Mechanical chonometers are still rated and the offset applied. This was probably the earliest application of the offset with respect to the time standards of the day. I.e. Greenwich and USNO among others.
Content by Scott Typos by Siri On Jan 12, 2019, at 5:15 PM, Jim Harman <[email protected]> wrote: I don't have modern knowledge of this, but traditionally marine chronometers were not adjusted for precise timekeeping, but rather would be "rated" for how much they would gain or lose per day and that correction would be applied at the time of the astronomical observation. Do you have an opportunity to post-process your data, i.e. record the offset of your standard periodically so that you can interpolate the results? That would probably make the requirements a lot less demanding. > On Sat, Jan 12, 2019 at 4:28 PM Joe Hobart <[email protected]> wrote: > > Here is more explanation: > > I need a stand-alone, easily portable unit with display; the unit may be > used > where GPS, cell phone, or WWVB are not available. Low power consumption is > highly desirable. > > I have seen advertisements of marine quartz chronometers listing an > accuracy as > good as <0.01 second/day at a constant temperature of 22 C. Has anyone had > experience with a marine quartz chronometers? If so, how much did the > accuracy > vary with temperature? > > > Thanks for the suggestions about pickup coils; I had hoped a coil would > detect > the clock movement well enough to compare to a standard 1 PPS. I have a > Motorola GPS timing module and a storage oscilloscope for comparison. > > Joe > > --- > This email has been checked for viruses by AVG. > https://www.avg.com > > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > and follow the instructions there. > -- --Jim Harman _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
