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Reading Micrometer and Vernier Calipers
Micrometer
Zero Error for Micrometer
No zero error
This micrometer has zero error.
The zero marking on the thimble is below the datum line. So this micrometerhas a positive zero error.
How do we count the zero error?
In this case we will take the reading on the thimble.
Thimble reading = 0.03 mmSo the micrometer has a zero error of +0.03 mm.
Whatever reading we take on this micrometer we would have to subtract +0.03 mm
The zero marking on the thimble is above the datum line. So this micrometerhas a negative zero error.
In this case we will have to count the number of divisions on the thimble between the zero marking and the datum line.
No. of divisions = 3 Measurement of each division = 0.01mmSo the micrometer has a zero error of -0.03 mm.
Whatever reading we take on this micrometer we would have to subtract -0.03 mm
Vernier Calipers
