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Chapter 2 DAQ System Overview
NI 6124/6154 User Manual 2-2 ni.com
DAQ Hardware
DAQ hardware digitizes signals, performs D/A conversions to generate
analog output signals, and measures and controls digital I/O signals. The
following sections contain more information about specific components of
the DAQ hardware.
Figure 2-2 shows the components of the non-isolated S Series (NI 6124)
device.
Figure 2-2. General NI 6124 Block Diagram
Analog Output
Digital I/O
Analog Input
Counters
PFI
RTSI
Bus
Interface
Bus
I/O Connector
Digital
Routing
- DAQ S Series 1
- Important Information 3
- Compliance 4
- Chapter 5 6
- Chapter 6 7
- Chapter 7 7
- Counters 7
- Chapter 8 9
- Chapter 9 9
- Contents 10
- About This Manual 11
- Related Documentation 12
- LabWindows/CVI 13
- Measurement Studio 13
- Training Courses 15
- Technical Support on the Web 15
- Getting Started 16
- Installing the Hardware 17
- Device Self-Calibration 17
- Device Pinouts 18
- Device Specifications 18
- DAQ System Overview 19
- DAQ Hardware 20
- DAQ-STC2 21
- Calibration Circuitry 22
- Signal Conditioning 23
- Sensors and Transducers 23
- NI-DAQ\Examples\ 24
- DAQmx ANSI C Dev 24
- I/O Connector 25
- Specifications 26
- +5 V Power Source 27
- Analog Input 28
- (NI 6154 Only) The digital 29
- Input Polarity and Range 30
- Working Voltage Range 31
- AI Data Acquisition Methods 31
- Chapter 4 Analog Input 32
- Analog Input Triggering 33
- Types of Signal Sources 34
- Non-Isolated Devices 36
- DC-Coupled 37
- AC-Coupled 38
- Field Wiring Considerations 38
- Analog Input Timing Signals 40
- AI Sample Clock Signal 41
- Using an Internal Source 41
- Using an External Source 42
- Terminal 42
- Other Timing Requirements 42
- AI Convert Clock Signal 43
- AI Hold Complete Event Signal 45
- AI Start Trigger Signal 45
- Using a Digital Source 45
- Using an Analog Source 46
- AI Reference Trigger Signal 46
- Analog Output 49
- AO Data Generation Methods 50
- Chapter 5 Analog Output 51
- Analog Output Triggering 52
- AO Sample Clock Signal 54
- AO Start Trigger Signal 57
- AO Pause Trigger Signal 58
- Digital I/O 60
- Chapter 6 Digital I/O 61
- DI Sample Clock Signal 63
- DO Sample Clock Signal 64
- Counter Input Applications 74
- Chapter 7 Counters 75
- Pulse-Width Measurement 76
- Period Measurement 78
- Single Period Measurement 78
- Buffered Period Measurement 79
- Semi-Period Measurement 79
- Frequency Measurement 81
- Figure 7-11. Method 1b 82
- Figure 7-12. Method 2 83
- Figure 7-13. Method 3 84
- Position Measurement 86
- Channel Z Behavior 87
- 8 9 0 2 1 7 4 3 88
- Counter Output Applications 91
- Pulse Train Generation 93
- Finite Pulse Train Generation 94
- Frequency Generation 95
- Using the Frequency Generator 95
- Frequency Division 96
- Pulse Generation for ETS 96
- Counter Timing Signals 97
- Counter n Source Signal 98
- Counter n Gate Signal 99
- Counter n Aux Signal 100
- Counter n Up_Down Signal 101
- Counter n HW Arm Signal 101
- Default Counter/Timer Pinouts 102
- Counter Triggering 103
- Other Counter Features 104
- Prescaling 105
- Duplicate Count Prevention 106
- (No Duplicate Counting) 107
- (Duplicate Counting) 108
- Synchronization Modes 109
- 80 MHz Source Mode 110
- Other Internal Source Mode 111
- External Source Mode 111
- Programmable Function 112
- Interfaces (PFI) 112
- PFI for Isolated Devices 113
- Connecting PFI Input Signals 117
- PFI Filters 117
- Figure 8-5. Filter Example 118
- Table 8-1. Filters 118
- I/O Protection 119
- Programmable Power-Up States 119
- Digital Routing and Clock 121
- Generation 121
- 80 MHz Timebase 122
- 20 MHz Timebase 122
- 100 kHz Timebase 122
- External Reference Clock 122
- 10 MHz Reference Clock 123
- RTSI Connector Pinout 124
- Using RTSI as Outputs 125
- RTSI Filters 126
- Figure 9-3. Filter Example 127
- Table 9-2. Filters 127
- PXI Clock and Trigger Signals 128
- PXI_STAR Filters 129
- Routing Signals in Software 130
- Bus Interface 131
- Data Transfer Methods 132
- Triggering 133
- Digital Trigger 134
- Analog Trigger Types 135
- Analog Comparison Event 136
- Chapter 11 Triggering 137
- Analog Trigger Accuracy 138
- Device-Specific Information 139
- NI 6124 I/O Connector Pinout 140
- NI 6124 Block Diagram 142
- Using BNCs 143
- Using Screw Terminals 143
- NI 6124 Specifications 144
- NI 6154 Analog Output 145
- NI 6154 I/O Connector Pinout 146
- NI 6154 Block Diagram 148
- Table A-3. Ground Symbols 149
- Digital Isolation 150
- NI 6154 Specifications 151
- Technical Support and 152
- Professional Services 152
- Glossary 154
- Numerics 165
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