I'm using a LM318N in the below configuration with a Force Sensing Resistor
My output voltages with various RMs are as follows,
5K 1.3 to 3.1
10K 1.3 to 3.5
47K 1.3 to 3.6
100K 1.3 to 3.4
I do not understand why I get a minimum of 1.3V to start with all RMs
Secondly the range and top pressure readings are all about the same not varying as per the FSR data sheet
Is this a function of the op amp and will I get a different result with say an LM358 or a LM324 ?