Glossary
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National Instruments Corporation
G-5
differential input
an analog input consisting of two terminals, both of which are isolated from
computer ground, whose difference is measured
digital port
See port.
DIO
digital input/output
dithering
the addition of Gaussian noise to an analog input signal
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. DMA is 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
driver
software that controls a specific hardware device such as a DAQ device or
a GPIB interface board
E
EEPROM
electrically erasable programmable read-only memory—ROM that can be
erased with an electrical signal and reprogrammed
electrostatically coupled
propagating a signal by means of a varying electric field
external trigger
a voltage pulse from an external source that triggers an event such as A/D
conversion
EXTSTROBE
external strobe signal
