Test results of simulated satellite slip ring experiments

Experimental data pertaining to the long-term study of satellite data transmission slip ring noise generating phenomena is reported. Detailed test data from a 7,700-hour and an 8,100-hour experiment are included. Both average value and instantaneous data are presented of ring/brush electrical contact resistance, ring/brush micromotions and ring/brush frictional forces. Interrelationships among these parameters are examined in an effort to understand the mechanisms of performance degradation. Results will be utilized to indicate further areas of experimentation which may lead to the improvement of data transmission slip ring performance. Suggestions are made for possible techniques to lower data transmission error rates through satellite slip rings. A microprocessor, which provides monitor and control capability, allows unattended operation as well as selective data acquisition through a set of variable parameter acceptance limits. Modifications and additions to the microprocessor software and data acquisition system, originally presented at the 26th International Instrumentation Symposium, are also reported.