Modular DC electronic load mainframe. Keysight N3300A DC Electronic Load Mainframe is designed for professional EMC testing workflows, delivering reliable performance for emissions and immunity evaluations. Typical applications include pre-compliance, debug, and certification support across automotive, aerospace, medical, and industrial sectors. Engineered for accuracy and repeatability, it integrates smoothly with lab automation and common EMC standards. Keywords: EMC testing, EMI/EMS compliance, RF immunity, radiated & conducted emissions, IEC/EN 61000, CISPR.