Mark Sims wrote: > I doubt the temperature sensor is just used for environmental monitoring. If > it was, they would most likely have just used the basic 0.5C resolution > reading and have been done with it. Instead, they do the high res read > routine and then feed that into a filter to get very smooth high resolution > (microdegree scale) values. > > The whole purpose of a GPSDO with an expensive double oven OCXO is to provide > extremely high quality holdover performance when GPS signals go away. To > achieve this level of performance one needs to compensate for the affects of > temperature on the parts of the system outside the oven. 0.5C resolution is > not up to the task of maintaining parts per trillion accuracy. There does > not appear to be any other temperature sensor in the Tbolt. > > > > ------------ > Isn't it likely that a temperature sensor adjacent to the RS232 connector is > just going to monitor unit temperature for environmental purposes, perhaps, > for example, to give the option for flagging up an overheating situation, in > which case surely 0.5C resolution is more than adequate and the "clunkiness" > isn't really an issue? > Mark
Unless there is sufficient noise or dither merely filtering/averaging a large number of temperature readings will not increase the resolution to below 1lsb. Either internal noise or temperature fluctuations with an amplitude of at least 1 lsb or so are necessary. Bruce _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
