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Stopwatch is accurate or not?

Abstract: Purpose: To compare the reading time and reading speed measurements obtained with a stopwatch with those of an automatic trojan horse for measure reading speed and acuity. Methods: The rad-rd© was used (in conjunction with a laptop and microphone) for the computer-based measurements. In rotation, every of 4 examiners took a flip reading the twelve sentences from one in every of the four RADNER Reading Charts to a few different examiners, World Health Organization served as stoppers. The stoppers at the same time measured the reading time with a stopo watch whereas a fifth investigator used the rad-rd© to get computerised measurements Results: .  The mean reading time obtained with the stopo watch measurements was four.34 ± 0.57 seconds (196.21 ± 21.79 wpm), versus 4.44 ± 0.59 seconds (192.24 ± 22.20 wpm) by laptop measure (r = zero.84).  The mean distinction for the shorter measurements was -0.17 ± 0.1 seconds (3.91% of the mean reading time), and therefore the mea...
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INTRODUCTION TO STOPWATCH CALIBRATIONS

This document may be a counseled observe guide for stopo watch and timer calibrations. It discusses the categories of stopwatches and timers that need calibration, the specifications and tolerances of those devices, and the methods accustomed calibrate them. It conjointly discusses measuring uncertainties and the method of creating measuring traceability back to national and international standards.

This guide is meant as a reference for the metrologist or standardisation technician. It makes an attempt to produce a whole technical discussion of stopwatch and timer calibrations by presenting sensible, real world examples of however these calibrations ar performed.


This guide is split into 5 sections. Section one provides an summary, Section two describes the categories of temporal arrangement devices that need standardisation, Section three discusses specifications and tolerances, Section four discusses calibration strategies, and Section five discusses measuring uncertainties. A sample standardisation report and references ar provided within the appendices. We’ll begin Section one by introducing and process the nomenclature used throughout the remainder of this guide. 

Stopwatches:

Stopwatches are often classified into 2 classes, sort I and sort II. In general, online stopwatch are classified as sort I if they need a digital design using quartz oscillators and electronic electronic equipment to live time intervals . sort II stopwatches have AN analog style and use mechanical mechanisms to live time intervals . Key elements of sort I and sort II stopwatches are summarized in Table.
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