The Advantest R4136 is a spectrum analyzer that uses synthesized local oscillators and high-frequency instrumentation technology, which together make the instrument capable of analyzing spectrum with high stability. The instrument has various types of basic performance capabilities. These include: a wide frequency range from 0.5 kHz to 23GHz (the range can be extended with an external mixer); a wide input range from -131 dBm to +30 dBm; high resolution up to a maximum of 30Hz; a residual FM level below 30 hzp-p (frequency less then or equal to 7.5 GHz, span  less then or equal to 2MHz); proximity noise response of -95.5 dBz/Hz (at a frequency of 20 GHz, 20kHz off the carrier); a dynamic range from 3.5 GHz to 23 GHz at 100dB; and so on. the instrument also enables high accuracy frequency counting, occupied bandwidth measurement (option), and adjacent-channel leakage power measurement (option). A memory card option, in addition to the standard GPIB fill-remote control function, enables programming of panel operations, storage of programs using IC cards, and automatic measurement in solation from a host system.