The HP E4405B spectrum analyzer operates between the 9 kHz to 6.7 GHz freqency range, offers +/- 1 dB amplitude accuracy, 40 updates /sec measurement speed (including over the GPIB), optional 10 MHz res. bandwidth filter, 99 dB third order dynamic range, ruggedized field case for portability, six-slot option card cage for easy upgradeability, split screen, segmented sweep, variable sweep (trace) points from 101 to 8192 points and one-button measurements such as ACP, Occupied BW, Emissions BW, channel power, 10 peaks table and and harmonic distortion provide faster and more repeatable results. The frequency range is 9 kHz to 6.7 GHz.