National Instruments NI USB-621x User Manual
Daq m series
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Table of contents
Document Outline
- NI USB-621x User Manual
- Support
- Important Information
- Contents
- About This Manual
- Chapter 1 Getting Started
- Chapter 2 DAQ System Overview
- Chapter 3 Connector Information
- Chapter 4 Analog Input
- Figure 4-1. M Series Analog Input Circuitry
- 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 Signal to an Output Terminal
- Using a Delay from Sample Clock to Convert Clock
- Figure 4-9. ai/SampleClock and ai/ConvertClock
- Other Timing Requirements
- Figure 4-10. ai/SampleClock Too Fast
- Figure 4-11. ai/ConvertClock Too Fast
- Figure 4-12. ai/SampleClock and ai/ConvertClock Improperly Matched
- Figure 4-13. ai/SampleClock and ai/ConvertClock Properly Matched
- Figure 4-14. Single External Signal Driving ai/SampleClock and ai/ConvertClock 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
- Chapter 5 Connecting AI Signals on the USB-6210/6211 Devices
- Table 5-1. 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 5-1. Differential Connections for Floating Signal Sources without Bias Resistors
- Figure 5-2. Differential Connections for Floating Signal Sources with Single Bias Resistor
- Figure 5-3. Differential Connections for Floating Signal Sources with Balanced Bias Resistors
- Figure 5-4. Differential Connections for AC Coupled Floating Sources with Balanced Bias Resistors
- Using Non-Referenced Single-Ended (NRSE) Connections for Floating Signal Sources
- Using Referenced Single-Ended (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
- Using Non-Referenced Single-Ended (NRSE) Connections for Ground-Referenced Signal Sources
- Chapter 6 Connecting AI Signals on the USB-6215/6218 Devices
- Chapter 7 Analog Output
- Figure 7-1. M Series Analog Output Circuitry
- 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 8 Digital I/O
- Chapter 9 Counters
- Figure 9-1. M Series Counters
- Counter Input Applications
- Counting Edges
- Single Point (On-Demand) Edge Counting
- Figure 9-2. Single Point (On-Demand) Edge Counting
- Figure 9-3. Single Point (On-Demand) Edge Counting with Pause Trigger
- Buffered (Sample Clock) Edge Counting
- Figure 9-4. Buffered (Sample Clock) Edge Counting
- Non-Cumulative Buffered Edge Counting
- Figure 9-5. Non-Cumulative Buffered Edge Counting
- Controlling the Direction of Counting
- Pulse-Width Measurement
- Period Measurement
- Table 9-1. Time N Descriptions
- Semi-Period Measurement
- Frequency Measurement
- Method 1-Measure Low Frequency with One Counter
- Figure 9-11. Method 1
- Method 1b-Measure Low Frequency with One Counter (Averaged)
- Figure 9-12. Method 1b
- Method 2-Measure High Frequency with Two Counters
- Figure 9-13. Method 2
- Method 3-Measure Large Range of Frequencies Using Two Counters
- Figure 9-14. Method 3
- Choosing a Method for Measuring Frequency
- Table 9-2. Frequency Measurement Method 1
- Table 9-3. Frequency Measurement Method Comparison
- Position Measurement
- Two-Signal Edge-Separation Measurement
- Counting Edges
- Counter Output Applications
- Counter Timing Signals
- Default Counter/Timer Pinouts
- Counter Triggering
- Other Counter Features
- Sample Clock
- Table 9-7. Time N Descriptions
- Cascading Counters
- Counter Filters
- Table 9-8. Filters
- Prescaling
- Duplicate Count Prevention
- Example Application That Works Correctly (No Duplicate Counting)
- Figure 9-32. Duplicate Count Prevention Example
- Example Application That Works Incorrectly (Duplicate Counting)
- Figure 9-33. Duplicate Count Example
- Example Application That Prevents Duplicate Count
- Figure 9-34. Duplicate Count Prevention Example
- Enabling Duplicate Count Prevention in NI-DAQmx
- Chapter 10 PFI
- Figure 10-1. NI 621x PFI Input Circuitry
- Figure 10-2. NI 621x PFI Output Circuitry
- Using PFI Terminals as Timing Input Signals
- Exporting Timing Output Signals Using PFI Terminals
- Using PFI Terminals as Static Digital I/Os
- Connecting PFI Input Signals
- PFI Filters
- I/O Protection
- Programmable Power-Up States
- Chapter 11 Isolation and Digital Isolators
- Chapter 12 Digital Routing and Clock Generation
- Chapter 13 Bus Interface
- Chapter 14 Triggering
- Appendix A Device-Specific Information
- Appendix B Troubleshooting
- Appendix C Technical Support and Professional Services
- Glossary
- Index
- Device Pinouts