ground loop

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ground loop

[′grau̇nd ‚lüp]
(aerospace engineering)
A sharp, uncontrollable turn made by an aircraft on the ground during landing, taking off, or taxiing.
(communications)
Return currents or magnetic fields from relatively high-powered circuits or components which generate unwanted noisy signals in the common return of relatively low-level signal circuits.
(electricity)
Potentially detrimental loop formed when two or more points in an electric system that are nominally at ground potential are connected by a conducting path.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

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Simplex burner.
i. An uncontrolled turn on the ground either on takeoff or, more often, on landing in a tail-wheel aircraft. Also called a ground loop
ii. To turn a propeller by hand to start the engine.
iii. To calibrate compass deviation by recording its values at predetermined intervals and correcting the deviation to the extent possible.
iv. The sudden yaw of a multiengine airplane when one of the engines, especially the one away from the centerline, fails.
v. In aerial photography, it is the angle measured in the plane of the photograph from the positive y-axis clock-wise to the nadir point.
An Illustrated Dictionary of Aviation Copyright © 2005 by The McGraw-Hill Companies, Inc. All rights reserved

ground loop

A circular path created between the data lines and the ground wires when electronic devices communicate with each other. When systems have earth grounds through different power sources, differences in reference voltages can cause problems for various reasons (see inter-system ground noise). See ground.


The Ground Loop
The ground loop is created because all the equipment is wired to earth ground.
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Samaritan House's heat pump installation, which uses a constant temperature water source, appears to offer considerable capital savings over a conventional borehole ground loop system, with most savings coming from the ground loop.
Studies of cold weather GHSP installations question the long term effect of the thermal balance in the ground loop heat exchanger.
"We wanted to do all we could to control costs," she says, "so we put the entire project out to bid - 33 heat pumps, and 33 ground loops."
Too often basic video is explained with little time invested in discussing system power or the potential for ground loops that can totally disable the best system.
Vertical systems circulate a mixture of water and antifreeze deep down horizontal systems employ more shallowly buried ground loops.
In addition, 3-way isolation protects devices from transient surges and ground loops on the data line.
The MEP firms designed the entire system including the ground loops and controls and avoided the temptation of defaulting loop and control design to contractors or vendors.
* It is highly susceptible to ground loops, electromagnetic interference (EMI), and electrostatic discharges (ESD).
External influences such as common mode noise or ground loops can create substantial problems for measurement systems.
A [+ or -]500-V galvanic isolation barrier prevents ground loops. The DT9826 is available as a board-level OEM version for embedded test applications or installed in a metal BNC connection box to facilitate sensor connections.