Hello i have a new HantekDSO5072 measuring voltages on an outboard motor ignition system of 330volts. If i am correct i should be using an 20/1 attenuator to protect the scope! But i can not see how to set up the scope for it.I am using a 100/1 probe and made the scope setting for that but how can i use the 20/1 attenuator and get proper readings?