VXI synchro/resolver and phase-angle voltmeter COTS resources for F-15 AADTS program ATE

This paper describes the Technology Inc (MTI) F-15 AADTS (Analog Avionic Depot Test Station) system and the two NAI, Inc VXI Commercial-Off-The-Shelf (COTS) resource cards it uses: the synchro/resolver simulation and measurement card and the phase-angle voltmeter card. The MTI AADTS ATE system incorporates an open architecture VXIbus-based and GPIB-based design for test and maintenance of F-15 analog circuit cards. It's an upgrade and refurbishment of an older system, designed to allow old test programs and old test adapters to run on it. All of the instruments in the tester are Commercial-Off-The-Shelf (COTS) units, including the NAI Model 5388 synchro/resolver resource and Model 227 phase-angle voltmeter. NAI's model 5388 is a C size VXI COTS Synchro-Resolver Simulation and Angle Position Measurement card. Interfacing to rugged reliable synchros, the 5388 functionality is based upon highly accurate synchro-to-digital conversion and digital-to-synchro simulation. NAI's model 227 is a wideband message-based phase-angle voltmeter, utilizing the latest DSP technology to provide high performance phase-sensitive, frequency selective voltage measurements. The phase-sensitive measurements of in-phase and quadrature voltage, as well as phase angle, can be made at any frequency from 10 Hz to 100 kHz.