Type B Evaluation of Standard Uncertainty
The Type B evaluation of uncertainty involves estimating the quantity u^2j, which may be taken as an approximation to the
Rejection of an Instrument Received for Calibration
If the pooled variance of certain type of instruments is already known, then the particular instrument received for calibration may
Fixing Maximum Permissible Error of an Instrument
Having known the pooled variance of an instrument, its maximum permissible error may be fixed. For an instrument, the maximum
Maintenance of Laboratory Instruments
Maintenance of Laboratory Instruments , For ensuring the good working of a measuring instrument, not only its calibration but also
Testing the Authenticity of Observations
Standard deviation S , the square root of pooled variance, may also be used for testing the authenticity of the
Uses of Pooled Variance
Estimation of Type A Uncertainty of an Instrument In the following paragraphs, an example has been cited for justification and
Pooled Variance
Pooled variance is the arithmetic mean of a number of variances. Due consideration is being given to their respective degrees
Numerical Example for Calculation of Type A Evaluationof Standard Uncertainty
Let us consider a case of measurement of mass of a 1 kg mass standard. Observations after applying buoyancy and
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