REFERENCE

Regulatory coverage

Coverage is listed per clause and condition. The regulatory text is published in the Electronic Code of Federal Regulations at 47 CFR 15.109, Radiated emission limits. Implementation in source, availability in production and independent validation are separate states and are reported separately.

Clause	Conditions	Implemented	Availability	Independent validation
47 CFR 15.109(a)	Class B radiated emission limits. Bounded checks for supported inputs: stated frequency, level, unit, detector and a 3 m measurement distance, for an unintentional radiator of stated class.	Bounded checks	Pilot workspaces	None claimed

Not covered

Other clauses of FCC Part 15 Subpart B, including conducted emissions.
CISPR 32 / EN 55032.
IEC 61000 immunity standards and MIL-STD-461.

Evidence packages

An evidence package gathers what is needed to review a finding on one revision. It is a record for engineering review, not a certification document or a public data format.

Contents	Description
Revision	The product and revision the evidence concerns
Requirement	Clause, version and basis for applying it
Confirmed inputs	Values used, each with its source reference
Conditions	Recorded test conditions
Result	Evaluated result and margin, with the rule version, alongside the reported values
Missing items	What prevented a check or comparison
Review record	Decisions, the next-test plan and recorded results

Worked examples

Illustrative · fictional product and measurements

A · Supported evaluation

A Rev B report lists an emission at 216.8 MHz. All required inputs are present and confirmed.

INPUTS AND RESULT · EXAMPLE A

revision      Rev B, as tested
requirement   47 CFR 15.109(a), Class B
frequency     216.8 MHz
level         47.0 dBµV/m   confirmed
detector      quasi-peak
distance      3 m
polarization  horizontal
source        test report, table 4.2, p. 4

limit         46.0 dBµV/m   200 µV/m, 216–960 MHz at 3 m, quasi-peak
margin        47.0 − 46.0 = +1.0 dB
result        level exceeds limit by 1.0 dB

Result. On Rev B, under the recorded conditions, the emission exceeds the limit by 1.0 dB. The margin is positive under the convention in Supported rule evaluation.

Limitation. The result describes Rev B only. It does not identify the cause, and it says nothing about other revisions.

B · Blocked comparison

After a layout change, a Rev C bench reading at 216.8 MHz is 44.8 dBµV/m. The question is whether Rev C improved on Rev B.

Condition	Rev B	Rev C	Status
Level	47.0 dBµV/m	44.8 dBµV/m	Recorded
Detector	Quasi-peak	Peak	Incompatible
Distance	3 m	3 m	Matches
Polarization	Horizontal	Horizontal	Matches
Operating mode	Recorded	Not recorded	Missing

Result. Comparison blocked. The detectors differ and the Rev C operating mode is not recorded. The 2.2 dB difference is shown but not treated as an improvement.

To unblock. Retest Rev C with a quasi-peak detector and record the operating mode, or document why the difference does not affect the reading.

Limitation. Even a valid comparison showing a lower level on Rev C would not by itself confirm the cause of the original emission.