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Glossary
PCI-6023E/6024E/6025E User Manual G-8
©
National Instruments Corporation
input bias current the current that flows into the inputs of a circuit
input impedance the 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 GPIB, VXI,
or RS-232 programmable instrument or a specific plug-in DAQ board.
Instrument drivers are available in several forms, ranging from a function
callable language to a virtual instrument (VI) in LabVIEW.
instrumentation
amplifier
a circuit whose output voltage with respect to ground is proportional to the
difference between the voltages at its two high impedance 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
interval scanning scanning method where there is a longer interval between scans than there
is between individual channels comprising a scan
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
I
OH
current, output high
I
OL
current, output low
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
kS 1,000 samples
PCI.book Page 8 Wednesday, September 16, 1998 9:09 AM