experiment No1, I connected the thermopile V+ and V- to Agilent RMS multimeter respectively. The Resistors(aka heaters) of the sensor connected to Due digital Pins. When giving small amounts of voltage to heaters the multimeters measured feedback from thermopile. I measured several 0,01 -1,3 mvolts depending on the heater voltage.
experiment No2. I connected the Thermopile V+ to a Due analog pin and V-to Due GND. Using analog Read in function i tried to read the same reading as multimeter did. Guess what? while giving same amount of voltage to heaters the Thermopile feedback was still 0.0000, till the point where i have increased the heaters voltage with some 2%. Then I saw that data in serial, but it was too unstable, like 5.000 , then it gets 0.0000, then again , 3.000, unstable readings. Anyway, I decided to convert those ranalog readings to milivolts, to compare them with multimeter readings, so I did the following:
Tp(V)= analog reading * (3.3/4095); to get Tp in Volts??? but the reading does not coinside with multimeter value, its to low. Am i doing something wrong here?
at the moment i have ambient temperature, c.a.25°C, but for future its gonna be something -30 up to +300°C range