The RSA3000-EMC is an option for the RSA3000 series spectrum analyzers. The feature includes a Quasi-Peak detector and an EMI filter.
When the option is purchased, a code is provided that activates the above features.
Rigol RSA3015N Spectrum Analyzer, 100 kHz - 1.5 GHz
Rigol RSA3030N Spectrum Analyzer, 9 kHz - 3.0 GHz
Rigol RSA3045N Spectrum Analyzer, 9 kHz - 4.5 GHz