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Trying to identify components...

Discussion in 'Troubleshooting and Repair' started by Explorer, Jun 25, 2014.

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  1. Explorer

    Explorer

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    Mar 28, 2014
    In a nice old meter that doesn't work. The components are the 2 identical ones that are wrapped in brown tubes and have one set of leads twisted together. (2 photos attached.) Diodes? Fuses?

    Meter components.jpg Meter.jpg
     
  2. Arouse1973

    Arouse1973 Adam

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    Dec 18, 2013
    Well I have seen a lot of components but I must admit I haven't a clue. They must be older than me :) Steve might know :)
    Adam
     
  3. KrisBlueNZ

    KrisBlueNZ Sadly passed away in 2015

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    Nov 28, 2011
    Likewise, I've never seen those before. My guess would be fuses.

    Have you measured them for resistance? Are there any markings on them?
     
  4. Arouse1973

    Arouse1973 Adam

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    Dave might also know :)
     
  5. davenn

    davenn Moderator

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    LOL ... .I'm at a loss too

    do as Kris asked, also do a little circuit tracing around them see what they are connected to/between

    have you tried to google for a schematic of the meter ?

    cheers
    Dave
     
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  6. dude

    dude

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    Apr 15, 2014
    They are germanium diodes.
     
  7. davenn

    davenn Moderator

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    really ? not like any diode I have ever seen but hey

    got a link to something to confirm that for all of us to learn ?

    Dave
     
  8. KrisBlueNZ

    KrisBlueNZ Sadly passed away in 2015

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    Yeah I'm doubtful as well. The wires on them are very thick, and crimped, and I don't see any polarity indication. Where's the evidence that they're diodes?
     
  9. KrisBlueNZ

    KrisBlueNZ Sadly passed away in 2015

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    Yep... Although I wouldn't normally trust any document written completely in MS Comic Sans, I have to admit that those components look very much like the second-to-rightmost one in this picture from page 13.

    olddiodes.jpg

    Apologies for doubting you, Mr. dude.
     
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  10. davenn

    davenn Moderator

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    cool article ... thanks lots ... yeah does look VERY similar to that one huh

    awwww Kris, I get so flaming bored with Arial or Times New Roman, I regularly write my www site pages in MS Comic Sans :)

    Dave
     
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  11. dude

    dude

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    Apr 15, 2014
    No problem Kris, its good to doubt.
     
  12. KrisBlueNZ

    KrisBlueNZ Sadly passed away in 2015

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    I think that's the problem - many people like it. So, people who obsess about that sort of thing (font nerds, I guess) associate it with mediocrity. The way I associate those title pages you see in old YouTube videos, that have blue backgrounds and moving text, with Windows Movie Maker.
     
    Last edited: Jun 26, 2014
  13. Arouse1973

    Arouse1973 Adam

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    dude likes this.
  14. Explorer

    Explorer

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    Thanks, guys! Thanks for the PDF and photo!

    I can't find any info online on the device itself (e.g., schematic). Nothing comes up when I google the brand name " A and A" and multimeter.

    I'll desolder the the diodes tomorrow and test them. There's one capacitor buried deep inside the thing. Does anyone know, if that cap has failed, would the whole meter be entirely nonresponsive?
     
  15. KJ6EAD

    KJ6EAD

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    Aug 13, 2011
    That meter looks very much like some Triplett models.
     
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