National Instruments Data Acquisition Device NI USB-621x User Manual
Daq m series
Table of contents
Document Outline
- NI USB-621x User Manual
- Support
- Important Information
- Compliance
- Contents
- About This Manual
- Chapter 1 Getting Started
- Chapter 2 DAQ System Overview
- Chapter 3 Connector and LED Information
- Chapter 4 Analog Input
- Figure 4-1. USB-621x Analog Input Circuitry
- Analog Input Range
- Analog Input Ground-Reference Settings
- Multichannel Scanning Considerations
- Analog Input Data Acquisition Methods
- Analog Input Digital Triggering
- Field Wiring Considerations
- Analog Input Timing Signals
- Figure 4-4. Analog Input Timing Options
- Figure 4-5. Interval Sampling
- Figure 4-6. Posttriggered Data Acquisition Example
- Figure 4-7. Pretriggered Data Acquisition Example
- AI Sample Clock Signal
- AI Sample Clock Timebase Signal
- AI Convert Clock Signal
- Using an Internal Source
- Using an External Source
- Routing AI Convert Clock to an Output Terminal
- Using a Delay from Sample Clock to Convert Clock
- Figure 4-9. AI Sample Clock and AI Convert Clock
- Other Timing Requirements
- Figure 4-10. AI Sample Clock Too Fast For AI Convert Clock; AI Sample Clock Pulses Are Gated Off
- Figure 4-11. AI Convert Clock Too Fast For AI Sample Clock; AI Convert Clock Pulses Are Gated Off
- Figure 4-12. AI Sample Clock and AI Convert Clock Improperly Matched; Leads To Aperiodic Sampling
- Figure 4-13. AI Sample Clock and AI Convert Clock Properly Matched
- Figure 4-14. Single External Signal Driving AI Sample Clock and AI Convert Clock Simultaneously
- AI Convert Clock Timebase Signal
- AI Hold Complete Event Signal
- AI Start Trigger Signal
- AI Reference Trigger Signal
- AI Pause Trigger Signal
- Getting Started with AI Applications in Software
- Connecting Analog Input Signals on USB-6210/6211/6212 Devices
- Table 4-2. USB-6210/6211/6212 Analog Input Configuration
- Connecting Floating Signal Sources
- What Are Floating Signal Sources?
- When to Use Differential Connections with Floating Signal Sources
- When to Use Referenced Single-Ended (RSE) Connections with Floating Signal Sources
- When to Use Non-Referenced Single-Ended (NRSE) Connections with Floating Signal Sources
- Using Differential Connections for Floating Signal Sources
- Figure 4-16. Differential Connections for Floating Signal Sources without Bias Resistors
- Figure 4-17. Differential Connections for Floating Signal Sources with Single Bias Resistor
- Figure 4-18. Differential Connections for Floating Signal Sources with Balanced Bias Resistors
- Figure 4-19. Differential Connections for AC Coupled Floating Sources with Balanced Bias Resistors
- Using Non-Referenced Single-Ended (NRSE) Connections for Floating Signal Sources
- Figure 4-20. NRSE Connections for Floating Signal Sources
- Using Referenced Single-Ended (RSE) Connections for Floating Signal Sources
- Figure 4-21. RSE Connections for Floating Signal Sources
- Connecting Ground-Referenced Signal Sources
- What Are Ground-Referenced Signal Sources?
- When to Use Differential Connections with Ground-Referenced Signal Sources
- When to Use Non-Referenced Single-Ended (NRSE) Connections with Ground-Referenced Signal Sources
- When to Use Referenced Single-Ended (RSE) Connections with Ground-Referenced Signal Sources
- Using Differential Connections for Ground-Referenced Signal Sources
- Figure 4-22. Differential Connections for Ground-Referenced Signal Sources
- Using Non-Referenced Single-Ended (NRSE) Connections for Ground-Referenced Signal Sources
- Figure 4-23. Single-Ended Connections for Ground-Referenced Signal Sources (NRSE Configuration)
- Connecting Analog Input Signals on USB-6215/6216/6218 Devices
- Chapter 5 Analog Output
- Figure 5-1. USB-621x Analog Output Circuitry
- AO Range
- Minimizing Glitches on the Output Signal
- Analog Output Data Generation Methods
- Analog Output Digital Triggering
- Connecting Analog Output Signals
- Analog Output Timing Signals
- Getting Started with AO Applications in Software
- Chapter 6 Digital I/O
- Digital I/O on USB-6210/6211/6215/6218 Devices
- Figure 6-1. USB-6210/6211/6215/6218 Digital I/O Circuitry
- Static DIO on USB-6210/6211/6215/6218 Devices
- I/O Protection on USB-6210/6211/6215/6218 Devices
- Increasing Current Drive on USB-6210/6211/6215/6218 Devices
- Connecting Digital I/O Signals on USB-6210/6211/6215/6218 Devices
- Getting Started with DIO Applications in Software on USB-6210/6211/6215/6218 Devices
- Digital I/O on USB-6212/6216 Devices
- Figure 6-3. USB-6212/6216 Digital I/O Circuitry
- Static DIO on USB-6212/6216 Devices
- I/O Protection on USB-6212/6216 Devices
- Programmable Power-Up States on USB-6212/6216 Devices
- Increasing Current Drive on USB-6212/6216 Devices
- Connecting Digital I/O Signals on USB-6212/6216 Devices
- Getting Started with DIO Applications in Software on USB-6212/6216 Devices
- Digital I/O on USB-6210/6211/6215/6218 Devices
- Chapter 7 PFI
- Chapter 8 Counters
- Figure 8-1. USB-621x Counters
- Counter Input Applications
- Counter Output Applications
- Counter Timing Signals
- Default Counter/Timer Pinouts
- Counter Triggering
- Other Counter Features
- Sample Clock
- Cascading Counters
- Counter Filters
- Prescaling
- Duplicate Count Prevention
- Example Application That Works Correctly (No Duplicate Counting)
- Figure 8-31. Duplicate Count Prevention Example
- Example Application That Works Incorrectly (Duplicate Counting)
- Figure 8-32. Duplicate Count Example
- Example Application That Prevents Duplicate Count
- Figure 8-33. Duplicate Count Prevention Example
- Enabling Duplicate Count Prevention in NI-DAQmx
- Chapter 9 Isolation and Digital Isolators on USB-6215/6216/6218 Devices
- Chapter 10 Digital Routing and Clock Generation
- Chapter 11 Bus Interface
- Chapter 12 Triggering
- Appendix A Device-Specific Information
- Appendix B Troubleshooting
- Appendix C Technical Support and Professional Services
- Glossary
- Index