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Zenor Diode tests as a regular Diode Can you help?

Discussion in 'General Electronics Discussion' started by Low Voltage, Oct 19, 2016.

  1. Low Voltage

    Low Voltage

    3
    1
    May 18, 2011
    I am repairing a circuit board that has a component Labeled as ZD5.
    I removed it for testing and it has a Zenor symbol under it.
    When I check it with my scope using the Lissajous pattern test it
    shows up as a standard diode.
    Does anyone have any ideas as to why?

    Thanks, Wade.
     
  2. Audioguru

    Audioguru

    2,618
    593
    Sep 24, 2016
    When forward biased then a zener diode is an ordinary diode that has a voltage of about 0.7V. It breaks down at its rated voltage when it is reverse biased. Maybe your tester does not have enough voltage to test its zener voltage.
     
    Arouse1973 likes this.
  3. R0und_R0bin

    R0und_R0bin

    7
    1
    Oct 14, 2016
    What is the purpose of ZD5 in your circuit? Because under zener symbol (especialy on the board) it can be uni or bi directional or TVS.
    Anyway, you'll need a certain amount of current flowing into (forward or backward) to see the breakdown voltage.
    So try with more current.
     
    Last edited: Oct 20, 2016
  4. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    25,220
    2,695
    Jan 21, 2010
    That's nonsense.

    Go with Audioguru's answer
     
  5. R0und_R0bin

    R0und_R0bin

    7
    1
    Oct 14, 2016
    Explain you dear moderator. Just saying "that's nonsense" doesn't help anybody.
    And I will be very pleased to read your explanation.
     
  6. davenn

    davenn Moderator

    13,352
    1,775
    Sep 5, 2009
    as Steve said, read Audioguru's response ... it's the voltage, not current
     
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