User Manuals: National Instruments 4551 Signal Analyzer

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National Instruments 4551 User Manual

National Instruments 4551 User Manual (136 pages)

NI-DSA Software for Computer-Based Instruments

Brand: National Instruments | Category: Measuring Instruments | Size: 0 MB

Table of Contents

Table of Contents
6
Chapter 1 Introduction to NI-DSA

10
- Getting Started with NI-DSA
  10
  - Related Documentation
    11
- NI-DSA Measurement Modes
  11
Chapter 2 Programming with NI-DSA

14
- Basic Concepts
  14
  - Notes for C Programmers
    15
  - Step 1-Initialize
    15
    
    C Example
    15
    
    Labview Example
    15
  - Notes on Examples
    15
  - Step 2-Configure
    16
    
    Labview Example
    16
    
    C Example
    17
    
    Notes on Examples
    17
  - Step 3-Read
    17
  - Step 4-Control
    18
  - Step 5-Close
    18
    
    C Example
    18
    
    Labview Example
    18
Chapter 3 FFT Mode Programming

19
- Step 2-Configure the FFT Analyzer
  22
  - Labview Examples
    23
  - C Examples
    23
    
    Baseband FFT Example
    23
    
    Zoom FFT Example
    24
  - Notes on Examples
    24
    
    Routing
    24
    
    Configuring the FFT Engine
    25
    
    Setting the Span
    25
    
    Averaging
    26
    
    Configuring the FFT Settings
    26
- Step 3-Read FFT Measurements
  27
  - Reading a New Measurement
    27
  - Labview Example
    30
  - C Example
    30
- Step 4-Control
  31
- Using Capture Mode to Acquire Time-Domain Data
  32
- Using Engineering Units
  33
  - Configure Engineering Units
    33
    
    C Example
    34
    
    Labview Example
    34
Chapter 4 Swept-Sine Mode Programming

35
- Step 2-Configure the Swept-Sine Analyzer
  37
  - Configuring Inputs
    37
  - Configuring the Source
    37
  - Labview Example
    38
  - C Example
    38
  - Notes on Examples
    38
    
    Configuring Harmonics Measurements (Optional)
    38
    
    Configuring Custom Frequencies (Optional)
    39
- Step 3-Read Swept-Sine Measurement
  39
  - Reading a New Measurement
    39
  - Labview Example
    41
  - C Example
    41
- Step 4-Control
  43
  - Labview Example
    44
  - C Example
    44
- Source Mode (ni 4551 Only)
  45
- Step 2-Configure Source
  45
  - Labview Examples
    47
  - C Examples
    48
- Step 3-Generate Signal
  48
  - Labview Example
    48
Chapter 5 Octave Analysis (Add-On) Mode Programming

49
- Step 2-Configure the Octave Analyzer
  51
  - Configuring Your Octave and Level Measurement
    51
  - Labview Examples
    52
  - C Example
    53
- Step 3-Read Octave Measurement
  53
  - Labview Examples
    55
  - C Examples
    55
- Step 4-Control
  57
Chapter 6 Advanced Concepts

58
- FFT Analyzer
  58
  - FFT Measurements
    59
  - Dual Channel FFT Analysis
    62
  - Baseband and Zoom Frequency Spans
    64
    
    Alias-Free Bandwidth
    64
    
    Baseband Spans
    65
    
    Classical and Extended FFT Size
    65
    
    The Real Time Zoom FFT Process
    66
    
    Zoom Spans
    66
    
    Zoom Span Characteristics
    68
    
    Windowing
    69
    
    FFT Averaging
    71
- Swept-Sine
  72
  - Why Swept-Sine Measurement
    72
  - Swept-Sine Controls and Settings
    74
    
    Averaging
    74
    
    Sweep Frequency and Auto-Resolution
    74
    
    Input Auto-Ranging
    75
    
    Source Auto-Level and Ramping
    76
  - Swept-Sine Measurements
    77
    
    Cross-Spectrum
    77
    
    Frequency Response
    77
    
    Spectrum
    77
    
    THD - Total Harmonic Distortion
    77
    
    Sinad
    78
    
    RMS Squared
    79
    
    Swept Harmonics
    79
- Octave Analyzer (Add-On)
  80
  - Octave and Level Analyzers Software Architecture
    81
  - Architecture of the Fractional-Octave Analyzer
    81
  - Exact and Preferred Frequencies
    83
  - Summary of NI-DSA Octave Mode Functions
    86
  - Level Measurements
    87
  - Averaging Modes
    89
    
    Linear Averaging
    89
    
    Exponential Averaging
    91
    
    Equal Confidence Averaging
    92
    
    Impulse + Linear Averaging
    92
    
    Peak Averaging
    92
    
    A-, B-, and C-Weighting
    93
    
    Considerations for Octave and Level Measurements
    93
    
    Configuration Limits
    95
    
    Frequency Ranges
    98
    
    Settling Time
    98
- Overload Detection
  99
Appendix A Common Questions

101
- FFT Mode
  101
  - FFT Analysis Questions
    101
  - Zoom FFT Analysis Questions
    103
- Source Mode
  105
- Swept-Sine Mode
  107
- Octave and Level Analyzer Mode (Add-On
  109
Appendix B

117
Technical Support Resources

117
Glossary

119

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