National Instruments Data Acquisition Device NI USB-621x User Manual page 169

mux
N
NI-DAQmx
NI-PGIA
non-referenced signal
sources
NRSE
O
offset
P
period
© National Instruments Corporation
Multiplexer—A set of semiconductor or electromechanical switches
arranged to select one of many inputs to a single output. The majority of
DAQ cards have a multiplexer on the input, which permits the selection of
one of many channels at a time.
A switching device with multiple inputs that sequentially connects each of
its inputs to its output, typically at high speeds, in order to measure several
signals with a single analog input channel.
The latest NI-DAQ driver with new VIs, functions, and development tools
for controlling measurement devices. The advantages of NI-DAQmx over
earlier versions of NI-DAQ include the DAQ Assistant for configuring
channels and measurement tasks for your device for use in LabVIEW,
LabWindows/CVI, and Measurement Studio; increased performance such
as faster single-point analog I/O; and a simpler API for creating DAQ
applications using fewer functions and VIs than earlier versions of
NI-DAQ.
See instrumentation amplifier.
Signal sources with voltage signals that are not connected to an absolute
reference or system ground. Also called floating signal sources. Some
common example of non-referenced signal sources are batteries,
transformers, or thermocouples.
Non-Referenced Single-Ended mode—All measurements are made with
respect to a common (NRSE) measurement system reference, but the
voltage at this reference can vary with respect to the measurement system
ground.
The unwanted DC voltage due to amplifier offset voltages added to a signal.
The period of a signal, most often measured from one zero crossing to the
next zero crossing of the same slope. The period of a signal is the reciprocal
of its frequency (in Hz). Period is designated by the symbol T.
G-11
Glossary
NI USB-621x User Manual