Glossary
NI PXI-7831R User Manual G-8 © National Instruments Corporation
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.
VOH Volts, output high.
VOL Volts, output low.
Vrms Volts, root mean square.
W
waveform Multiple voltage readings taken at a specific sampling rate.