![background image](http://html1.mh-extra.com/html/national-instruments/ni-447-series/ni-447-series_user-manual_3489585073.webp)
Glossary
G-12
ni.com
sensor
a device that responds to a physical stimulus (heat, light, sound, pressure,
motion, flow, and so on), and produces a corresponding electrical signal
Shannon Sampling
Theorem
See
.
signal conditioning
the manipulation of signals to prepare them for digitizing
SMB
a type of coaxial connector
SNR
signal-to-noise ratio—the ratio of the overall rms signal level to the rms
noise level, expressed in decibels
software trigger
a programmed event that triggers an event such as data acquisition
software triggering
a method of triggering in which you simulate an analog trigger using
software. Also called conditional retrieval.
STC
system timing controller
switchless device
devices that do not require dip switches or jumpers to configure resources
on the devices—also called Plug and Play devices
synchronous
(1) hardware—a property of an event that is synchronized to a reference
clock; (2) software—a property of a function that begins an operation and
returns only when the operation is complete
system noise
a measure of the amount of noise seen by an analog circuit or an ADC when
the analog inputs are grounded
T
THD
total harmonic distortion—the ratio of the total rms signal due to harmonic
distortion to the overall rms signal, in decibel or a percentage
THD+N
signal-to-THD plus noise—the ratio in decibels of the overall rms signal to
the rms signal of harmonic distortion plus noise introduced
transducer
See
sensor.
transfer rate
the rate, measured in bytes/s, at which data is moved from source to
destination after software initialization and set up operations; the maximum
rate at which the hardware can operate