Wrist-worm rate of ascent/descent indicator

摘要: A wrist-worn, real-time-indicating, actual rate of ascent/decent meter includes a non-corrodable, hermetic enclosure with window. display, visible through the window, numeric rate-related indicia and arrows, both clearly against contrasting backdrop. The contrast may be black on silver. hysterisis-free transducer in produces first signals proportional to ambient pressure. are converted second representing depth ambient, latter being periodically sampled. Each sample is compared previous third rate-of-change-of-depth-with-time result from successive comparisons. displayed numerically direction (ascending or descending) indicated by arrows. Signal processing controlled performed microprocessor within enclosure. Facilities provided replace battery turn off without affecting hermeticity