The Model 530 is a dual-mode resolver-synchro simulator. It generates electrical data of angular shaft position of either three-wire synchros or four-wire resolvers to an accuracy of 2 seconds of arc. The unit meets all requirements for use in providing ideal inputs for testing of synchro and resolver Receiver or systems under test or evaluation which operate from synchro or resolver signals. In addition to its dual-mode capabilities, the unit provides Switch elected line-to-line voltages of 11.8, 26, 90, or 115 volts, from either 26V or 115V input excitation. Consequently, the unit may be used for testing any standard synchros or resolvers, as well as systems utilizing these Components