The Keysight/Agilent N6710A is the base model and the starting point of a build-to-order system that is shipped as a fully tested and assembled multiple-output power supply. The N6710A base model system consists of 1 N6700A mainframe and comes with no standard modules. To select which modules you want, the modules are ordered as options to the N6710A base model system. You can specify from 1 to 4 modules to be installed. You must specify at least one module.