National Instruments NI 5911, Руководство пользователя, Страница: 36 / 45

Glossary
© National Instruments Corporation G-3 NI 5911 User Manual
clock hardware component that controls timing for reading from or writing to
groups
CMRR common-mode rejection ratio—a measure of an instrument’s ability to
reject interference from a common-mode signal, usually expressed in
decibels (dB)
counter/timer
a circuit that counts external pulses or clock pulses (timing)
coupling the manner in which a signal is connected from one location to another
D
dB decibel—the unit for expressing a logarithmic measure of the ratio of
two signal levels: dB=20log10 V1/V2, for signals in volts
DC direct current
default setting a default parameter value recorded in the driver. In many cases, the default
input of a control is a certain value (often 0) that means
use the current
default setting .
device a plug-in data acquisition board, card, or pad. The NI 5911 is an example
of a device.
differential input an analog input consisting of two terminals, both of which are isolated from
computer ground, whose difference is measured
double insulated a device that contains the necessary insulating structures to provide electric
shock protection without the requirement of a safety ground connection
drivers software that controls a specific hardware instrument
E
EEPROM electrically erasable programmable read-only memory—ROM that can be
erased with an electrical signal and reprogrammed
equivalent time
sampling any method used to sample signals in such a way that the apparent sampling
rate is higher than the real sampling rate
event
the condition or state of an analog or digital signal