On 7 October 2016 at 20:08, Gene Heskett <[email protected]> wrote: > Force one probe to actually dent the surface so you know you are making a > connection WITH that probe. Then lay, or let gently swing to touch a > clean looking spot, the other probe, without using the point, or a sharp > edge on the test aluminum and the gentlest touch you can manage. Your > digital volt/ohm meter, which likely doesn't use more than its internal > battery voltage, 9 volts max, shouldn't be able to detect a connection. > You will not get a connection until you have applied enough force to > crush/penetrate that oxide film, which if its fresh, as in a 1 hour old > machined surface might be 10 atoms thick, but its still growing thicker, > maybe 100 atoms thick 2 weeks later. Thats good for around 400 volts
Have you actually tried to prove this theory of yours? I just did. On a bit of aluminium sheet that was lying on my desk, which, until it fatigued through, had been the bracket for the light on my bicycle. You might think that theory trumps experiment, but I disagree. Maybe thats why they paid me to do experiments in metallurgy for all those years? -- atp "A motorcycle is a bicycle with a pandemonium attachment and is designed for the especial use of mechanical geniuses, daredevils and lunatics." — George Fitch, Atlanta Constitution Newspaper, 1916 ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, SlashDot.org! http://sdm.link/slashdot _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
