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This was originally posted on APC forums on 11/5/2017
Trash picked (well almost), 2009 vintage Dell model SU3000RM. New batteries and it is up and running, looks very clean.
Put a scope on it - and YIKES. I'm using a very cheap USB scope - DDS-120, btw. Other Smart-UPS units in the house look fine during a test.
Self test and actually puling the power cord look the same. Is it my scope?
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