National-instruments Data Acquisition Device NI USB-621x Manual de usuario descargar pdf (Pagina 171)

Glossary

RSE Referenced Single-Ended mode—All measurements are made with respect

to a common reference measurement system or a ground. Also called a

grounded measurement system.

s Seconds.

S Samples.

sample counter The clock that counts the output of the channel clock, in other words, the

number of samples taken. On devices with simultaneous sampling, this

counter counts the output of the scan clock and hence the number of scans.

scan One or more analog or digital input samples. Typically, the number of input

samples in a scan is equal to the number of channels in the input group. For

example, one pulse from the scan clock produces one scan which acquires

one new sample from every analog input channel in the group.

scan interval Controls how often a scan is initialized; is regulated by the AI Sample

Clock signal.

scan rate Reciprocal of the scan interval.

sensor A device that responds to a physical stimulus (heat, light, sound, pressure,

motion, flow, and so on), and produces a corresponding electrical signal.

Primary characteristics of sensors are sensitivity, frequency range, and

linearity.

signal conditioning 1. Electronic equipment that makes transducer or other signals suitable in

level and range to be transmitted over a distance, or to interface with

voltage input instruments.

2. The manipulation of signals to prepare them for digitizing.

signal source A generic term for any instru

ment in the family of signal generators.

signals Signals are waveforms containing information. Although physical signals

can be in the form of mechanical, electromagnetic, or other forms, they are

most often converted to electronic form for measurement.

single trigger mode When the arbitrary waveform generator goes through the staging list only

once.

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National-instruments Data Acquisition Device NI USB-621x Manual de usuario Pagina 171