VERNIER CALIPER

                            VERNIER CALIPER 

VERNIER CALIPER

IT IS A MEASURING INSTRUMENT THAT CONSIST OF THE MAIN SCALE WITH A FIXED JAW AND A SLIDING JAW WITH AN ATTACHED VERNIER USED TO READ, DIRECTLY THE DIMENSION OF AN OBJECT REPRESENTED BY REPARATION BETWEEN INNER AND OUTER EDGE OF THE TURN JAWS

WHEN A LENGTH IS MEASURED THE ZERO POINT ON THE VERNIER SCALE THE ACTUAL POINT OF MEASUREMENT, HOWEVER, THIS IS LIKELY TO BE BETWEEN TWO MAIN SCALE POINTS. THE VERNIER SCALE MEASUREMENT WHICH CONTSPONSIS TO THE BEST-ALIGNED PAIR OF VERNIER AND MAIN SCALE GRADUATION YIELD THE VALUE OF THE TIMES ADDITIONAL PRECISION DIGIT.

LEAST COUNT

LEAST COUNT OF VERNIER CALIPER = VALUE OF +- MAIN SCALE DIVISION
                                                                               TOTAL VERNIER SCALE DIVISION       

A VERNIER SCALE IS CONTRACTED BY TALKING 49 MAIN SCALE DIVISIONS (MSD) DIVIDING THEM INTO 50 DIVISIONS

i.e.....

49 mm DIVIDED INTO 50 PARTS

1 VSD = 49/50 = 0.98mm

1 MSD = 1mm

 LEAST COUNT = 1 MSD - VSD                       1/50 = 0.02mm

LEAST COUNT = 1 - 0.98 = 0.02 mm

PRINCIPLE:-

THE PRINCIPLE OF VERNIER CALIPER( FOR ANY VERNIER SCALE) IS TO DIVIDE A GIVEN DISTANCE INTO n AND n+1 DISTANCE WITH EACH SCALE WITH RESPECT TO THE OTHER. MATCHING UP THE MARKS ON EACH SCALE THEN GIVEN ON 1/N INCREMENT OF ADDITIONAL ACCURACY IN THE MEASUREMENT.

SOURCES OF ERROR AND PRECAUTIONS

1. MOTION OF VERNIER SCALE ON THE MAIN SCALE SHOULD BE MAID.

2. VERNIER CONSTANT AND ZERO ERROR SHOULD BE CAREFULLY FOUND AND PROPERLY RECORDED.

3. THE BODY SHOULD BE GRIPPED BETWEEN THE JAWS FINALLY BUT GENTLY.

4. OBSERVATION SHOULD BE TAKEN AT RIGHT ANGLE AT ONE PLACE AND TAKEN ATLEAST AS THREE DIFFERENT PLACES.

SOURCES OF ERROR

1. THE VERNIER SCALE WAY TO LOSE ON YTHE MAIN SCALE

2. THE JAWS MAY NOT BE AT RIGHT ANGLE TO THE MAIN SCALE

LEAST COUNT(L.C) =     SMALLEST DIVISION OF THE MAIN SCALE

                                         TOTAL NUMBER DIVISION OF VERNIER SCALE

1/50 = 0.02 mm