National Instruments NI 6239 用户手册

© National Instruments Corporation

ft

Feet.

function

1. A built-in execution element, comparable to an operator, function, or 

statement in a conventional language.

2. A set of software instructions executed by a single line of code that may 

have input and/or output parameters and returns a value when executed.

glitch

An unwanted signal excursion of short duration that is usually unavoidable.

GND

See ground.

ground

1. A pin.

2. An electrically neutral wire that has the same potential as the 

surrounding earth. Normally, a noncurrent-carrying circuit intended for 
safety.

3. A common reference point for an electrical system.

hardware

The physical components of a computer system, such as the circuit boards, 
plug-in devices, chassis, enclosures, peripherals, and cables.

hardware triggering

A form of triggering where you set the start time of an acquisition and 
gather data at a known position in time relative to a trigger signal.

Hz

1. Hertz—The SI unit for measurement of frequency. One hertz (Hz) 

equals one cycle per second.

2. The number of scans read or updates written per second.

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.