[time-nuts] 60hz disciplined watch
jmfranke
jmfranke at cox.net
Wed Apr 20 14:10:39 UTC 2011
Do they detect the light flicker or the ambient ac field. Light flicker is
120 Hz.
Very interesting,
John WA4WDL
--------------------------------------------------
From: "tom jones" <epoch_time at yahoo.com>
Sent: Wednesday, April 20, 2011 9:43 AM
To: <time-nuts at febo.com>
Subject: [time-nuts] 60hz disciplined watch
> 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
>
>
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