Glossary
© National Instruments Corporation G-9 NI USB-621x User Manual
instrumentation
amplifier
A circuit whose output voltage with respect to ground is proportional to the
difference between the voltages at its two inputs. An instrumentation
amplifier normally has high-impedance differential inputs and high
common-mode rejection.
interchannel delay Amount of time that passes between sampling consecutive channels in an
AI scan list. The interchannel delay must be short enough to allow sampling
of all the channels in the channel list, within the sample interval. The
greater the interchannel delay, the more time the PGIA is allowed to settle
before the next channel is sampled. The interchannel delay is regulated by
AI Convert Clock.
interface Connection between one or more of the following: hardware, software, and
the user. For example, hardware interfaces connect two other pieces of
hardware.
interrupt, interrupt
request line
1. A means for a device to notify another device that an event occurred.
2. A computer signal indicating that the CPU should suspend its current
task to service a designated activity.
I
OH
Current, output high.
I
OL
Current, output low.
IRQ See interrupt, interrupt request line.
L
LabVIEW A graphical programming language.
LED Light-Emitting Diode—A semiconductor light source.
lowpass filter A filter that passes signals below a cutoff frequency while blocking signals
above that frequency.
LSB Least Significant Bit.
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