[time-nuts] BBB DDMTD - analysis

Gerhard Hoffmann dk4xp at arcor.de
Thu Oct 30 20:19:06 UTC 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





More information about the Time-nuts_lists.febo.com mailing list