Yes, I was going to point at the USB cable, aka antenna. Can it be
filtered at the receiving end, perhaps by adding an external filter box?
On 2026-05-21 15:20, Jim Bacher, WB8VSU wrote:
Charlie, first thing I would try is making sure they are using a high
quality USB cable. Cheap cables will have issues.
Jim Bacher, WB8VSU
[email protected]
JBRC Consulting LLC
Product EMC & Regulatory Consultant
https://www.trc.guru/ <https://trc.guru/> email:[email protected]
IEEE Life Senior Member
On May 21, 2026 10:15:39 AM Charlie Blackham
<[email protected]> wrote:
Client is having problems testing a legacy medical device at failing
near field 13.56 MHz immunity as per EN 61000-4-39
The product has an external ultrasound probe and connects to a tablet
via USB running “high speed” (12 mbps)
The PIC only supports this USB rate and we’re seeing the ultrasound
measurement being affected and the USB connection dropping out and no
reconnecting.
The product is in a plastic enclosure 😊
Has anyone seen similar issues and been able to resolve them without
a suitable metal enclosure?
Best regards
Charlie
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