Calibration Curve for the pressure sensors

I was wondering how we are supposed to account for the weight platter in the pressure calibration curve.

Should we add the weight of the weight platter to all of our measurement weights? Or is there some other way of accounting for it?

This is a good question that a few people already brought up in lab. So obviously your 'zero lb.' point doesn't have a pressure measurement of zero, because there is some weight associated with that loading platter that puts a force on the device and creates a non-zero pressure. This is ok...remember you are just trying to get a calibration curve, so think about what is going to go on the abscissa (x-axis) of the plot and what is going to go on the y-axis. The left corner of your plot does not necessarily have to start at 0,0 and in fact it won't, because your 'zero point' is at 0 lb. and whatever you measured for the unloaded pressure.