From W2AEW, some good back to basics on using a CRO.
How to make a peak to peak voltage measurement on a scope
Video: Peak to peak voltage measurement on a CRO
Re: Video: Peak to peak voltage measurement on a CRO
Brilliant! I learnt something: that my Tektronix TAS465 can autosense when I'm using a 10x probe - although my current probes don't support that.