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attenuation -to decrease the magnitude of a signal.

attenuation -as the sound/vibration energy propagates, it will undergo losses. The losses are known as attenuation, and are often measured in dB. For general specifications, the attenuation may be tied to units of dB/ft.

attribute -a nongraphical feature of a part, such as color. audible range -the range of frequencies that the human ear can normally detect from 16 to 20,000 Hz. automatic control -a feedback of a system state is compared to a desired value and the control value for the

system is adjusted by electronics, mechanics and/or computer to compensate for differences. automated -a process that operates without human intervention. auxiliary power -secondary power supplies for remote or isolated systems. AWG (American Wire Gauge) -specifies conductor size. As the number gets larger, the conductors get

smaller.

35.2 B

B-spline -a fitted curve/surface that is commonly used in CAD and graphic systems. backbone -a central network line that ties together distributed networks. background -in multitasking systems, processes may be running in the background while the user is

working in the foreground, giving the user the impression that they are the only user of the machine (except when the background job is computationally intensive).

plc glossary -35.3

background suppression -the ability of a sensing system to discriminate between the signal of interest, and background noise or signals.

backplane -a circuit board located at the back of a circuit board cabinet.

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