Measurement Computing USB-TEMP-AI - Manual (Page 3)

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Table of Contents
Preface
About this User’s Guide ....................................................................................................................... 5
What you will learn from this user's guide ......................................................................................................... 5
Conventions in this user's guide ......................................................................................................................... 5
Where to find more information ......................................................................................................................... 5
Chapter 1
Introducing the USB-TEMP-AI ............................................................................................................. 6
Functional block diagram ................................................................................................................................... 7
Connecting a USB-TEMP-AI to your computer is easy ..................................................................................... 7
Chapter 2
Installing the USB-TEMP-AI ................................................................................................................. 8
What comes with your shipment? ....................................................................................................................... 8
Hardware .......................................................................................................................................................................... 8
Documentation .................................................................................................................................................................. 8
Unpacking........................................................................................................................................................... 8
Installing the software ........................................................................................................................................ 8
Installing the hardware ....................................................................................................................................... 8
Configuring the hardware ................................................................................................................................... 9
Calibrating the USB-TEMP-AI .......................................................................................................................... 9
Chapter 3
Signal I/O Connections ....................................................................................................................... 10
Screw terminal pinout ....................................................................................................................................... 10
Voltage input terminals (±V0H/V0L to ±V3H/V3L) .......................................................................................................10
Sensor input terminals (T0H/T0L to T3H/T3L) ...............................................................................................................11
Current excitation output terminals (±I1 and ±I2) ...........................................................................................................11
Four-wire, two sensor common terminals (4W01 and 4W23) .........................................................................................11
Sensor common terminals (IT01 and IT23) .....................................................................................................................11
Digital terminals (DIO0 to DIO7) ....................................................................................................................................11
Counter terminal (CTR) ...................................................................................................................................................11
Ground terminals (GND) .................................................................................................................................................11
Power output (+5V) .........................................................................................................................................................12
CJC sensor .......................................................................................................................................................................12
Thermocouple connections ............................................................................................................................... 12
Wiring configuration ........................................................................................................................................................12
RTD and thermistor connections ...................................................................................................................... 13
Two-wire configuration ...................................................................................................................................................13
Three-wire configuration .................................................................................................................................................14
Four-wire configuration ...................................................................................................................................................14
Semiconductor sensor measurements ............................................................................................................... 15
Wiring configuration ........................................................................................................................................................16
Digital I/O connections ..................................................................................................................................... 16
Configuring the DIO channels to generate alarms ...........................................................................................................16
Chapter 4
Functional Details ............................................................................................................................... 17
Thermocouple measurements ........................................................................................................................... 17
Cold junction compensation (CJC) ..................................................................................................................................17
Data linearization .............................................................................................................................................................17
Open-thermocouple detection (OTD) ..............................................................................................................................17
RTD and thermistor measurements .................................................................................................................. 17
Data linearization .............................................................................................................................................................18