National Instruments NI 7831R Analog Input

Chapter 2 Hardware Overview ofthe NI 7831R

Figure 2-3. Parts Locator Diagram for the NIPCI-7831R

Analog Input

The NI78 31R has eight independent, 16-bit AI channels that you

can sample simultaneously or at different rates. The input mode is

software-configurable, and the input range is fixed at ±10 V. The

converters return data in two’s complement format. Table2-1 shows the

ideal output code returned for a given AI voltage.

SW1

Contents

Main Page Important Information Warranty Copyright Trademarks Patents Compliance Compliance with FCC/Canada Radio Frequency Interference Regulations Determining FCC Class FCC/DOC Warnings Class A Contents About This Manual Chapter 1 Introduction Chapter 2 Hardware Overview of the NI 7831R Page About This Manual Conventions Reconfigurable I/O Documentation Related Documentation Introduction About the NI 7831R Using PXI with CompactPCI Overview of Reconfigurable I/O Reconfigurable I/O Concept Flexible Functionality User-Defined I/O Resources Device-Embedded Logic and Processing Reconfigurable I/O Architecture Reconfigurable I/O Applications Software Development LabVIEW FPGA Module LabVIEW Real-Time Module Cables and Optional Equipment Custom Cabling Safety Information Page National Instruments Corporation 2-1 NI 7831R User Manual Hardware Overview of the NI 7831R RTSI/PXI Triggers Connector 0 (MIO) PCI/PXI/CompactPCI Bus Figure 2-1. NI7831R Block Diagram Page Analog Input Input Modes Input Range Connecting Analog Input Signals Page Types of Signal Sources Floating Signal Sources Ground-Referenced Signal Sources Input Modes Figure 2-5. Summary of Analog Input Connections Differential Connection Considerations (DIFF Input Mode) Differential Connections for Ground-Referenced Signal Sources Differential Connections for Nonreferenced or Floating Signal Sources Page Single-Ended Connection Considerations Single-Ended Connections for Floating Signal Sources (RSE Input Mode) Single-Ended Connections for Grounded Signal Sources (NRSE Input Mode) Common-Mode Signal Rejection Considerations Analog Output Connecting Analog Output Signals Digital I/O Connecting Digital I/O Signals Page Page RTSI Trigger Bus PXI Local Bus (for NI PXI-7831R only) Switch Settings Power Connections Field Wiring Considerations Calibration Loading Calibration Constants Internal Calibration External Calibration A Specifications Analog Input Input Characteristics Accuracy Information DC Transfer Characteristics Dynamic Characteristics Settling Time Analog Output Output Characteristics Accuracy Information DC Transfer Characteristics Voltage Output Dynamic Characteristics Digital I/O Reconfigurable FPGA Calibration Bus Interface Power Requirement Physical Maximum Working Voltage Storage Environment Shock and Vibration (for NI PXI-7831R Only) Safety Electromagnetic Compatibility CE Compliance B Connecting I/O Signals Appendix B Connecting I/O Signals NI 7831R User Manual B-2 ni.com Figure B-2. NI7831R I/O Connector Pin Assignments DIO Connector Pin Assignment MIO Connector Pin Assignment Caution Connections that exceed any of the maximum ratings of input or output signals Table B-1. I/O Connector Signal Descriptions Connecting to CompactRIO Extension I/O Chassis Table B-2. NI7831R I/O Signal Summary Connecting to 5B and SSR Signal Conditioning Figure B-3. Connector Pinouts when Using NSC68-262650 Cable AO 07 Connector AI 07 Connector DIO 015 Connector Figure B-4. Connector Pinouts when Using the NSC68-5050 Cable DIO 023 Connector DIO 2439 Connector C Using the SCB-68 Shielded Connector Block D Technical Support and Professional Services Page Glossary Numbers/Symbols A B C D Page I L M N O P R S T V W