[time-nuts] Thunderbolt stability and ambient temperature

Tom Van Baak tvb at LeapSecond.com
Thu Jun 11 14:11:38 EDT 2009


> According to your theory, there should be differences in the schematics 
> of the oven controllers between the single and double oven variants of 
> the 10811.  Last year I picked up a couple of those double oven 10811s 
> from China that had the outer insulation removed.  I wonder if I could 
> see any anomalies in its operation with no outer insulation and only the 
> inner oven operating.

My understanding is that the unique "double" oven 10811
found in the Z3801A is not there for improved temperature
stability, but simply so that this first-generation GPSDO can
power up within spec in ultra cold (like minus 40) telecom
environments.

No other hp/Agilent instrument uses an external outer oven
around the 10811 as far as I know.

Does anyone on the list have access to a low temperature
test chamber? It would be interesting to see how slowly a
10544 or 10811 warms up from that cold environment as
compared to a more modern and compact E1938 or MTI
or TBolt-style OCXO.

/tvb






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