Vernier caliper and micrometer caliper lab report PDF

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VERNIER CALIPER – MICROMETER CALIPER

Name: Chel, May Myet Partner’s name: Melissa Finnegan PHY 116 – 13725 Lab number 2 – Vernier Caliper and Micrometer Caliper Date: 09/01/2017 Instructor’s name: Mihaela Drenscko

Objective: To measure the precision of the Vernier caliper and the Micrometer caliper by measuring the different sizes of various samples and appreciate how precise the measurements were made. Principles/laws tested and used: Discussion: This experiment shows how accurate and precise the measurements of a Vernier caliper and a Micrometer caliper are. The accuracy of an instrument is its ability to produce measurements of the same value when measured several times whereas the precision of an instrument is its ability to produce measurements that are close to the true value. Conclusion: Both the Vernier caliper and the Micrometer caliper are precise and accurate instruments. The Vernier caliper has a reading error of ±0.01mm and the Micrometer caliper has a reading error of ±0.005mm. Therefore, the Micrometer caliper is more suitable for measuring smaller samples. Errors: Systemic errors such as instrument error (eg- zero error) cannot be avoided.

Calculations: Average values:

Object

Vernier caliper

Micrometer caliper

Aluminum block

25.3 ± 0.01 mm

25.2 ± 0.005 mm

Aluminum cylinder

13.6 ± 0.01 mm

12.7 ± 0.005 mm

Copper cylinder

13.3 ± 0.01 mm

12.7 ± 0.005 mm

Wire

0.67 ± 0.01 mm

0.95 ± 0.005 mm

Percent error:

Percent error of Vernier

Percent error of

caliper

Micrometer caliper

Aluminum block

0.395%

0.0397%

Aluminum cylinder

0.735%

0.0787%

Copper cylinder

1.955%

0.551%

Wire

34.3%

1.0526%

Object

Questions:

Vernier Caliper 1) It decreases the uncertainty of the measurement by calculating the average value. Multiple measurements attribute to a more precise average value. 2) The smallest division on the Vernier caliper corresponds to 1mm. 3) The error for each measurement is one half of the least count (±0.01mm). Micrometer Caliper 1) The Vernier caliper would not be used since the diameter of a human hair has a small value which the Vernier caliper is not able to measure. The Vernier caliper only have the smallest possible measurement of 0.02mm. 2) It corresponds to 0.5mm. 3) It corresponds to 0.01mm. 4) Metric scale is the world basic standard for measurements and uses measurements from the metric system. It goes in units of ten so it is easier to convert. 5) It means that one complete rotation of the barrel scale accounts for a total of 0.5mm. 6) Zero error occurs when the thimble on the micrometer caliper fails to return to zero after a complete rotation. If that occurs, we have to take in the measurement needed or the measurement that needs to be subtracted for the thimble to return to zero position, in our calculations....