**Absolute pressure sensor** — A sensor that measures the input pressure in relation to zero pressure (a total vacuum on one side of the diaphragm).

**Accuracy** — (1) The degree of conformity of a measured or calculated value to its definition or with respect to a standard reference (*see* uncertainty). (2) The maximum error of a measured value with respect to its true theoretical value.

**Acceleration** — The rate of change of velocity. Acceleration has two characteristics: magnitude and direction.

**Acquisition time** — The time required for the front end of a DAQ board to capture an input signal and hold it to within a specified error band after a sample command is received.

**A/D** — Analog-to-digital

**ADC** — Analog-to-digital converter–An electronic device, often an integrated circuit that converts an analog voltage to a digital number.

**Analog-to-digital (A/D) conversion** — The process of converting a continuous analog signal to a digital value that represents that signal at the instant at which it was sampled.

**Algorithm** — A well-defined procedure that transforms one or more given input variables into one or more output variables in finite numbers of steps.

**ASIC** — Application-Specific Integrated Circuit–A proprietary semiconductor component designed and manufactured to perform a set of specific functions for a specific customer.

**Asynchronous** — (1) Hardware–A property of an event that occurs at an arbitrary time, without synchronization to a reference clock. (2) Software–A ...

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