[EMAIL PROTECTED] wrote: > Hi Tom, > > BTW: the retrace hysterisis of typical very high-quality OCXO's is speced at > 1E-08 (24 hours off, 2 hours on) that's probably a lot worse than the voltage > reference zener retrace will be. > > A typical 20ppm Hysterisis on a 5V Zener with the OCXO having a +-22Hz > (0-5V) adjustment range gives 4.4E-011 retrace. Several orders of magnitude > better > than these particular OCXO's inherent retrace by itself. > > bye, > Said > Said
If an unheated reference exposed to wide ambient temperature swings is used then hysteresis may be significant when the OCXO is continuously powered. The significance and magnitude of the effect depends on the range of ambient temperature variations experienced. Bruce _______________________________________________ time-nuts mailing list time-nuts@febo.com https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
