National Instruments 1128 用户手册

© National Instruments Corporation

soft front panel

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

software scanning

a method by which channels are selected through the software

synchronous scanning

hardware-timed scanning uses one triggering signal to advance the 
multiplexer to the next channel in the scan

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

VMC

voltmeter complete signal—during synchronous or handshake scanning 
with an external DMM, this signal advances the switching module to the 
next channel. It is called External Trigger In (EXT_TRIG_IN) on the 
SCXI-1331 terminal block.