What is a zero error? How zero error is corrected? OR What do you understand by the zero error of a measuring instrument? Why is the use of zero error necessary in a measuring instrument?
Zero Error and Zero Correction:
To find the zero error, close the jaws of Vernier Calipers gently. If the zero line of the Vernier scale coincides with the zero of the main scale then the zero error is zero. Zero error will exist if zero lines of the Vernier scale is not coinciding with the zero of the main scale.
Positive zero error:
Zero error will be positive if the zero lines of the Vernier scale are on the right side of the zero of the main scale. | To get the correct value zero error must be recorded and subtracted from each reading.
Negative zero error:
Zero error will be negative if the zero lines of the Vernier scale are on the left side of zero of the main scale.
To get the correct value zero error must be recorded and added to each reading.
Quick Quiz
1. What is the least count of the Vernier Calipers?
Ans: The least count of the Vernier Caliper is 0.1 mm or 0.01 cm.
2. What is the range of the Vernier Calipers used in your Physics laboratory?
Ans: The range of the Vernier Calipers used in your Physics laboratory is 12 cm.
3. How many divisions are there on its Vernier scale?
Ans: Vernier scale has 10 divisions over it such that each of its divisions is 0.9 mm.
4. Why do we use zero correction?
Ans: Zero correction is used to get a correct and exact measurement.
DIGITAL VERNIER CALLIPERS
Digital Vernier Calipers have greater precision than mechanical Vernier Calipers. The least count of Digital Vernier Calipers is 0.01 mm.
