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Glossary
NI 6115/6120 User Manual G-4 ni.com
DAQ-STC 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
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
DGND digital ground signal
DI digital input
DIFF differential mode—an analog input mode consisting of two terminals,
both of which are isolated from computer ground, whose difference is
measured
DIO digital input/output
DIP dual inline package
dithering the addition of Gaussian noise to an analog input signal for the purpose
of increasing the resolution of a measurement when using averaging
DMA 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
DNL differential nonlinearity—a measure in least significant bit of the
worst-case deviation of code widths from their ideal value of 1 LSB
DO digital output
E
EEPROM electrically erasable programmable read-only memory—ROM that can
be erased with an electrical signal and reprogrammed
ENOB effective number of bits