different types of errors occurs in measurement.
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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 Errors

 Observational Errors

1) Gross Errors

Gross errors are caused by mistake in using instruments or meters, calculating measurement and recording data results. This may be the reason for gross errors in the reported data, and such errors may end up in calculation of the final results, thus deviating results.

2) Random Errors

Random errors are caused by the sudden change in experimental conditions and noise and tiredness in the working persons. These errors are either positive or negative.

3) Systematic Errors

 Instrumental Errors

 Instrumental errors occur due to wrong construction of the measuring instruments. These errors may occur due to hysteresis or friction. These types of errors include loading effect and misuse of the instruments.

Environmental Errors

 The environmental errors occur due to some external conditions of the instrument. External conditions mainly include pressure, temperature, humidity or due to magnetic fields. In order to reduce the environmental errors

Observational Errors

 As the name suggests, these types of errors occurs due to wrong observations or reading in the instruments particularly in case of energy meter reading. 
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