Ahhh,,,,working with thermocouples....FUN.

Here is a concise definition of cold junction compensation.

http://www.adac.com/applicati...ml

Look here for a pre-amp gain stage amplifier with cold junction compensaton.

http://hallbeng.jlab.org/datasheet...df

And here is some good reading material on the subject.

http://www.circuitcellar.com/library/d...sp

Have Fun ... You will learn a lot
Mike Karas