Document Outline

• SCXI-1121 User Manual
• Support
  • Worldwide Technical Support and Product Information
  • National Instruments Corporate Headquarters
  • Worldwide Offices
• Important Information
  • Warranty
  • Copyright
  • Trademarks
  • WARNING REGARDING USE OF NATIONAL INSTRUMENTS PRODUCTS
• Contents
• About This Manual
  • Conventions
  • Related Documentation
• Chapter 1 Introduction
  • What Your Kit Should Contain
  • Optional Software
  • Optional Equipment
    • Custom Cables
  • Unpacking
• Chapter 2 Configuration and Installation
  • Module Configuration
    • Digital Signal Connections
      • Jumper W44
      • Jumper W38
      • Jumper W32
      • Using Jumpers W32 and W38
    • Analog Configuration
      • Grounding, Shielding, and Reference Mode Selection
      • Input Channel Jumpers
      • Excitation Jumpers
  • Hardware Installation
  • Signal Connections
    • Front Connector
    • Front Connector Signal Descriptions
      • Analog Input Channels
      • Excitation Channels
      • Temperature Sensor Connection
      • Connector-and-Shell Assembly
      • SCXI-1320, SCXI-1328, and SCXI-1321 TerminalBlocks
    • Rear Signal Connector
    • Rear Signal Connector Signal Descriptions
      • Analog Output Signal Connections
      • Digital I/O Signal Connections
      • Timing Requirements and Communication Protocol
      • Communication Signals
• Chapter 3 Theory of Operation
  • Functional Overview
    • SCXIbus Connector
    • SCXIbus Connector Signal Descriptions
  • Digital Interface
  • Digital Control Circuitry
  • Analog and Timing Circuitry
    • Analog Input Channels
    • Excitation Output Channels
    • Calibration
      • Calibration Equipment Requirements
      • Offset Null Adjust
      • Excitation Adjust
    • Analog Output Circuitry
  • Scanning Modes
    • Single-Module Parallel Scanning
    • Multiplexed Scanning
      • Single-Module Multiplexed Scanning
      • Multiple-Module Multiplexed Scanning
      • Multiple-Chassis Scanning
• Chapter 4 Register Descriptions
  • Register Description
    • Register Description Format
    • SCXI-1121 Registers
    • Slot 0 Register Descriptions
• Chapter 5 Programming
  • Programming Considerations
    • Notation
    • Register Writes
      • Register Selection and Write Procedure
      • Initialization
    • Single-Channel Measurements
      • Direct Measurements
      • Indirect Measurements
    • Scanning Measurements
      • 1. Data Acquisition Board Setup Programming
      • 2. Module Programming
      • 3. Programming the Slot 0 Hardscan Circuitry
      • 4. Acquisition Enable, Triggering, and Servicing
  • Scanning Examples
    • Example 1
    • Example 2
    • Example 3
• Appendix A Specifications
• Appendix B Rear Signal Connector
• Appendix C SCXIbus Connector
• Appendix D SCXI-1121 Front Connector
• Appendix E SCXI-1121 Cabling
• Appendix F Revision A and B Photo and Parts Locator Diagrams
• Appendix G Technical Support Resources
• Glossary
  • Numbers/Symbols
  • A
  • B-D
  • E-H
  • I-M
  • N-R
  • S-T
  • U-W
• Index
  • Numbers
  • A-B
  • C
  • D-E
  • F-I
  • J-M
  • N-P
  • R
  • S
  • T-V
  • W
• Figures
  • Figure 2-1. SCXI-1121 General Parts Locator Diagram
  • Figure 2-2. SCXI-1121 Detailed Parts Locator Diagram
  • Figure 2-3. SCXI-1121 Front Connector Pin Assignment
