Part Number:PGA300
According to the data sheet he maximum current the PGA300 is able to deliver to the strain gauge sensor is 1.5mA.
This limit the minimum strain gauge output impadance to 800Ohm in case of power supply of 1.5V and 1700Ohm in case of power supply of 2.5V.
We normally use 500Ohm or 350Ohm strain gauges.
There is any trick I can adopt to use the PGA300?