Measurement Computing USB-231 - 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-231 ...................................................................................................................... 6
Device features ................................................................................................................................................... 6
Functional block diagram ................................................................................................................................... 7
Chapter 2
Installing the USB-231 .......................................................................................................................... 8
What comes with your shipment? ....................................................................................................................... 8
Hardware .......................................................................................................................................................................... 8
Software ............................................................................................................................................................................ 8
Documentation .................................................................................................................................................................. 8
Unpacking........................................................................................................................................................... 8
Installing the software ........................................................................................................................................ 8
Installing the hardware ....................................................................................................................................... 8
Calibrating the hardware..................................................................................................................................... 9
Chapter 3
Functional Details ............................................................................................................................... 10
Analog input acquisition modes ....................................................................................................................... 10
Software paced mode .......................................................................................................................................................10
Hardware paced mode......................................................................................................................................................10
External components ........................................................................................................................................ 11
Screw terminals................................................................................................................................................................11
USB connector .................................................................................................................................................................13
LED indicator ..................................................................................................................................................................13
Signal connections ............................................................................................................................................ 14
Analog input ....................................................................................................................................................................14
Analog output ..................................................................................................................................................................16
Digital I/O ........................................................................................................................................................................18
Trigger input ....................................................................................................................................................................19
Counter input ...................................................................................................................................................................19
+VO power source ...........................................................................................................................................................19
Ground .............................................................................................................................................................................20
Mechanical drawings ........................................................................................................................................ 21
Chapter 4
Specifications ...................................................................................................................................... 22
Analog input ..................................................................................................................................................... 22
Absolute accuracy (analog input DC voltage measurement accuracy) ............................................................................22
Analog output ................................................................................................................................................... 23
Timebase........................................................................................................................................................... 23
Digital input/output........................................................................................................................................... 23
Digital input .....................................................................................................................................................................24
Digital output ...................................................................................................................................................................24
External digital trigger ...................................................................................................................................... 24
Counter ............................................................................................................................................................. 24
Memory ............................................................................................................................................................ 25