I would suggest that you get some signal conditioning to bring the signal level of the T/C up to a larger value before trying to measure it with the DAC 700. According to the manual, it's lowest (most sensitive range) is +/- 2.5 volts. The total number of counts in the ADC are diveded over this input range. If you feed the input with a T/C signal (usually less than 100 mv., then you will get very lousy temperature readout resolution. This will go a long way towards producing the temperature ambiguity you are experiencing.
Hope this helps somewhat. Dave
