Ten-Bit Resolution PCM Encoder (Falling Sphere Experiment)

摘要

A miniature PCM encoder with 10-bit resolution was developed for use on the falling sphere experiment. Use of CMOS logic elements and an internal power supply resulted in a compact light-weight unit with minimal power demand suitable for use in the 10-inch diameter instrument, for measurement of atmospheric density. A bi-phase level coded system is used, with data input capability of fifteen bipolar (plus or minus 5vdc) analog data lines, each sampled 125 times per second. Subcommunication of up to seven housekeeping monitors (each 0 to +5 vdc, analog level) is also included. Details of circuit design and test evaluation of the prototype unit are covered; the report is written to serve as a technical manual for the equipment, and also covers an associated test set. (Author)