Data Acquisition

A/D conversion timeAddressAddress registerAFBAlgorithmAlias frequencyALUAnalogAnalog input boardAnalog output boardAnalog slope channelAnalog trigger channelANSIThis is the length of time a board requires toconvert an analog signal into a digital value. Thetheoretical maximum speed (conversions/second)is the inverse of this value. See Speed/TypicalThroughput.Designator for the location of data in a storagedevice; allows the retrieval of data by reading thecontents of a specific location.Also, the identity of a peripheral device. These(normally unique) allow individual devices on asingle communications line to recognize andrespond to messages directed at them.A register that holds the address of a locationcontaining a data item called for by an instruction.Access frame buffer.Normally used as a basis for writing a computerprogram. This is a set of rules with a finitenumber of steps for solving a problem.A false lower frequency component that appearsin data reconstructed from original data acquiredat an insufficient sampling rate (less than twotimes the maximum frequency of the originaldata).Arithmetic logic unit.A continuous real-time phenomenon in which theinformation values are represented in a variableand continuous waveform.Printed circuit board converting incoming analogsignals to digital values.Printed circuit board converting outgoing digitalvalues to analog signals.Sampling can be triggered at a user-selectablepoint on an incoming analog slope. Triggeringcan be set to occur at a specific threshold level,including selected modes of ± slope level high, andlevel low.An auxiliary analog channel, in addition to theanalog input channels to be measured, which isused solely for an analog trigger signal.American National Standards Institute. Theprincipal organization developing standards in theUSA. Many of the ANSI standards are of greatinterest to the engineering and software fields.