Hi: Thanks for the information. I an considering what to do. Ron -----Original Message----- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of David Sent: Tuesday, August 14, 2012 3:02 PM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] Early WWV Oscillator
Switched bridge or sensor excitation is an old technique used to gain greater sensitivity for a given power without undue power dissipation in the sensor itself. The later can be important to prevent self heating in a temperature sensor. I suspect you could get most if not all of the benefit by using a lock-in amplifier which relies on synchronous demodulation to lower the noise level. Linear Technology application note 43 page 24 shows a good example. There are also several switched bridge examples in the same application note. http://cds.linear.com/docs/Application%20Note/an43f.pdf On Tue, 14 Aug 2012 13:42:49 -0700, "Ron Ward" <n6idl...@comcast.net> wrote: >HI Robert: >WOW! Thanks. >I need to build a double oven for my thunderbolt and set it to about 50 >Degrees C. > >I am really just trying to reduce the 24 hour temperature range. > >I am looking at an application note from National Semiconductor, AN 266, >for a precision oven. It claims .001 degree C! > >The internal oven for the Trimble Oscillator is most likely not as good >as the one featured in the application note. > >Any ideas? > >Thanks again, >Ron > >-----Original Message----- >From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On >Behalf Of Robert Atkinson >Sent: Tuesday, August 14, 2012 1:21 PM >To: Time Nuts >Subject: [time-nuts] Early WWV Oscillator > >Came across this when browsing > >\http://nistdigitalarchives.contentdm.oclc.org/cdm/singleitem/collection >/p16009coll3/id/34 > >Robert G8RPI. _______________________________________________ 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.
