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