Meaning
A targeted evaluation of a previously certified device focusing on specific modified subassemblies or updated regulatory criteria limits the scope of conformity assessment. When a manufacturer executes a partial retest, they avoid the cost and delay of a full certification campaign. This approach is triggered by minor hardware revisions, such as a component substitution or a revised layout, which do not alter the fundamental radio frequency characteristics.
The test lab focuses solely on the affected parameters, ensuring that the changes do not degrade the overall device performance.
Retesting Criterion
Design modifications dictate which test cases from the original certification suite must be rerun. If a wireless module replaces its onboard filter, a partial retest will focus on spurious emissions and out-of-band performance rather than repeating the electrostatic discharge testing. Regulatory bodies define clear boundaries for when this limited pathway is acceptable, based on the potential impact on co-location and output power.
This method prevents unnecessary repetitive testing while maintaining the safety of the radio network.
Detailed Analysis
Detailed analysis of the modified circuitry establishes the technical justification for a limited testing scope. Engineers compare the block diagram and schematics of the original design with the new layout to identify the affected signal paths. If the modified area lies entirely within the power supply regulation stage, the radio parameters are unlikely to change, suggesting that only conducted emissions need re-evaluation.
This risk assessment must be documented thoroughly, as the certifying body relies on the engineering justification to approve the partial retest strategy. By presenting a clear delta analysis, the manufacturer ensures that the test laboratory runs only the essential test sweeps, saving both time and financial resources.
Handover Document
The test laboratory compiles the results into a supplementary test report that refers back to the original full certification file. This document verifies that the modified equipment continues to comply with the relevant regional standards. Once the certification body accepts the supplementary report, they issue an updated grant of authorisation.
This final approval allows the manufacturer to ship the updated version of the product without changing the registered product identifier.
