); SAEximRunCond expanded to false Errors-To: [EMAIL PROTECTED] Tom Van Baak wrote: > The given specs are conservative (in typical HP style) but > I would guess the best ADEV numbers are only for laboratory > conditions. Someone from Agilent/Symmetricom might want > to comment on this. > > >> In the article "OBSERVATIONS ON STABILITY MEASUREMENTS >> OF COMMERCIAL ATOMIC CLOCKS", Pekka Eskelinen claims to >> have measured a phase temperature coefficient of 100ns/degree >> for commercial Cs clocks in 1999. >> > > I'll comment after I read it. But the 100ns/degree value doesn't > make sense because that's phase instead of frequency units. > > Did he mean 100 ns per day per degree? Or per 200 hours, > or 2000 hours, etc. If the latter, that represents a per-degree > frequency shift of 100 ns / 2000 h = 1.3e-14 which sounds > about right to me for a cesium tempco. It also depends on the > model: the tempco of a vintage hp 5060A or hp 5061A is likely > worse than a modern 5071A, for example. > Tom
Yes it can make sense. Place one Cs clock in a chamber where the ambient temperature can be adjusted to various fixed temperatures. Compare the phase of its 5/10MHz and/or PPS outputs with respect to those of another Cs standard held at constant temperature. The observed phase shift sequence may then be fitted to both frequency shift and a fixed (for a given temperature) phase shift components. Repeat for a range of temperatures and plot the (temperature dependent) fixed phase shift component as a function of temperature. Bruce _______________________________________________ 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.