Switchable 10-Bit PCM Decoder.

摘要

This report describes a portable, self-contained switchable 8-channel 10-bit PCM decoder, designed as a complementary item of dedicated test equipment for use in checkout and qualification testing of airborne PCM encoders, constructed for use in the 'falling sphere' class of atmospheric density experiments. The system provides 8 channels of analog output data, suitable for use in stripchart recording. Six of these channels are switchable to any desired digital word within the data stream; one switchable channel is additionally provided with a 10-bit binary display for the digital data in the selected word. A second switchable channel also permits decommutation of subcommutated housekeeping data within word 15 of the PCM data. A parallel digital data output is provided to allow interface with automated testing equipment for qualification testing. The report also provides detailed data concerning the computer-controlled automatic temperature qualification test procedure used in certifying the airborne apparatus for flight, including the step-by-step routine to be followed in performing the tests. (Author)