27-11-2022, 07:57 PM
Amazon and eBay have inexpensive switched 1:1 & 10:1 100 MHz probes with frequency trimmer cap at the probe end. Feed a squarewave and tweak it flat & square. They do work OK on my 100 MHz digital scope (whatever GHz samples), Hameg 203 and Rigol 1.5 GHz magic box.







