0.05C? 0.5 is hard already. 0.05/40, that means 0.1% accuracy in T! What to calibrate? 3 phase water in 1 atm? to hard. ----- Original Message ----- From: "Forrest W Christian" To: "Microcontroller discussion list - Public." Sent: Tuesday, December 23, 2008 5:48 PM Subject: [EE] Inexpensive but accurate temperature reference > I am starting to have the need to make reasonably accurate temperature > readings, most typically of ambient air... and typically in the range > of -40C to +60C, but of course larger is better. I'd like to have at > least 0.05*C accuracy, but again, of course finer is better. > > I have a high-resolution voltmeter I send off to get calibrated every > year or so to be able to do similar voltage measurements, along with a > voltage reference to verify it's calibration. I'm looking for > something similar for temperature (the meter, not the reference, since > they are really expensive (and no, boiling/frozen water isn't an > accurate enough temperature source, especially on the boiling side)). > > -forrest > > > -- > http://www.piclist.com PIC/SX FAQ & list archive > View/change your membership options at > http://mailman.mit.edu/mailman/listinfo/piclist __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist