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This Commercial Item Description (CID), describes a current-voltage standard for DC voltage ratio accuracy. The current-voltage provides internal switching for calibrating the 100 mV, 1V, 10V, 100V and 1000 volt ranges of a voltage calibrator to a 10 volt reference source without changing the lead connections. The current-voltage standard is part of the F-15 AN/TSM-131A Electrical Standards Set (ESS) and is rack-mounted in a transportable operation case. This CID represents a minimum requirements for the F-15 ESS currentvoltage standard in which only those manufacturers who meet or surpass the requirements are qualified per this CID. Equipment covered by this CID may be commercially available equipment modified to the extent necessary to meet the following description. The equipment shall be type III, class 5, style F and color R in accordance with MIL-T-28800.