I want to know how to measure this components in the attached picture. If I'm right they are beads. The second one the brown one I thought at first that it is a capacitor but I can't measure its capacitance so I think it is a bead too. enter image description here How to measure their values and what are they called?

  • 2
    \$\begingroup\$ Very similar to this question: electronics.stackexchange.com/questions/438624/… \$\endgroup\$
    – Puffafish
    May 24, 2019 at 14:16
  • \$\begingroup\$ No.these are not capacitors.i know how to measure capacitors.i actually measured all the capacitors on this board by desoldering them and measuring them.but those are not capacitors \$\endgroup\$
    – Jwdsoft
    May 24, 2019 at 14:38
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    \$\begingroup\$ How did you measure these components? With a multimeter or RCL meter? And how did you dind out those were not capacitors? Next, is there any silkscreen (white) text next to the components? \$\endgroup\$
    – Huisman
    May 24, 2019 at 14:44
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    \$\begingroup\$ Please tell us what you've tried to do so far in the question. If people don't know whether you've tried only to test these in circuit they're going to make sure you're not trying to test them in circuit. \$\endgroup\$ May 24, 2019 at 14:48
  • \$\begingroup\$ They could be capacitors, despite your measurements. If they are very small values, your meter may not be capable measuring them. If they are inductors, you could use an ohmmeter - an inductor of that size should look like a short circuit to an ohmmeter. But, I expect they are capacitors. Most inductors are dark gray, not yellow or tan or brown \$\endgroup\$
    – JRE
    May 24, 2019 at 16:04

1 Answer 1


The first one has designator L1 so it most likely is a ferrite bead.

The second one is most likely a capacitor. You can't measure capacitors when they are connected to the circuit, the rest of the circuitry will affect the reading. The capacitor value might be so low that general purpose multimeter cannot measure it.

  • \$\begingroup\$ OP also claimed that items marked red are not capacitors. Possibility is that OP measured all components the OP recognized as capacitors, like electrolytics and tantalums, and did not measure components not recognized as capacitors by OP. \$\endgroup\$
    – Justme
    May 24, 2019 at 17:25
  • \$\begingroup\$ Think you're right \$\endgroup\$
    – Huisman
    May 24, 2019 at 18:34
  • \$\begingroup\$ I took them off circuit because in circuit will measure all parallel capacitors value.i think i should use a LCR meter to measure them since i used a general purpose multimeter.how to measure the first one the ferrite bead ? Or is their a particular inpedence for them judged by size \$\endgroup\$
    – Jwdsoft
    May 24, 2019 at 19:18
  • \$\begingroup\$ Ferrite beads have a rated impedance at 100MHz usually. In addition to DC resistance, and maximum current they can handle. \$\endgroup\$
    – Justme
    May 24, 2019 at 20:18
  • \$\begingroup\$ So how would i find a replacement ferrite bead for this one i have ? How would i measure it's value to find the correct one. \$\endgroup\$
    – Jwdsoft
    May 25, 2019 at 20:14

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