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Chapter 6 Digital Routing and Clock Generation
80 MHz Timebase
You can use the 80 MHz Timebase as the Source input to the 32-bit general-purpose
counter/timers.
The 80 MHz Timebase can be generated from the onboard oscillator.
20 MHz Timebase
The 20 MHz Timebase normally generates many of the AI and AO timing signals. It can
function as the Source input to the 32-bit general-purpose counter/timers.
The 20 MHz Timebase is generated by dividing down the 80 MHz Timebase, as shown in
Figure 6-1.
100 kHz Timebase
You can use the 100 kHz Timebase to generate many of the AI and AO timing signals. It can
also function as the Source input to the 32-bit general-purpose counter/timers.
The 100 kHz Timebase is generated by dividing down the 20 MHz Timebase by 200, as shown
in Figure 6-1.
- -918x/919x 1
- Legal Information 3
- Export Compliance Information 4
- Contents 5
- Chapter 3 6
- Chapter 4 7
- Chapter 5 7
- Counters 7
- © National Instruments 9
- Getting Started with the 10
- NI cDAQ-9184 Chassis 11
- NI cDAQ-9188 Chassis 11
- Safety Guidelines 12
- 1-4 13
- Hardware Symbol Definitions 14
- Unpacking 14
- Installing the cDAQ Chassis 14
- 1-6 15
- © National Instruments 16
- 1-8 17
- <network> 18
- 1-10 19
- MAX Icons and States 20
- 1-12 21
- Reserving the Chassis in MAX 23
- QoS Priority 23
- Mounting the cDAQ Chassis 24
- NI 9901 Desktop Mounting Kit 25
- NI cDAQ-9181/9191 26
- 1-18 27
- © National Instruments 28
- NI cDAQ-9184/9188 29
- © National Instruments 30
- NI cDAQ-9184 31
- NI CompactDAQ 31
- NI cDAQ Chassis Features 34
- LED State/Chassis Status 35
- © National Instruments 36
- Ethernet Cabling 37
- Reset Button 38
- Power Connector 38
- PFI BNC Connectors 38
- Cables and Accessories 39
- Using the cDAQ Chassis 40
- 1-32 41
- © National Instruments 42
- Analog Input 43
- AI Sample Clock Signal 44
- Scanned Modules 45
- Sigma-Delta Modules 45
- AI Start Trigger Signal 46
- AI Reference Trigger Signal 47
- AI Pause Trigger Signal 48
- Using an Analog Source 49
- Analog Output 50
- Hardware-Timed Generations 51
- Analog Output Timing Signals 52
- AO Start Trigger Signal 53
- AO Pause Trigger Signal 54
- for more 55
- Digital Input/Output and PFI 56
- Static DIO 57
- Digital Input 57
- Using an Internal Source 58
- Using a Digital Source 59
- Using an External Source 59
- Change Detection Event 62
- Digital Output 63
- Buffered Digital Output 64
- Digital Output Timing Signals 65
- PFI Filters 68
- PFI Filter Example 69
- Counter Timing Engine 71
- Counter Input Applications 72
- 10763 452 73
- Pulse-Width Measurement 74
- Latched Value 75
- Pulse Measurement 76
- Single Pulse Measurement 77
- Semi-Period Measurement 78
- Frequency Measurement 79
- © National Instruments 80
- 5-12 81
- Chapter 5 Counters 81
- © National Instruments 82
- 5-14 83
- Frequency Measurement Methods 84
- Which Method Is Best? 85
- © National Instruments 86
- Period Measurement 87
- Position Measurement 88
- Channel Z Behavior 89
- Buffered Position Measurement 90
- 000123 4567880 8 91
- © National Instruments 92
- Counter Output Applications 93
- Pulse Train Generation 94
- 4 3 210210 43 210210 95
- 5-28 97
- Counter Armed 98
- Frequency Generation 99
- Frequency Division 100
- Counter Timing Signals 101
- Counter n Source Signal 102
- Counter n Gate Signal 103
- Counter n Aux Signal 104
- Counter n Sample Clock Signal 105
- Counter n Up_Down Signal 105
- Counter n HW Arm Signal 105
- Frequency Output Signal 106
- Default Counter/Timer Routing 107
- Counter Triggering 107
- Other Counter Features 108
- 80 MHz Source Mode 109
- Digital Routing and Clock 110
- Generation 110
- 80 MHz Timebase 111
- 20 MHz Timebase 111
- 100 kHz Timebase 111
- NI cDAQ-9191 Regulatory 112
- Information 112
- A-2 113
- EU Regulatory Statements 114
- Singapore 115
- *0107898581340997* 116
- Where to Go from Here 117
- NI-DAQmx 118
- LabWindows/CVI 118
- Measurement Studio 119
- Training Courses 120
- Technical Support on the Web 120
- Technical Support and 121
- Professional Services 121
- C-2 122
- Numerics 123
- I-2 124
- NI cDAQ-918x/919x User Manual 125
- © National Instruments 125
- I-4 126
- © National Instruments 127
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