[time-nuts] 5061B ADEV curves and questions

[AC0XU (Jim)]

The attached is a plot of some ensemble ADEV measurements of several 5061B cesium beam oscillators.

Two outlers are interesting to me, and I am wondering if anyone has ideas about them:

a) 5061B4U was the same unit as 5061B4, but it was obtained when I accidentally tested the unit with the cesium beam turned off. I expect that this curve (brown) is the behavior of the undisciplined OCXO. What I am wondering about is why the unit can't do better than it does up to 300 seconds with the cesium beam turned on. Actually, the same question applies to all of these units. Ideas?

b) 5061B6 is a unit that, according to all the various meter readings, is working fine. However, it is evident that it doesn't lock well. Any thoughts about this one?

Thanks-

Jim
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