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A chassis ground is a link between different metallic parts of a machine to ensure an electrical connection between them. [1] Examples include electronic instruments and motor vehicles. Usages
Signals are defined with respect to signal ground, which may be connected to a power ground. A system where the system ground is not connected to another circuit or to earth (in which there may still be AC coupling between those circuits) is often referred to as a floating ground, and may correspond to Class 0 or Class II appliances.
Multiple Un-referenced End-Circuits with a single return – isolation between several input signals and circuit chassis/common ground. Subsystem with Isolated Common – isolation between signal input and common ground. Common Chassis Ground – isolation between circuit common and chassis (chassis grounded).
The cable has a ground or shield conductor which is connected to the chassis ground of each component. The driver amplifier in component 1 (left) applies signal V 1 between the signal and ground conductors of the cable. At the destination end (right), the signal and ground conductors are connected to a differential amplifier.
The role “ground” may be ambiguous in systems that isolate different kinds of grounds (typical isolated grounds are analog signal ground, digital signal ground, AC power ground, DC power ground, and chassis ground). If different kinds of ground paths are in separate paths in a connector, the analysis should treat them as separate signals.
A few two-signal-wire systems lingered on; the Cooke and Wheatstone two-needle system used on British railways, [10] and the Foy-Breguet telegraph used in France. [11] With the reduction in the number of signal wires, the cost of the return wire was much more significant, leading to earth return becoming the standard. [12]
Floating grounds can be dangerous if they are caused by failure to properly ground equipment that was designed to require grounding because the chassis can be at a very different potential from that of any nearby organisms, who then get an electric shock upon touching it. Live chassis TVs, also known as hot chassis, where the set's ground is ...
The signal V 1 is applied to the conductor of signal cable S by a line driver in component 1. The cable has a ground conductor which is attached to the metal chassis of each component. At the destination end in component 2, the signal and ground are connected to a differential amplifier to produce the signal V 2.