A set of rules or detailled plan, with a finite number of steps, for solving a problem. An algorithm can be used as a model for solving a problem, or for creating a computer program.

A false lower frequency component that appears in analog data reconstructed from original data acquired at an insufficient sampling rate.

The effect in which low frequencies, that did not exist, appear in data after it is digitized by a data acquisition device. This is due to frequencies in the analog input that are more than half the sample rate.

Electric current whose flow alternates in direction. The number of times the current changes direction in one second is called frequency.

The electronic device that amplifies an analog input signal. In a data acquisition device the amplifier precedes the A/D converter and amplifies the signal to a level that the A/D converter can accept. See Gain.

The size or magnitude of a signal.

A signal or number that can have any value between two extremes, such as temperature. It can change continuously, unlike digital signals that change in discrete steps. See Digital.

An analog signal that is measured by a data acquisition device. Analog inputs refer to the number and type of analog input channels available on a data acquisition board.

An analog signal that is generated by a data acquisition device and sent out to be measured or used by another device. Analog outputs refer to the number and type of analog output channels available on a data acquisition board.

Combination of devices designed to manipulate physical quantities that are represented in analog form.