I have an old Hameg HM 605 60Mhz ocillascope, I was hoping to measure some DC power supply noise or ripple of these power supplys. I've had this scope for a long time, but hadn't got round to using it yet. I have noticed when I centre the trace, it looks short on the graticule scale by about 2mm and each end of the trace. When I use the probe to look at the built in wave form, it looks like it does go completely to each end of the graticule scale. I'm an absolute newbie to using ocillascopes. I only know what I've gleened from you tube and books. So my question is, does this trace look short on each end once I've centered it ? It only looks like this when the refresh rate is fast, if I slow it down, the trace looks like it starts and ends accurately from end to end. Any help appreciated, and thanks for reading.