用户手册目录SCB-68 68-Pin Shielded Connector Block User Manual1Support2Worldwide Technical Support and Product Information2National Instruments Corporate Headquarters2Worldwide Offices2Important Information3Warranty3Copyright3Trademarks3Patents3WARNING REGARDING USE OF NATIONAL INSTRUMENTS PRODUCTS3Compliance4Contents6About This Manual9Conventions9NI Documentation10Chapter 1 Introduction11What You Need to Get Started11Quick Reference Label12Table 1-1. Device-Specific Hardware Configuration12Figure 1-1. SCB-68 Parts Locator Diagram15Installing Cables15Using 68-Pin Cables15Figure 1-2. Connecting a 68-Pin DAQ Device to an SCB-6816Using 100-Pin Cables16Figure 1-3. Connecting a 100-Pin DAQ Device to Two SCB-68 Connector Blocks17Figure 1-4. SCB-68 E Series I/O Connector Pinout (Full)18Figure 1-5. SCB-68 E Series I/O Connector Pinout (Extended AI)19Figure 1-6. SCB-68 E Series I/O Connector Pinout (Extended Digital)20Configuring the SCB-6821Safety Information21Chapter 2 Parts Locator and Wiring Guide24Figure 2-1. SCB-68 Printed Circuit Diagram25Switch Configuration26Table 2-1. Switch Configurations and Affected Signals27Chapter 3 Connecting Signals29Connecting Analog Input Signals29Input Modes29Figure 3-1. Summary of AI Connections30Nonreferenced or Floating Signal Sources31Differential Inputs31Single-Ended Inputs31Ground-Referenced Signal Sources32Differential Inputs32Single-Ended Inputs32Differential Connection Considerations (DIFF Input Mode)33Differential Connections for Ground-Referenced Signal Sources34Figure 3-2. Differential Input Connections for Ground-Referenced Signals34Differential Connections for Nonreferenced or Floating Signal Sources35Figure 3-3. Differential Input Connections for Nonreferenced Signals35Single-Ended Connection Considerations36Single-Ended Connections for Floating Signal Sources (RSE Input Mode)37Figure 3-4. Single-Ended Input Connections for Nonreferenced or Floating Signals37Single-Ended Connections for Grounded Signal Sources (NRSE Input Mode)37Figure 3-5. Single-Ended Input Connections for Ground-Referenced Signals38Connecting Analog Output Signals38Figure 3-6. Connecting AO Signals39Connecting Digital Signals39Figure 3-7. Digital I/O Connections40Connecting Timing Signals40Figure 3-8. Timing I/O Connections41Noise Considerations41Chapter 4 Using Thermocouples43Table 4-1. Thermocouple Coloring43Switch Settings and Temperature Sensor Configuration44Figure 4-1. Single-Ended Switch Configuration45Figure 4-2. Differential Switch Configuration45Special Considerations45Chapter 5 Adding Components for Special Functions46Channel Pad Configurations47Conditioning Analog Input Channels47Figure 5-1. Analog Input Channel Configuration Diagram for ACH<i> and ACH<i+8>47Table 5-1. Component Location for Analog Input Channels in DIFF Input Mode47Conditioning Analog Output Channels48Figure 5-2. Analog Output Channel Configuration Diagram48Table 5-2. Component Location for Analog Output Channels in DIFF Input Mode48Figure 5-3. Analog Output Channel Configuration Diagram for DAC0OUT49Conditioning PFI0/TRIG149Figure 5-4. Digital Input Channel Configuration Diagram49Figure 5-5. Digital Input Channel Configuration Diagram for PFI0/TRIG149Accuracy and Resolution Considerations50Open Thermocouple Detection50Differential Open Thermocouple Detection51Single-Ended Open Thermocouple Detection51Sources of Error51Lowpass Filtering52Theory of Operation52Figure 5-6. Transfer Function Attenuation for an Ideal Filter53Figure 5-7. Transfer Function Attenuation for a Real Filter53Figure 5-8. Square Wave Input Signal54Figure 5-9. Response of an Ideal Filter to a Square Wave Input Signal54Figure 5-10. Response of a Real Filter to a Square Wave Input Signal55One-Pole Lowpass RC Filter55Figure 5-11. Transfer Function of a Simple Series Circuit55Selecting Components56Adding Components56Single-Ended Lowpass Filter57Figure 5-12. SCB-68 Circuit Diagram for a Single-Ended Lowpass Filter57Differential Lowpass Filter57Figure 5-13. SCB-68 Circuit Diagram for a Differential Lowpass Filter57Analog Output and Digital Input Lowpass Filtering57Lowpass Filtering Applications58Noise Filtering58Antialiasing Filtering58Figure 