I'm designing a full Wheatstone bridge for measuring the bending strain in a steel bar. I have a circuit available to me that uses an ADS1232 to measure the output of the wheatstone bridge. When looking at loadcells online I see that they have 6 cables (sense + and sense-). From what I understand, these cables go to the excitation points of the wheatstone bridge and allow the circuit to measure the voltages, which cannot be done with the excitation cables themselves as they would have a voltage drop due to the much larger current draw. The sense cables do not draw much current as they are going into an opamp. Is this understanding correct?
I also don't understand why there are two resistors in series with the bridge. I've read online that they are for temperature compensation, but nothing goes into more detail then that.
If I was to attach strain gauges onto a steel beam, would I need those resistors? and where would they go, and with what value? Would I need anything apart from the 4 strain gauges in a full bridge configuration with sense cables going to the REF_P and REF_N terminals of the ADS1232 IC?