Document Outline

• SCB-68 68-Pin Shielded Connector Block User Manual
• Support
  • Worldwide Technical Support and Product Information
  • National Instruments Corporate Headquarters
  • Worldwide Offices
• Important Information
  • Warranty
  • Copyright
  • Trademarks
  • Patents
  • WARNING REGARDING USE OF NATIONAL INSTRUMENTS PRODUCTS
• Compliance
• Contents
• About This Manual
  • Conventions
  • NI Documentation
• Chapter 1 Introduction
  • What You Need to Get Started
  • Quick Reference Label
    • Table 1-1. Device-Specific Hardware Configuration
    • Figure 1-1. SCB-68 Parts Locator Diagram
  • Installing Cables
    • Using 68-Pin Cables
      • Figure 1-2. Connecting a 68-Pin DAQ Device to an SCB-68
    • Using 100-Pin Cables
      • Figure 1-3. Connecting a 100-Pin DAQ Device to Two SCB-68 Connector Blocks
      • Figure 1-4. SCB-68 E Series I/O Connector Pinout (Full)
      • Figure 1-5. SCB-68 E Series I/O Connector Pinout (Extended AI)
      • Figure 1-6. SCB-68 E Series I/O Connector Pinout (Extended Digital)
  • Configuring the SCB-68
  • Safety Information
• Chapter 2 Parts Locator and Wiring Guide
  • Figure 2-1. SCB-68 Printed Circuit Diagram
  • Switch Configuration
    • Table 2-1. Switch Configurations and Affected Signals
• Chapter 3 Connecting Signals
  • Connecting Analog Input Signals
    • Input Modes
      • Figure 3-1. Summary of AI Connections
    • Nonreferenced or Floating Signal Sources
      • Differential Inputs
      • Single-Ended Inputs
    • Ground-Referenced Signal Sources
      • Differential Inputs
      • Single-Ended Inputs
    • Differential Connection Considerations (DIFF Input Mode)
      • Differential Connections for Ground-Referenced Signal Sources
      • Figure 3-2. Differential Input Connections for Ground-Referenced Signals
      • Differential Connections for Nonreferenced or Floating Signal Sources
      • Figure 3-3. Differential Input Connections for Nonreferenced Signals
    • Single-Ended Connection Considerations
      • Single-Ended Connections for Floating Signal Sources (RSE Input Mode)
      • Figure 3-4. Single-Ended Input Connections for Nonreferenced or Floating Signals
      • Single-Ended Connections for Grounded Signal Sources (NRSE Input Mode)
      • Figure 3-5. Single-Ended Input Connections for Ground-Referenced Signals
  • Connecting Analog Output Signals
    • Figure 3-6. Connecting AO Signals
  • Connecting Digital Signals
    • Figure 3-7. Digital I/O Connections
  • Connecting Timing Signals
    • Figure 3-8. Timing I/O Connections
  • Noise Considerations
• Chapter 4 Using Thermocouples
  • Table 4-1. Thermocouple Coloring
  • Switch Settings and Temperature Sensor Configuration
    • Figure 4-1. Single-Ended Switch Configuration
    • Figure 4-2. Differential Switch Configuration
  • Special Considerations
• Chapter 5 Adding Components for Special Functions
  • Channel Pad Configurations
    • Conditioning Analog Input Channels
      • Figure 5-1. Analog Input Channel Configuration Diagram for ACH<i> and ACH<i+8>
      • Table 5-1. Component Location for Analog Input Channels in DIFF Input Mode
    • Conditioning Analog Output Channels
      • Figure 5-2. Analog Output Channel Configuration Diagram
      • Table 5-2. Component Location for Analog Output Channels in DIFF Input Mode
      • Figure 5-3. Analog Output Channel Configuration Diagram for DAC0OUT
    • Conditioning PFI0/TRIG1
      • Figure 5-4. Digital Input Channel Configuration Diagram
