National Instruments Computer-Based Instruments Digital Oscilloscope for PCI NI 5911 Manual de usuario descargar pdf (Pagina 50)

Glossary

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

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

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

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National Instruments Computer-Based Instruments Digital Oscilloscope for PCI NI 5911 Manual de usuario Pagina 50