Brian, for margins it's not required by the standards. It is a "Personal
Preference". I have always used and recommended 6 dB for prototypes / first
production and 3 dB margin for production audits.
As Brent mentioned there is variation in measured levels between test
sites. However, your product in production will also have RF emission
variations.
All produced products need to be compliant, not just the one you tested.
How consistent are your production units? If they are very consistent, then
a lower margin might be Ok.
Jim Bacher
On July 8, 2023 12:41:10 AM Brian Gregory <brian_greg...@netzero.net> wrote:
Hi there,
A question came up that I can't answer w/o a copy of Part 47.
Does the FCC report require Quasi-Peak (QP) data, or just Avg and Peak.
When do peak readings trigger the need to report QP? I'm pretty sure Part
15 has AVG and QP limits listed.
Next was what sort of margin is expected in order to pass CE emissions
requirements (CISPR 16 or 32)? Memory serves that one wants 3dB of margin,
but memories can be imperfect!
"Colorado" Brian
720-450-4933
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