How to calculate zero error in vernier caliper?
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Zero error: The error that arises in measuring instruments due to non-coincidence of zeros on different scales is called zero error.
When the two jaws are in contact, if the zero of the vernier coincides with the zero of the main scale, then the instrument has no error.Otherwise the instrument has zero error and correction should be applied to every measurement made with the instrument.
Note: While joining the jaws the zero of the vernier moves towards zero of the main scale.
Zero error is of two types.
1. Positive error and 2. Negative error
Positive error: When the jaws are joined together if the zero of the vernier has not reached the zero of the main scale, then the zero error is positive.
Correction: If the vernier coincidence is x in this case, then a correction of ( x x least count) should be subtracted from the observed length to get the correct length.
Negative error: When the jaws are joined together, if the zero of the vernier has crossed the zero of the main scale, then the zero error is negative.
Correction: If the vernier coincidence is x in this case, then a correction of ((n-x)x least count) should be added to observed length to get the correct length. (Here n is the number of divisions on vernier scale)
thanks
When the two jaws are in contact, if the zero of the vernier coincides with the zero of the main scale, then the instrument has no error.Otherwise the instrument has zero error and correction should be applied to every measurement made with the instrument.
Note: While joining the jaws the zero of the vernier moves towards zero of the main scale.
Zero error is of two types.
1. Positive error and 2. Negative error
Positive error: When the jaws are joined together if the zero of the vernier has not reached the zero of the main scale, then the zero error is positive.
Correction: If the vernier coincidence is x in this case, then a correction of ( x x least count) should be subtracted from the observed length to get the correct length.
Negative error: When the jaws are joined together, if the zero of the vernier has crossed the zero of the main scale, then the zero error is negative.
Correction: If the vernier coincidence is x in this case, then a correction of ((n-x)x least count) should be added to observed length to get the correct length. (Here n is the number of divisions on vernier scale)
thanks
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When the jaws of Vernier callipers are closed and is at its initial position and it still shows negative reading rather than giving actual reading of 0.00mm, this is termed as negative error. It is an indication that a measuring system gives a wrong reading when the true value of a measured quantity is zero, for example in a laboratory a voltmeter shows certain quantity of voltage even though no supply is given to it.
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