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Chapter 2 Analog Input
When the reference trigger occurs, the cDAQ chassis continues to write samples to the buffer
until the buffer contains the number of posttrigger samples desired. Figure 2-3 shows the final
buffer.
Figure 2-3. Reference Trigger Final Buffer
Using a Digital Source
To use Reference Trigger with a digital source, specify a source and a rising or falling edge.
Either PFI or one of several internal signals on the cDAQ chassis can provide the source. Refer
to the Device Routing in MAX topic in the NI-DAQmx Help or the LabVIEW Help for more
information.
Using an Analog Source
Some C Series I/O modules can generate a trigger based on an analog signal. In NI-DAQmx, this
is called the Analog Comparison Event.
When you use an analog trigger source, the acquisition stops on the first rising or falling edge of
the Analog Comparison Event signal, depending on the trigger properties.
Note Depending on the C Series I/O module capabilities, you may need two
modules to utilize analog triggering.
Routing the Reference Trigger Signal to an Output Terminal
You can route Reference Trigger to any output PFI terminal. Reference Trigger is active high by
default.
AI Pause Trigger Signal
You can use the Pause Trigger to pause and resume a measurement acquisition. The internal
sample clock pauses while the external trigger signal is active and resumes when the signal is
inactive. You can program the active level of the pause trigger to be high or low.
Using a Digital Source
To use the Pause Trigger, specify a source and a polarity. The source can be either from PFI or
one of several other internal signals on your cDAQ chassis. Refer to the Device Routing in MAX
topic in the NI-DAQmx Help or the LabVIEW Help for more information.
Reference Trigger
Pretrigger Samples
Complete Buffer
Posttrigger Samples
- -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
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- QoS Priority 23
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- NI 9901 Desktop Mounting Kit 25
- NI cDAQ-9181/9191 26
- 1-18 27
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- Ethernet Cabling 37
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- 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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