Glossary
©NationalInstruments Corporation G-11 6023E/6024E/6025EUser Manual
SISOURCE SI counter clock signal
softwaretrigger ap rogrammed eventthat triggers an event such as data acquisition
softwaretriggeri ng am ethod of triggering in which you simulate an analog trigger using
software.Also called c onditional retrieval.
SOURCE sourcesignal
S/s samplesper 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 eventthat is synchronized to a reference
clock (2) software—aproperty of a function th at beginsan operation and
returns only when the operation is complete
TTC terminalcount—the highest value of a counter
THD totalharmonic distortion
THD+N signal-to-THDplus noise—the ratio in decibelsof the overall rms signal to
the rms signal of harmonic distortion plus noise introduced
TRIG trigger signal
trigger anyevent that causes or starts some form of data capture
TTL transistor-transistor logic
UUI update interval
unipolar a signal range that is always positive(for example, 0 to +10 V)
UISOURCE updateinterval counter clock signal