Class II Permissive Change Timelines and Laboratory Fees for Metallic Host Enclosures
Metallic host enclosures alter RF emissions, turning module changes into Class II Permissive filings costing 6000 to 20000 USD over four to eight weeks.
Sample Preparation
Meaning
Procedural steps for configuring a device under test ensure that the physical and functional state of the unit remains consistent throughout the evaluation. Sample preparation involves the installation of specialized firmware and the soldering of test cables to the antenna ports or control interfaces. These modifications allow the laboratory to command the device to transmit on specific channels and at maximum power.
Without this preparation, the device would operate in its normal user mode, which is often unsuitable for regulatory measurement. Proper cable routing and connector selection are part of this process.
Hardware Configuration
Physical access to the internal components is often necessary to attach RF pigtails or power monitoring leads. In sample preparation, the engineer must ensure that these modifications do not majorly alter the electromagnetic profile of the device. Grounding the shields of the test cables is a common requirement to prevent them from acting as antennas.
The integrity of the physical sample is checked before it is placed in the test chamber.
Software Provisioning
Test firmware provides a direct interface for controlling the radio parameters of the device. During sample preparation, the standard operating system is often replaced or supplemented with a test tool that can toggle between different modulation schemes and data rates. This software must be compatible with the hardware version of the sample to avoid data errors.
The version of the firmware used during testing is recorded in the final report to ensure traceability.
Operational Readiness
A final check confirms that the sample functions correctly after the modification process. Effective sample preparation includes verifying that the device can sustain the high duty cycles required for peak power measurements. If a sample fails during testing due to poor preparation, the entire sequence may need to be restarted.
Reliable samples are the foundation of a successful certification campaign.