[time-nuts] Recommendations for Mains Power Monitor/Logger
Who made that one? I have three power station master clocks. http://electricclock.omeka.net/items/browse?tags=Power+Station+Master+Clock [electrictime] Thomas D. Erb o: 508-359-9684 p: 508-359-4396 x 1700 f: 508-359-4482 a: 97 West Street, Medfield, MA 02052 USA e: t...@electrictime.com<mailto:t...@electrictime.com> w: www.electrictime.com<http://www.electrictime.com/> [https://s3.amazonaws.com/htmlsig-assets/square/facebook.png]<https://www.facebook.com/pages/Electric-Time-Company-Inc/127918073950854?ref=hl> [https://s3.amazonaws.com/htmlsig-assets/square/twitter.png] <https://twitter.com/tower_clocks> [https://s3.amazonaws.com/htmlsig-assets/square/pinterest.png] <https://www.pinterest.com/electrictime/> ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
[time-nuts] Why European Clocks are Running Slow, and British Clocks Aren't
You tube video about line frequency time keeping issues in the EU. https://www.youtube.com/watch?v=bij-JjzCa7o [electrictime] Thomas D. Erb o: 508-359-9684 p: 508-359-4396 x 1700 f: 508-359-4482 a: 97 West Street, Medfield, MA 02052 USA e: t...@electrictime.com<mailto:t...@electrictime.com> w: www.electrictime.com<http://www.electrictime.com/> [https://s3.amazonaws.com/htmlsig-assets/square/facebook.png]<https://www.facebook.com/pages/Electric-Time-Company-Inc/127918073950854?ref=hl> [https://s3.amazonaws.com/htmlsig-assets/square/twitter.png] <https://twitter.com/tower_clocks> [https://s3.amazonaws.com/htmlsig-assets/square/pinterest.png] <https://www.pinterest.com/electrictime/> ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Recommendations for Mains Power Monitor / Logger (
Year ago we used to sell a quartz clock and a 60hz clock mounted on a panel for generator stations on small islands in the Caribbean. This is the way it was done in the 1930's http://electricclock.omeka.net/items/show/6 [https://htmlsigs.s3.amazonaws.com/banners/files/000/040/535/medium/ET-logo3.jpg] Thomas D. Erb o: 508-359-9684 p: 508-359-4396 x 117 f: 508-359-4482 a: 97 West Street, Medfield, MA 02052 USA e: t...@electrictime.com<mailto:t...@electrictime.com> w: www.electrictime.com<http://www.electrictime.com> [https://s3.amazonaws.com/htmlsig-assets/square/facebook.png]<https://www.facebook.com/pages/Electric-Time-Company-Inc/127918073950854?ref=hl> [https://s3.amazonaws.com/htmlsig-assets/square/twitter.png] <https://twitter.com/tower_clocks> [https://s3.amazonaws.com/htmlsig-assets/square/pinterest.png] <https://www.pinterest.com/electrictime/> ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
[time-nuts] Line Frequeny Stablity
I actually have a 1930's unit in my clock collection - and in the 1980's we used to make an AC power clock in a panel next to a quartz clock for small island frequency control. This is a link to my master clock http://electricclock.omeka.net/items/show/6 I'm just wondering how is it set now ? ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Line Frequeny Stablity
Thanks for the info. So that tells me how data is recorded - but not how the frequency is kept stable ? Is the line frequency now directly tied to GPS clock - with no drift ? Thomas D. Erb t...@electrictime.com<mailto:t...@electrictime.com> / Electric Time Company, Inc. Office: 508-359-4396 x 117 / Fax: 508-359-4482 97 West Street Medfield, MA 02052 USA www.electrictime.com<http://www.electrictime.com> [Facebook]<https://www.facebook.com/pages/Electric-Time-Company-Inc/127918073950854?ref=hl>[Twitter]<https://twitter.com/tower_clocks>[pinterest]<https://www.pinterest.com/electrictime/> [htmlsig.com]<http://www.electrictime.com/> ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
[time-nuts] Line Frequeny Stablity
I was wondering if anyone knew how the US power grids control their line frequency with respect to time ? There seems to be four separate grids - Eastern, Texas, Western and Quebec - but I have no idea how they get their time. Thomas D. Erb t...@electrictime.com<mailto:t...@electrictime.com> / Electric Time Company, Inc. Office: 508-359-4396 x 117 / Fax: 508-359-4482 97 West Street Medfield, MA 02052 USA www.electrictime.com<http://www.electrictime.com> [Facebook]<https://www.facebook.com/pages/Electric-Time-Company-Inc/127918073950854?ref=hl>[Twitter]<https://twitter.com/tower_clocks>[pinterest]<https://www.pinterest.com/electrictime/> [htmlsig.com]<http://www.electrictime.com/> ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Smart Phone time display accuracy...? (shouldbe q931)
I believe some of the cell phone protocols actually provide time to the phone as part of the authentication process. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
[time-nuts] Line Frequency standard change - Possible ?
