I'm using the pico pt-104 in order to mesure a temperature.
I have a type T thermocouple which is connected to an amplification circuit.
This circuit is made of a RC low pass filter, and then a AD595CQ which gives a 10 mV/Â°C output.
This output is connected to the pt104.
This is not me who have made these connections, and I have a few question about that.
First, V+(pin 2) is connected to the positive voltage of the AD595, V-(pin3) to the negative, and V- is connected to ground(pin4) via a 100kohm resistor. Is this the good way?
I use the software given with the pt104 to watch the voltage. This voltage seems quite correct, but when I unplug the pins, I still have the same voltage. Is it normal? Why don't I have then 0V (or nearly?)
The pt104 is also used to mesure a thermal flux via a thermal flux sensor. In this montage, there is no resistor between V- and ground, theses 2 pins are just connected. Why this difference?
Thanks a lot for the answers, and sorry for my english