I am using AMP04 for measuring thermocouple signals. The voltage supply provided is +9V (pin 7 to +9V, pin 4 to ground). In order to do offset adjustments I use a DAC (MCP4921) connected to pin 5 (REF pin). My enquiry is, do I measure the output voltage referenced to REF pin or ground? It is not clear for me from the datasheet info. At the attachment you may have a part of the whole circuit.
Thanks for your time and support.