Glossary
©
National Instruments Corporation
G-11
m
u
x
M
u
ltiplexer—A set of semicond
u
ctor or electromechanical switches
arranged to select one of many inp
u
ts to a single o
u
tp
u
t. The majority of
DAQ cards have a m
u
ltiplexer on the inp
u
t, which permits the selection of
one of many channels at a time.
A switching device with m
u
ltiple inp
u
ts that seq
u
entially connects each of
its inp
u
ts to its o
u
tp
u
t, typically at high speeds, in order to meas
u
re several
signals with a single analog inp
u
t channel.
N
NI-DAQmx
The latest NI-DAQ driver with new VIs, f
u
nctions, and development tools
for controlling meas
u
rement devices. The advantages of NI-DAQmx over
earlier versions of NI-DAQ incl
u
de the DAQ Assistant for config
u
ring
channels and meas
u
rement tasks for yo
u
r device for
u
se in LabVIEW,
LabWindows/CVI, and Meas
u
rement St
u
dio; increased performance s
u
ch
as faster single-point analog I/O; and a simpler API for creating DAQ
applications
u
sing fewer f
u
nctions and VIs than earlier versions of
NI-DAQ.
NI-PGIA
See
.
non-referenced signal
so
u
rces
Signal so
u
rces with voltage signals that are not connected to an absol
u
te
reference or system gro
u
nd. Also called floating signal so
u
rces. Some
common example of non-referenced signal so
u
rces are batteries,
transformers, or thermoco
u
ples.
NRSE
Non-Referenced Single-Ended mode—All meas
u
rements are made with
respect to a common (NRSE) meas
u
rement system reference, b
u
t the
voltage at this reference can vary with respect to the meas
u
rement system
gro
u
nd.
O
offset
The
u
nwanted DC voltage d
u
e to amplifier offset voltages added to a signal.
P
period
The period of a signal, most often meas
u
red from one zero crossing to the
next zero crossing of the same slope. The period of a signal is the reciprocal
of its freq
u
ency (in Hz). Period is designated by the symbol T.
