4 ms·
PT100 thermistors are the usual reference standard once you move away from the triple point of water. It's been a few months since I last thought hard about ou
by ISL 10y ago
PT100 thermistors are the usual reference standard once you move away from the triple point of water.
It's been a few months since I last thought hard about ours (which we use in a different configuration), but 100 mK ought to be straightforward with a Protovoltaics RTD shield and a three or four-wire PT100 or PT1000.
Protovoltaics has a well-documented API and is quite responsive to detailed engineering questions.
Alternatively, one can calibrate a sensor against a trusted standard. Once that's complete, they tend to be fairly stable. LM35s and AD590s will have low-enough noise/good-enough stability for your spec once calibrated.
Before you embark on such a journey, be certain you actually want 100 mK absolute. It's possible to go through life happily without absolute calibrations in most cases.
- cstuder 10y agoThanks for the information. Im not familiar with the intricacies of temperature sensors. But since every home weather station measures in 100mK, I've assumed that that's the precision I should get out of an ordinary sensor. But you're right: I'm not entirey sure if I need this kind of precision.
- ISL 10y agoThere's an important difference between precision and accuracy. An LM35 will easily yield ~10 mK precision, but in absolute accuracy, they're far worse (the extent of the calibration error varies by model).