National Instruments SCXI-1121 Manual de usuario Pagina 5
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Contents
SCXI-1121 User Manual vi www.natinst.com
Chapter 3
Theory of Operation
Functional Overview ..................................................................................................... 3-1
SCXIbus Connector ........................................................................................ 3-3
SCXIbus Connector Signal Descriptions........................................................ 3-4
Digital Interface............................................................................................................. 3-6
Digital Control Circuitry ............................................................................................... 3-7
Analog and Timing Circuitry ........................................................................................ 3-8
Analog Input Channels.................................................................................... 3-8
Excitation Output Channels ............................................................................3-11
Calibration....................................................................................................... 3-11
Calibration Equipment Requirements ..............................................3-11
Offset Null Adjust ............................................................................ 3-12
Excitation Adjust .............................................................................. 3-13
Analog Output Circuitry ................................................................................. 3-15
Scanning Modes ............................................................................................................ 3-17
Single-Module Parallel Scanning.................................................................... 3-17
Multiplexed Scanning ..................................................................................... 3-17
Single-Module Multiplexed Scanning.............................................. 3-18
Multiple-Module Multiplexed Scanning .......................................... 3-19
Multiple-Chassis Scanning............................................................... 3-20
Chapter 4
Register Descriptions
Register Description...................................................................................................... 4-1
Register Description Format........................................................................... 4-1
SCXI-1121 Registers ...................................................................................... 4-1
Slot 0 Register Descriptions............................................................................ 4-5
Chapter 5
Programming
Programming Considerations........................................................................................ 5-1
Notation........................................................................................................... 5-1
Register Writes................................................................................................ 5-2
Register Selection and Write Procedure...........................................5-2
Initialization...................................................................................... 5-3
Single-Channel Measurements ....................................................................... 5-4
Direct Measurements........................................................................ 5-4
Indirect Measurements ..................................................................... 5-5
Scanning Measurements ................................................................................. 5-7
1. Data Acquisition Board Setup Programming ............................... 5-7
- SCXI-1121 User Manual 1
- Important Information 3
- Contents 4
- About This Manual 9
- Related Documentation 10
- Introduction 11
- What Your Kit Should Contain 12
- Optional Software 12
- Chapter 1 Introduction 13
- Optional Equipment 14
- Custom Cables 15
- Unpacking 16
- Module Configuration 17
- Digital Signal Connections 19
- Jumper W44 19
- Jumper W38 20
- Jumper W32 20
- Using Jumpers W32 and W38 20
- Analog Configuration 22
- Selection 22
- Input Channel Jumpers 24
- Excitation Jumpers 25
- Excitation Level 26
- Table 2-9 28
- Completion Network Jumpers 28
- 2 W27 and W28 29
- 3 W39 and W40 29
- Disable Network 29
- (Factory Setting) 29
- Hardware Installation 30
- Signal Connections 31
- Front Connector 32
- Analog Input Channels 36
- Ω resistor is 37
- Excitation Channels 38
- Temperature Sensor Connection 38
- Connector-and-Shell Assembly 38
- Terminal Blocks 40
- Table 2-10 41
- Figure 2-9. Nulling Circuit 43
- Figure 2-10. Shunt Circuit 45
- DTEMP MTEMP 48
- Warnings 49
- Terminal Block Installation 52
- Communication Signals 58
- SLOT0SEL* 61
- SERDATIN 61
- 01 00001100001111 61
- Programming 62
- Theory of Operation 63
- Chapter 3 Theory of Operation 64
- Digital Interface 68
- Digital Control Circuitry 69
- Analog and Timing Circuitry 70
- Excitation Output Channels 73
- Calibration 73
- Offset Null Adjust 74
- Excitation Adjust 75
- Analog Output Circuitry 77
- Scanning Modes 79
- Figure 3-8 80
- Register Descriptions 83
- Module ID Register 84
- Configuration Register 85
- Slot 0 Register Descriptions 87
- Slot-Select Register 88
- 765432 1 0 89
- FIFO Register 91
- Register Writes 93
- Initialization 94
- Single-Channel Measurements 95
- Direct Measurements 95
- Indirect Measurements 96
- Scanning Measurements 98
- Counter 1 and SCANDIV 100
- 2. Module Programming 101
- Chapter 5 Programming 102
- Multiple-Chassis Scanning 103
- 101S 1100 to the HSCR 105
- 101S 1110 to the HSCR 105
- 101S 1111 to the HSCR 105
- Scanning Examples 106
- Example 3 107
- Specifications 109
- Appendix A Specifications 110
- RTD Mode 111
- Strain Gauge Mode 111
- Cold-Junction Sensor 111
- Physical 112
- Environment 112
- Rear Signal Connector 113
- SCXIbus Connector 115
- Appendix C SCXIbus Connector 116
- SCXI-1121 Front Connector 119
- SCXI-1121 Cabling 123
- Appendix E SCXI-1121 Cabling 124
- SCXI-1340 Installation 125
- Lab-LC Cable Assembly 126
- SCXI-1180 Feedthrough Panel 130
- SCXI-1180 Installation 131
- SCXI-1302 Wiring Procedure 132
- SCXI-1302 Installation 133
- SCXI-1351 Installation 134
- SCXI-1350 Installation 135
- SCXI-1343 Installation 136
- Revision A and B Photo and 139
- Parts Locator Diagrams 139
- Technical Support Resources 142
- Worldwide Support 143
- Glossary 144
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