![background image](http://html1.mh-extra.com/html/national-instruments/pxi-1407/pxi-1407_user-manual_3596805040.webp)
Glossary
G-6
www.ni.com
H
h
Hour.
hardware
The physical components of a computer system, such as the circuit boards,
plug-in boards, chassis, enclosures, peripherals, cables, and so on.
HSYNC
Horizontal synchronization signal. The synchronization pulse signal
produced at the beginning of each video scan line that keeps a video
monitor’s horizontal scan rate in step with the transmission of each
new line.
Hz
Hertz. Frequency in units of 1/second.
I
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.
IC
Integrated circuit.
IEEE
Institute of Electrical and Electronics Engineers.
in.
Inches.
INL
Integral nonlinearity. A measure in LSB of the worst-case deviation from
the ideal A/D or D/A transfer characteristic of the analog I/O circuitry.
instrument driver
A set of high-level software functions, such as NI-IMAQ, that control
specific plug-in computer boards. Instrument drivers are available in
several forms, ranging from a function callable from a programming
language to a virtual instrument (VI) in LabVIEW.
interlaced
A video frame composed of two interleaved fields. The number of lines in
a field are half the number of lines in an interlaced frame.
interpreter
A software utility that executes source code from a high-level language
such as Basic, C or Pascal, by reading one line at a time and executing the
specified operation. See also compiler.