Question

How do you find the zero correction?

Answer 1

Explanation:

Procedures to find out the zero correction are as:

1. Zero correction is the error that does not return zero when the instrument is kept at the rest. Also, say that zero error is the calculation that removes the zero error to get an error-free result.
2. The zero correction uses a screw gauge which has a circular scale and the main scale. On the main scale, there is a reference line.
3. The circular scale of the screw gauge is rotated to maximum capacity and if the reference line on the main scale coincides with the zero of the circular scale there is no error on the screw gauge.
4. If the zero on the circular scale is below the reference line then the error is positive. If the zero on the reference line is above the reference line then the error is negative.

Therefore zero correction can be done by adding the same number of the zero error but with the opposite sign.