[time-nuts] Voltage Standards

[Brooke Clarke]

Hi:

Geller's patent 7382179 Voltage reference with enhanced stability explains how 
he combines the AD587 voltage reference with the LM399 voltage reference to 
obtain improved temperature stability.  The method can be used with the LT1000.
http://www.google.com/patents?id=v0GqAAAAEBAJ&dq=7382179

7380471 Micro gust thermal anemometer is a similar circuit by Geller where the 
LM399 is installed on the PCB using the untrimmed leads so that it's up in the 
air.  Any wind changes it's temperature which is seen as an output.
http://www.google.com/patents?id=GDuqAAAAEBAJ&dq=7380471

I found a drawing on the National Semi web site for a Valox plastic shield for 
the LM199, but there's not any other info about it or the specified material.
http://www.national.com/packaging/mkt/h04d.pdf

Brooke Clarke
http://www.prc68.com