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Pot resistance

Discussion in 'General Electronics Discussion' started by jrisebo, Nov 29, 2011.

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  1. jrisebo

    jrisebo

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    0
    Nov 29, 2011
    I am looking to find out what the resistance of a Allen Bradley Pot is. The markings are 8466 Type J, and thats it. The schematic for the piece of equipment calls for a 8K resistor, but the Allen Bradley is a replacement, and it has a resistor between two of the posts. I am trying to find a Clarostat replcement to match the others that are in the piece of equipment. Hit me up for more info if you need it.
    Thanks
    Jim
     
  2. Resqueline

    Resqueline

    2,848
    2
    Jul 31, 2009
    There has to be more markings somewhere, for example 1k, 5k, or 10k. You can also measure it if you have a DMM, and read the (color) codes of the resistor.
     
  3. jrisebo

    jrisebo

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    Nov 29, 2011
    Sorry, this is a potentiometer resistor, not a inline resistor with the color bands.
     
  4. Resqueline

    Resqueline

    2,848
    2
    Jul 31, 2009
    From that I interpreted that the A-B pot had a fixed resistor soldered between two of its three posts. Maybe it was a misinterpretation. Perhaps you could supply a picture?
     
  5. jrisebo

    jrisebo

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    Nov 29, 2011
    I will take a picture tonight. It does have a fixed resistor between two of the posts on the pot, but I dont even know what resistance the Pot is. Im a novice at electronics, just enough knowledge to fry something, lol. Doesnt help that this is from the 60's
     
  6. Resqueline

    Resqueline

    2,848
    2
    Jul 31, 2009
    Ok, so I did interpret it correctly, and it was this fixed resistor (color) code I was asking about above (I just put it all in one line). Do you have a measuring instrument?
     
  7. jrisebo

    jrisebo

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    Nov 29, 2011
    Here are the pictures, I have measured the fixed resistor at 6K ohms, not sure if the color banding confirms. How do I know what the resistance of the POT is?
     

    Attached Files:

  8. jrisebo

    jrisebo

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    Nov 29, 2011
    By the color bands, someone else told me its a 39K resistor. Not sure why its even there, can you reduce a pot with a fixed resistor across?

    I have ordered a 10K POT to replace this. The schematic calls for a 8K, do I need a 2K resistor across like this, or does it not really matter?
     
  9. duke37

    duke37

    5,364
    769
    Jan 9, 2011
    10k in parallel with 39k equals 8k.
    The value of the pot is normally marked around the edge.

    Duke
     
  10. Resqueline

    Resqueline

    2,848
    2
    Jul 31, 2009
    Like Duke says it does make sense with a 39k resistor in parallel with a 10k pot to make an 8k pot. If it really matters for the circuit, who knows..
    It wasn't easy to see how it's connected though. Can you verify from my attachments if it's wired like I believe?
     

    Attached Files:

  11. jrisebo

    jrisebo

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    0
    Nov 29, 2011
    I will take a better pic tonight for you. Im gonna check tonight for any markings around the edge.
     
  12. jrisebo

    jrisebo

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    0
    Nov 29, 2011
    Heres a better picture. It looks like its jumped between 1&2, and the resistor between 1&3. Not sure what that does.
     

    Attached Files:

  13. Resqueline

    Resqueline

    2,848
    2
    Jul 31, 2009
    Ok, then it's wired like in my little diagram. It becomes 0 ohms when turned fully CounterClockWise, and 8k ohms when turned fully ClockWise.
    It seems you can use the 10k pot you ordered, and you can transfer the 39k resistor to this if you choose.
     
  14. jrisebo

    jrisebo

    8
    0
    Nov 29, 2011
    Cool, then that makes sense. its for a voltage power supply, so one way, 0 volts, the other way the max. Thanks for everyones help
     
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