Evolution of the original AT5005/AT5006 has led to the new AT5010/5011 Spectrum Analyzer/Tracking Generator which now extends operation over 1 GHz. Both fine and coarse center frequency controls, combined with a scan width selector provide simple frequency domain measurements from 100kHz/div to 100MHz/div. Both models include a 4 1/2 digit numeric LED readout that can selectively display either the center or marker frequency.