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LCR meter

Discussion in 'Electronic Repair' started by D-unit, Nov 6, 2007.

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  1. D-unit

    D-unit Guest

    What is an LCR meter?


  2. G

    G Guest

  3. Arfa Daily

    Arfa Daily Guest

    "L", the mathematical symbol for inductance, "C", the same for capacitance,
    "R" the same for resistance, so a meter that measures inductance,
    capacitance, and resistance ...

  4. D-unit

    D-unit Guest

    Is there anything superior about this equipment over a standard
    VOM other than the "L" and the "C"?


  5. G

    G Guest

    No, its rather simple. You can buy better true RMS meters. If
    you have the need for the LC meter, then its real handy. I don't understand
    why more meters don't have the L, other than the need. If you can measure
    C, then it easy to convert to L measurment with the right calculations.

  6. joe

    joe Guest

    Hmm, interesting,
    I have a Capacitance meter, so how do I check an inductor with it ?
  7. John Bachman

    John Bachman Guest

    This seems to be the blind leading the blind.

    There is no way to connect an inductor to a capacitor meter, get a
    measurement and then calculate the inductance.

    If you want to measure resistance then a VOM will do the job. If you
    want to measure capacitance then a capacitance meter will do the job.
    If you want to measure inductance than an inductance meter (I suppose
    that there is such a thing) would do the job.

    If you want to measure resistance, inductance and capacitance with one
    meter then you need an LCR meter.

    See a nice one at

  8. Arfa Daily

    Arfa Daily Guest

    They do come in other combinations as well. My bench portable digital meter
    has the standard volts, amps and ohms ranges, as well as L and C, so I guess
    that's an LCRVA meter ... !!

    One interesting thing that I'd never noticed before. The bank of half a
    dozen switch positions which cover the capacitance ranges, are actually
    marked "F" ...

  9. CJT

    CJT Guest

    Are the inductance ranges marked "H?"
  10. Arfa Daily

    Arfa Daily Guest

    Ah yes ... I see where you're going ! Indeed they are. "H" for Henries, "F"
    for Farads. Each individual range is then marked by its sub multiplier 2n
    ..... 200n .... 200u ....F

    Amazing how 'fixed' you can get in your thinking. I used to have a digital
    meter that had a crude frequency counter - as in it only went to a coupla
    megs - built into it, and I seem to recall that the frequency ranges on that
    were marked "F" also, hence why my poor addled old head immediately thought
    "Frequency" rather than "Farads". Thanks for making me think about it again

  11. G

    G Guest

    Why don't you try it and get back to us. I never tried it. A capicitance
    meter has a resistor, oscillator, and voltmeter. An inductance meter
    has a resistor, an oscillator, and a voltmeter. I would think it
    should work. You do have to generate a conversion graph.

  12. John Bachman

    John Bachman Guest

    The difference is that a capacitance meter usually uses a known
    constant current source to drive the capacitor under test and monitors
    the resulting voltage to calculate the capacitance.

    Conversely, an inductance meter uses a known constant voltage source
    to drive the inductance under test and monitors the resulting current
    to calculate the inductance.

    Therefore, your scheme will not work.

  13. Adrian C

    Adrian C Guest

    For the OP,

    The proper term for these things is 'LCR bridge'

    Googling that shows plenty of examples :)
  14. John Bachman

    John Bachman Guest

    A bridge is one type of LCR meter. The OP originally asked about
    meters, which do not have to be bridges.

  15. Adrian C

    Adrian C Guest

    OK, but I would guess by number that most LCR meters worth using (and
    probably sold) would work by the bridge method?


    So something else to look at...
  16. John Bachman

    John Bachman Guest

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