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|    rec.crafts.metalworking    |    Metal working and metallurgy    |    215,319 messages    |
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|    Message 214,944 of 215,319    |
|    Snag to Bob La Londe    |
|    Re: Odd readings was : Electronics quest    |
|    28 Oct 25 19:45:24    |
      From: Snag_one@msn.com              On 10/28/2025 6:55 PM, Bob La Londe wrote:       > On 10/28/2025 3:23 PM, Snag wrote:       >> On 10/28/2025 5:09 PM, Snag wrote:       >>> On 10/27/2025 3:50 PM, Snag wrote:       >>>> I got the new pot installed in the foot pedal to my TIG machine       >>>> today . Same 47k ohm rating as the original . But there's something       >>>> weird going on , I'm not getting the amperage I set the dial for ,       >>>> it's lower than the setting . Not an earth shaking problem as I have       >>>> never used the full amperage and I can control it now . Still , I'd       >>>> rather get the amperage I have it set at instead of guessing .       >>>       >>> I checked the resistance on that new pot . And I got some odd       >>> readings ... I get 21k maxed out one side and 46k the other side .       >>> Outside terminal to outside I get the 47k plus/minus . THis may or       >>> may not have something to do with output not matching set point . The       >>> other pot measures 47k+- maxed out both ways . I'm having a hard time       >>> understanding the different values , AFAIK these all use a single       >>> wiper center contact so I should be getting the same reading from       >>> either side when maxed out .       >>       >> I should note that the "other pot" mentioned above is the other new       >> one . The old one has readings so unstable you can't tell what they are .       >       >       > Has to be disconnected to get a good reading.       >       >       >               It was unplugged from the welder . Checked at the plug per the       diagram and instructions I downloaded and printed last night . I have a       closer match to the original part on the way thanks to David Billington .       --       Snag        I appreciated foreign cultures more       when they stayed foreign ...              --- SoupGate-Win32 v1.05        * Origin: you cannot sedate... all the things you hate (1:229/2)    |
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