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Yes, on the schematic, but the photos in post #1 show very clearly a two prong ungrounded cord, with one of the conductors attached to the chassis, and not a three prong grounded power cord. Also, the schematic also shows signal ground to the probe connected directly to the neutral wide blade, rather than to the third prong. If there was a three prong cord, and the safety grounded third prong was also connected to the probe, of course this would be an entirely different matter, I am only making a comment on what I see.
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