The DRFS is typically directly connected to a RF receiver or spectrum analyzer using the SMA connector on the top of the unit. The amplitude of the harmonics will vary at different frequencies depending on the fundamental frequency selected and the observation frequency. However, at all specified frequencies the RF level will be well above the specified radiated limits, allowing users to easily compare signal levels with previous/subsequent tests, without the need to be concerns about the receiver noise floor.

The DRFS fundamental frequencies are 10 MHz, 64 MHz, 100 MHz, and 133 MHz. The fundamental frequency also indicates the step size of the harmonic frequency. Higher fundamental frequencies will results in higher harmonic energy at high frequencies.