Stopwatch and Timer Calibrations - Aclass

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◆ Stopwatch and Timer Calibrations vi
TABLE OF CONTENTS Table of Contents ◆ List of Figures .....................................................................................ix List of Tables ........................................................................................x 1. Introduction to Stopwatch and Timer Calibrations ..........1 1.A. The Units of Time Interval and Frequency ................1 1.B. A Brief Overview of Calibrations ...............................3 1.C. Traceability and Coordinated Universal Time (UTC) ...................................................................5 2. Description of Timing Devices that Require Calibration ..............................................................9 2.A. Stopwatches ................................................................9 2.A.1. Basic Theory of Operation ............................ 11 2.B. Timers ..........................................................................13 2.C. Commercial Timing Devices .....................................14 3. Specifications and Tolerances ..........................................15 3.A. Interpreting Manufacturer's Specifications..............15 3.B. Tolerances Required for Legal Metrology ...............19 4. Calibration Methods...........................................................21 4.A. Direct Comparison Method .......................................21 4.A.1. References for Direct Comparison Method ......................................21 4.A.2. Calibration Procedure for Direct Comparison Method ...........................25 4.B. Totalize Method ...........................................................27 4.C. Time Base Method......................................................29 vii
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Stopwatch and Timer Calibrations - Aclass

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