UltimaSerial WinDaq Software Add-on: FFT
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WinDaq Add-on ID

7017

Menu Name Appeared under WinDaq->View->Add-ons

FFT

Configuration file

C:\Windows\wdqfft.ini

Fast Fourier Transform (FFT) 

This Windaq add-on is the second generation of Windaq Add-on FFT based on a more powerful commercial FFT module. It provides real-time FFT power spectrum for DATAQ's WinDaq  acquisition software, with multiple FFT sizes and higher resolution (see below)

 

    



 

Features

  1. Multiple FFT sizes: 1024, 2048, 4096,  8192, 16384 and 32768
    • Due to Windaq's memory allocation approach, the following rule should be observed if you wish to use this add-on. Please make sure you upgrade to the latest DATAQ ActiveX. WinDaq Activex had a glitch that affects certain configuration of the add-ons and it was fixed recently.
      • 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
      • For FFT size of 16384, up to 3 channels can be enabled in Windaq
      • For FFT size of 32768, only 1 channel can be enabled in Windaq (This is for registered user only)
    • DC component of the signal can be removed before FFT is performed
  2. True full ADC resolution (see side-by-side comparison below) No more need for the Dynamic Amplifier option available in the first generation of FFT
  3. The display of FFT II is sizable  
  4. Channel number is a 0-based index to Windaq's scanlist. For example, if Windaq has channel 3,4,6,7 enabled, one can enter 0 for channel 3, 1 for channel 4, 2 for channel 6 and 3 for channel 7. Must read: The mystery of channel index!
  5. Three scaling options for the frequency axis:

    • Standard Frequency Scaling, each pixel line represents one frequency component and you may use the horizontal scroll bar to scroll the interested frequency range into view.

    • Logarithmic Frequency Scaling,  to fit the full frequency range to the charting area with a logarithmic scale. This is perfect to generate a frequency response like what you see in an audio engineering chart. If Chart persist is checked, you may run a sweeping signal through the whole frequency range and see a frequency response chart of your sensor.

    • Full-fit Frequency Scaling,  to fit the full frequency range to the charting area with a linear scale

  6. While acquiring spectrum, you may
    1. use the left mouse button to drag the waveform up and down
    2. double-click the left of right mouse buttons to change the scaling of the waveform. 
    3. adjust the Analog oscilloscope-like persistence control to study the trend of the spectrum (Refer to the above screen shot for visual effect)
    4. push down the right mouse button to enable a vertical cursor to exam to the waveform.
    5. click on AutoSet button to bring a weak signal into sight immediately
  7. Once you stop the live frequency display, you may 
    1. push down the left mouse button on the chart to enable a vertical cursor and drag it around to study the spectrum
    2. push down the right mouse button on the chart to enable a cross hair and drag it around to study the spectrum
  8. Intelligent Channel Select: Highlight/Select a channel in Windaq and fire up this Windaq add-on, and it will use the selected channel as its default channel

Side-by-side comparison of FFT II and FFT (the signal is totally buried in the noise under the orginal version of FFT)

To Use WinDaq Add-ons

  1. Confirm WinDaq 3.16 or higher is installed on your computer

  2. Install WinDaq add-ons.

  3. Start WinDaq, and you will find the WinDaq add-ons integrated into Windaq->View->Add-ons menu (see the screen capture above).

  4. Intelligent Channel Selection: Highlight/Select a channel in WinDaq and fire up the WinDaq add-on you wish, and the WinDaq add-on will use the selected channel as its default channel. 

  5. If channel index number is required for a WinDaq add-on, please enter the 0-based index to Windaq's scanlist. For example, if WinDaq has channel 3,4,6,7 enabled, one can enter 0 for channel 3, 1 for channel 4, 2 for channel 6 and 3 for channel 7.

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

 

Last update: 06/10/14

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