Fascinating. 1. Does anyone know if they have different models for 50 and 60 Hz regions (or is the internal software smart enough to differentiate)?
2. Any else think this is a questionable approach for a watch that is heavily advertised (at least around here) as being great for the boating set? If they have lights, they are usually DC...imagine being on a nice long distance yacht voyage, and your watch (highly accurate at home) just gets worse and worse as the days go on. 3. Based on the industrial frequency meter I have on our power line here in RI (US), the absolute frequency never varies more than +/- 0.04 Hz, and my Heathkit clock (uses the power line for timekeeping) never varies more than 4 seconds from the GPS based clock sitting next to it. On a trip to Scotland, using the same meter, I observed variations as large as +/- 0.1 Hz (not a typo, from 49.90 to 50.10 Hz). FWIW Tom Frank, KA2CDK On Apr 20, 2011, at 9:43 AM, tom jones wrote: > Most if not all Citizen ecodrive watches are disciplined by 60hz light > flicker that average > the 60hz light flicker over approximately 10 days before a rate adjustment is > preformed. > > I have four citizen ecodrives; > > Plain jane quartz analogue ecodrive with mechanical calendar that is 60hz > disciplined. > > Stainless steel skyhawk ecodrive ana-digital that is 60hz disciplined. I've > monitored this one > for over a week it was holding 13 miliseconds for over a weeks duration (off > the wrist mode) compaired to my cesium and ribidium references and got > distracted from futher measurements of this citizen skyhawk as I was consumed > with other measurements and comparisons between loran gps cesium ribidium and > other watches. > > Blue angles citizen skyhawk ana-digital that half the time seems to be 60hz > disciplined and other times unsure. > This blue angles citizen skyhawk has the same movement as the stainless steel > skyhawk which is definately 60hz disciplined. > I suspect this blue angles skyhawk that I purchased out of the country could > have 50hz and 60hz dicipline modes? > > My fourth citizen ecodrive is the stars & stripes forever yacht timer > ana-digital which is 60hz diciplined. > This watch reboots every feb 28th at midnight to utc time zones and jan 1 > 2004 (not sure of the exact year is crashes to) some kind of leap year bug! > > Only unexpected temperature changes experienced by the ecodrive citizen > watches produce significant error > (.5 to 1 second over several days of temperature varation) there rate will > correct after an approximate 10 day time constant. > > Many wrist watch forums make reference to citizen ecodrive rate accuratces > remarking that citizen uses some propriatary rate techniques. It's simply > 60hz light flicker received at the ecodrives solarbattery/photocell. > > I would recomend when setting your citizen ecodrive watches to set them 2.5 > to 3 seconds fast if worn continous because that is approximately how much > time will be lost before its rate gets compensated the first time. > > A Great Day to All , Tom > > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
