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Glossary
© National Instruments Corporation G-11 6023E/6024E/6025E User Manual
SISOURCE SI counter clock signal
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.
SOURCE source signal
S/s samples per second—used to express the rate at which a DAQ board
samples an analog signal
STARTSCAN start scan signal
STC system timing controller
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
T
TC terminal count—the highest value of a counter
THD total harmonic distortion
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
TRIG trigger signal
trigger any event that causes or starts some form of data capture
TTL transistor-transistor logic
U
UI update interval
unipolar a signal range that is always positive (for example, 0 to +10 V)
UISOURCE update interval counter clock signal