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changes.mady.by.user Jana Ihrens

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changes.mady.by.user Finn Klar

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Comment: Reverted from v. 30


Info
For this experiment, it is not necessary to use your own laptop (other than to take notes).

1.      Context of the Experiment

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  • Knowing: uncertainty, complete measurement, errors, steps in handling calipers
  • Abilities: calculate uncertainties and absolute/relative errors, handling calipers, choosing the correct measurement instrument
  • Understand: measurement accuracy and being able to assess it, review of measurement method

3.      Literature

Necessary further reading: how to use a caliper!, error propagation, rounding to significant figures!:

[1] DIN 1319-4. Grundlagen der Meßtechnik. Teil 3: Auswertung von Messungen - Meßunsicherheit (9.2). Ausgabe 2, Februar 1999.

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[5] Lectures: MT-Motivation, Measurement Theory

Necessary further reading: how to use a caliper!, error propagation, rounding to significant figures!


4.      Basics/Fundamentals

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Mathinline
body--uriencoded--Average: x ̅\bar%7Bx%7D=\cfrac%7B1%7D%7BN%7D \sum \limits_%7Bi=1%7D%5e%7BN%7Dx_i=\cfrac%7Bx_1+x_2+x_3+⋯+x_N%7D%7BN%7D
(1)

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Mathinline
body--uriencoded--Uncertainty propagation: u_y=\sqrt%7B\sum \limits_%7Bj=1%7D%5e%7BN%7D \left(\cfrac%7B∂f(x_j)%7D%7B∂x_j )%7D j%7D a_%7Bx_j%7D\right)%5e2 %7D
(3)

A complete measurement result for a statistically determined quantity x is therefore

Mathinline
body--uriencoded--x=M_x \pm u_x = \bar%7Bx%7D \pm \sigma_x
with the measurand Mx and the uncertainty ux.

4.3 vernier caliper gauge

There are four three types of measurements that can be made with a vernier caliper gauge: Inside measurements, outside measurements and depth.
When the vernier caliper is closed, the scale should read exactly 0. To take a measurement of an inside dimension, the jaws of the caliper are now opened until they exactly cover the area to be measured. To measure an outside dimension, the caliper jaws are opened and then closed again until they touch the object. For measuring depths (e.g. drilled holes), the depth gauge at the end of the caliper can be used - the main element of the caliper is pressed against the higher surface and the depth gauge is positioned at the deepest point of the hole.

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  1. Matriculation number
  2. reproducibility
  3. repeatability
  4. instrument accuracy (1.4.1)
  5. complete measurement of the volume of the cylinder 1.4.2
  6. table from 1.5.1
  7. complete measurement result for 1.5.2 volume
  8. number of beans in the container 1.5.3
  9. (free text) explain your measurement steps and the final result of 1.6