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 OM-USB-TEMP-AI ........................................................................................................... 6
Overview: OM-USB-TEMP-AI features.................................................................................................................. 6
OM-USB-TEMP-AI block diagram ......................................................................................................................... 7
Software features ....................................................................................................................................................... 7
Connecting a OM-USB-TEMP-AI to your computer is easy.................................................................................. 8
Chapter 2
Installing the OM-USB-TEMP-AI ............................................................................................................... 9
What comes with your OM-USB-TEMP-AI shipment?.......................................................................................... 9
Hardware .....................................................................................................................................................................................9
Additional documentation ..........................................................................................................................................................9
Unpacking the OM-USB-TEMP-AI......................................................................................................................... 9
Installing the software ............................................................................................................................................. 10
Installing the OM-USB-TEMP-AI ......................................................................................................................... 10
Configuring the OM-USB-TEMP-AI..................................................................................................................... 10
Calibrating the OM-USB-TEMP-AI ...................................................................................................................... 10
Chapter 3
Signal I/O Connections ............................................................................................................................ 11
Screw terminal pin out ............................................................................................................................................ 11
Voltage input terminals (±V0H/V0L to ±V3H/V3L) .............................................................................................................12
Sensor input terminals (T0H/T0L to T3H/T3L)......................................................................................................................12
Current excitation output terminals (±I1 and ±I2) ..................................................................................................................13
Four-wire, two sensor common terminals (4W01 and 4W23) ...............................................................................................13
Sensor common terminals (IT01 and IT23).............................................................................................................................13
Digital terminals (DIO0 to DIO7)............................................................................................................................................13
Counter terminal (CTR) ...........................................................................................................................................................13
CJC sensor.................................................................................................................................................................................13
Ground terminals (GND)... .......................................................................................................................................................13
Power terminal (+5V)...............................................................................................................................................................14
Thermocouple connections ..................................................................................................................................... 14
Wiring configuration ................................................................................................................................................................14
RTD and thermistor connections ............................................................................................................................ 14
Two-wire configuration............................................................................................................................................................15
Three-wire configuration..........................................................................................................................................................16
Four-wire configuration............................................................................................................................................................16
Semiconductor sensor measurements ..................................................................................................................... 17
Wiring configuration ................................................................................................................................................................18
Digital I/O connections ........................................................................................................................................... 18
Chapter 4
Functional Details ..................................................................................................................................... 19
Thermocouple measurements ................................................................................................................................. 19
Cold junction compensation (CJC) ..........................................................................................................................................19
Data linearization......................................................................................................................................................................19