  • Figure 2-4. Ground-Referenced Signal Connection with High Common-Mode Voltage
  • Figure 2-5. Floating Signal Connection Referenced to Chassis Ground for Better Signal-to-Noise Ratio
  • Figure 2-6. Floating AC-Coupled Signal Connection
  • Figure 2-7. AC-Coupled Signal Connection with High Common-Mode Voltage
  • Figure 2-8. Assembling and Mounting the SCXI-1330 Connector-and-Shell Assembly
  • Figure 2-9. Nulling Circuit
  • Figure 2-10. Shunt Circuit
  • Figure 2-11. SCXI-1320 Parts Locator Diagram
  • Figure 2-12. SCXI-1328 Parts Locator Diagram
  • Figure 2-13. SCXI-1321 Parts Locator Diagram
  • Figure 2-14. SCXI-1121 Rear Signal Connector Pin Assignment
  • Figure 2-15. SCANCLK Timing Requirements
  • Figure 2-16. Slot-Select Timing Diagram
  • Figure 2-17. Serial Data Timing Diagram
  • Figure 2-18. Configuration Register Write Timing Diagram
  • Figure 2-19. SCXI-1121 Module ID Register Timing Diagram
  • Figure 3-1. SCXI-1121 Block Diagram
  • Figure 3-2. SCXIbus Connector Pin Assignment
  • Figure 3-3. Digital Interface Circuitry Block Diagram
  • Figure 3-4. SCXI-1121 Digital Control
  • Figure 3-5. Analog Input Block Diagram
  • Figure 3-6. Analog Output Circuitry
  • Figure 3-7. Single-Module Parallel Scanning
  • Figure 3-8. Single-Module Multiplexed Scanning (Direct)
  • Figure 3-9. Single-Module Multiplexed Scanning (Indirect)
  • Figure 3-10. Multiple-Module Multiplexed Scanning
  • Figure 3-11. Multiple-Chassis Scanning
  • Figure B-1. SCXI-1121 Rear Signal Connector Pin Assignment
  • Figure C-1. SCXIbus Connector Pin Assignment
  • Figure D-1. SCXI-1121 Front Connector Pin Assignment
  • Figure E-1. SCXI-1340 Installation
  • Figure E-2. SCXI-1180 Rear Connections
  • Figure E-3. SCXI-1180 Front Panel Installation
  • Figure E-4. Cover Removal
  • Figure F-1. Revision A and B SCXI-1121 Signal Conditioning Module
  • Figure F-2. Revision A and B SCXI-1121 General Parts Locator Diagram
  • Figure F-3. Revision A and B SCXI-1121 Detailed Parts Locator Diagram
• Tables
  • Table 2-1. Digital Signal Connections, Jumper Settings
  • Table 2-2. Jumper W33 Settings
  • Table 2-3. Gain Jumper Allocation
  • Table 2-4. Gain Jumper Positions
  • Table 2-5. Filter Jumper Allocation
  • Table 2-6. Voltage and Current Mode Excitation Jumper Setup
  • Table 2-7. Maximum Load per Excitation Channel
  • Table 2-8. Excitation Level Jumper Selection
  • Table 2-9. Completion Network Jumpers
  • Table 2-10. Trimmer Potentiometer and Corresponding Channel
  • Table 2-11. Nulling Resistors and Corresponding Channel
  • Table 2-12. Jumper Settings of the Nulling Circuits
  • Table 2-13. Jumper Settings on the SCXI-1320 Terminal Block
  • Table 2-14. Jumper Settings on the SCXI-1328 Terminal Block
  • Table 2-15. Jumper Settings on the SCXI-1321 Terminal Block
  • Table 2-16. SCXIbus to SCXI-1121 Rear Signal Connector to Data Acquisition Board Pin Equivalences
  • Table 3-1. SCXIbus Equivalents for the Rear Signal Connector
  • Table 3-2. Calibration Potentiometer Reference Designators
  • Table 5-1. SCXI-1121 Rear Signal Connector Pin Equivalences
  • Table E-1. SCXI-1121 and MIO-16 Pinout Equivalences
  • Table E-2. SCXI-1341 and SCXI-1344 Pin Translations
  • Table E-3. SCXI-1342 Pin Translations
  • Table E-4. SCXI-1343 Pin Connections