Справочник Пользователя для National Instruments pci-6110e-6111e
Glossary
G-10
©
National Instruments Corporation
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
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.
junction produces a small voltage as a function of the temperature.
TRIG
trigger signal
t
sc
source clock period
t
sp
source pulse width
TTL
transistor-transistor logic
U
UI
update interval
UISOURCE
update interval counter clock signal
unipolar
a signal range that is always positive (for example, 0 to +10 V)
UPDATE
update signal
V
V
volts
VDC
volts direct current
VI
virtual instrument—(1) a combination of hardware and/or software
elements, typically used with a PC, that has the functionality of a
classic stand-alone instrument (2) a LabVIEW software module
(VI), which consists of a front panel user interface and a block
diagram program
elements, typically used with a PC, that has the functionality of a
classic stand-alone instrument (2) a LabVIEW software module
(VI), which consists of a front panel user interface and a block
diagram program
V
IH
volts, input high
V
IL
volts, input low
V
in
volts in
V
m
measured voltage
PCI_E.book Page 10 Thursday, June 25, 1998 12:55 PM