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© National Instruments | 1-3
NI cDAQ-918x/919x User Manual
Safety Guidelines
Operate the NI cDAQ-918x/919x chassis only as described in this user manual.
Caution Refer to the Read Me First: Safety and Electromagnetic Compatibility
document for important safety and electromagnetic compatibility information. To
obtain a copy of this document online, visit ni.com/manuals and search for the
document title.
Caution Do not operate the NI cDAQ-918x/919x in a manner not specified in this
user manual. Product misuse can result in a hazard. You can compromise the safety
protection built into the product if the product is damaged in any way. If the product
is damaged, return it to National Instruments for repair.
Note Because some C Series I/O modules may have more stringent certification
standards than the NI cDAQ-918x/919x chassis, the combined system may be limited
by individual component restrictions. Refer to the specifications document for your
cDAQ chassis for more details.
Hot Surface This icon denotes that the component may be hot. Touching this
component may result in bodily injury.
Safety Guidelines for Hazardous Locations
The NI cDAQ-9181/9184/9188/9191 chassis is suitable for use in Class I, Division 2, Groups A,
B, C, D, T4 hazardous locations; Class 1, Zone 2, AEx nA IIC T4 and Ex nA IIC T4 hazardous
locations; and nonhazardous locations only. Follow these guidelines if you are installing the
NI cDAQ-918x/919x chassis in a potentially explosive environment. Not following these
guidelines may result in serious injury or death.
Caution When operating the cDAQ chassis in hazardous locations, you must use a
power supply rated for hazardous locations. The power supply included in the cDAQ
chassis kit is not hazardous locations-certified. Visit
ni.com to find hazardous
locations-certified power supplies.
Caution Do not disconnect the power supply wires and connectors from the chassis
unless power has been switched off.
Caution Substitution of components may impair suitability for Class I, Division 2.
Caution For Zone 2 applications, install the chassis in an enclosure rated to at least
IP 54 as defined by IEC/EN 60529.
- -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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