Am 30.10.2014 um 20:08 schrieb Hal Murray:
17 microseconds is 58 KHz. That's a reasonable number for a switching power
supply.
What does your power look like?
I don't know what you are using for a circuit. My guess is that the crap on
the power is shifting the switching point slightly. Note that both your
scope and your BBB are digital sampling systems so you have opportunities for
aliasing.
Yes, the energy saving lamp on my lab table wobbles 50 to 60 KHz and back.
I must switch it off when I work with the 89441A and my low noise preamp.
17 us is much too long for metastability. No processor would work with
anything like that.
regards, Gerhard
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