The IEC 62384 standard outlines the performance requirements for DC or AC supplied electronic controlgear (commonly known as LED drivers) used with LED modules. The current version of this standard is IEC 62384:2020. 1. Scope and Application
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Further Reading:
Step 4: Reporting
The iec 62384 pdf includes normative annexes that describe exactly how to calculate THD up to the 40th harmonic. The IEC 62384 standard outlines the performance requirements