UltimaSerial WinDaq Add-on: Spectrogram

 

Spectrogram

Spectrogram visualizes the frequency domain of an analog waveform in real-time, with 3D color-scaled waterfall spectrogram

Features

  • FFT sizes: 1024, 2048, 4096 and 8192
    • Due to Windaq's memory allocation approach, the following rule should be observed if you wish to use this add-on:
      • For FFT size of 1024, up to 58 channels can be enabled in Windaq
      • For FFT size of 2048, up to 29 channels can be enabled in Windaq
      • For FFT size of 4096, up to 15 channels can be enabled in Windaq
      • For FFT size of 8192, up to 7 channels can be enabled in Windaq
    • DC offset of the signal can be removed before FFT is performed
  • Regarding the update interval
    • The update interval is controlled by Windows's Timer
    • The power of PC's CPU determines if the minimum update interval is achievable or not
    • Actual (averaged) update interval will be displayed on the spectrogram is started
    • Actual (averaged) update interval will be used to calculated the elapsed time for the cross-hair
  • For the Spectrum display on top
    • Single click on AutoSet button will adjust the scale to bring a weak signal into sight immediately
    • While acquiring spectrum, you may
      • use the left mouse button to drag the waveform up and down
      • double-click the left or right mouse button to change the scaling of the waveform. 
      • push down the right mouse button to enable a vertical cursor to exam to the waveform.
    • Once you stop the live frequency display, you may 
      • push down the left mouse button on the chart to enable a vertical cursor and drag it around to study the spectrum
      • push down the right mouse button on the chart to enable a cross hair and drag it around to study the spectrum
  • For the Waterfall display on the bottom
    • The waterfall display follows the scaling and offset of the spectrum display on top
    • You may also click the left mouse button on the waterfall chart to enable a crosshair to show the frequency/elapsed time  
  • Intelligent Channel Select: Highlight/Select a channel in Windaq and fire up this Windaq add-on

To Use WinDaq Add-on Spectrogram

  1. Start WinDaq, and select (highlight) a channel 

  2. Invoke Windaq->View->Add-ons->Spectrogram, and the selected channel will be used as the default channel. 

  3. Do not change WinDaq's configurations while WinDaq add-ons are running, or some add-ons may terminate.

Last update: 07/22/24

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