[time-nuts] BBB DDMTD - analysis

Gerhard Hoffmann dk4xp at arcor.de
Thu Oct 30 16:19:06 EDT 2014


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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