Spectrogram Windaq add-on employs a powerful FFT module. It visualizes the
frequency domain of an analog waveform in real-time, with 3D color-scaled
Multiple FFT sizes: 1024, 2048, 4096 and 8192
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.
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
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
For FFT size of 8192, up to 7 channels can be enabled in
DC component of the signal can be removed before FFT is
Multiple Spectrograms can be enabled for different channels under
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!
Regarding the update interval
The update interval is controlled by Windows's Timer, which is
15.6ms minimum by default under Windows 7
20ms minimum by default under Windows XP
The power of PC's CPU also 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
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.
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
also click the left mouse button on the waterfall chart to enable a crosshair to show
the frequency/elapsed time
Select: Highlight/Select a channel in Windaq and fire up this
Windaq add-on, and it will use the selected channel as its default
To Use This WinDaq Add-on
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
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.
multiple FFT sizes, higher resolution and scalable charts. The following video demonstrate
some of the new features of