Glossary
©NationalInstruments Corporation G-3 NI5911 User Manual
clock hardware component that controls timing for reading from or writing to
groups
CMRR common-moderejection ratio—ameasure of an instrument’sability to
rejectinterference 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 directcurrent
defaultsetting adefault parameter value recorded in the driver. In many cases, the default
inputof a control isa certain value(often 0) that means use the current
default setting.
device aplug-in data acquisition board, card, or pad. The NI 5911 is an example
ofa device.
differentialinput ananalog input consisting of two terminals, both of which are isolated from
computerground, whose difference is measured
double insulated adevice that contains the necessary insulating structures to provide electric
shock protection without the requirement of a safety ground connection
drivers softwarethat controls a specific hardware instrument
E
EEPROM electricallyerasable programmable read-only memory—ROM that can be
erased with an electricalsignal and reprogrammed
equivalenttime
sampling
anymethod 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