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dso 138 problem please help!

Posted: Thu Jun 29, 2017 9:12 am
by MadDHatter
i have a problem with my dso 138,
it has trace but it does not respond to any signal it gets,
it also does not display any freq. or voltage,
everything seems to work fine but i cannot also test the inbuilt signal for some reasons
i dont know why

can you help me? please.