Errors in Measurement :

Error = Measured Value – True Value

Em = Vm – Vt

  1. Absolute Error :

01Errorsinmeasurementabsoluteerrorgreateraccuracyandprecision.gif

            True absolute error :

= Result of measurement – True Value

            Apparent Absolute error :

= Result of measurement – Arithmetic Value

  1. Relative error :

It is defined as the results of the absolute error and the value of comparison used for 450

calculation of that absolute error.

01Relativeerrorpercentagerelativeerrorabsoluteerror.jpg

Causes of Errors :

  1. Calibration Error:

These are caused due to the variation in the calibrated scale from it’s normal value.

01Errorcalibrationtestcalibrationofgaugescalibrateainstrumentbyastandardgaugepanametricsndt_Cali.jpg

  1. Environmental Error :

These are caused due to humidity condition,Temperature and altitude.

  1. Assembly Error:

i. Displaced Scale (incorrect Fitting)

ii. Non –uniform division of the scale.

iii. Due to bent /distorted pointer.

01Parallexerroreyefaultdefectbyhumanbiaserror.gif

  1. Random Error:

Naturally Occurred

No specific reasons

  1. Systematic errors (or) Bias errors:

These are caused due to repeated readings.

01-Errors-Types Of Error-Systematic Error-Random Error-Bias Error

  1. Chaotic errors :

These are caused due to vibrations,noises and shocks.

Read More:   ENGINEERING METROLOGY | BASIC CONCEPTS OF MEASUREMENTS | METHODS | TERMS OF MEASUREMENT

Errors | Errors in Measurement | Absolute Error | Relative Error | Causes Of Calibration

Leave a Reply