Spectrogram II (ID=7018)
This is the second generation the original Spectrogram Windaq add-on emplying a more powerful commercial FFT module. It visualizes the frequency domain of an analog waveform in real-time, with 3D color-scaled waterfall spectrogram
Features
- 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 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
- True full ADC resolution
- Multiple Spectrograms can be enabled for different channels under Windaq
- 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 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
- The frame of Spectrogram II is sizable, and the two charts will adjust accordingly
- 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
To Use This WinDaq Add-on
Confirm WinDaq 3.16 or higher is installed on your computer
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.
It provides multiple FFT sizes, higher resolution and scalable charts. The following video demonstrate some of the new features of Spectrogram II
Last update: 02/03/12
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