The Keysight ESA-L1500A (Keysight E4411A) portable spectrum analyzer has been discontinued. It has been replaced by the Keysight ESA-E and ESA-L series spectrum analyzers. Keysight ESA-E and ESA-L series spectrum analyzers Economical and portable, rugged packaging and construction, easy to use Frequency range 9 kHz to 1.5 GHz with frequency accuracy of ±2.0 kHz at 1 GHz (without temperature) Phase noise <= -90 dBc/Hz (10 kHz offset) and residual FM <=100 Hz P-P Resolution bandwidths 1 kHz to 3 MHz Maximum amplitude range -120 dBm to +30 dBm Maximum dynamic range >=78 dB/>=85 dB (2nd/3rd order) Log range 85 dB with 10 divisions on screen 15.8 cm, high resolution, LCD display, continuous background environment alignment