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I am interested in testing some low voltage cables for their quality. For example, USB, audio and Ethernet cables.

Testing continuity is simple, but I want to know if these cables may momentarily disconnect when stressed, such as when bent.

The ideal indicator would be like the buzzer from my multimeter which I can hear a sound with continuity only that I want to hear a sound when there is an open circuit. Is it something that I can add to my multimeter to test for short period of open circuit? It would be even better if I can use it to test headphone cable (without having to cut the cable, of course).

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  • \$\begingroup\$ The Behringer cable tester CT100 does exactly that. Is three wires at the time enough for you? \$\endgroup\$ – winny Aug 14 '18 at 7:01
  • \$\begingroup\$ Sure, something can be designed as an add-on to your multimeter. It would be simpler to make a dedicated tester though, no real need to get the multimeter involved. No need to design one either, see winny's comment: it exist already. And it is even affordable. \$\endgroup\$ – Bimpelrekkie Aug 14 '18 at 7:17
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    \$\begingroup\$ If you stress a cable which is intended for high frequency signals like an Ethernet cable, it may physically still pass a DC current but not be able to pass the signal it is designed for. \$\endgroup\$ – Oldfart Aug 14 '18 at 7:21
  • \$\begingroup\$ Good point. Fortunately, I also have a managed Ethernet switch that can also test for signal quality. \$\endgroup\$ – some user Aug 14 '18 at 15:27

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