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
Multiple FFT sizes: 1024, 2048, 4096, 8192, 16384
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
For FFT size of 2048, up to 29 channels can be enabled in
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
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
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!
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
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
While acquiring spectrum, you may
use the left mouse button to drag the waveform up and
double-click the left of right mouse buttons to change the scaling of the waveform.
adjust the Analog oscilloscope-like persistence control to study the
trend of the spectrum (Refer to the above screen shot for visual
push down the right mouse button to enable a
vertical cursor to exam to the waveform.
click on AutoSet button to bring a weak signal into
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
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
Confirm WinDaq 3.16 or higher is installed on your
Install WinDaq add-ons.
Start WinDaq, and you will find the WinDaq add-ons
integrated into Windaq->View->Add-ons menu (see the screen
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.
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.
Do not change WinDaq's configurations while
WinDaq add-ons are running, or some add-ons may terminate.