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National Instruments Corporation
G-11
Glossary
INTEN
global interrupt enable bit
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
INTR
interrupt request signal
INTRA
interrupt request status bit for Port A
INTRB
interrupt request status bit for Port B
I/O
input/output
I
OH
current, output high
I
OL
current, output low
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
isothermal
constructed to maintain constant temperature across area. Isothermal
construction of terminal blocks increases thermocouple measurement
accuracy.
