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This is the compliment to an acid.
alpha rays -ions that are emitted as the result of atomic fission or fusion.
alphanumeric -a sequence of characters that contains both numbers and letters.
ALU (Arithmetic Logic Unit) -a part of a computer that is dedicated to mathematical operations.
AM (Amplitude Modulation) -a fixed frequency carrier signal that is changed in amplitude to encode a
change in a signal.
ambient -normal or current environmental conditions.
ambient noise -a sort of background noise that is difficult to isolate, and tends to be present throughout the
volume of interest.
ambient temperature -the normal temperature of the design environment.
analog signal -a signal that has continuous values, typically voltage.
analysis -the process of review to measure some quality.
and -a Boolean operation that requires all arguments to be true before the result is true.
plc glossary -35.2
annealing -heating of metal to relieve internal stresses. In many cases this may soften the material. annotation -a special note added to a design for explanatory purposes. ANSI (American National Standards Institute) -a developer of standards, and a member of ISO. APF (All Plastic Fibre cable) -fiber optic cable that is made of plastic, instead of glass. API (Application Program Interface) -a set of functions, and procedures that describes how a program will
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