Contents
  1. Task Requirements
  2. Implementation

LabVIEW Learning Notes: LabVIEW Learning Notes (I): Basic Introduction LabVIEW Learning Notes (II): Filter Experiment LabVIEW Learning Notes (III): Basic Controls LabVIEW Learning Notes (IV): Dynamic Data Type LabVIEW Learning Notes (V): A Comprehensive Data Type Exercise LabVIEW Learning Notes (VI): While Loops and For Loops LabVIEW Learning Notes (VII): Variables and Shift Registers LabVIEW Learning Notes (VIII): Property Nodes LabVIEW Learning Notes (IX): Arrays and Clusters LabVIEW Learning Notes (X): Case Structures Other Experiment Notes

Task Requirements

  1. Generate a sine-wave signal with a frequency of 0-50M
  2. Allow a selectable sampling rate of 10M, 50M, or 100M
  3. Detect the signal frequency
  4. Output the sampled signal’s power spectrum, and restart averaging if the frequency or sampling rate changes

Implementation

  1. Create a Basic Function Generator on the block diagram, then press Ctrl+H to view its terminal descriptions in Context Help Implementation Implementation (2)
  2. Configure each terminal according to the task requirements. First, right-click Signal Type and create a constant for a sine wave Implementation (3)
  3. Right-click the Frequency and Sampling Information terminals and create controls Implementation (4)
  4. Add two Waveform Measurements Express VIs: Extract Single Tone Information and FFT Power Spectrum and PSD Implementation (5) Implementation (6)
  5. Create indicators on the Detected Power terminal of the Extract Single Tone Information Express VI and the Power Spectrum/PSD terminal of the FFT Power Spectrum and PSD Express VI Implementation (7)
  6. Create a constant on the Display in dB terminal of the FFT Power Spectrum and PSD Express VI and set it to True Implementation (8)
  7. Create a constant on the Averaging Parameters terminal of the FFT Power Spectrum and PSD Express VI and set the averaging method to RMS (root mean square) averaging Implementation (9) Implementation (10)
  8. Because averaging needs to restart, create a constant on the Restart Averaging terminal and set it to True Implementation (11)
  9. Switch back to the front panel, replace the power spectrum indicator with a waveform graph, and replace the frequency control with a knob Implementation (12) Implementation (13)
  10. Modify the scale around the knob Implementation (14) Implementation (15)
  11. Replace the sampling information control with a text ring, then right-click it and select Edit Items to modify its menu, setting the default value to 50M Implementation (16) Implementation (17) Implementation (18)
  12. Modify the display format of the detected frequency Implementation (19)
  13. Apply some simple visual styling, then run the program Implementation (20)