We're trying to use a Pico 1216 to record the compressive loads on a LCM STA-4 5000kg load cell.
We are exciting the load cell with a stable dedicated 10V supply, and normally the output voltage is reasonably linear, and yields the following (according to its calibration certificate):
0V = 0kg
-1.99mV = 500kg
-9.95mV = 2500kg
-19.91mV = 5000kg
But we get a lot of noise on the zero reading, and no matter how much load we place on the cell, we cannot get a reading to register.
We cannot find a setting to configure the Pico 1216 to accept or record negative voltage. Is it capable of this, or is there another trick we can use to spoof it?