Measurement Computing USB-2408 Series - 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-2408 Series ........................................................................................................ 6
Overview: USB-2408 Series features ................................................................................................................. 6
USB-2408 Series block diagram ........................................................................................................................ 7
Chapter 2
Installing a USB-2408 Series Device ................................................................................................... 8
What comes with your shipment? ....................................................................................................................... 8
Hardware .......................................................................................................................................................................... 8
Documentation .................................................................................................................................................................. 8
Unpacking........................................................................................................................................................... 8
Installing the software ........................................................................................................................................ 8
Installing the hardware ....................................................................................................................................... 8
Calibrating .......................................................................................................................................................... 9
Factory calibration ............................................................................................................................................................ 9
Field calibration ................................................................................................................................................................ 9
Chapter 3
Functional Details ............................................................................................................................... 10
External components ........................................................................................................................................ 10
USB connector .................................................................................................................................................................10
LEDs ................................................................................................................................................................................10
Screw terminals................................................................................................................................................................10
Signal connections ............................................................................................................................................ 12
Input isolation ..................................................................................................................................................................12
Analog/TC input ..............................................................................................................................................................12
Analog input mode ...........................................................................................................................................................13
Gain queue .......................................................................................................................................................................13
TC input mode .................................................................................................................................................................14
Analog output (USB-2408-2AO only) .............................................................................................................................16
Digital I/O ........................................................................................................................................................................16
Internal pull-up/pull-down capability...............................................................................................................................17
External pull-up/pull-down capability .............................................................................................................................19
Counter input ...................................................................................................................................................................19
Ground .............................................................................................................................................................................19
Mechanical drawings ........................................................................................................................................ 20
Chapter 4
Specifications ...................................................................................................................................... 21
Analog input ..................................................................................................................................................... 21
Channel configurations ..................................................................................................................................... 22
Compatible sensors ..........................................................................................................................................................22
Accuracy ........................................................................................................................................................... 22
Thermocouple measurement accuracy .............................................................................................................................22
Analog input DC voltage measurement accuracy ............................................................................................................23
Input bandwidth ...............................................................................................................................................................24
Noise performance ...........................................................................................................................................................24
Channel switching error ...................................................................................................................................................25
Throughput rate ................................................................................................................................................ 25