----- Original Message ----- From: Snail Instruments To: Sent: Sunday, October 22, 2000 8:39 AM Subject: Re: [OT]: Thermocouples > Unless you are obsessive about cold junction compensation and > linearization, you could get along with an ordinary OA as well. I'm not sure exactly how much error the lack of cjc will introduce. Id like to have, say, 10 degree f accuracy over room temp to 1500 degrees f. Is this within the realm of possibility with a standard op amp? Also, even if I use thermocouple wire and the connectors, I still technically have another thermocouple junction wherever the metal in the conductor changes types, isn't that correct? So using a "thermocouple connector" still leaves me with a junction that will introduce error. Is that correct? So, the object is to use the unavoidable second junction as a compensation for the actual measurement thermocouple. Is _that_ correct? Mark Mark -- http://www.piclist.com hint: To leave the PICList mailto:piclist-unsubscribe-request@mitvma.mit.edu