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Cake day: June 25th, 2025

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  • 1/(900Hz) = 0.00111 seconds = 1.11 ms for each full sine width. Your time base is 0.5ms and you can fit 5ms width on the screen. If only a 900Hz signal is present, you should see 5ms/1.11ms = 4.5 full sines on your display. However, the signal appears to be much more dense, so there’s definitely high frequency contributors. Zoom in on the time axis and see what’s going on, with single shots if needed as someone else suggested. Whatever the other contibutors are they are possibly riding on a 900Hz horse, so unfortunately setting it to trigger is tricky. I would move the trigger value up until it stops triggering, then gently lower it until it taps the max of the overall waveform. Then you will just be sampling the sine(90°) locations on your 900Hz. Oh also, just by eyeballing it looks like the waveform envelope has a period of 1.5ms, 1/(0.0015 seconds) = 667Hz. If my eyeballing is bad then it might really be 900. But as someone else said if this is a PWM’d signal what you’re seeing could be explained by not filtering out frequencies above the widths it is using.



  • I have gotten a couple cheap, good items from Aliexpress, but htf do I work around:

    • absolutely no respect for search terms. All search results are the equivalent of searching for each word in my search alone, mixing the results together, and randomly choosing one to overprioritize. Quotes and minuses ignored.
    • I will click on an item and it will take me to a blank page saying no such item exists or it’s not available or something, I don’t quite remember. But after a couple successful purchases this started happening for every single item before I stopped using it because this was blocking me from buying stuff.