Hi, I made a Rigol HDO924S bandwidth measurement.
I used R&S SMB100A signal generator for source, and I calibrated with a R&S URV35.
I used 0 dBm @ 50ohm, that is
sqrt(50*10^0/1000)=224mVrms
sqrt(50*10^0/1000)*sqrt(2)*2=632mVpp
and I set the oscilloscope to 200mV/div.