Glossary
©
National Instruments
G-9
X Series User Manual
instr
u
ment driver
A set of high-level software f
u
nctions that controls a specific GPIB, VXI,
or RS232 programmable instr
u
ment or a specific pl
u
g-in DAQ device.
Instr
u
ment drivers are available in several forms, ranging from a f
u
nction
callable lang
u
age to a virt
u
al instr
u
ment (VI) in LabVIEW.
instr
u
mentation
amplifier
A circ
u
it whose o
u
tp
u
t voltage with respect to gro
u
nd is proportional to the
difference between the voltages at its two inp
u
ts. An instr
u
mentation
amplifier normally has high-impedance differential inp
u
ts and high
common-mode rejection.
interface
Connection between one or more of the following: hardware, software, and
the
u
ser. For example, hardware interfaces connect two other pieces of
hardware.
I
OH
C
u
rrent, o
u
tp
u
t high.
I
OL
C
u
rrent, o
u
tp
u
t low.
K
kS
1,000 samples.
L
LabVIEW
A graphical programming lang
u
age.
LED
Light-Emitting Diode—A semicond
u
ctor light so
u
rce.
lowpass filter
A filter that passes signals below a c
u
toff freq
u
ency while blocking signals
above that freq
u
ency.
LSB
Least Significant Bit.
M
meas
u
rement
The q
u
antitative determination of a physical characteristic. In practice,
meas
u
rement is the conversion of a physical q
u
antity or observation to a
domain where a h
u
man being or comp
u
ter can determine the val
u
e.
meas
u
rement device
DAQ devices, s
u
ch as the X Series m
u
ltif
u
nction I/O (MIO) devices, SCXI
signal conditioning mod
u
les, and switch mod
u
les.
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