#Vernier caliper reading how to#
#Vernier caliper reading plus#

So the distance between the ends of the object plus the length of five divisions of vernier is 2.5 cm. Distance from the other end of the object (at zero of vernier) to the coincidence point is equal to five division lengths of the vernier. It is the fifth vernier division in the figure.ĭistance from one end of the object (at zero of main scale) to the coincidence point is 2.5 cm. Vernier coincidence is the division of vernier which coincides with one of the divisions of the main scale. Main scale reading is the reading just to the left of the vernier zero. In the Animation each main scale division is assumed to be 1 mm. Convince yourself that two scales of unequal division lengths can be used together to make measurements with greater accuracy. Mean diameter (D) = 2.29 cm Radius of the cylinder (r ) = D/2 = 2.29 /2 = 1.145 cm Area of the cross-section of solid cylinder = π r² =3.14 (1.145)² cm² Area of the cross-section of the solid cylinder will be =4.Animation illustrates the principle of Vernier calipers.Ī nice tool where measurements less than that of a division of one scale are measured using two scales of different division lengths. No of vernier divisions coinciding with the main scale divisions ( n) Least count (LC) = 0.1 mm = 0.01 cm Suppose zero error is = 0.7 cm which is a positive error so: Zero correction ( ZC ) = -0.07 cm No of Obs Take at least two readings by inserting the cylinder cross-section-wise between the jaws and get the average diameter.

Apply zero correction to obtain the correct diameter.

Add the values ‘M ‘ and ‘X ‘ to the observed value (Y) of diameter.

Multiply this “n” with the least count and calculate the value of fraction (x) which is to be added in the main scale reading.

Note the vernier division (n) which exactly coincides with any one division of the main scale.

Record this value as the main scale reading (M).

Note the main scale division which is either coinciding or is on the left of the vernier scale zero.

Hold the cylinder between the two jaws of the vernier caliper.

Close the jaws to check the Zero error and calculate the zero correction. We can learn about the use of V.C with the help of an example by measuring the area of the cross-section of a solid cylinder by measuring its diameter with a Vernier caliper.

#Vernier caliper reading how to#

Read also: Types of errors in physics How to read a vernier caliper? Since the zero error is positive, the zero correction will be negative. Positive zero error If the zero of the Vernier scale is to the right of the zero of the main scale then the error is positive.

Since the zero error is negative, the zero correction will be positive. Negative Zero Error If the zero of the Vernier scale is to the left of the zero of the main scale then the error is negative. Otherwise, the instrument has an error called zero error. When the jaws of Vernier calipers are brought into contact, the zero of the Vernier must coincide with the zero of the main scale. L.C = 1 mm – 0.9 mm =0.1 mm There is another method to find the least count which is given as: Least count of vernier caliper formula It is the difference between one main scale division which is 1 mm and one vernier division which is (0.9). The smallest reading which can be accurately measured with a vernier caliper is called its least count (L.C), it is also known as the vernier constant.