The Keysight / Agilent / HP 8591A has a frequency range of 9 kHz to 1.8 GHz and amplitude range of -115 to +30 dBm. This instrument has a standard 7.5 ppm frequency accuracy that can be improved with an optional precision frequency reference to marker count accuracy of ± 230 Hz at 1 GHz or ± 2.3 kHz at 18 GHz.

These performance analyzers share the same ease-of-use features found in the lower-cost HP 8590B and 8592B. In addition, each performance portable comes with a built-in memory card reader that enables you to load HP's custom measurement personalities and measurement data into the spectrum analyzer using 32-Kbyte memory cards. A catalog function allows you to determine the exact content of information stored on your memory cards or within internal memory.