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That type distinction is only applicable to analog oscilloscopes.
There is no such difference for digital oscilloscopes, but some have 2 different modes which is similar:
"real-time": All digital oscilloscopes can do this. Only a single pulse/event/cycle of the input signal is needed.
"sampling": By measuring over several pulses/events/cycles on the input signal, and changing the sample position (interleaving), a more detailed measurement can be made. The bandwidth of the measured signal can be higher than what the oscilloscope's sample rate normally would allow.
For many cheap new oscilloscopes, the situation seems to be the opposite, they have a very high sample rate compared to their bandwidth, which probably means that they only operate in the "real-time" mode (not sure, since I don't have such a scope).
Some newer scopes, newly release, still offer both Real Time and Equ-Time. Like Hantek DSO2000
series. But interestingly manual does not discuss this, and observation at fast sweep and risetime
no observable differences in displayed waveform. Repetitive signal.
Marketing crap ? In times of yore, Tek 7854, ETS was very useful as that scope had 100 KS/sec
but good for much higher freq repetitive signals.