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  Measurement, Test and Calibration
  Stop Watch Calibration Reality Check

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Author Topic:   Stop Watch Calibration Reality Check
Marc Smith
Cheech Wizard

Posts: 4119
From:West Chester, OH, USA
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posted 05 April 1999 06:47 PM     Click Here to See the Profile for Marc Smith   Click Here to Email Marc Smith     Edit/Delete Message   Reply w/Quote
I thought this was good. You can guess the gist of the previous 'advice' on calibrating a stop watch....

---------snippo---------

Date: Thu, 4 Feb 1999 09:00:00 -0500
From: "Klouse Kenneth P."
To: Greg Gogates
Subject: RE: Re1: Stop Watch Cal (fwd)

Unless I'm missing something, anyone who spends more than 15 minutes calibrating a stop watch, or claims accuracies of .001%, better smell what their peddling, get a life, or start measuring the reflexes of the stop watch operators. I'm not saying that stop watches so not need to be calibrated, I'm saying that one should look at the accuracy needed for the measurement, and calibrate the instrument accordingly. As Jeff Gust so eloquently put it, " As you would note, the random error from the person dominates the uncertainty budget, and in fact is 41 times greater than that of the unit under test tolerances. " If that person hasn't had his coffee that morning or he didn't get enough sleep, his reaction time could be all over the map.

As an assessor of product certification schemes, it is enlightening to read responses from different people on these varied subjects. But sometimes I think we have to step back and see the practicality of what we are doing or requiring.

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Marc Smith
Cheech Wizard

Posts: 4119
From:West Chester, OH, USA
Registered:

posted 05 April 1999 07:30 PM     Click Here to See the Profile for Marc Smith   Click Here to Email Marc Smith     Edit/Delete Message   Reply w/Quote
I sorta figured this also could fit here. Another reality check. What if there is no 'standard'?

----------snippo---------

Date: Sat, 20 Feb 1999 05:54:03 EST
From: Rcveale@aol.com
To: iso25@fasor.com
Subject: Re: Linear Displacement Potentiometer

Pierre,

There are no American nor ISO standards for linear displacement potentiometers. There might me a military standard that I am not aware of.

A group was formed several yars ago to write a standard for linear transducers, and a draft was written; however, it was never finished nor published as a standard. A couple of years ago there was an attempt to revive the Group, but there appeared to be little interest or need for such a standard.

If a need can be shown to exist and someone is willing to put together a group to do the work, there is a procedure in place for producing the standard.

Ralph Veale, Chairman
ASME B89.1 Subcommittee for Length

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