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  1. 02-04-2020 #10
    Doddy's Avatar
    Lives in Preston, United Kingdom.
    Doddy
    Last Activity: 4 Days Ago Has been a member for 9-10 years. Has a total post count of 1,364. Received thanks 188 times, giving thanks to others 66 times. Referred 1 members to the community.
    Wow!, just... Wow! I take back everything.

    Following the previous post I'd realised I have a bench PSU with a chunky toroidal transformer that I'd previously hacked to pieces. Sounds like a good experimental platform. Ignore all the crap on the bench - I really need to tidy up.

    Pic 1: General topology, next-to-nowt resistance (0.1R) from the top of the mounting bolt to the chassis.
    Click image for larger version.  Name: IMG_0248.jpg  Views: 2528  Size: 101.8 KB  ID: 27703

    Pic 2: Open circuit Vacrms reading from the top-bolt to chassis - about half a volt. A lot more than I'd expected and enough to ignore the fancy stuff with a shunt resistor and 'scope, and go straight for the "blow-the-hell-out-of-the-meter" probe...
    Click image for larger version.  Name: IMG_0251.jpg  Views: 2542  Size: 121.8 KB  ID: 27704

    Pic 3: Current short, top bolt through meter and 3 metres of meter leads to ground. Some 3.1A.
    Click image for larger version.  Name: IMG_0253.jpg  Views: 2513  Size: 127.5 KB  ID: 27705

    So, yeah, isolate that top bolt!
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