SCB-68 Connector Block

3 6 differential connections for nonreferenced or

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Unformatted text preview: ntial Connections for Nonreferenced or Floating Signal Sources .............................................................3-7 Using Bias Resistors ...........................................................3-7 National Instruments Corporation vii SCB-68 Shielded Connector Block User Manual Contents Single-Ended Connection Considerations ...................................................... 3-8 Single-Ended Connections for Floating Signal Sources (RSE Input Mode).......................................................................... 3-9 Single-Ended Connections for Grounded Signal Sources (NRSE Input Mode)....................................................................... 3-9 Connecting Analog Output Signals ............................................................................... 3-10 Connecting Digital Signals............................................................................................ 3-11 Connecting Timing Signals ........................................................................................... 3-12 Noise Considerations..................................................................................................... 3-13 Chapter 4 Using Thermocouples Switch Settings and Temperature Sensor Configuration............................................... 4-2 Special Considerations .................................................................................................. 4-3 Chapter 5 Adding Components for Special Functions Channel Pad Configurations.......................................................................................... 5-2 Conditioning Analog Input Channels ............................................................. 5-2 Conditioning Analog Output Channels........................................................... 5-3 Conditioning PFI0/TRIG1 .............................................................................. 5-4 Accuracy and Resolution Considerations...................................................................... 5-5 Open Thermocouple Detection...................................................................................... 5-5 Differential Open Thermocouple Detection ................................................... 5-6 Single-Ended Open Thermocouple Detection ................................................ 5-6 Sources of Error .............................................................................................. 5-6 Lowpass Filtering .......................................................................................................... 5-7 Theory of Operation........................................................................................ 5-7 One-Pole Lowpass RC Filter .......................................................................... 5-10 Selecting Components..................................................................................... 5-11 Adding Components ....................................................................................... 5-11 Single-Ended Lowpass Filter............................................................ 5-12 Differential Lowpass Filter............................................................... 5-12 Analog Output and Digital Input Lowpass Filtering ........................ 5-12 Lowpass Filtering Applications ...................................................................... 5-13 Noise Filtering .................................................................................. 5-13 Antialiasing Filtering ........................................................................ 5-13 Special Consideration for Analog Input Channels.......................................... 5-14 Special Consideration for Analog Output Signals .......................................... 5-14 Special Consideration for Digital Trigger Input Signals ................................ 5-15 Measuring a 4 to 20 mA Current................................................................................... 5-16 Theory of Operation........................................................................................ 5-16 SCB-68 Shielded Connector Block User Manual viii ni.com Contents Selecting a Resistor .........................................................................................5-17 Adding Components........................................................................................5-18 Single-Ended Inputs..........................................................................5-18 Differential Inputs .............................................................................5-18 Attenuating Voltage .......................................................................................................5-18 Theory of Operation ........................................................................................5-19 Selecting Components .....................................................................................5-20 Accuracy Considerations ..............................
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This note was uploaded on 05/19/2012 for the course ELEN 3030 taught by Professor Joshi during the Spring '12 term at Marquette.

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