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Glossary
Shannon Sampling
Theorem
S/H
signal conditioning
SISOURCE
SNR
software trigger
software triggering
SOURCE
SS
S/s
STARTSCAN
STC
switchless device
synchronous
system noise
PCI-6023E/6024E/6025E User Manual
a law of sampling theory stating that if a continuous bandwidth-limited
signal contains no frequency components higher than half the frequency
at which it is sampled, then the original signal can be recovered without
distortion
sample-and-hold—a circuit that acquires and stores an analog voltage on a
capacitor for a short period of time
the manipulation of signals to prepare them for digitizing
SI counter clock signal
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.
source signal
simultaneous sampling—a property of a system in which each input or
output channel is digitized or updated at the same instant
samples per second—used to express the rate at which a DAQ board
samples an analog signal
start scan 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
G-14
© National Instruments Corporation
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