National Instruments Data Acquisition Device NI USB-621x User Manual page 171

RSE
S
s
S
sample counter
scan
scan interval
scan rate
sensor
signal conditioning
signal source
signals
single trigger mode
© National Instruments Corporation
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.
Seconds.
Samples.
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.
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.
Controls how often a scan is initialized; is regulated by the AI Sample
Clock signal.
Reciprocal of the scan interval.
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.
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.
A generic term for any instrument in the family of signal generators.
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.
When the arbitrary waveform generator goes through the staging list only
once.
G-13
Glossary
NI USB-621x User Manual