Hi, have some experance by designing thermocouple using the xtr112?
recently I am confused by the CJC(cold junction compensation), according to the datasheet I should use a diode(LL4148), a 1k Ohm and a 25 Ohm resistor to compensate the cold junction, but according to my measurement the cold junction was far not enough compensated. So I measured the forward voltage over the diode, there was only about 0.2V, according to the datesheet of LL4148 the forward current through the diode was about only 1uA.
According to the datasheet xtr101 these two resistors are 2k Ohm and 51 Ohm, but in compare of the xtr112 the xtr101 has a much greater current stimulation(1mA), does it means the 1k Ohm and the 25 Ohm also needs to be changed to resistors with much greater values so that the voltage over the diode can reach 0.6V?
right now I am confused by this CJC problem, can anyone help me?