1. I was measuring voltage of thermopile with Fluke multimeter 15B+. Attached is my circuit. Its party incomplete shown but in actual its complete in hardware.
2. When I measure voltage by only thermopile in hand and not noumted on board, only connect probes of multimeter, I can measure voltage as per its mV vs Celsius graph.
3. When I connect it to board, and don't give 3.3V supply to board and connect probes across J1 connector, then also correct voltage read.
4.But when I give 3.3V to circuit, and connect probes across J1 connector, ideally it should be the same, because I am still measuring across the thermopile only,
but its very off than actual values, which I was reading without giving power. Why is that so?
5. is it high values 1M resistor connected across? But still y probes are connected across thermopile NO?
Earlier when I was reading 10mV, not I am reading around 200mV.