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Glossary of terms used on this site

There are 823 entries in this glossary.
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Term Definition
Alphanumeric

A character set that contains both letters and digits.

ALU

Arithmetic Logic Unit. The part of a CPU where binary data is acted upon with mathematical operations.

Alumel

An aluminum nickel alloy used in the negative leg of a Type K thermocouple (Trade name of Hoskins Manufacturing Company).

Ambient Compensation

The design of an instrument such that changes in ambient temperature do not affect the readings of the instrument.

Ambient Conditions

The conditions around the transducer (pressure, temperature, etc.).

Ambient Pressure

Pressure of the air surrounding a transducer.

Ambient Temperature

The average temperature of air surrounding the device or equipment.

Ammeter

An instrument used to measure current.

Ampere (amp)

A unit used to define the rate of flow of electricity (current) in a circuit; units are one coulomb (6.28 x 10^18 electronics) per second.

Amplifier

A device which draws power from a source other than the input signal and which produces as an output an enlarged reproduction of the essential features of its input.

Amplitude

A measurement of the distance from the highest to the lowest excursion of motion, as in the case of mechanical body in oscillation or the peak-to-peak swing of an electrical waveform.

Amplitude Span

The Y-axis range of a graphic display of data in either the time or frequency domain. Usually a log display (dB) but can also be linear.

Analog

A parameter which varies in a continuous, rather than incremental or discrete-step manner.

Analog Input Module

An I/O module that contains circuits that convert analog dc input signals to digital values that can be manipulated by the processor. By implication, these analog inputs are usually direct (i.e., a data table value directly reflects the analog signal value).

Analog Meter

A scale and pointer meter capable of indicating a continuous range of values.

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