RE: Tolerance in text

Subject: RE: Tolerance in text
From: eric -dot- dunn -at- ca -dot- transport -dot- bombardier -dot- com
To: "Jonathan West" <jwest -at- mvps -dot- org>
Date: Wed, 22 Feb 2006 09:35:41 -0500

Jonathan West wrote on 02/21/2006 11:09:16 AM:
> No. In that example, (assuming the measuring device has a measurement
> uncertainty of 0.01) the acceptable range of *measured* values is 24.91
> 25.09. Only within that range can you be sure that the measured value
> combined with the maximum measurement uncertainty means that the
> value is within the required range of 24.9 to 25.1.

You're right , and I knew that. Went looking for the text book, but it
wasn't at hand.

There was a full course on measurement tools and how to use them. There
are also a number of CBTs available on the web.

The choice of tool has to be made based on the required tolerances. Then,
the acceptable measured values must take into consideration the worst case
accuracy/precision of the measurement device.

Eric L. Dunn
Senior Technical Writer


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RE: Tolerance in text: From: Jonathan West

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