I was wondering if anyone was familiar with this proposal, is this a uncoupling of line frequency from a time standard ? The purpose of proposed Reliability Standard PRC-012-2 is to ensure that remedial action schemes do not introduce unintentional or unacceptable reliability risks to the bulk electric system. https://www.ferc.gov/whats-new/comm-meet/2017/011917/E-13.pdf Thomas D. Erb t...@electrictime.com<mailto:t...@electrictime.com> / Electric Time Company, Inc. Office: 508-359-4396 x 117 / Fax: 508-359-4482 97 West Street Medfield, MA 02052 USA www.electrictime.com<http://www.electrictime.com> [Facebook]<https://www.facebook.com/pages/Electric-Time-Company-Inc/127918073950854?ref=hl>[Twitter]<https://twitter.com/tower_clocks>[pinterest]<https://www.pinterest.com/electrictime/> [htmlsig.com]<http://www.electrictime.com/> ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] AC line distortion
Maybe a capacitive load in your facility ? Whenever I've looked at it - it's always been pretty clean. For years we used the AC mains for time keeping - but have found in some locations - especially ones with lots of dimmers - zero crossing counting was ineffective. My feeling was that dimmers that chopped the ac wave form in the middle sent out a large amount of noise over a wide spectrum. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] GPS message jitter (preliminary results)
Here is an interesting discussion of Kalman filtering. http://math.stackexchange.com/questions/173901/why-use-a-kalman-filter-instead-of-keeping-a-running-average Thomas D. Erb t...@electrictime.com<mailto:t...@electrictime.com> / Electric Time Company, Inc. Office: 508-359-4396 x 117 / Fax: 508-359-4482 97 West Street Medfield, MA 02052 USA www.electrictime.com<http://www.electrictime.com> [Facebook]<https://www.facebook.com/pages/Electric-Time-Company-Inc/127918073950854?ref=hl>[Twitter]<https://twitter.com/tower_clocks>[pinterest]<https://www.pinterest.com/electrictime/> [htmlsig.com]<http://www.electrictime.com/> ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
[time-nuts] Mains Frequency Monitor with the PIC 16F1619 (Daniel Watson)
Line frequency in the USA is actually very accurate over the long term - not with respect to atomic clocks - but the power companies do correct the line frequency. In the suburb of Boston where we are located - you never have to correct an electrical clock between the daylight saving time changes. This of course assumes you haven't lost power - due to major snow storms etc If anyone is interested - this is a 1920's version of a line frequency monitor used in a power station - with a pendulum clock as the time standard. http://electricclock.omeka.net/items/show/6 Thomas D. Erb t...@electrictime.com<mailto:t...@electrictime.com> / Electric Time Company, Inc. Office: 508-359-4396 x 117 / Fax: 508-359-4482 97 West Street Medfield, MA 02052 USA www.electrictime.com<http://www.electrictime.com> [Facebook]<https://www.facebook.com/pages/Electric-Time-Company-Inc/127918073950854?ref=hl>[Twitter]<https://twitter.com/tower_clocks>[pinterest]<https://www.pinterest.com/electrictime/> [htmlsig.com]<http://www.electrictime.com/> ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
[time-nuts] 1937 Time Standard
I was wondering if anyone knew what the "state of the art" time standard was in the 1937 ? ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
