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DAMPED WAVE. A sinusoidal wave in which the amplitude steadily decreases with time. Often associated with energy loss.
DAMPING. The process of smoothing out oscillations. The progressive decay with time in the amplitude
of the free oscillations in a circuit. The progressive diminution with time of
certain quantities characteristic of a phenomenon. In a meter, this process is used to keep the
pointer of the meter from over-shooting the correct reading. A mechanical or electrical technique
used in synchro receivers to prevent the rotor from oscillating or spinning. Damping is also used in
servosystems to minimize overshoot of the load.
D'ARSONVAL METER MOVEMENT. The permanent-magnet moving-coil movement used in most
meters.
DATA ENCRYPTION STANDARD {DES}. A cryptographic algorithm for the protection of
unclassified computer data and published by the National Institute of Standards and Technology in
Federal Information Processing Standard Publication 46-1.
DATA PROCESSING. The execution of a systematic sequence of operations performed upon data.
Synonymous with information processing.
DATA TRANSFER RATE. The average number of bits,
characters, or blocks per unit time passing between corresponding equipment in a data transmission
system.
DATA TRANSMISSION. The transfer of information from one place to another or from one part of a
system to another. The sending of data from one
place to another by means of signals over a channel.
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