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Edited by gf1 at 2019-3-20 14:50
Certainly not 150V. I don't remember exactly either, but I think it was raher about 40V (peak, of course).
EDIT: I checked the manual. You are right, the specs indeed say "input protection voltage 150V RMS."
The 40V or 50V I had in mind are for a different device.
What V/div was set, when you connected the high voltage?
At >= 500mv/div, there is still an internal attenuator directly at the input, prior to the the buffer amp.
At <= 200mV/div, this attenuator is bypassed.
Do you still see horizontal traces on the scope screen, or is the scope completely dead?
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