This industrial amplifier is used for force transducers and here is the wiring diagram for the 6 wire transducers: ¨
And below is the terminals for the amplifier:
It seems 1 and 4 terminals are the output of the Wheatstone bridge to be amplified.
I'm kind of confused why there is two connection for the excitation voltage terminals of the bridge here. As you see 3 and 3' or 4 and 4' both are same points which are separately brought to the amplifier terminals. What could be the reason for 3' and 4'?