Just for fun, I fired up some ancient equipment to see how it compares with the newer scopes (i.e. interesting to compare used equipment in the entry level price range).
The scope is an Agilent 54622D, fed 400mV of 10MHz square wave from an HP8012A pulse generator synced to a HP3325A for the frequency.
First, the square wave on its own. Is the overshoot due to the flanks of the pulses getting close to the scope's 3dB point (at 100MHz) ?
Close-up of the leading edge of the square.
Then, there is the FFT function.
How does this scope, with its modest 200M samples per second rate, get as high as 4GSamples per second for its FFT function??
Vertical is 10dBV/division, offset by -54dBV