I've been using a 2 channel scope for low frequency work and have always grounding only one probe clip to the circuit under test. Now that I'm working with 1Mhz and greater circuits when I do that i get a lot of ringing in the second channel. Do I ground both oscilloscope ground clips to the circuit under test? I don't want to create a ground loop. I understand I would ground both clips to he same point. I've search a lot of material about probe grounding but do not find anything on using 2 channels and grounding.
Pete
Pete