Measurement Computing USB-2404-UI - 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
Hazardous voltages ............................................................................................................................................. 5
Hazardous locations ............................................................................................................................................ 5
Chapter 1
Introducing the USB-2404-UI ............................................................................................................... 6
Overview: USB-2404-UI features ...................................................................................................................... 6
Functional block diagram ................................................................................................................................... 7
Chapter 2
Installing the USB-2404-UI ................................................................................................................... 8
What comes with your USB-2404-UI shipment? ............................................................................................... 8
Hardware .......................................................................................................................................................................... 8
Documentation .................................................................................................................................................................. 8
Unpacking........................................................................................................................................................... 8
Installing the software ........................................................................................................................................ 8
Installing the hardware ....................................................................................................................................... 8
Calibrating the USB-2404-UI ............................................................................................................................. 9
Chapter 3
Functional Details ............................................................................................................................... 10
Components ...................................................................................................................................................... 10
Spring terminal connectors ..............................................................................................................................................10
Strain relief slot ................................................................................................................................................................11
USB connector .................................................................................................................................................................11
LED .................................................................................................................................................................................11
Connecting wires to the spring terminals ......................................................................................................... 11
TEDS sensor connections ................................................................................................................................................12
Signal source connections ................................................................................................................................................12
Timing options .................................................................................................................................................. 12
USB-2404-UI circuitry ..................................................................................................................................... 13
Analog input circuitry ......................................................................................................................................................13
Voltage and current modes ..............................................................................................................................................13
4-wire resistance and 4-wire RTD modes ........................................................................................................................13
3-wire RTD mode ............................................................................................................................................................14
2-wire resistance and quarter-bridge modes .....................................................................................................................14
Half-bridge and full-bridge modes ...................................................................................................................................14
Thermocouple mode ........................................................................................................................................................15
Excitation protection ........................................................................................................................................................15
Chapter 4
Specifications ...................................................................................................................................... 16
Analog input ..................................................................................................................................................... 16
Input mode ranges ............................................................................................................................................................16
Accuracy ..........................................................................................................................................................................17
Stability ............................................................................................................................................................................17
Input noise .......................................................................................................................................................................18
Excitation level ................................................................................................................................................................18
Power ................................................................................................................................................................ 18
Bus interface ..................................................................................................................................................... 19