I am planning to measure an RS485 signal with an oscilloscope. Since I want to see the signal that is "seen" by the receiver side, I was planning to plug the reference terminal of probe to Sig(-), and the measurement terminal to Sig(+).
However, I saw in many places that a differential probe should be used for measuring differential signals, and I couldn't understand the reason.
What is the reason? Why does a differential probe exist after all, since all measurements in electronics are inherently differential?