I acquired this HP 3456A voltmeter at the Dayton Hamvention. When I first plugged it in it displayed .OL for overload and failed the built-in self test. Watch the video to see how I fixed it.
Historical information
I acquired this HP 3456A voltmeter at the Dayton Hamvention. When I first plugged it in it displayed .OL for overload and failed the built-in self test. Watch the video to see how I fixed it.