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Glossary
SMB
SNR
software trigger
software triggering
source impedance
S/s
STC
switchless device
synchronous
system noise
T
TC
THD
THD+N
transducer
transfer rate
PCI-4451/4452/4453/4454 User Manual
a type of coaxial connector
signal-to-noise ratio—the ratio of the overall rms signal level to the rms
noise level, expressed in decibels
a programmed event that triggers an event such as data acquisition
a method of triggering in which you simulate an analog trigger using
software. Also called conditional retrieval.
a parameter of signal sources that reflects current-driving ability of voltage
sources (lower is better) and the voltage-driving ability of current sources
(higher is better)
samples per second—used to express the rate at which a DAQ device
samples an analog signal
system timing controller
devices that do not require dip switches or jumpers to configure resources
on the devices—also called Plug and Play devices
(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
a measure of the amount of noise seen by an analog circuit or an ADC when
the analog inputs are grounded
terminal count—the highest value of a counter
total harmonic distortion—the ratio of the total rms signal due to harmonic
distortion to the overall rms signal, in decibel or a percentage
signal-to-THD plus noise—the ratio in decibels of the overall rms signal to
the rms signal of harmonic distortion plus noise introduced
See sensor.
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
G-14
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