skip@rafos.UUCP (Skip Carter) (05/31/90)
In article <1990May19.003327.12503@agate.berkeley.edu>, aephraim@typhoon.Berkeley.EDU (Aephraim M. Steinberg) writes: > ...... However, there are chips (AD590, perhaps?) put > out by Analog Devices, which give a current they claim to be absolutely > proportional to the temperature in Kelvins, accurate to 2 or 5%, depending > on how much you pay. Also depending on how accurate your 5V supply is, > .... > If anyone knows any more about these chips or relatives of theirs, I'd be > interested to hear about it. > We have looked at these chips for in situ temperature measurements in the deep ocean. They don't seem to be as precise or as stable as a good thermistor, so we went back to using thermistors. (Some labs I know of buy thermistors a year in advance and keep them on a shelf for a year -- they claim vastly improved stability when they do this). By STABILITY, I mean that I always get the same measurement for the same temperature (Its far more important for ocean measurements to get 17.15 everytime I measure 17.3 degree water, than it is to get closer to 17.3) -- Skip Carter UUCP: uunet!rafos!skip School of Oceanography INTERNET: skip@rafos.gso.uri.edu University of Rhode Island Phone: 401-792-6519 Narragansett, RI 02882