When confronted by confused designers, I explain the USB feature I call the
"common-mode noise detector". USB detects a new device connection via a very
simple non-differential circuit, even though the communication is otherwise
differential.
This problem was made noticable by the insistance
sage-
From: david_ster...@ademco.com [mailto:david_ster...@ademco.com]
Sent: Wednesday, September 18, 2002 2:54 PM
To: brian_ku...@leco.com; emc-p...@majordomo.ieee.org
Subject: RE: USB Immunity Specs??
Brian -
USB on a PC is designed for residential environment; stress levels should
be 3V/m f
Brian -
USB on a PC is designed for residential environment; stress levels should
be 3V/m for EN61000-4-3 and 3V for EN61000-4-6.
We got similar results checking USB to EN50130-4 alarm system requirements
(which resemble industrial environment. EFT needs fault-tolerant software
(acceptable pe
Brian,
The products were likely tested to the requirements in EN 55024. 3 V/m
radiated immunity. 3 V conducted immunity. 500 V EFT. That is the product
specific immunity standard for ITE, and USB is an ITE interface. Thus, the
CE Marking was correctly placed on the product. We seldom see pr
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