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Accuracy Component Tester.

Discussion in 'General Electronics Discussion' started by caps, Oct 13, 2018.

  1. caps

    caps

    155
    8
    Jul 29, 2018
    Hi all
    Who was interested in what the measurement accuracy in the transistor tester?
    In my opinion, it’s not very bad,at about 1%.
     
  2. caps

    caps

    155
    8
    Jul 29, 2018
    Resistor 1 Ohm 1%.
     

    Attached Files:

  3. caps

    caps

    155
    8
    Jul 29, 2018
    0,1 Ohm 1%.
     

    Attached Files:

  4. ratstar

    ratstar

    54
    0
    Aug 20, 2018
    1% error sounds really great until your talking about pico amps, then its 0.00001% accuracy required i think.
     
  5. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    25,178
    2,690
    Jan 21, 2010
    Why? My picoammeter is around a couple of percent accurate. It works fine.

    I think you misunderstand what accuracy means.
     
  6. BobK

    BobK

    7,609
    1,648
    Jan 5, 2010
    Um... A 0.1Ω resistor read as 0.11Ω is off by 10%. To be 1% it would have to be between 0.099 and 0.101.

    The error has to be calculated as a percentage of the correct value.

    Bob
     
  7. caps

    caps

    155
    8
    Jul 29, 2018
    In order to measure 0,101Ohm, it lacks resolution.
     
  8. caps

    caps

    155
    8
    Jul 29, 2018
    Precision resistor 0,01 Ohm 1%.
     

    Attached Files:

  9. BobK

    BobK

    7,609
    1,648
    Jan 5, 2010
    You cannot have more accuracy than you have resolution. But the reverse is not true.

    In your 0.01 example, if it can only display the 1/100 digit, the true measurement might be anywhere from 0.0005 to 0.015 and it would display 0.01. So the precision is about 50%

    Bob
     
  10. Ratch

    Ratch

    1,042
    306
    Mar 10, 2013
    What parameter of the transistor is the transistor tester measuring?

    Ratch
     
  11. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    25,178
    2,690
    Jan 21, 2010
    Resistance :-?
     
  12. Ratch

    Ratch

    1,042
    306
    Mar 10, 2013
    Don't think so. The resistance of a semiconductor varies with the voltage of the ohmmeter. It does not follow Ohm's law.

    Ratch
     
  13. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    25,178
    2,690
    Jan 21, 2010
    Exactly.

    We haven't seen any measurements you'd typically associate with a transistor.

    But I know these devices do them.

    Of what they test, I'm not sure you need any particular level of accuracy. Even if you want to find closely matched devices, all you need is something which produces repeatable (and possibly reasonably precise) results, not necessarily highly accurate ones.
     
  14. kellys_eye

    kellys_eye

    4,284
    1,145
    Jun 25, 2010
    Personally I'd use a resistance meter to test a resistor and leave 'that' particular test device for what it was originally intended - semiconductors.
     
  15. Ratch

    Ratch

    1,042
    306
    Mar 10, 2013
    The OP wrote "transistor tester". Perhaps he meant transistorized tester (ohmmeter).

    Ratch
     
  16. Ratch

    Ratch

    1,042
    306
    Mar 10, 2013
    Too bad this testor is not manufactured anymore. It did a quick check on a transistor by determining if it could invert a pulse. http://www.cbtricks.com/miscellaneo...ore_tf26_cricket_full_sm_with_corrections.pdf

    Ratch
     
  17. kellys_eye

    kellys_eye

    4,284
    1,145
    Jun 25, 2010
    Nope, the screen (LCD) display is that of one of those cheapo Chinese 'multi-tester' devices.
     
  18. Hopup

    Hopup

    226
    30
    Jul 5, 2015
    I myself have one of these cheap meters and it is pretty useful, have not used it for transistors other than initial testing of the device. They should be able to detect Hfe, Ube and other parameters, but if I remember right, the results were not very good.
     
  19. caps

    caps

    155
    8
    Jul 29, 2018
    Resistance.
     
  20. caps

    caps

    155
    8
    Jul 29, 2018
    Precision resistance.
    1,8к 1%.
    3,16к 0,1%.
     

    Attached Files:

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