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Glossary
© National Instruments Corporation
G-9
Getting Started with Your PCI/PXI-6810 SDA
input impedance
the measured resistance and capacitance between the input terminals of
a circuit
input offset current
the difference in the input bias currents of the two inputs of an
instrumentation amplifier
instrument driver
a set of high-level software functions that controls a specific plug-in,
DAQ, PXI, GPIB, VXI, or RS-232 programmable instrument.
Instrument drivers are available in several forms, ranging from a
function callable language to a virtual instrument (VI) in LabVIEW.
instrumentation
a circuit whose output voltage with respect to ground is proportional to
amplifier
the difference between the voltages at its two inputs
interrupt
a computer signal indicating that the CPU should suspend its current
task to service a designated activity
interrupt level
the relative priority at which a device can interrupt
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
IRQ
interrupt request
K
k
kilo—the standard metric prefix for 1,000, or 10
3
, used with units of
measure such as volts, hertz, and meters
K
kilo—the prefix for 1,024, or 2
10
, used with B in quantifying data or
computer memory
L
latched digital I/O
a type of digital acquisition/generation where a device or module
accepts or transfers data after a digital pulse has been received. Also
called handshaked digital I/O.
LED
light-emitting diode