Hi, I’m Joaquim and I live in Portugal.
I’m a very basic new user 
I’ve been looking around all the info available, I’ve calibrated probe and I’ve followed calibration procedure explained in the manual. However, while ChA menu 2 Vpp reports 0.000mV default, ChB Vpp shows 0.220V no tension applied, so all ChB mesurements become wrong. Any one knows a way to correct this?
Thank you in advance for your help.