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This WinDaq addon provides real-time FFT display
Features
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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
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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
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The display of FFT II is sizable
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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!
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Three scaling options for the frequency axis:
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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.
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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.
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Full-fit Frequency Scaling,
to fit the full frequency range to the charting area with a linear scale
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While acquiring spectrum, you may
- use the left mouse button to drag the waveform up and
down
- double-click the left of right mouse buttons to change the scaling of the waveform.
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adjust the Analog oscilloscope-like persistence control to study the
trend of the spectrum (Refer to the above screen shot for visual
effect)
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push down the right mouse button to enable a
vertical cursor to exam to the waveform.
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click on AutoSet button to bring a weak signal into
sight immediately
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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
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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
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Confirm WinDaq 3.16 or higher is installed on your
computer
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Install WinDaq add-ons.
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Start WinDaq, and you will find the WinDaq add-ons
integrated into Windaq->View->Add-ons menu (see the screen
capture above).
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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.
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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.
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Do not change WinDaq's configurations while
WinDaq add-ons are running, or some add-ons may terminate.
WinDaq Add-on ID
7017
Menu Name Appeared under WinDaq->View->Add-ons
FFT
Configuration file
C:\Windows\wdqfft.ini
Last update: 01/26/24
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