Testing Energy Standards
In order to properly maintain a chain of standardization, energy reference standards must be periodically tested, or certified against other reference standards of higher accuracy class. Reference standards should be certified at least one time per year. Field or working standards should be certified more often.
Radian offers reference standards with various accuracy classes and applications. For the ultimate in standards testing accuracy and efficiency, Radian Laboratory Calibration Systems are the ideal choice. The RD-22 Primary Transfer Standard is the most accurate sensing standard that Radian offers, and is one of the most accurate standards in the world. The RD-22 can either be used stand-alone with third party voltage and current sources, or as the primary reference to Radian's RS-933 Power & Energy Automated Calibration systems to provide the ultimate AC Metrology Laboratory.
Secondary Standards are used for testing working or field standards. The RD-21 Portable Reference Standard serves as the definitive secondary standard. It can be used to test field standards or standards inside of meter test boards. The RD-21 can also be used as primary watthour reference standards. A set of three RD-21standards is typically used in this primary standard application.
Testing field standards against a secondary standard is simplified by using a comparator. If the field standard is external to a test board or test kit, an RM-111 Automated Comparator can be used to facilitate the testing of that standard. The RM-111 also enables three standards to be used as a single reference set by averaging their three respective outputs. A three phase standard can also be simulated from three singlephase standards by use of the RM-111. The RD-22 and RD-21 standards have a built in comparator option that allows for the testing of standards. However, these standards are also supported by the RM-111.