus the terms are at times conflated.

It is also known as ripple, particularly in electricity or in frequency domain response.

Electricity[edit]

In electrical circuits, ringing is an unwanted oscillation of a voltage or current. It happens when an electrical pulse causes the parasitic capacitances and inductances in the circuit (i.e. those that are not part of the design, but just by-products of the materials used to construct the circuit) to resonate at their characteristic frequency.[1] Ringing artifacts are also present in square waves; see Gibbs phenomenon.

Ringing is undesirable because it causes extra current to flow, thereby wasting energy and causing extra heating of the components; it can cause unwanted electromagnetic radiation to be emitted[citation needed]; it can delay arrival at a desired final state (increase settling time); and it may cause unwanted triggering of bistable elements in digital circuits. Ringy communications circuits may suffer falsing.

Ringing can be due to signal reflection, in which case it may be minimized by impedance matching.

http://en.wikipedia.org/wiki/Ringing_(signal)