Manufacturer's Specifications:

Voltage (L-L) : 0.8f colts

                        150V rms max.

Frequency Range (within accuracy): 400 - 1600

Frequency Range (useful): 50-10kc

Nominal Input Impedance ( at 400 cps): Synchro Mode: 500K

                                                                         Resolver Mode: 750K

Accuracy: 2 seconds of arc

Features:

• Single unit for resolvers and synchros
• Accuracy 2 seconds
• Resolution 0.0001°
• Constant Null Voltage Gradient

Description:

The Series 540 Resolver / Synchro bridges provide in a single compact 3-1/2" rack-mounted instrument, 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 series 540 will accommodate synchros and resolvers operating at any of the standard voltages, such as 115/90 or 26/11.8 VAC. Their high input impedance and ability to measure synchros and resolvers either as components, or as elements of operating systems, permit them to be used with equal accuracy in the laboratory, on the production line, or in ground checkout systems.

Accuracy of 2 seconds for all angular positions is achieved through use of a unique bridge, developed at North Atlantic for this application. Null voltage gradient is constant over the entire range of angle, permitting use of the instrument for rapid deviation measurements on the producation line or in systems evaluation. 

The series 540 is designed for full accuracy at any fequency from 400 to 1600 and is useful over the extended band of 50 to 10kc with somewhat reduced accuracy. Both input and output are isolated to provide high common mode rejection and to permit the use of any North Atlantic Phase Angle Voltmeter as the null indicator.