      • Figure 5-5. Digital Input Channel Configuration Diagram for PFI0/TRIG1
  • Accuracy and Resolution Considerations
  • Open Thermocouple Detection
    • Differential Open Thermocouple Detection
    • Single-Ended Open Thermocouple Detection
    • Sources of Error
  • Lowpass Filtering
    • Theory of Operation
      • Figure 5-6. Transfer Function Attenuation for an Ideal Filter
      • Figure 5-7. Transfer Function Attenuation for a Real Filter
      • Figure 5-8. Square Wave Input Signal
      • Figure 5-9. Response of an Ideal Filter to a Square Wave Input Signal
      • Figure 5-10. Response of a Real Filter to a Square Wave Input Signal
    • One-Pole Lowpass RC Filter
      • Figure 5-11. Transfer Function of a Simple Series Circuit
    • Selecting Components
    • Adding Components
      • Single-Ended Lowpass Filter
      • Figure 5-12. SCB-68 Circuit Diagram for a Single-Ended Lowpass Filter
      • Differential Lowpass Filter
      • Figure 5-13. SCB-68 Circuit Diagram for a Differential Lowpass Filter
      • Analog Output and Digital Input Lowpass Filtering
    • Lowpass Filtering Applications
      • Noise Filtering
      • Antialiasing Filtering
      • Figure 5-14. Aliasing of a High-Frequency Signal
    • Special Consideration for Analog Input Channels
    • Special Consideration for Analog Output Signals
      • Figure 5-15. Lowpass Filtering of AO Signals
    • Special Consideration for Digital Trigger Input Signals
      • Figure 5-16. Digital Trigger Input Signal with a High-Frequency Component
      • Figure 5-17. Lowpass Filtering of Digital Trigger Input Signals
  • Measuring a 4 to 20mA Current
    • Theory of Operation
      • Figure 5-18. Current-to-Voltage Electrical Circuit
    • Selecting a Resistor
    • Adding Components
      • Single-Ended Inputs
      • Differential Inputs
  • Attenuating Voltage
    • Figure 5-19. Attenuating Voltage with a Voltage Divider
    • Theory of Operation
    • Selecting Components
      • Accuracy Considerations
    • Adding Components
      • Single-Ended Input Attenuators
      • Figure 5-20. SCB-68 Circuit Diagram for SE Input Attenuation
      • Differential Input Attenuators
      • Figure 5-21. SCB-68 Circuit Diagram for DIFF Input Attenuation
      • Analog Output and Digital Input Attenuators
      • Figure 5-22. SCB-68 Circuit Diagram for Digital Input Attenuation
    • Special Considerations for Analog Input
      • Figure 5-23. Input Impedance Electrical Circuit
    • Special Considerations for Analog Output
      • Figure 5-24. Electrical Circuit for Determining Output Impedance
    • Special Considerations for Digital Inputs
• Appendix A Specifications
• Appendix B Quick Reference Labels
  • Figure B-1. E Series Devices
  • Figure B-2. NI 670X Devices
  • Figure B-3. NI 671X/673X Devices
  • Figure B-4. S Series Devices
  • Figure B-5. NI 660X Devices
  • Figure B-6. NI 653X Devices
  • Figure B-7. NI 7811R/7831R Devices
• Appendix C Fuse and Power
• Appendix D SCB-68 Circuit Diagrams
  • Figure D-1. +5 V Power Supply
  • Figure D-2. Cold-Junction Compensation Circuitry
  • Figure D-3. Digital Trigger Circuitry
  • Figure D-4. Analog Output Circuitry
• Appendix E Soldering and Desoldering on the SCB-68
  • Figure E-1. SCB-68 Parts Locator Diagram
• Appendix F Technical Support and Professional Services
• Glossary
  • Numbers/Symbols
  • A-C
  • D
  • E-H
  • I-N
  • O-P
  • R-S
  • T-W
• Index
  • Numbers
  • A
  • B-C
  • D-G
  • I-N
  • O-S
  • T-V