You are right the student had move the amp clamp around on that second capture. What was strange was the large hump which has higher current. I was not sure why this was happening.

Thanks for your response.
Joe

I am checking to see if anyone can explain what I am seeing here. relative comp file 2 bad.jpg I am doing this as a demonstration for a class I was teaching and saw this.... Doing relative compression with a pico amp clamp (2000amp model with 200amp selected) I took a recording with all plugs in on ...