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Contents Conventions ............................................................................................ 2 Using the Spectral Measurements Toolkit..............................................3 Integrating the Spectral Measurements Toolkit...............................4 Locating the Spectral Measurements Toolkit .................................. 4 SMT Programming Flow Diagram ......................................................... 5 Advanced-Level VIs ........................................................................ 6 Using LabVIEW Spectral Measurements Examples .............................. 7 SMT Simulation Examples..............................................................7 SMT Spectrum Analyzer (simulated).......................................7 SMT ACP (simulated) .............................................................. 8 Using LabWindows/CVI Spectral Measurements Examples ................. 9 Continuous Zoom FFT..................................................................... 9 Frequency Response Measurement ................................................. 9 CrossPower Spectrum Measurement..............................................10 Using Spectral Measurements Toolkit Techniques ................................ 10 Zoom FFT ........................................................................................ 10 Continuous Zoom FFT..................................................................... 12 Block Zoom FFT ............................................................................. 14 Determining When to Use Continuous or Block Zoom FFT........... 14 Zoom Spectrogram .......................................................................... 15 Configuring Zoom FFT VIs....................................................................18 Center Frequency and Span ............................................................. 18 Resolution Bandwidth, Spectral Lines, and Window ...................... 20 Choosing Useful Configuration Parameters .................................... 22 Spectral Domain Averaging.................................................................... 24 Averaging Conventions ................................................................... 25 Averaging Options...........................................................................26 Averaged FFT Spectrum.................................................................. 27 Averaged Power Spectrum .............................................................. 28 Averaged Cross Spectrum ................................................................28 Averaged Frequency Response ........................................................29 Spectral Domain Measurements..............................................................29 Unit Conversion................................................................................29 Peak Search and Amplitude/Frequency Estimation .........................31 Power in Band ..................................................................................32 Adjacent Channel Power (ACP).......................................................32 Occupied Bandwidth (OBW) ...........................................................33 Where to Go for Support .........................................................................34 Conventions The following conventions are used in this manual: » The » symbol leads you through nested menu items and dialog box options to a final action. The sequence File»Page Setup»Options directs you to pull down the File menu, select the Page Setup item, and select Options from the last dialog box. <> Italic text enclosed in angle brackets represents directory names and parts of paths that may vary on different computers, such as . This icon denotes a note, which alerts you to important information. bold Bold text denotes items that you must select or click in the software, such as menu items and dialog box options. Bold text also denotes parameter names and palette names. italic Italic text denotes variables, emphasis, a cross-reference, or an introduction to a key concept. Italic text also denotes text that is a placeholder for a word or value that you must supply. monospace Text in this font denotes text or characters that you should enter from the keyboard, sections of code, programming examples, and syntax examples. This font is also used for the proper names of disk drives, paths, directories, programs, subprograms, subroutines, device names, functions, operations, variables, filenames, and extensions. monospace italic Italic text in this font denotes text that is a placeholder for a word or value that you must supply. NI Spectral Measurements Toolkit User Guide 2 ni.com Using the Spectral Measurements Toolkit The Spectral Measurements Toolkit contains LabVIEW VIs and LabWindows/CVI functions that perform the following operations: • Zoom frequency analysis—Zoom fast Fourier transform (FFT) fun...

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