/technologies/test-and-measurement/b/blog/posts/reducing-common-mode-noise-with-ferritesMaking low-noise measurements can be hard! Sometimes, if the device-under-test is small, I try to place it inside a shielded enclosure. There are some (+) Ideas on Building a Shielded Test Enclosure - element14 Community here. There was a r...en-USTelligent Community 12https://community.element14.com/technologies/test-and-measurement/b/blog/posts/reducing-common-mode-noise-with-ferritesFri, 29 May 2026 21:12:23 GMT93d5dcb4-84c2-446f-b2cb-99731719e767:ca5e1318-bfc6-433d-9b43-d5c7d9438b7fDAB0<p>Very interesting.</p> <p>I learned how to use ferrite cores back in the 1980&#39;s when we had to send our box for EMI testing.</p> <p>Initially, we failed miserably, but then we hired their engineers to consult and they showed us how to use ferrite cores to clean up everything.</p> <p>A little rework and we had a box that passed.</p> <p>We installed it in the helicopters and it worked fine.</p><img src="https://community.element14.com/aggbug?PostID=29809&AppID=13&AppType=Weblog&ContentType=0" width="1" height="1">