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Keeping Time

Todd May. Keeping Time. Washington State University – Vancouver Mech 304 – Instrumentation and Measurement Fall 2009. List of Topics. What is time? Measuring Non-e lectronically Measuring Electronically Conclusion. What is Time?. Could be called the 4 th dimension

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Keeping Time

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  1. Todd May Keeping Time Washington State University – Vancouver Mech 304 – Instrumentation and Measurement Fall 2009

  2. List of Topics • What is time? • Measuring Non-electronically • Measuring Electronically • Conclusion

  3. What is Time? • Could be called the 4th dimension • Interval between events or states • Time is used everywhere daily • Velocity • Acceleration • Force • Cooking • GPS • Alarm clocks • Appointments • Competitions • Deadlines • This presentation

  4. Non Electronic • Sundial • Water clocks • Works at night • Hourglass • Mechanical • Pendulum • Power sources • Sun • Gravity • Springs

  5. Electronic • Crystals • Most common is quartz • More accurate than mechanical • Atomic • Most accurate • 1 sec = 9,192,631,770 cycles of radiation of the caesium-133 atom • Produce a signal of a specific frequency • All digital circuits use clocks • Digital logic counts cycles www.wholesaleec.com

  6. Conclusion • Electronic • More accurate • Needs a power source • Goes for longer between maintenance • Non-electronic • Needs maintenance more often • Less accurate • Cheaper to run

  7. Questions ?

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