Glossary
R Series Intelligent DAQ 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 2
n
–
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.
V
IH
Volts, input high.
V
IL
Volts, input low.
V
OH
Volts, output high.
V
OL
Volts, output low.
V
rms
Volts, root mean square.
W
waveform
Multiple voltage readings taken at a specific sampling rate.
