Keysight Technologies (Agilent HP) Spectrum Analyzers

For applications requiring precise amplitude accuracy, low phase noise, and wide analysis bandwidths, the PSA Series represents a primary benchtop tier. This family includes models such as the E4440A (3 Hz to 26.5 GHz), the E4443A (3 Hz to 6.7 GHz), and the E4448A (3 Hz to 50 GHz). The E4440A provides a typical third-order intercept (TOI) of +19 dBm at 1 GHz and a typical displayed average noise level (DANL) of -155 dBm at 1 GHz. These instruments feature a fine resolution bandwidth (RBW) range from 1 Hz to 8 MHz and support external mixing to extend frequency coverage up to 325 GHz. For legacy setups, the HP 8566B system remains a historical reference, providing continuous sweep from 100 Hz to 22 GHz with exceptional stability and synthesizer accuracy.

The ESA Series is divided into the mid-performance ESA-E and the basic ESA-L configurations. The ESA-E models, including the E4402B (100 Hz to 3.0 GHz) and the E4407B (9 kHz to 26.5 GHz), deliver an overall absolute amplitude accuracy of +/-0.4 dB and typical phase noise of -98 dBc/Hz at 10 kHz offset on a 1 GHz carrier. The ESA-L series, which includes basic configurations like the E4411B-BAS and E4408B-BAS, is optimized for general-purpose utility and service. The E4411B-BAS has a standard 75-ohm input impedance and is designed for quick 5-minute warm-up times. The E4403B-BAS covers 9 kHz to 3.0 GHz and provides a TOI of +7.5 dBm, making it a reliable basic benchtop option.

For operations outside the laboratory, Keysight offers portable and handheld solutions. The legacy 8560 Series, including the 8563EC (9 kHz to 26.5 GHz) and the 8565EC (9 kHz to 50 GHz), features ruggedized construction compliant with MIL-T-28800 and synthesized tuning. These portable units feature color LCD displays, fast digital resolution bandwidths from 1 Hz to 100 Hz, and phase noise of -113 dBc/Hz at 10 kHz offset. The 8590 Series, including the 8594E (9 kHz to 2.9 GHz) and the dedicated 8591C Cable TV analyzer (1 MHz to 1.8 GHz with 75-ohm input), provides modular cardcage architectures for custom measurement personalities. Modern field work is served by the FieldFox series; the handheld N9912A weighs 2.7 kg and operates from -10 to +55 degrees Celsius, while the N9344C covers up to 20 GHz in a fanless 3.6 kg enclosure.