I've got a project where we need to watch a pulse on another piece of equipment. We do not want to load the circuit in the other piece of equipment. Running a piece of coax to my equipment results in considerable ringing, since the coax is not terminated. So, the question comes up, how does a scope probe get away with a 1M load in the scope? I doubt that's terminating the coax with its characteristic impedance. The idea of a 10X probe with compensation is pretty clear... the trick is how do they deal with the lack of termination? Ideas? THANKS! Harold -- FCC Rules Updated Daily at http://www.hallikainen.com -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist