National Instruments 653X Manuale Utente
Glossary
© National Instruments Corporation
G-7
pretrigger
acquiring data that occurs before a trigger
propagation delay
the amount of time required for a signal to pass through a circuit
protocol
the exact sequence of bits, characters and control codes used to transfer data
between computers and peripherals through a communications channel,
such as the GPIB
between computers and peripherals through a communications channel,
such as the GPIB
PXI
PCI eXtensions for Instrumentation—a rugged, open system for modular
instrumentation based on CompactPCI, with special mechanical, electrical,
and software features
instrumentation based on CompactPCI, with special mechanical, electrical,
and software features
R
real time
a property of an event or system in which data is processed as it is acquired
instead of being accumulated and processed at a later time
instead of being accumulated and processed at a later time
REQ
Request—Handshaking signal generated by the peripheral device,
indicating it is ready. In some transfer modes, the 653X device can
internally generate a REQ signal. The REQ signal with a bar above the
name indicates it is an inverted request signal.
indicating it is ready. In some transfer modes, the 653X device can
internally generate a REQ signal. The REQ signal with a bar above the
name indicates it is an inverted request signal.
RGND
reserved ground
RT Series DAQ Device
A collection of one, two, or four ports and an associated timing controller.
All handshaking I/O, pattern I/O and buffered operations must be
performed on groups.
All handshaking I/O, pattern I/O and buffered operations must be
performed on groups.
RTSI bus
Real-Time System Integration Bus—the National Instruments timing bus
that connects DAQ devices directly, by means of connectors on top of the
devices, for precise synchronization of functions
that connects DAQ devices directly, by means of connectors on top of the
devices, for precise synchronization of functions
S
s
seconds
S
samples
S/s
Samples per second—used to express the rate at which a DAQ device
samples an analog signal
samples an analog signal
sample
an instantaneous measurement of a signal, normally using an
analog-to-digital convertor in a DAQ device
analog-to-digital convertor in a DAQ device