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Thread: Inductor DCR Measurement

  1. #1
    Join Date: Dec 2018

    Location: Cambridgeshire UK

    Posts: 37
    I'm William.

    Default Inductor DCR Measurement

    Hi Guys

    I want to upgrade the inductors in my ML speakers, I know the inductance 2.5mH but I have no idea of the DCR. Having done some research I understand that the DCR is crucial. However, it is not available. There are no markings on the installed inductors so I have drawn a blank there.

    I would appriciate your thoughts please.

    Many thanks



  2. #2
    Join Date: Apr 2012

    Location: Southall, West London

    Posts: 43,802
    I'm Geoff.


    If you know the wire gauge, then you can measure the inductor cross section and core size, then look online for the length of that wire required to produce a 2.5 mH inductor of those dimensions. I'm supposing that info is available. If it is, then see if you can find the DCR for that length of wire somewhere, I reckon it should be available, probably on one of the speaker building sites.
    "when common sense, logic and plausibility are excluded. All that remain are foolishness and lies"

  3. #3
    Join Date: Oct 2012

    Location: The Black Country

    Posts: 5,479
    I'm Alan.


    You can measure it with a standard multimeter, but not to great accuracy if it is fractions of an ohm.

    A more accurate method would be to put a known current through the inductor, say 1 amp, then measure the voltage across the inductor with the millivolt range on the multimeter.

    For every millivolt on the reading that is a milliohm of resistance.

  4. #4
    Join Date: Sep 2014

    Location: brighton uk.

    Posts: 4,648
    I'm jamie.


    if your feeling flush treat yourself to the dats v2 software,it has built in capacitor,inductor and resistor measuring software.
    My System
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    PMAT-1010 MK6 Tonearm.
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