The Model 540/10 provides the means for measuring directly the angular shaft position of both three-wire synchros and four- wire resolvers to an accuracy of 2 seconds of arc.* In addition to its dual-mode capability, the Model 540/10 will accommodate synchros and resolvers operating at any of the standard voltages up to 115Vac, maximum. Its high input impedance and ability to measure synchros and resolvers either as Components or as elements of operating systems, permit it to be used with equal accuracy in the laboratory, on the production line, or in ground checkout systems.