The 8590 E-Series and L-Series spectrum analyzers, 8591C cable TV analyzers, and 8594Q QAM analyzers provide measurement capabilities over the RF and Microwave frequency ranges. The frequency ranges of 8590 E-Series and L-Series spectrum analyzers, 8591C cable TV analyzers, and 8594Q QAM analyzers are described below. All 8590 E-Series spectrum analyzers, 8591C cable TV analyzers and 8594Q QAM analyzers are equipped with a memory card reader. The memory card reader allows the analyzer to use downloadable software programs. The functional “personality” of the analyzer can also be altered using the memory card reader. This feature provides the user with one analyzer that can perform the function of other types of microwave test equipment. Further information about the 8590 E-Series and L-Series spectrum analyzers, and the available options, is provided in Chapter 10, “Analyzer Options and Block Diagrams,” of this service guide and the 8590 E-Series and L-Series Spectrum Analyzers User's Guide. Further information about the 8591C cable TV analyzer and 8594Q QAM analyzer is provided in the spectrum analyzer reference for your instrument. Further information about the 8594Q QAM analyzer is provided in 8594Q QAM Analyzer Spectrum Analyzer Reference User's Guide.