Glossary
NI 781xR User Manual G-6 © National Instruments Corporation
S
s Seconds.
S Samples.
S/s Samples per second—Used to express the rate at which a DAQ board
samples an analog signal.
signal conditioning The manipulation of signals to prepare them for digitizing.
slew rate The voltage rate of change as a function of time. The maximum slew rate
of an amplifier is often a key specification to its performance. Slew rate
limitations are first seen as distortion at higher signal frequencies.
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.
thermocouple A temperature sensor created by joining two dissimilar metals. The
junction produces a small voltage as a function of the temperature.
TTL Transistor-transistor logic.
two’s complement Given a number x expressed in base 2 with n digits to the left of the radix
point, the (base 2) number 2n – x.
V
V Volts.
VDC Volts direct current.
VHDCI Very high density cabled interconnect.
VI Virtual Instrument—Program in LabVIEW that models the appearance and
function of a physical instrument.
VIH Volts, input high.
VIL Volts, input low.