National Instruments NI 6232 User Manual

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Contents

National Instruments NI 6232 User Manual Manual pdf 7 page image

ContentsNI 6232/6233 User Manual viii ni.comChapter 3Connector InformationI/O Connector Signal Descriptions................................................................................ 3-1RTSI Connector Pinout ................................................................................................. 3-3Chapter 4Analog InputAnalog Input Circuitry .................................................................................................. 4-1Analog Input Range....................................................................................................... 4-2Analog Input Ground-Reference Settings ..................................................................... 4-3Configuring AI Ground-Reference Settings in Software ................. 4-5Multichannel Scanning Considerations......................................................................... 4-6Use Low Impedance Sources .......................................................................... 4-6Use Short High-Quality Cabling..................................................................... 4-7Carefully Choose the Channel Scanning Order .............................................. 4-7Avoid Switching from a Large to a Small Input Range ................... 4-7Insert Grounded Channel between Signal Channels ........................ 4-8Minimize Voltage Step between Adjacent Channels ....................... 4-8Avoid Scanning Faster Than Necessary ......................................................... 4-9Example 1 ......................................................................................... 4-9Example 2 ......................................................................................... 4-9Analog Input Data Acquisition Methods....................................................................... 4-9Software-Timed Acquisitions ......................................................................... 4-9Hardware-Timed Acquisitions ........................................................................ 4-10Buffered ............................................................................................ 4-10Non-Buffered.................................................................................... 4-11Analog Input Triggering................................................................................................ 4-11Connecting Analog Voltage Input Signals .................................................................... 4-11Types of Signal Sources ................................................................................................ 4-12Floating Signal Sources .................................................................................. 4-13Ground-Referenced Signal Sources ................................................................ 4-13Differential Connection Considerations.......................................................... 4-13Differential Connections for Ground-Referenced Signal Sources.................. 4-14Differential Input Biasing ................................................................. 4-15Differential Connections for Non-Referenced or Floating Signal Sources .... 4-15Single-Ended Connection Considerations ...................................................... 4-16Single-Ended Connections for Floating orGrounded Signal Sources............................................................... 4-17Field Wiring Considerations.......................................................................................... 4-18Analog Input Timing Signals ........................................................................................ 4-19AI Sample Clock Signal.................................................................................. 4-22Using an Internal Source .................................................................. 4-23