Hey All, I am trying to recontruct an experiment for measuring a hysteresis loop in a Sawyer-Tower Circuit. It is a simple experiment and I attached a pdf of an undergrad lab for it. My question is what are the connections to the Oscilloscope. In the picture you have channel 2 and channel 1 connected to segements within the circuit, but what is the final connection to after the linear capacitor? It appears to be going to the scope, but is it a ground or something? I am refering to figure 10 in the attached experiment. Following the linear capacitor there is a red line connected to the scope but I am not sure what is connected to on the scope. There is also a black line across from it that is the ground to the function generator. Thanks for any help, and also excuse my misunderstanding/mistating of anything. I am not an EE.