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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
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For an uncertainty of about 1%
Reading a ruler
Every measurement is really a subtraction
6.3(0.05)cm - 2.0 (0.05)cm = 4.3 (0.1)cm
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
MICROMETER