National Instruments 321906B-01 用户手册

Glossary

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 National Instruments Corporation

G-5

scanner advanced 
trigger

the trigger generated by the switch card when scanning. The trigger occurs 
after the switch card has closed a switch and the switch has settled.

sensor

a device that responds to a physical stimulus (heat, light, sound, 
pressure, motion, flow, and so on), and produces a corresponding 
electrical signal

settling time

the amount of time required for a voltage to reach its final value within 
specified limits

soft front panel

a graphical program included with NI-SWITCH that you can use to 
interactively control the switch

TBX

Terminal Block Extension

terminal block

an accessory containing wire connection points, typically screw terminals

thermistor

a semiconductor sensor that exhibits a repeatable change in electrical 
resistance as a function of temperature. Most thermistors exhibit a 
negative temperature coefficient.

thermocouple

a temperature sensor created by joining two dissimilar metals. The 
junction produces a small voltage as a function of the temperature.

trigger

any event that causes or starts some form of data capture

TTL

Transistor-Transistor Logic

V

volts

VDC

volts, direct current

VI

virtual instrument—(1) a combination of hardware and/or software 
elements, typically used with a PC, that has the functionality of a classic 
stand-alone instrument (2) a LabVIEW software module (VI), which 
consists of a front panel user interface and a block diagram program