The mains voltage level is dangerous, and possibly lethal to
touch, so that extreme caution is required whenever you work
on wiring or components connected to the mains. None the
less, it is sometimes required to investigate the shape of the
mains voltage using an oscilloscope, for instance, if you want
to measure the mains current consumption of a device, or
establish the degree of mains pollution caused by a certain
load. The circuit described here reduces the risks of
connecting an oscilloscope input to the mains to a minimum.
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