i had the same problem as yours,dave.,
I had a problem with reading the input ADC, I made the DAQ using a thermocouple to read the temperature in the furnace, the problem I faced was reading the input ADC unstable from the thermocouple, the output voltage of thermocouple 10mv/deg. C, should be reading the input ADC linearly with increasing temperature, but that happens readings are volatile and unstable.
what should i do?using fillter?what fillter?
regard,nugrozt