If it is used for tempco it should affect the temp by stabilizing offset with temp changes correct? Maybe a more correct approach would be to disconnect it and test. Has been awhile since I read that testing stuff.
Doc Sent from mobile On Dec 11, 2012, at 6:39 AM, "Charles P. Steinmetz" <charles_steinm...@lavabit.com> wrote: > Bill wrote: > >> Well, perhaps you are not looking close enough. That is you need to be >> observing >> at a finer level of comparison. The changes, observed here and at another >> location, are in parts in 10-10 to 10-11 range, sometimes larger. At one of >> the >> locations there was a direct correlation to the air conditioning cycle. > > It is not clear what part of my message you are referring to. > > My main point was that the information from the DS1620 temperature sensor > does not appear to be used internally by the Tbolt. In my observation, > subjecting the sensor alone (thermally isolated from the rest of the Tbolt) > to wide temperature swings (-10 to +120 C) did not produce any observabe > effect on the operation of the Tbolt. If the temp sensor data were used > internally by the Tbolt, one would expect a significant effect from such a > wide swing -- one that couldn't be missed. If that large and fast a reported > temperature swing produced effects only at the e-10 or 11 level, I would > attribute it to imperfect thermal isolation of the Tbolt from the temperature > stimulus (i.e., stimulus affecting the oven temperature or EFC circuitry of > the Tbolt), not as the Tbolt's response to the temperature change reported by > the DS1620 sensor. > > If you were referring to my side point -- that allowing slow changes to the > Tbolt housing temperature does not appear to be materially different from > regulating the housing temperature -- my observations were that this was true > down to at least 5e-13. Of course, there are two variables -- total swing > and rate of change. By "slow," I mean a rate of change of 0.25C per hour or > less [DS1620 reported temperature]. My diurnal swings are no more than 2C > per day and usually less [DS1620 reported temperature] (they can be as much > as 5 or 6C seasonally, but those changes happen over weeks). A/C cycling > likely subjects the Tbolt to a significantly greater rate of change than what > I mean by "slow," even if basic precautions are taken (e.g., putting it in a > cardboard box). > > Best regards, > > Charles > > > > > > > > > > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
