I have a cheap oscilloscope that is rated for 10V input. I want to measure the quality of the output of my power supply due to a belief the DC filtering circuit isnt working well and producing harmonics in the signal (ripples). The output voltage is at a higher voltage coming out of a switching mode power supply unit with output of 40V. As a quick and dirty solution, I was wondering how I measure it using my oscilloscope? I am thinking putting two resistive loads in series and then applying the DC load across them, and then measuring just one resistor. Say I make 1MOhm and 5MOhm in series, then I measure across the 1MOhm resistor using my 10V rated oscilloscope. Does this work? Any better suggestions? My primary concern is not damaging my oscilloscope or powersupply.