Path: ...!news-out.netnews.com!postmaster.netnews.com!us7.netnews.com!not-for-mail
X-Trace: DXC=mX_0Nn1AH_fO5da<66@17mU5[F2hIijDo7J470dMQQ7kJ4R`5ADBYnb^blOYK0N2kbKOZ<<SlTG=c_>AE4g2e\G`f@HSLgR[]oh7dKkgDfTEDliJPUY0^i>7f
X-Complaints-To: support@frugalusenet.com
Date: Sat, 12 Oct 2024 12:25:27 -0400
MIME-Version: 1.0
User-Agent: Mozilla Thunderbird
Subject: Re: EMC compliance question
Newsgroups: sci.electronics.design
References: <67070ba9$1$1783$882e4bbb@reader.netnews.com>
 <ve9e5c$39rmc$1@dont-email.me> <dsfggj1a5m9mise9781qmh1roqv3pb68jr@4ax.com>
 <gtcjgjlhuspq5aktltgrebvgdcqgkgvk36@4ax.com> <vedg2l$440i$2@dont-email.me>
 <0k4lgjl2vb6jd1f2ssguddcfaa2buq9coi@4ax.com>
Content-Language: en-US
From: bitrex <user@example.net>
In-Reply-To: <0k4lgjl2vb6jd1f2ssguddcfaa2buq9coi@4ax.com>
Content-Type: text/plain; charset=UTF-8; format=flowed
Content-Transfer-Encoding: 7bit
Lines: 31
Message-ID: <670aa2f7$1$2385536$882e4bbb@reader.netnews.com>
NNTP-Posting-Host: 127.0.0.1
X-Trace: 1728750327 reader.netnews.com 2385536 127.0.0.1:36321
Bytes: 2382

On 10/12/2024 11:22 AM, john larkin wrote:

> 48 is super common now. All our phones are PoE powered, which is
> typically about 54 volts. Digikey sells warts up to 65.
> 
> The phones are cool. I can take one to Hawaii and plug it in and it
> works just like it does here.
> 
> I imagine that europe has tens, maybe hundreds of millions of PoE
> devices with the chinese version of the CE mark molded into the case.
> 
> So if european manufacturers realy have to do all the CE certs and
> testing, they have one more reason that they can't compete with
> imports.
> 

So as of 2019 it looks like the US rules are similar to the European 
"can't enforce" rules in that the manufacturer takes responsibility for 
everything and it's up to the mfgr how and what tests they perform to 
determine compliance:

<https://www.electronicdesign.com/technologies/test-measurement/article/21209868/recent-developments-in-emc-legislation>

This makes it sound like it's not too expensive to do some basic 
compliance tests on a small-volume product in house:

<https://incompliancemag.com/emc-bench-notes-how-to-use-spectrum-analyzers-for-emc/>

Need a 1 GHz-ish spectrum analyzer at least as the main tool which 
aren't exorbitantly expensive nowadays.