Using an ESR Meter (and Reference Chart)

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  • steve2
    replied
    Re: Using an ESR Meter (and Reference Chart)

    This is from the Blue ESr meter meter manual.
    What is bad ESR?
    There is a chart of 3 X normal average ESR for various capacitor values and voltage ratings on the meter front
    panel. There is no one bad value; it depends upon the rating of the capacitor you are testing.
    In general, a capacitor with bad ESR will read at least 2 – 3 times the values given for a new capacitor by the
    manufacturer. The values shown on the chart are generally 3 times the manufacturer’s specs. A really bad one
    might be 10 times the values shown or more.
    With experience you will be able recognize bad ones without consulting the chart.

    Leave a comment:


  • lkvee
    started a topic Using an ESR Meter (and Reference Chart)

    Using an ESR Meter (and Reference Chart)

    I just got my ESR Micro 3.1

    I'm having fun testing out all sorts of capacitors with it. I always remember to discharge 'em before testing 'em.

    I'm wondering about the reference charts that give a ballpark maximum acceptable ESR.

    When I get a reading of 0.00 of 0.01 Ohms, I'm happy enough once I identify a reputable brand on the capacitor.

    When I get a reading of 25 Ohms, I'm happy because I know I can extract it and discard it.

    I'm wondering about the next steps once I identify a cap whose ESR hovers around that acceptable number.

    Most of the reference charts I've seen list discreet readings for capacitance, voltage, and ESR. I can't find a mathematical formula that can let me input the nominal capacitance and voltage and spit out the maximum acceptable ESR. I know this formula will vary from meter to meter, and I'd be happy to use Bob Parker's formula, too.

    Thx 4 reading!

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