Good afternoon, I'll repeat my earlier story and give the group an update. We
have made some small changes to our product (prominently to Y-caps, and some
beads) which unfortunately did not increase our margin vs EMC limits, but the
product still passes FCC and ISED. Engineering wanted to use the
self-declaration process to document these changes, including passing test
results w/o going through the TCB and re-file process. The changes do appear
to classify for what CFR 47, Part 15 § 2.1043 call a class II permissive
change, but it's just as certain that the original FCC and ISED ID's are still
valid as the product is roughly the same, still passes emission limits and made
no changes to the WiFi system (same chip, location, antenna, and firmware).
I've been told - by (a) an engineer from a well-known EMC/TCB, and (b) an
engineer at a local EMC test lab - that Class II permissive change only
applies to intentional radiators. I can't find the legal language in Part 15
that spells this out; does anyone know? Does anyone want to confirm
Engineering's assertion that SDoC will suffice? Thanks, Colorado Brian
Please note: forwarded message attached
From: David Schaefer <david.schae...@element.com>
To: Brian Gregory <brian_greg...@netzero.net>, "EMC-PSTC@LISTSERV.IEEE.ORG"
<EMC-PSTC@LISTSERV.IEEE.ORG>
Subject: RE: [PSES] Necessary Lab accreditations, class 2 permissible change
Date: Thu, 10 Aug 2023 15:42:24 +0000
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Certification activities in the USA are handled by TCBs. Most test labs either
have a separate TCB group, or work with a specific TCB for approvals. You
should work with a lab to determine what tests need to be repeated, and take
the data. Based on the new data the lab can determine if it is a Class 1 or
Class 2. For a Class 2 the TCB will do a filing with the FCC. For a Class 1 you
just need to keep the data on hand internally to prove the change was
investigated.
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David Schaefer​
Technical Manager
Element Materials Technology
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From: Brian Gregory [mailto:brian_greg...@netzero.net]
Sent: Thursday, August 10, 2023 10:01 AM
To: EMC-PSTC@LISTSERV.IEEE.ORG
Subject: Re: [PSES] Necessary Lab accreditations, class 2 permissible change
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Yes, we increased the Y-Caps to get more margin. And we did!
So, to qualify for a Class 1 permissive change, we'd need to show before &
after data ?
Applying for a Class 2 permissive change, means FCC will look only at the
latest data to be sure it passes?
Colorado Brian
---------- Original Message ----------
From: John Woodgate <j...@woodjohn.uk<mailto:j...@woodjohn.uk>>
To: EMC-PSTC@LISTSERV.IEEE.ORG<mailto:EMC-PSTC@LISTSERV.IEEE.ORG>
Subject: Re: [PSES] Necessary Lab accreditations, class 2 permissible change
Date: Thu, 10 Aug 2023 00:02:42 +0100
What are you changing about the Y-caps? If it's just a new supplier and the
caps conform to the required component standard, there is no degradation.
Reducing he capacitance would be a degradation for EMC but not for safety.
Who determines the class is the person who has all the necessary data. The test
house of surveillance authority check the decision.
On 2023-08-09 23:20, Brian Gregory wrote:
Hello EMC experts,
A question came up today about filing new results to FCC for our legacy product.
1. If the filing is only for FCC, then the lab providing the report does not
need A2LA accreditation,
2. If the filing is for a safety report, then the lab does need A2LA
accreditation.
Have I got that right?
We're filing some small board changes, including Y-caps and can't figure out if
this is a Class 2 permissible change, defined as: " includes those
modifications which degrade the performance characteristics as reported to the
Commission"
3. How or who determines if our change is Class 2 (degraded performance) or
Class 1?
We think the results are better, but it's not like we got uniformly more margin
across the board.
Thanks!
Colorado Brian
720-450-4933
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