DESCRIPTION AND OPERATING INSTRUCTIONS FOR A 7-CHANNEL TELEMETRY SYSTEM FOR PHYSIOLOGICAL TEMPERATURES AND THE ELECTROCARDIOGRAM.
Final rept. 1 Jan-1 Jul 66,
AEROSPACE MEDICAL RESEARCH LABS WRIGHT-PATTERSON AFB OHIO
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Previous telemetry designs were improved to produce a system specific to the physiological evaluation of the thermal adequacy of space suits. A small seven-channel pulse duration multiplexed telemetry system which transmits an electrocardiogram, rectal temperature with an accuracy better than or - 0.05C, and five skin temperatures with an accuracy better than or - 0.2C was constructed. The entire unit is enclosed in a 13 by 10 by 5 cm box worn under the space suit. Components that have become available since construction could reduce this size to one-fifth without sacrificing performance. Three mercury batteries 12 v power the equipment for 40 hours and provide reliable reception at distances of 90 m. The system is activated by connecting the sensor harness, and the output is checked and calibrated by a 3-position switch. The unit has been tested during exercise studies in space suits and during metabolic experiments on men exercising in cold environments. It provided reliable transmission of accurate temperature and heart rate data for both laboratory and field studies. It has simplified experimental procedures by eliminating all complications of hard wire leads penetrating pressure shells in space suits and by completely freeing the subject in field studies. Author
- Stress Physiology
- Biomedical Instrumentation and Bioengineering