i need to measure a sample temperature and the relative temperature using 2 thermocouples and two ad849.
the way i connect the thermocouples is as follow :
in the sample measurement it quite stait ahead the - of the thermocouple goes to - of the amp and the + of thermocouple goes to + input of the amp.
in relative measurement the + of the first thermocouple is shorted to the + of second themocouple so the - input of thermocouple A goes to - of the second amp and the - of thermocouple B goes to + input of second amp. in case that both themocouples are in same temperature i should have the absolute temperature in first amp and 0 or almost 0 in second amp.
what i got is that the absolute is wrong and the relative temperature has great errors
what should i do?