What is measurement error ?

1 Answer


Measurement error :-

  1. Measurement is the process of comparing unknown quantity with known or standard quantity.
  2. Error is the difference between measured value and true value.
  3. Perfect accuracy measurement is not possible. So, all measurement have some error.
  4. There are Three types of measurement errors.                        

  • Human errors (gross errors)
  • Systematic errors
  • Random errors 

  1. Human error :- Human error or gross error are caused by humans by misreading of instruments, not using instrument in a way for which it was designed. Human error are also caused by calculation mistakes of humans.
  2. Systematic error :- Systematic errors are caused by instrument by inherent inaccuracies of instrument or due to defective parts of instruments. There are two types of systematic errors one is equipment errors and second is environmental errors. Equipment errors are such as defective parts, mis-calibration of equipment and bearing friction etc. and environmental errors are such as change in temperature and change in humidity etc.
  3. Random error :- Random error are caused by variation in parameter or system. By taking multiple times reading may help in minimising effect. Random error is always present in measurement. It is caused by fluctuations in reading measurement apparatus. Random error show different result for same repeated measurement.
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Description : What are the types of error?

Answer : Human error or gross error, systematic error, applicational error and random error are the types of error.

Description : What are the factors influencing measurement errors?

Answer : The factor influencing measurement errors are accuracy, precision, range and bandwidth, sensitivity, resolution and uncertainty.

Description : sketch time period measurement by CRO.

Answer : Horizontal sweep is turned ON and the display appealing on the screen is adjusted by varying different control knobs provided on the front panel of CRO, till the signal is suitably displayed ... Where m=Number of division in one complete cycle n=Setting of time base =Time/Division

Description : different types of errors occurs in measurement.

Answer : Generally errors are classified into three types: systematic errors, random errors and blunders. 1) Gross Errors 2) Random Errors 3) Systematic Errors Instrumental Errors Environmental ... to wrong observations or reading in the instruments particularly in case of energy meter reading. 

Description : tern null as it applies to bridge measurement.

Answer : Null measurements balance voltages so that there is no current flowing through the measuring device and, therefore, no alteration of the circuit being measured. Null measurements are generally more ... the use of standard voltmeters and ammeters, and they still have limits to their precision.

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