Modular Transmitter Testing Criteria and Host Integration Compliance Rules
Modular approval requires eight statutory hardware conditions; host integrators must perform spot checking and unintentional radiator evaluation before market entry.
Part 15b Compliance
Meaning
Electromagnetic compatibility certification in the United States verifies that unintentional radiators do not emit radio-frequency energy that interferes with authorized communication services. Meeting the rules for part 15b compliance is mandatory for digital devices such as microprocessors and wireless connectivity modules integrated into smart products. This regulatory standard measures both conducted emissions on the power lines and radiated emissions in the surrounding air.
It does not apply to intentional transmitters, which are governed by different sections of the federal regulations.
Testing Environment
Anechoic chambers block external signals. To demonstrate part 15b compliance, the product operates in its typical configuration while antennas measure emissions.
Regulatory Obligation
Hardware manufacturers must perform these emissions tests before distributing any digital product to the general public. Failure to achieve part 15b compliance can result in substantial financial penalties and the forced recall of the non-compliant hardware from the market. The test report must detail the specific measurement equipment used and the calculated margins below the regulatory limits.
These records are kept on file by the manufacturer for the entire life cycle of the product.
Product Certification
The final compliance file contains the complete laboratory report and a formal declaration of conformity from the integration company. Once part 15b compliance is confirmed, the product is marked with the required FCC logo and standard compliance statement on its enclosure or user interface. Quality auditors inspect the labeling during routine packaging verification.
This certificate completes the administrative requirements for commercial launch.