Rohde & schwarz offers instrument family for network analysis, network analyser and spectrum analyser. The r&s zvl network analyzer, with the price of a low-cost instrument, features and performance of a middle class instrument and the weight and form factor of a portable instrument, addresses the entire market for design, production, service and installation. It has a special feature like it combines rf analysis instrument classes in a single box. In the basic version, it is a bidirectional 2-port vector network analyser that measures a out both in the forward and reverse direction, to characterise all four s-parameters. The r&s zvl-k1 option adds a full-blown spectrum analyser with performance similar to the r&s fsl. Along with this , it turns into a power meter by controlling a power sensor of the r&s nrp series.