Hantek 2d42 no oscillosocpe signal

gf1 · Post time 2019-3-20 04:53:43

Did you measure the 120vac with the DMM or with the scope?
If you did use the scope, did you set the switch on the probe to x1 or x10 position?

gf1 · Post time 2019-3-20 07:54:24

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?