Measuring receivers are widely used in Metrology and calibration lab environments, spectrum monitoring and electromagnetic compatibility facilities.
Receivers used for compliance testing must fulfill the basic EMC standard CISPR 16-1-1.
Usually, EMI receivers have a CISPR indication range that starts about 6dB above the noise floor.
A linearity usually demonstrates the performance check for sinusoidal signals and broadband pulses.
Even if called fully compliant, some EMI receivers have a CISPR indication range that starts at higher levels, e.g., 40dBuV.