Manuale UtenteSommarioSCXI-1122 User Manual1Support2Worldwide Technical Support and Product Information2National Instruments Corporate Headquarters2Worldwide Offices2Important Information3Warranty3Copyright3Trademarks3WARNING REGARDING USE OF NATIONAL INSTRUMENTS PRODUCTS4Contents5About This Manual8Organization of This Manual8Conventions Used in This Manual9The National Instruments Documentation Set10Related Documentation10Customer Communication11Chapter 1 Introduction12What Your Kit Should Contain12Software Programming Choices13LabVIEW and LabWindows Application Software13NI-DAQ Driver Software13Register-Level Programming15Optional Equipment15Custom Cables16Unpacking16Chapter 2 Configuration and Installation17Module Configuration17Digital Signal Connections19Analog Configuration19Current-Loop Receivers20Hardware Installation22Chapter 3 Signal Connections23Front Connector25Front Signal Connection Descriptions26Analog Input Channel Signal Connections27Excitation Channel Signal Connections30Excitation Level30Using the Internal Half-Bridge Completion31Temperature Sensor Connection31Rear Signal Connector32Rear Signal Connection Descriptions33Analog Output Signal Connections33Digital I/O Signal Connections34Chapter 4 Theory of Operation36Functional Overview36Rear Signal Connector, SCXIbus Connector, and SCXIbus Interface38Digital Control Circuitry38Analog Circuitry38Analog Input Channels38Excitation Output Channels40Chapter 5 Calibration43Overview43Calibration Procedure43Calibration Equipment Requirements43Gain and Offset Calibration44Excitation Calibration46Appendix A Specifications47Analog Input47Excitation49Physical49Environment49Appendix B Customer Communication50Technical Support Form51SCXI-1122 Hardware Configuration Form52Register-Level Programmer Manual Request Form53Documentation Comment Form54Glossary55Numbers/Symbols55A-C55D-I56M-S57T-W58Index59Numbers59A-D59E-L60M-S61T-W62Figures7Figure 1-1. The Relationship between the Programming Environment, NI-DAQ, and Your Hardware14Figure 2-1. SCXI-1122 Parts Locator Diagram18Figure 3-1. SCXI-1122 Front Connector Pin Assignments25Figure 3-2. Ground-Referenced Signal Connection with High Common-Mode Voltage28Figure 3-3. Floating Signal Connection Referenced to Chassis Ground for Better SNR28Figure 3-4. Floating AC-Coupled Signal Connection Referenced to Chassis Ground for Better SNR28Figure 3-5. AC-Coupled Signal Connection with High Common-Mode Voltage29Figure 3-6. Avoiding Relay Wear by Sampling and Averaging Rather Than Single-Sample Channel Scanning30Figure 3-7. Connecting a Quarter-Bridge Strain Gauge to Channel 031Figure 3-8. SCXI-1122 Rear Signal Connector Pin Assignments32Figure 4-1. SCXI-1122 Block Diagram37Figure 4-2. Series Connection with Current Excitation41Figure 4-3. Four-Wire Scan Connection with Multiplexed Current Excitation41Tables7Table 2-1. Digital Signal Connection Jumper Settings19Table 2-2. Jumper W1 Settings20Table 2-3. User-Defined Current Receiver Resistors20Table 3-1. Maximum Load per Excitation Channel31Table 3-2. SCXIbus to SCXI-1122 Rear Signal Connector to DAQ Board Pin Equivalences35Table 4-1. Sense/Current Output Channel Associations39Table 4-2. Pros and Cons of Two-Wire and Four-Wire Connections with Current Excited Transducers42Table 5-1. Maximum Allowable Error Ranges46Dimensioni: 368 KBPagine: 62Language: EnglishApri il manuale
Manuale UtenteSommarioSCXI-1122 User Manual1Support2Worldwide Technical Support and Product Information2National Instruments Corporate Headquarters2Worldwide Offices2Important Information3Warranty3Copyright3Trademarks3WARNING REGARDING USE OF NATIONAL INSTRUMENTS PRODUCTS4Contents5About This Manual8Organization of This Manual8Conventions Used in This Manual9The National Instruments Documentation Set10Related Documentation10Customer Communication11Chapter 1 Introduction12What Your Kit Should Contain12Software Programming Choices13LabVIEW and LabWindows Application Software13NI-DAQ Driver Software13Register-Level Programming15Optional Equipment15Custom Cables16Unpacking16Chapter 2 Configuration and Installation17Module Configuration17Digital Signal Connections19Analog Configuration19Current-Loop Receivers20Hardware Installation22Chapter 3 Signal Connections23Front Connector25Front Signal Connection Descriptions26Analog Input Channel Signal Connections27Excitation Channel Signal Connections30Excitation Level30Using the Internal Half-Bridge Completion31Temperature Sensor Connection31Rear Signal Connector32Rear Signal Connection Descriptions33Analog Output Signal Connections33Digital I/O Signal Connections34Chapter 4 Theory of Operation36Functional Overview36Rear Signal Connector, SCXIbus Connector, and SCXIbus Interface38Digital Control Circuitry38Analog Circuitry38Analog Input Channels38Excitation Output Channels40Chapter 5 Calibration43Overview43Calibration Procedure43Calibration Equipment Requirements43Gain and Offset Calibration44Excitation Calibration46Appendix A Specifications47Analog Input47Excitation49Physical49Environment49Appendix B Customer Communication50Technical Support Form51SCXI-1122 Hardware Configuration Form52Register-Level Programmer Manual Request Form53Documentation Comment Form54Glossary55Numbers/Symbols55A-C55D-I56M-S57T-W58Index59Numbers59A-D59E-L60M-S61T-W62Figures7Figure 1-1. The Relationship between the Programming Environment, NI-DAQ, and Your Hardware14Figure 2-1. SCXI-1122 Parts Locator Diagram18Figure 3-1. SCXI-1122 Front Connector Pin Assignments25Figure 3-2. Ground-Referenced Signal Connection with High Common-Mode Voltage28Figure 3-3. Floating Signal Connection Referenced to Chassis Ground for Better SNR28Figure 3-4. Floating AC-Coupled Signal Connection Referenced to Chassis Ground for Better SNR28Figure 3-5. AC-Coupled Signal Connection with High Common-Mode Voltage29Figure 3-6. Avoiding Relay Wear by Sampling and Averaging Rather Than Single-Sample Channel Scanning30Figure 3-7. Connecting a Quarter-Bridge Strain Gauge to Channel 031Figure 3-8. SCXI-1122 Rear Signal Connector Pin Assignments32Figure 4-1. SCXI-1122 Block Diagram37Figure 4-2. Series Connection with Current Excitation41Figure 4-3. Four-Wire Scan Connection with Multiplexed Current Excitation41Tables7Table 2-1. Digital Signal Connection Jumper Settings19Table 2-2. Jumper W1 Settings20Table 2-3. User-Defined Current Receiver Resistors20Table 3-1. Maximum Load per Excitation Channel31Table 3-2. SCXIbus to SCXI-1122 Rear Signal Connector to DAQ Board Pin Equivalences35Table 4-1. Sense/Current Output Channel Associations39Table 4-2. Pros and Cons of Two-Wire and Four-Wire Connections with Current Excited Transducers42Table 5-1. Maximum Allowable Error Ranges46Dimensioni: 368 KBPagine: 62Language: EnglishApri il manuale
