Document Outline

• SCXI-1122 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
  • Organization of This Manual
  • Conventions Used in This Manual
  • The National Instruments Documentation Set
  • Related Documentation
  • Customer Communication
• Chapter 1 Introduction
  • What Your Kit Should Contain
  • Software Programming Choices
    • LabVIEW and LabWindows Application Software
    • NI-DAQ Driver Software
    • Register-Level Programming
  • Optional Equipment
    • Custom Cables
  • Unpacking
• Chapter 2 Configuration and Installation
  • Module Configuration
    • Digital Signal Connections
    • Analog Configuration
      • Current-Loop Receivers
  • Hardware Installation
• Chapter 3 Signal Connections
  • Front Connector
    • Front Signal Connection Descriptions
      • Analog Input Channel Signal Connections
      • Excitation Channel Signal Connections
        • Excitation Level
        • Using the Internal Half-Bridge Completion
    • Temperature Sensor Connection
  • Rear Signal Connector
    • Rear Signal Connection Descriptions
      • Analog Output Signal Connections
      • Digital I/O Signal Connections
• Chapter 4 Theory of Operation
  • Functional Overview
    • Rear Signal Connector, SCXIbus Connector, and SCXIbus Interface
    • Digital Control Circuitry
    • Analog Circuitry
      • Analog Input Channels
      • Excitation Output Channels
• Chapter 5 Calibration
  • Overview
  • Calibration Procedure
    • Calibration Equipment Requirements
    • Gain and Offset Calibration
    • Excitation Calibration
• Appendix A Specifications
  • Analog Input
  • Excitation
  • Physical
  • Environment
• Appendix B Customer Communication
  • Technical Support Form
  • SCXI-1122 Hardware Configuration Form
  • Register-Level Programmer Manual Request Form
  • Documentation Comment Form
• Glossary
  • Numbers/Symbols
  • A-C
  • D-I
  • M-S
  • T-W
• Index
  • Numbers
  • A-D
  • E-L
  • M-S
  • T-W
• Figures
  • Figure 1-1. The Relationship between the Programming Environment, NI-DAQ, and Your Hardware
  • Figure 2-1. SCXI-1122 Parts Locator Diagram
  • Figure 3-1. SCXI-1122 Front Connector Pin Assignments
  • Figure 3-2. Ground-Referenced Signal Connection with High Common-Mode Voltage
  • Figure 3-3. Floating Signal Connection Referenced to Chassis Ground for Better SNR
  • Figure 3-4. Floating AC-Coupled Signal Connection Referenced to Chassis Ground for Better SNR
  • Figure 3-5. AC-Coupled Signal Connection with High Common-Mode Voltage
  • Figure 3-6. Avoiding Relay Wear by Sampling and Averaging Rather Than Single-Sample Channel Scanning
  • Figure 3-7. Connecting a Quarter-Bridge Strain Gauge to Channel 0
  • Figure 3-8. SCXI-1122 Rear Signal Connector Pin Assignments
  • Figure 4-1. SCXI-1122 Block Diagram
  • Figure 4-2. Series Connection with Current Excitation
  • Figure 4-3. Four-Wire Scan Connection with Multiplexed Current Excitation
• Tables
  • Table 2-1. Digital Signal Connection Jumper Settings
  • Table 2-2. Jumper W1 Settings
  • Table 2-3. User-Defined Current Receiver Resistors
  • Table 3-1. Maximum Load per Excitation Channel
  • Table 3-2. SCXIbus to SCXI-1122 Rear Signal Connector to DAQ Board Pin Equivalences
  • Table 4-1. Sense/Current Output Channel Associations
  • Table 4-2. Pros and Cons of Two-Wire and Four-Wire Connections with Current Excited Transducers
  • Table 5-1. Maximum Allowable Error Ranges