How to reset Sound and Vibration Spectral map

Hi,
I want to create a Campbell diagram for a rotating machine, in live (while the machine is rotating).
This diagram is basically a graph of the spectral content a a signal (Hz), versus the rotation speed (RPM).
I've found an express VI that seems to do what i want to do (Spectral Map, in the Sound and Vibration toolkit). The output of this VI is buffered so that it can run in live (The buffer vi is also a vi that comes from the Sound and Vibration toolkit).
The block diagram of my complete process is attached to this message, sorry it's a bit messy.
On the first run, this VI works as expected: as the machine is running up, the graph is filling up. Now if I want to make a second run-up, i need to first reset the VI. However once the vi has been reset, it won't ouput anydata!
I've tried different combination:
- Reset "Waterfall and Campbell.vi" and the buffer
- Reset only the buffer
- Reset only the "Waterfall and Campbell.vi"
None of them work, the colormap stays black.
So does anyone know how to use this express vi? I could find an exemple that works with live data and buffering.
Thanks,
Regards,
peper
Attachments:
Reset waterfall.png ‏74 KB

Hi,
Attached to this post, you'll find a piece of code that replicates the problem I have in my main application.
If you run the vi with an initial small frequency (the frequency dial up simulates the rotation speed) and then increase that speed, you'll notice that the spectral map gets filled as expected.
The problem arises when I try to reset the spectral map (=do a new run-up):
- I set the frequency to a minimum
- I hit the reset button (the spectral map is emptied as expected)
- I slowly increase the frequency ===> the spectral map does NOT get filled up anymore. Or it gets filled up like 30 seconds after the run up or gets partially filled up.... in summary there is something wrong with the map each time I try to reset the septral map vi.
Let me know if you need more information.
Best regards,
peper2001
Attachments:
Campbell.zip ‏101 KB

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