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Resistor Value Identification Help

Discussion in 'General Electronics Discussion' started by Namestaken, Dec 20, 2016.

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  1. Namestaken

    Namestaken

    3
    1
    Dec 20, 2016
    I have searched around the internet, used a plethora of online tools, and I'm at a complete loss as to what value this resistor is supposed to be. It's a 5-band, thin-film resistor with color codes: Yellow - Violet - Green - Gold - Green. I can post a picture, if anybody wants to see it.

    I find this to be 47.5 Ω and 0.5% tolerance. It is on a 120V line so I expect the rating to be > 300W. I can't even find a resistor with these ratings online. When I test it with my multimeter, it registers as 4.7M Ω. Another multimeter that maxes at 2000K Ω doesn't register it at all.

    It feels like too much of a coincidence to be wrong but I can't figure out how 4.7M is the correct value. Can anybody else shed some light on this?

    Thank you very much for your help!
     
  2. Alec_t

    Alec_t

    2,859
    767
    Jul 7, 2015
    Yellow, violet, green = "4, 7, 5" = 47x10^5 = 4.7MΩ.
     
    Namestaken likes this.
  3. Namestaken

    Namestaken

    3
    1
    Dec 20, 2016
    I agree if it was 4-band but I thought 5-band was like this:

    upload_2016-12-20_11-14-50.png
     
  4. davenn

    davenn Moderator

    13,617
    1,881
    Sep 5, 2009
    except green isn't a valid tolerance band colour so the gold is your tolerance and the green may be a voltage rating or something ... cannot find a reference

    trust your meter

    EDIT .... OK found this

    [​IMG]


    note the comments ... "If band 4 is gold or silver, then it is the tolerance band and the 5th band is a temp coefficient rating


    Dave
     
    Last edited: Dec 20, 2016
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  5. Namestaken

    Namestaken

    3
    1
    Dec 20, 2016
    Beautiful! I wish I had found that on my own. I truly appreciate both of your help in understanding. I trusted my meter, I just wanted to bridge the gap between what it was telling me and my previous understanding. This tidbit seems to be missed by a lot of online resources.
     
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  6. davenn

    davenn Moderator

    13,617
    1,881
    Sep 5, 2009
    Namestaken likes this.
  7. BobK

    BobK

    7,682
    1,686
    Jan 5, 2010
    How does one mark a five band resistor of < 100Ω then?

    Bob
     
  8. davenn

    davenn Moderator

    13,617
    1,881
    Sep 5, 2009
    [​IMG]

    note the 4 band is the multiplier and the 5th band the tolerance ... limited to BN, RD, GLD, SI or BL


    the more it's looked into the more crazy it gets, as some manufacturers don't stick by the standards and come up with their own ideas for
    band 4 and band 5. eg Mullard
     
  9. BobK

    BobK

    7,682
    1,686
    Jan 5, 2010
    But that chart clearly shows the fourth band gold as a multiplier of 0.1 And I have seen other charts that show green as a 0.5% tolerance.

    Bob
     
  10. davenn

    davenn Moderator

    13,617
    1,881
    Sep 5, 2009
    yes, that is correct

    as I said there are some manufacturer variations
    you can see them on that page to link to
     
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