measurement

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Derived Units

Back

The units which can be expressed in terms of combination of fundamental units

Front

scalar quantity

Back

A quantity that has magnitude.

Front

vector quantity

Back

A quantity that has magnitude/size and direction

Front

accuracy

Back

value of a measured quantity is one that is close to the true value of the quantity

Front

Precision

Back

Smallest change in value that can be measured by an instrument or operator

Front

Random errors

Back

Readings have positive and negative values around the mean value/peak value / values are scattered / wide range. To reduce errors, take several readings to get an average value.

Front

Systematic Error

Back

the readings are not centred around the true value.

Look/check for zero error to avoid systematic error.

Front

Uncertainty

Back

estimate of difference between the reading and true value of the quantity being measured

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Calibration

Back

Calibration is the comparison of measurement values delivered by a device under test with those of a calibration standard of known accuracy

Front

zero error

Back

caused when an instrument gives a non zero reading when the true value of the quantity is zero.