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Glossary
DAQ-STC
dB
DC
DGND
DI
DIFF
DIO
DIP
dithering
DMA
DNL
DO
E
EEPROM
ENOB
NI 6115/6120 User Manual
data acquisition system timing controller—an application-specific
integrated circuit (ASIC) for the system timing requirements of a general
A/D and D/A system, such as a system containing the National
Instruments E Series devices
decibel—the unit for expressing a logarithmic measure of the ratio of
two signal levels: dB = 20log10 V1/V2, for signals in volts
direct current
digital ground signal
digital input
differential mode—an analog input mode consisting of two terminals,
both of which are isolated from computer ground, whose difference is
measured
digital input/output
dual inline package
the addition of Gaussian noise to an analog input signal for the purpose
of increasing the resolution of a measurement when using averaging
direct memory access—a method by which data can be transferred
to/from computer memory from/to a device or memory on the bus while
the processor does something else; the fastest method of transferring data
to/from computer memory
differential nonlinearity—a measure in least significant bit of the
worst-case deviation of code widths from their ideal value of 1 LSB
digital output
electrically erasable programmable read-only memory—ROM that can
be erased with an electrical signal and reprogrammed
effective number of bits
G-4
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