wrote in message
oups.com...
WARNING... DANGER.... what is the point of floating the AC ground on
the scope, it is not only dangerous, but totally unneccessary as long
as the equipment that you are troubleshooting is being powered via an
isolation transformer..... that is the whole reason to use an isolation
transformer so that things like a hot chassis television power supply
can be easily hooked up to properly grounded test equipment without
making sparks fly and exposing yourself to unneccessary hot ground
hazards... keep the safety ground (3 prong plug) connected on your
test gear... in a large shop or manufacturing and testing facility that
has accountability to OSHA, disconnecting the safety ground for any
reason is a flagrant and dangerous violation.
electricitym
.
.
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I agree - isolation is best, but if the 'scope has a 3-wire power cord,
with a properly grounded chassis, and the outlet is properly grounded,
should you not be able to just use the positive probe of the 'scope to look
at the primary, and not even connect the test lead ground wire to anything?


Mark Z.