Glossary
DAQMeter DAQCard-4050 User Manual
G-6
©
National Instruments Corporation
input impedance
the measured resistance and capacitance between the input terminals of
a circuit
Installation Category
classification system for expected transients on electrical supply
(Overvoltage Category) installations
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.
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
ISA
industry standard architecture
isolation
a type of signal conditioning in which you isolate the transducer signals
from the computer for safety purposes. This protects you and your
computer from large voltage spikes and makes sure the measurements
from the DAQ device are not affected by differences in ground
potentials.
isolation voltage
the voltage that an isolated circuit can normally withstand, usually
specified from input to input and/or from any input to the amplifier
output, or to the computer bus
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
