METROLOGY - CALIBRATION

Lydia Barnes
Mind Map by Lydia Barnes, updated more than 1 year ago
Lydia Barnes
Created by Lydia Barnes about 3 years ago
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Undergraduate Metrology (National Measurement System) Mind Map on METROLOGY - CALIBRATION, created by Lydia Barnes on 11/30/2016.

Resource summary

METROLOGY - CALIBRATION
1 WHAT IS THE PURPOSE OF CALIBRATION
1.1 To provide confidence about a measurement instrument's accuracy and repeatability
2 Calibration should be traceable via UKAS accreditation
3 WHAT IS CALIBRATION ABOUT?
3.1 the instrument
3.2 information handling
3.3 data analysis
3.4 intervals
3.5 Uncertainties/error analysis
3.5.1 error due to calibration should be a maximum of 10% or permissible error of the instrument or measuring process being calibrated
3.5.1.1 1:10
3.5.1.2 10X rule
3.6 environment
3.7 people
4 More accurate = More expensive
5 Can never measure the true exact value except in CAD
5.1 Equipment has a tolerance
5.1.1 Out by 10 micrometres
5.1.2 If we know the tolerance we can compensate
6 CALIBRATION ENVIRONMENT
6.1 difficult to control
6.2 Is a function of
6.2.1 Temperature
6.2.2 Humidity
6.2.3 electrostatic fields
6.2.4 Human interaction
6.2.5 pressure
6.2.6 vibration
6.2.7 Electromagnetic fields
6.3 Calibrator must be aware of all potential sources of error
7 Stability is required to process many measurements across time
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