[time-nuts] Cs stability

M. Warner Losh imp at bsdimp.com
Tue Jul 17 09:58:08 EDT 2007

In message: <004b01c7c845$cb81d290$0300a8c0 at pc52>
            "Tom Van Baak" <tvb at LeapSecond.com> writes:
: ); SAEximRunCond expanded to false
: Errors-To: time-nuts-bounces+imp=bsdimp.com+imp=bsdimp.com at febo.com
: > OF COMMERCIAL ATOMIC CLOCKS", Pekka Eskelinen claims to
: > have measured a phase temperature coefficient of 100ns/degree
: > for commercial Cs clocks in 1999.
: Something is wrong with that claim. There's no way a modern
: cesium standard exhibits a phase shift of 100 ns for a one
: degree change in ambient temperature. I have Cs standards
: that often change in temperature by several degrees and still
: keep to nanoseconds. I guess I need to decode that paper
: and see what's wrong. Does anyone have contact with the
: authors (Finland)?

We have HP5071A's that keep to about 5ns over the course of a typical
heading/cooling cycle measured relative to GPS.  This is over a range
of maybe 15C in the summer...


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