5-14. Aliasing of a High-Frequency Signal58Special Consideration for Analog Input Channels59Special Consideration for Analog Output Signals59Figure 5-15. Lowpass Filtering of AO Signals60Special Consideration for Digital Trigger Input Signals60Figure 5-16. Digital Trigger Input Signal with a High-Frequency Component60Figure 5-17. Lowpass Filtering of Digital Trigger Input Signals61Measuring a 4 to 20mA Current61Theory of Operation61Figure 5-18. Current-to-Voltage Electrical Circuit62Selecting a Resistor62Adding Components63Single-Ended Inputs63Differential Inputs63Attenuating Voltage63Figure 5-19. Attenuating Voltage with a Voltage Divider64Theory of Operation64Selecting Components65Accuracy Considerations65Adding Components65Single-Ended Input Attenuators65Figure 5-20. SCB-68 Circuit Diagram for SE Input Attenuation66Differential Input Attenuators66Figure 5-21. SCB-68 Circuit Diagram for DIFF Input Attenuation66Analog Output and Digital Input Attenuators67Figure 5-22. SCB-68 Circuit Diagram for Digital Input Attenuation67Special Considerations for Analog Input67Figure 5-23. Input Impedance Electrical Circuit68Special Considerations for Analog Output68Figure 5-24. Electrical Circuit for Determining Output Impedance68Special Considerations for Digital Inputs69Appendix A Specifications70Appendix B Quick Reference Labels73Figure B-1. E Series Devices74Figure B-2. NI 670X Devices75Figure B-3. NI 671X/673X Devices76Figure B-4. S Series Devices77Figure B-5. NI 660X Devices78Figure B-6. NI 653X Devices79Figure B-7. NI 7811R/7831R Devices80Appendix C Fuse and Power81Appendix D SCB-68 Circuit Diagrams82Figure D-1. +5 V Power Supply82Figure D-2. Cold-Junction Compensation Circuitry83Figure D-3. Digital Trigger Circuitry83Figure D-4. Analog Output Circuitry84Appendix E Soldering and Desoldering on the SCB-6885Figure E-1. SCB-68 Parts Locator Diagram85Appendix F Technical Support and Professional Services87Glossary89Numbers/Symbols89A-C90D91E-H92I-N93O-P94R-S95T-W96Index97Numbers97A97B-C98D-G100I-N101O-S102T-V103文件大小: 903.4 KB页数: 104Language: English打开用户手册
用户手册目录SCB-68 68-Pin Shielded Connector Block User Manual1Support2Worldwide Technical Support and Product Information2National Instruments Corporate Headquarters2Worldwide Offices2Important Information3Warranty3Copyright3Trademarks3Patents3WARNING REGARDING USE OF NATIONAL INSTRUMENTS PRODUCTS3Compliance4Contents6About This Manual9Conventions9NI Documentation10Chapter 1 Introduction11What You Need to Get Started11Quick Reference Label12Table 1-1. Device-Specific Hardware Configuration12Figure 1-1. SCB-68 Parts Locator Diagram15Installing Cables15Using 68-Pin Cables15Figure 1-2. Connecting a 68-Pin DAQ Device to an SCB-6816Using 100-Pin Cables16Figure 1-3. Connecting a 100-Pin DAQ Device to Two SCB-68 Connector Blocks17Figure 1-4. SCB-68 E Series I/O Connector Pinout (Full)18Figure 1-5. SCB-68 E Series I/O Connector Pinout (Extended AI)19Figure 1-6. SCB-68 E Series I/O Connector Pinout (Extended Digital)20Configuring the SCB-6821Safety Information21Chapter 2 Parts Locator and Wiring Guide24Figure 2-1. SCB-68 Printed Circuit Diagram25Switch Configuration26Table 2-1. Switch Configurations and Affected Signals27Chapter 3 Connecting Signals29Connecting Analog Input Signals29Input Modes29Figure 3-1. Summary of AI Connections30Nonreferenced or Floating Signal Sources31Differential Inputs31Single-Ended Inputs31Ground-Referenced Signal Sources32Differential Inputs32Single-Ended Inputs32Differential Connection Considerations (DIFF Input Mode)33Differential Connections for Ground-Referenced Signal Sources34Figure 3-2. Differential Input Connections for Ground-Referenced Signals34Differential Connections for Nonreferenced or Floating Signal Sources35Figure 3-3. Differential Input Connections for Nonreferenced Signals35Single-Ended Connection Considerations36Single-Ended Connections for Floating Signal Sources (RSE Input Mode)37Figure 3-4. Single-Ended Input Connections for Nonreferenced or Floating Signals37Single-Ended Connections for Grounded Signal Sources (NRSE Input Mode)37Figure 3-5. Single-Ended Input Connections for Ground-Referenced Signals38Connecting