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Measuring Distances: Inspection & Quality Control, Summaries of Experimental Physics

An overview of various measuring tools, including rulers, Verniers, and micrometers, used for making measurements of different scales. It covers the principles of reading these instruments, the concept of uncertainty, and the precision levels of each tool. It also discusses the use of a Vernier height gauge and a micrometer, as well as digital alternatives.

Typology: Summaries

2021/2022

Uploaded on 09/27/2022

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ivie 🇬🇧

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INSPECTION
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INSPECTION

AND

QUALITY

CONTROL

Reading and understanding

It is useful for making measurements of distances of

about 10cm or greater.

For an uncertainty of about 1%

 a) A ruler, marked in mm, is useful for making

measurements of distances of about 10cm or greater.

Reading a ruler

 Every measurement is really a subtraction

 6.3(0.05)cm - 2.0 (0.05)cm = 4.3 (0.1)cm

VERNIER - is useful for making measurements of

distances of about 0.02mm or greater.

On this cm scale the reading is 1.23cm

The vernier part of the reading is really a subtraction:

x = d - d' x = 3mm - 3(0·9)mm = 3(0·1)mm

What is the uncertainty?

Smallest measurement on the main scale- Smallest measurement on the Vernier

1 - 0.9 = 0. The reading is written 756.0  0.

VERNIE HEIGHT GAUGE

Reading the micrometer

MICROMETER