Hi Peter,

Neither end of my resistor has a ground potential. So I grounded Pin 4 but the problem still exists. We tested all the external circuit and it's all good. The differential voltage between pin 2 and 3 is reasonable, just this device cannot read it correctly.

[quote="PeterF"] Hi, You say you have connected pins 2 & 3 but left pins 1 & 4 unconnected. That is your problem. You must have pin 4 connected to the same ground as your voltage source to give a reference to the voltage input pins. The measured voltage is the difference between the voltages at pins...

Hello, I have a PT 104 for voltage measurement. The voltage reading failed from early this week, the data shown by pico recorder is not the voltage across the Pin 2 and pin 3, which I measured using a multimeter. I connected wires V- and V+ to the to pin 2 and 3 separately, and left Pin 1 and 4 unco...

Hello, I just set up a PT 104. It's connected to a 4-wire RTD and a differential voltage measurement. My RTD is standard 0.835/C, calibrated and has 2 calibration coefficients a9 and b9. Where can I input these numbers in PT 104, for better accuracy? The voltage actually is for pressure measurement....