[time-nuts] Poor man's oven
Richard (Rick) Karlquist
richard at karlquist.com
Wed Jun 7 17:21:52 EDT 2017
On 6/7/2017 1:09 PM, Attila Kinali wrote:
> makes the PI loop better behaved. Also the thermal mass of the
> crystal holder is quite small. Especially compared ot the 10811.
Actually, the oven mass of the E1938A is much heavier than the
10811 and is made of copper to boot.
> Due to the flat puck design, I assume that the majority of the
> heat going to the crystal holder is due to radiation (unless I
> missed some insulation around the crystal). Radiation, albeit being
> a high "resistivity" transport mechanism, has very low inherent
> "capacitance". And thus the delay associated with this transport
> mechanism is low.
The crystal case is well connected to the oven mass and gets
heated by conduction. I don't think radiation is a player.
> There are probably a lot more small design decisions in the E1938
> that make it such a superb oven. More than I probably will ever
> be able to figure out. And, I still am astonished how well it works.
> Attila Kinalid
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