INSPECTION
AND
QUALITY
CONTROL
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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
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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