[time-nuts] 60hz disciplined watch follow up

David VanHorn D.VanHorn at elec-solutions.com
Thu Apr 21 18:58:38 UTC 2011


My orignal post that 60hz light flicker received at citizen ecodrive solarcells is used to
 discipline the watchs rate, needs a little correction to my post as brought to my attention by the replies.
Yes it is actually 120hz flicker 60 positive cycle flickers and 60 negative cycle flickers per
second thus 120 flickers per second.


Further complicate this with larger buildings getting their power from three-phase, and that in a given room, you may have lights on two or more of those phases.

Seems rather doubtful that they are using this method.

Test: Put the watch in a box lit by an incandescent or LED light driven from a regulated power supply.
Observe.

Test: Put the watch in a box lit by an LED source at 61 Hz or 122Hz.
Observe.


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