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© National Instruments Corporation v NI 6238/6239 User Manual
Contents
About This Manual
Conventions ...................................................................................................................xiii
Related Documentation..................................................................................................xiv
NI-DAQ...........................................................................................................xiv
NI-DAQmx for Linux......................................................................................xiv
NI-DAQmx Base.............................................................................................xv
LabVIEW ........................................................................................................xv
LabWindows™/CVI™....................................................................................xvi
Measurement Studio........................................................................................xvi
ANSI C without NI Application Software ......................................................xvi
.NET Languages without NI Application Software ........................................xvii
Device Documentation and Specifications......................................................xvii
Training Courses .............................................................................................xvii
Technical Support on the Web ........................................................................xvii
Chapter 1
Getting Started
Installing NI-DAQmx ....................................................................................................1-1
Installing Other Software...............................................................................................1-1
Installing the Hardware..................................................................................................1-1
Device Pinouts ...............................................................................................................1-1
Device Specifications ....................................................................................................1-2
Device Accessories and Cables .....................................................................................1-2
Chapter 2
DAQ System Overview
DAQ Hardware ..............................................................................................................2-1
DAQ-STC2......................................................................................................2-2
Calibration Circuitry........................................................................................2-3
Sensors and Transducers................................................................................................2-3
Cables and Accessories..................................................................................................2-4
Custom Cabling...............................................................................................2-4
Programming Devices in Software ................................................................................2-5
Chapter 3
Connector Information
I/O Connector Signal Descriptions ................................................................................3-1
RTSI Connector Pinout..................................................................................................3-3
- DAQ M Series 1
- Important Information 3
- Chapter 4 6
- Chapter 5 7
- Chapter 6 7
- Chapter 7 8
- Contents 10
- About This Manual 12
- Related Documentation 13
- NI-DAQmx Base 14
- LabWindows 15
- Measurement Studio 15
- Training Courses 16
- Technical Support on the Web 16
- Getting Started 17
- Device Specifications 18
- Device Accessories and Cables 18
- DAQ System Overview 19
- DAQ-STC2 20
- Sensors and Transducers 21
- Cables and Accessories 22
- Chapter 2 DAQ System Overview 23
- Connector Information 24
- RTSI Connector Pinout 26
- Analog Input 27
- Analog Input Range 28
- (20 mA – (–20 mA)) 29
- = 610 nA 29
- Method 2 30
- Chapter 4 Analog Input 31
- Software 33
- Example 1 35
- Example 2 35
- Software-Timed Acquisitions 36
- Hardware-Timed Acquisitions 36
- Buffered 36
- Analog Input Triggering 37
- Field Wiring Considerations 37
- Analog Input Timing Signals 38
- Channel 0 39
- Channel 1 39
- Convert Period 39
- Sample Period 39
- Sample Counter 40
- AI Sample Clock Signal 41
- Using an Internal Source 42
- Using an External Source 42
- Terminal 42
- Other Timing Requirements 43
- AI Convert Clock Signal 44
- AI Hold Complete Event Signal 47
- AI Start Trigger Signal 48
- Using a Digital Source 48
- Reference Trigger 49
- Pretrigger Samples 49
- Complete Buffer 49
- Posttrigger Samples 49
- AI Pause Trigger Signal 50
- Software-Timed Generations 53
- Hardware-Timed Generations 53
- Non-Buffered 54
- Analog Output Triggering 55
- Analog Output Timing Signals 56
- AO Pause Trigger Signal 57
- Pause Trigger 58
- Sample Clock 58
- Chapter 5 Analog Output 59
- Digital Input and Output 62
- Logic Conventions 64
- Terminals section 67
- Counter Input Applications 68
- Pulse-Width Measurement 71
- Period Measurement 72
- Single Period Measurement 73
- Buffered Period Measurement 73
- Semi-Period Measurement 74
- Frequency Measurement 75
- Counter (Averaged) 76
- Using Two Counters 78
- Figure 7-14. Method 3 79
- Position Measurement 81
- X2 Encoding 82
- X4 Encoding 82
- Channel Z Behavior 82
- Counter Output Applications 86
- Counter Armed 88
- Frequency Generation 89
- Using the Frequency Generator 89
- Frequency Division 90
- Pulse Generation for ETS 90
- Counter Timing Signals 91
- Counter n Gate Signal 93
- Counter n Aux Signal 93
- Counter n Up_Down Signal 94
- Counter n HW Arm Signal 94
- Frequency Output Signal 95
- Default Counter Terminals 96
- Counter Triggering 97
- Other Counter Features 98
- Prescaling 99
- Duplicate Count Prevention 100
- Duplicate Counting) 100
- (Duplicate Counting) 101
- Chapter 7 Counters 102
- Synchronization Modes 103
- Synchronize Count 104
- External Source Mode 105
- Chapter 8 PFI 107
- Connecting PFI Input Signals 108
- PFI Filters 109
- I/O Protection 110
- Programmable Power-Up States 111
- Table 9-1. Ground Symbols 114
- Digital Isolation 115
- Reducing Common-Mode Noise 116
- Digital Routing and Clock 117
- Generation 117
- 80 MHz Timebase 118
- 20 MHz Timebase 118
- 100 kHz Timebase 118
- External Reference Clock 118
- 10 MHz Reference Clock 119
- Terminal 2 120
- Terminal 34 120
- Terminal 33 120
- Terminal 1 120
- Using RTSI as Outputs 121
- RTSI Filters 122
- PXI Clock and Trigger Signals 123
- PXI_CLK10 124
- PXI Triggers 124
- PXI_STAR Trigger 124
- PXI_STAR Filters 124
- Figure 10-4. Filter Example 125
- Table 10-3. Filters 125
- Bus Interface 127
- PXI Considerations 128
- Data Transfer Methods 129
- Interrupt Request (IRQ) 130
- Programmed I/O 130
- Triggering 131
- • Analog input acquisition 132
- • Analog output generation 132
- • Counter behavior 132
- Device-Specific Information 133
- Figure A-1. NI 6238 Pinout 134
- NI 6238 Specifications 135
- Screw Terminal 135
- NI 6239 Pinout 136
- Figure A-2. NI 6239 Pinout 137
- NI 6239 Specifications 138
- Troubleshooting 140
- Analog Output 141
- Counters 142
- Technical Support and 143
- Professional Services 143
- Glossary 145
- Numerics 164
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