National Instruments Network Device DAQ S - Manual (Page 161)

Glossary
NI 6124/6154 User Manual G-8 ni.com
pd Pull-down.
PFI Programmable function interface.
PGIA Programmable gain instrumentation amplifier.
physical channel See channel .
port 1. A communications connection on a computer or a remote controller.
2. A digital port consisting of four or eight lines of digital input and/or
output.
ppm Parts per million.
pu Pull-up.
PXI Express PCI Express eXtensions for Instrumentation—The PXI implementation
of PCI Express, a scalable full-simplex serial bus standard that operates at
2.5 Gbps and offers both asynchronous and isochronous data transfers.
Q
quantization The process of converting an analog signal to a digital representation.
Normally performed by an analog-to-digital converter (A/D converter or
ADC).
R
range The maximum and minimum parameters between which a sensor,
instrument, or device operates with a specified set of characteristics.
referenced signal
sources Signal sources with voltage signals that are referenced to a system ground
such as the earth or a building ground. Also called ground signal sources.
rise time The time for a signal to transition from 10% to 90% of the maximum signal
amplitude.
rms Root mean square.
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.