Hi Brian. It's not entirely clear which measurement range you are
asking about, but I'll assume conducted emissions in the range of 150
kHz to 30 MHz.
Short answer: You can skip QP and Avg detection if the peak detection
level is below the Avg detection limit.
No margin is "required" to pass any emissions limit. Zero dB margin is
still passing. That said, measurement uncertainty in that range is
generally 3-4 dB, so having a passing margin greater than that gives you
some confidence that a re-test at another time and lab will still pass.
Hope that helps.
respectfully,
Brent DeWitt
Milford, MA
On 7/8/2023 12:38 AM, Brian Gregory 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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