The Aaronia AG AR 122/041 Spectral Background Mask block removes all spurious or any other signal from the spectrum to offer a perfect clean spectrum to measure your DUT within a noisy RF environment. This block is the perfect tool for a EMI or EMC test without the need of a EMC chamber. Simply let the Spectral Background Mask block remove all noise, spurious RF emissions etc. around you by recording those and setting up an intelligent filter mask against them. After the recording switch to the mask max mode and you will get a clean spectrum without any disturbing noise. Now activate your DUT and you will get the RF emissions of the DUT only without any disturbing RF. The user may have some quite strong LTE signals and want to eliminate those since our DUT will operate within the same frequency band. After recording and automatic filter mask setup we activate the filter mask and now have a clean noise floor with our DUT signals only.