Re: Hi Daddy Bill...may I ask where you got your info in scales. Do you know this for a fact or is it just "understood" that they are accurate? -- DietLowCarb.com

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Date Posted: 07:15:14 06/01/02 Sat
Author: Daddy Bill
Subject: Re: Hi Daddy Bill...may I ask where you got your info in scales. Do you know this for a fact or is it just "understood" that they are accurate?
In reply to: Octobersan 's message, "Hi Daddy Bill...may I ask where you got your info in scales. Do you know this for a fact or is it just "understood" that they are accurate?" on 21:34:27 05/31/02 Fri

HI, Octobersan -

Before I retired, I was a "Developmental Project Director" in "Instrumentation Research and Development" at a large aluminum corporation. We tested and developed measurement systems for our plants.

Most weight scales we tested were reasonably accurate, relatively speaking. Though they may be off-calibration by a pound ot two, depending on the quality and range of the unit, they provide a good comparison for weight change.

The "spring" types were the least accurate because the springs age and lose tension. They are also the most temperature sensitive. Most of the latest electronic scales use thin film pressure sensors, which are highly repeatable in their readings. That is, they will read very nearly the same every time using a calibrated weight. The calibration of the scales to "absolute" is done once the linearity is established.

This linearity and hesteresis, (repeatability) is the most important quality of any instrument. The new digital home scales use pressure sensors and a long lasting battery. (My weight scale is a "THINner," model MS-7400 which has a ten year lithium battery. It has a small computer chip that takes dozens of readings and averages them to read out in pounds to the nearest half pound. This makes it very repeatable even on a rug. The cost? Less than $40.

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