I simulated the problem by adding two traces, one on the calibration signal and the other touching my finger. It is really strange that your tops and bottoms are fuzzy. Have you tried looking at any other signals? I'm having a hard time trying to think of something for you to look at other than the calibrator.
Almost any digital electronic device will have some nice square waveforms for you to play with. Make sure you have the ground lead from either the scope itself or the prob attached to the power common on whatever you look at. (Hopefully battery powered)
One other thought...... Is there an internal or external astigmatism control on your scope? I assume you have downloaded the manual mentioned earlier. Astigmatism will cause a fuzzy appearance but on the entire waveform. Since the transitions on the cal signal are so fast, it may not show up.
Almost any digital electronic device will have some nice square waveforms for you to play with. Make sure you have the ground lead from either the scope itself or the prob attached to the power common on whatever you look at. (Hopefully battery powered)
One other thought...... Is there an internal or external astigmatism control on your scope? I assume you have downloaded the manual mentioned earlier. Astigmatism will cause a fuzzy appearance but on the entire waveform. Since the transitions on the cal signal are so fast, it may not show up.