National Instruments NI 6238 User Manual
Daq m series
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Table of contents
Document Outline
- NI 6238/6239 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. NI 6238/6239 Analog Input Circuitry
- Analog Input Circuitry
- Analog Input Range
- Connecting Analog Current Input Signals
- Analog Input Ground-Reference Settings
- Multichannel Scanning Considerations
- Analog Input Data Acquisition Methods
- Analog Input Triggering
- Field Wiring Considerations
- Analog Input Timing Signals
- Figure 4-7. Analog Input Timing Options
- Figure 4-8. Interval Sampling
- Figure 4-9. Posttriggered Data Acquisition Example
- Figure 4-10. 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 4-12. ai/SampleClock and ai/ConvertClock
- Other Timing Requirements
- Figure 4-13. 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 Analog Output
- Figure 5-1. NI 6238/6239 Analog Current Output Circuitry
- Analog Output Circuitry
- Analog Output Data Generation Methods
- Analog Output Triggering
- Connecting Analog Current Output Signals
- Analog Output Timing Signals
- Getting Started with AO Applications in Software
- Chapter 6 Digital Input and Output
- Chapter 7 Counters
- Figure 7-1. M Series Counters
- Counter Input Applications
- Counting Edges
- Single Point (On-Demand) Edge Counting
- Figure 7-2. Single Point (On-Demand) Edge Counting
- Figure 7-3. Single Point (On-Demand) Edge Counting with Pause Trigger
- Buffered (Sample Clock) Edge Counting
- Figure 7-4. Buffered (Sample Clock) Edge Counting
- Non-Cumulative Buffered Edge Counting
- Figure 7-5. Non-Cumulative Buffered Edge Counting
- Controlling the Direction of Counting
- Pulse-Width Measurement
- Period Measurement
- Semi-Period Measurement
- Frequency Measurement
- Method 1-Measure Low Frequency with One Counter
- Figure 7-11. Method 1
- Method 1b-Measure Low Frequency with One Counter (Averaged)
- Figure 7-12. Method 1b
- Method 2-Measure High Frequency with Two Counters
- Figure 7-13. Method 2
- Method 3-Measure Large Range of Frequencies Using Two Counters
- Figure 7-14. Method 3
- Choosing a Method for Measuring Frequency
- Table 7-1. Frequency Measurement Method 1
- Table 7-2. Frequency Measurement Method Comparison
- Position Measurement
- Two-Signal Edge-Separation Measurement
- Counting Edges
- Counter Output Applications
- Counter Timing Signals
- Default Counter Terminals
- Counter Triggering
- Other Counter Features
- Cascading Counters
- Counter Filters
- Prescaling
- Duplicate Count Prevention
- Example Application That Works Correctly (No Duplicate Counting)
- Figure 7-31. Duplicate Count Prevention Example
- Example Application That Works Incorrectly (Duplicate Counting)
- Figure 7-32. Duplicate Count Example
- Example Application That Prevents Duplicate Count
- Figure 7-33. Duplicate Count Prevention Example
- When To Use Duplicate Count Prevention
- Enabling Duplicate Count Prevention in NI-DAQmx
- Synchronization Modes
- Chapter 8 PFI
- Figure 8-1. NI 6238/6239 PFI Input Circuitry
- Figure 8-2. NI 6238/6239 PFI Output Circuitry
- Using PFI Terminals as Timing Input Signals
- Exporting Timing Output Signals Using PFI Terminals
- Using PFI Terminals as Static Digital Inputs and Outputs
- Connecting PFI Input Signals
- PFI Filters
- I/O Protection
- Programmable Power-Up States
- Connecting Digital I/O Signals
- Chapter 9 Isolation and Digital Isolators
- 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