New to me (second hand) Oscilloscope Rigol 1052E not making sense ?

Hello everyone,

I am starting to use a Rigol 1052E (I have not used a scope for 30 years or so, so am going up the learning curve).

It all sort of makes sense with the exception of measurement values if I take a Power supply (AC at 15V) with a 10x set probe it measures 4.28V P to P

On all the measurements I attempt it seems to be 3.5 times lower than expected.

I have run the self calibration software and it made no difference, any ideas?

Thanks, Rich
 
Ok - thanks guys

It is all making more sense to me now and yeah, RMS > Peak > Pk2Pk is what I forgot completely about!

I am making a power supply, and wanted to get used to the scope before I make sense of the measurements.
all good learning!

Rich