[time-nuts] Mains Frequency

[Andy Talbot]

It's still +47 seconds.    Perhaps they'll correct over the weekend.
Wind generation is high at the moment, contributing 13.64GW to the 34GW UK
total demand (it it 22:100 as I write).  Perhaps the high wind generation
level is the reason for the extended high frequency session.

Andy
www.g4jnt.com



<http://www.avg.com/email-signature?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=webmail>
Virus-free.
www.avg.com
<http://www.avg.com/email-signature?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=webmail>
<#DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2>

On Fri, 12 Feb 2021 at 21:38, Alex Pummer <alex at pcscons.com> wrote:

> at the time I grew up in Eastern Europe -- "communist time" -- they kept
> he clocks using the line frequency as reference -- by counting the
> periods during the day and week and for longer time for equal time
> interval the "provided" equal number of line frequency periods, as
> longer the time interval was as more precise was the time.  That way the
> clocks were relative accurate. They could do it since everything was
> "central governed".
>
> On 2/12/2021 9:24 AM, Lux, Jim wrote:
> > On 2/12/21 8:23 AM, Thomas D. Erb wrote:
> >> "I would think they try to hold it over 1 day, so that mains driven
> >>
> >> clocks don't run slow or fast.? That being said, I wonder how many
> >>
> >> clocks are still being built using a synchronous motor drive? Given that
> >>
> >> all the clocks on appliances in my kitchen have drifted apart, I'll bet
> >>
> >> they use their internal microcontroller crystal as a reference."
> >>
> >> Actually I think all of my kitchen appliances use line frequency for
> >> time reference - it's so easy to count.
> >
> >
> > Maybe.. you've got to condition the AC from the secondary side of the
> > transformer and use a pin to bring it in on, which requires at least 2
> > or 3 passive components, and you already have a crystal for the
> > microcontroller (thinking here of oven timers and the like, which have
> > a numeric display).  These applications are super price sensitive, and
> > those 2 or 3 components cost money, in components, in board space, and
> > in assembly costs. Pennies to be sure, but...
> >
> > And the fact that my appliances drift on the order of a minute in a
> > month, differently. So maybe some count cycles and some have a rock.
> >
> >
> >
> > _______________________________________________
> > time-nuts mailing list -- time-nuts at lists.febo.com
> > To unsubscribe, go to
> > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com
> > and follow the instructions there.
> >
> >
>
>
> _______________________________________________
> time-nuts mailing list -- time-nuts at lists.febo.com
> To unsubscribe, go to
> http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com
> and follow the instructions there.
>