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The Model 4503 is a remotely controlled (GPIB) AC voltage reference system for applications with automatic test equipment.  It is a highly versatile reference source, designed to meet the needs of  computer system production line testing, ATE systems and standards laboratories.  The unit is also  calibrated with equipment traceable to the National Institute of Standards & Technology.  The 4503  is overload and short circuit protected and is fully operational in normal environmental conditions.