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From: john larkin <jl@glen--canyon.com>
Newsgroups: sci.electronics.design
Subject: Re: EMC compliance question
Date: Wed, 09 Oct 2024 16:18:26 -0700
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On Wed, 9 Oct 2024 19:03:28 -0400, bitrex <user@example.net> wrote:

>What's the deal with the "CPU board" exemption?

Where is there such an exemption?


>
>"CPU board. A circuit board that contains a microprocessor, or frequency 
>determining circuitry for the microprocessor, the primary function of 
>which is to execute user-provided programming, but not including:
>A circuit board that contains only a microprocessor intended to operate 
>under the primary control or instruction of a microprocessor external to 
>such a circuit board; or
>A circuit board that is a dedicated controller for a storage or 
>input/output device."
>
>So if one sells a board that has say a PIC on it and some support logic, 
>and the 9kHz+ signals are all internal to the uP (self-clock), but it's 
>otherwise a functionally complete design other than it's not in a 
>housing, is that an exempt product?