Analog Output Signals38Figure 3-6. Connecting AO Signals39Connecting Digital Signals39Figure 3-7. Digital I/O Connections40Connecting Timing Signals40Figure 3-8. Timing I/O Connections41Noise Considerations41Chapter 4 Using Thermocouples43Table 4-1. Thermocouple Coloring43Switch Settings and Temperature Sensor Configuration44Figure 4-1. Single-Ended Switch Configuration45Figure 4-2. Differential Switch Configuration45Special Considerations45Chapter 5 Adding Components for Special Functions46Channel Pad Configurations47Conditioning Analog Input Channels47Figure 5-1. Analog Input Channel Configuration Diagram for ACH<i> and ACH<i+8>47Table 5-1. Component Location for Analog Input Channels in DIFF Input Mode47Conditioning Analog Output Channels48Figure 5-2. Analog Output Channel Configuration Diagram48Table 5-2. Component Location for Analog Output Channels in DIFF Input Mode48Figure 5-3. Analog Output Channel Configuration Diagram for DAC0OUT49Conditioning PFI0/TRIG149Figure 5-4. Digital Input Channel Configuration Diagram49Figure 5-5. Digital Input Channel Configuration Diagram for PFI0/TRIG149Accuracy and Resolution Considerations50Open Thermocouple Detection50Differential Open Thermocouple Detection51Single-Ended Open Thermocouple Detection51Sources of Error51Lowpass Filtering52Theory of Operation52Figure 5-6. Transfer Function Attenuation for an Ideal Filter53Figure 5-7. Transfer Function Attenuation for a Real Filter53Figure 5-8. Square Wave Input Signal54Figure 5-9. Response of an Ideal Filter to a Square Wave Input Signal54Figure 5-10. Response of a Real Filter to a Square Wave Input Signal55One-Pole Lowpass RC Filter55Figure 5-11. Transfer Function of a Simple Series Circuit55Selecting Components56Adding Components56Single-Ended Lowpass Filter57Figure 5-12. SCB-68 Circuit Diagram for a Single-Ended Lowpass Filter57Differential Lowpass Filter57Figure 5-13. SCB-68 Circuit Diagram for a Differential Lowpass Filter57Analog Output and Digital Input Lowpass Filtering57Lowpass Filtering Applications58Noise Filtering58Antialiasing Filtering58Figure 5-14. Aliasing of a High-Frequency Signal58Special Consideration for Analog Input Channels59Special Consideration for Analog Output Signals59Figure 5-15. Lowpass Filtering of AO Signals60Special Consideration for Digital Trigger Input Signals60Figure 5-16. Digital Trigger Input Signal with a High-Frequency Component60Figure 5-17. Lowpass Filtering of Digital Trigger Input Signals61Measuring a 4 to 20mA Current61Theory of Operation61Figure 5-18. Current-to-Voltage Electrical Circuit62Selecting a Resistor62Adding Components63Single-Ended Inputs63Differential Inputs63Attenuating Voltage63Figure 5-19. Attenuating Voltage with a Voltage Divider64Theory of Operation64Selecting Components65Accuracy Considerations65Adding Components65Single-Ended Input Attenuators65Figure 5-20. SCB-68 Circuit Diagram for SE Input Attenuation66Differential Input Attenuators66Figure 5-21. SCB-68 Circuit Diagram for DIFF Input Attenuation66Analog Output and Digital Input Attenuators67Figure 5-22. SCB-68 Circuit Diagram for Digital Input Attenuation67Special Considerations for Analog Input67Figure 5-23. Input Impedance Electrical Circuit68Special Considerations for Analog Output68Figure 5-24. Electrical Circuit for Determining Output Impedance68Special Considerations for Digital Inputs69Appendix A Specifications70Appendix B Quick Reference Labels73Figure B-1. E Series Devices74Figure B-2. NI 670X Devices75Figure B-3. NI 671X/673X Devices76Figure B-4. S Series Devices77Figure B-5. NI 660X Devices78Figure B-6. NI 653X Devices79Figure B-7. NI 7811R/7831R Devices80Appendix C Fuse and Power81Appendix D SCB-68 Circuit Diagrams82Figure D-1. +5 V Power Supply82Figure D-2. Cold-Junction Compensation Circuitry83Figure D-3. Digital Trigger Circuitry83Figure D-4. Analog Output Circuitry84Appendix E Soldering and Desoldering on the SCB-6885Figure E-1. SCB-68 Parts Locator Diagram85Appendix F Technical Support and Professional Services87Glossary89Numbers/Symbols89A-C90D91E-H92I-N93O-P94R-S95T-W96Index97Numbers97A97B-C98D-G100I-N101O-S102T-V103文件大小: 903.4 KB页数: 104Language: English打开用户手册