National Instruments NI 4050 Manual De Usuario
Glossary
© National Instruments Corporation
G-5
H
harmonics
multiples of the fundamental frequency of a signal
half-power bandwidth
the frequency range over which a circuit maintains a level of at least –3 dB
with respect to the maximum level
with respect to the maximum level
hardware
the physical components of a computer system, such as the circuit boards,
plug-in boards, chassis, enclosures, peripherals, cables, and so on
plug-in boards, chassis, enclosures, peripherals, cables, and so on
Hz
hertz—per second, as in cycles per second or samples per second
I
I
ex
excitation current
IEC
International Electrotechnical Commission
IEEE
Institute of Electrical and Electronics Engineers
in.
inches
inductance
the relationship of induced voltage to current
input bias current
the current that flows into the inputs of a circuit
input impedance
the measured resistance and capacitance between the input terminals of a
circuit
circuit
Installation Category
(Overvoltage Category)
(Overvoltage Category)
classification system for expected transients on electrical supply
installations
installations
instrument driver
a set of high-level software functions that controls 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.
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
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
communications channels, operator interface devices, and/or data
acquisition and control interfaces