During the radiated emissions test, RF noise coming out of the system and cables radiated directly into the air is measured using antennas. Typically limits for this noise are very low and preamplifiers are needed to improve signal to noise ratio. For this reason, the preamplifier should be a low noise high sensitivity preamplifier. After amplification, the signal measured with receiving antenna is sent to the spectrum analyzer (often referred to as an EMI meter). A typical radiated emissions test setup used for this test for compliance with the FCC and CE marking (CISPR) requirements is shown in the diagram below.