MEASURMENT TECHNIQUES by Sukesh Kamath

Measure lengths using rulers, calipers and micrometers

sukeshkamath — 2016-01-22 05:36:01 UTC

USING RUL

sukeshkamath — 2016-01-22 05:37:56 UTC

USING VERNIER

sukeshkamath — 2016-01-22 05:55:12 UTC

Positive Error in vernier

sukeshkamath — 2016-01-22 06:04:02 UTC

When the jaws are closed and if the reading is 0.10mm, the zero error is referred to as +0.10mm. The method to use a vernier scale or caliper with zero error is to use the formula 'actual reading = main scale + vernier scale − (zero error)' thus the actual reading is 19.00 + 0.54 − (0.10) = 19.44 mm

Negative error in vernier

sukeshkamath — 2016-01-22 06:06:07 UTC

When the jaws are closed and if the reading is −0.08mm, the zero error is referred to as −0.08 mm. The method to use a vernier scale or caliper with zero error is to use the formula 'actual reading = main scale + vernier scale − (zero error)' thus the actual reading is 19.00 + 0.36 − (−0.08) = 19.44 mm

Using Screw Gauge

sukeshkamath — 2016-01-22 06:08:37 UTC

Parallelex Error

sukeshkamath — 2016-01-22 06:29:46 UTC

Calibration curve

sukeshkamath — 2016-01-22 06:31:45 UTC

Record value from instrument

Use calibration curve to read off the corrected “real” value

Errors

sukeshkamath — 2016-01-22 06:46:09 UTC

Random errors : can not be predicted. can be minimised by repeated reading and averaging.

Systematic Errors: Which are the same for each measurement, can be removed by using another instrument.

Uncertainty

sukeshkamath — 2016-01-22 06:52:38 UTC

sukeshkamath — 2016-01-22 07:04:31 UTC

Precision and Accuracy

sukeshkamath — 2016-01-22 07:05:15 UTC

Measure and experience by yourself

sukeshkamath — 2016-02-01 05:39:37 UTC

click the link to measure using vernier.

http://www.radian.com.hk/simulations/index.html#/details/13