National Instruments NI 6120 用户手册

rise time

the difference in time between the 10% and 90% points of the step 
response of a system

rms

root mean square

RTD

resistive temperature detector—a metallic probe that measures 
temperature based upon its coefficient of resistivity

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

RTSI_OSC

RTSI Oscillator—RTSI bus master clock

s

seconds

S

samples

S/s

samples per second—used to express the rate at which a DAQ device 
samples an analog signal

SCANCLK

scan clock signal

scatter-gather

a term that describes very high-speed DMA burst-mode transfers that are 
made only by the bus master

signal conditioning

the manipulation of signals to prepare them for digitizing

SFDR

spurious free dynamic range

SISOURCE

SI counter clock signal

SOURCE

source signal

STARTSCAN

start scan signal

STC

system timing controller

system noise

a measure of the amount of noise present in an analog circuit or when the 
analog inputs are grounded