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Glossary
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National Instruments Corporation
G-3
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.
DMM
See digital multimeter.
drivers/driver software
software that controls a specific hardware device such as a switch card
E
external trigger
a voltage pulse from an external source that triggers an event such as
A/D conversion
F
flyback voltage
the voltage spike generated the instant current stops flowing through an
inductor
H
handshaking
the use of two trigger lines between two instruments, such as a switch and
a DMM, to synchronize their actions
Hz
hertz—the number of scans read or updates written per second
I
in.
inches
Interchangeable Virtual
Instrument
an advanced architecture for instrument drivers that includes features such
as simulation and state caching
I/O
input/output—the transfer of data to/from a computer system involving
communications channels, operator interface devices, and/or data
acquisition and control interfaces
ISA
Industry Standard Architecture
IVI
See Interchangeable Virtual Instrument.