Stopwatch and Timer Calibrations - Aclass

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NIST Recommended Practice Guide Special Publication 960-12 Stopwatch and Timer Calibrations Jeff C. Gust Quametec Corporation Robert M. Graham Sandia National Laboratories Michael A. Lombardi National Institute of Standards and Technology Physics Laboratory May 2004 DEPARTMENT OF COMMERCE UNITED STATES OF AMERICA U.S. Department of Commerce Donald L. Evans, Secretary Technology Administration Phillip J. Bond, Under Secretary for Technology National Institute of Standards and Technology Arden L. Bement, Jr., Director i
Page 1: Stopwatch and Timer Calibrations Je
Page 5 and 6: FOREWORD Foreword ◆ Stopwatch and
Page 7 and 8: ACKNOWLEDGMENTS Acknowledgments ◆
Page 9 and 10: TABLE OF CONTENTS Table of Contents
Page 11 and 12: List of Figures Table of Contents
Page 13 and 14: 1. INTRODUCTION TO STOPWATCH AND TI
Page 15 and 16: common for digital stopwatches, but
Page 17 and 18: field calibrations, although labora
Page 19 and 20: Introduction ◆ simply a calculate
Page 21 and 22: 2. DESCRIPTION OF TIMING DEVICES TH
Page 23 and 24: 2.A.1. Basic Theory of Operation Ev
Page 25 and 26: a gear train that divides the speed
Page 27 and 28: Specifications and Tolerances ◆ 3
Page 29 and 30: Specifications and Tolerances ◆ H
Page 31 and 32: Percentage of Watches 40 35 30 25 2
Page 33 and 34: 4. CALIBRATION METHODS There are th
Page 35 and 36: Calibration Methods ◆ Please note
Page 37 and 38: Calibration Methods ◆ UTC(NIST) e
Page 39 and 40: As Table 6 illustrates, the longer
Page 41 and 42: Figure 12. Using the start-stop but
Page 43 and 44: The commercial unit uses a 4.32 MHz
Page 45 and 46: Calibration Methods ◆ which means
Page 47 and 48: 5. MEASUREMENT UNCERTAINTY This cha
Page 49 and 50: 5.A.2. Uncertainty Due to Human Rea
Page 51 and 52: 5.A.3. Device Under Test (DUT) Reso
Page 53 and 54:
Table 10: Uncertainty Analysis for
Page 55 and 56:
Mean Offset (s) 0.05 0.04 0.03 0.02
Page 57 and 58:
The stopwatch is digital and the re
Page 59 and 60:
Measurement Uncertainty ◆ we are
Page 61 and 62:
APPENDIX A: CALIBRATION CERTIFICATE
Page 63:
REFERENCES References ◆ [1] Inter
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Stopwatch and Timer Calibrations - Aclass

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