7150671
Description
Mind Map by Lydia Barnes, updated more than 1 year ago
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Created by Lydia Barnes
almost 8 years ago
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METROLOGY - CALIBRATION
- WHAT IS THE PURPOSE OF CALIBRATION
- To provide confidence about a
measurement instrument's accuracy
and repeatability
- To provide confidence about a
measurement instrument's accuracy
and repeatability
- Calibration should be traceable via
UKAS accreditation
- WHAT IS CALIBRATION ABOUT?
- the instrument
- information handling
- data analysis
- intervals
- Uncertainties/error analysis
- error due to calibration
should be a maximum of
10% or permissible error of
the instrument or
measuring process being
calibrated
- 1:10
- 10X rule
- 1:10
- error due to calibration
should be a maximum of
10% or permissible error of
the instrument or
measuring process being
calibrated
- environment
- people
- the instrument
- More accurate = More expensive
- Can never measure the true exact value except in CAD
- Equipment has a tolerance
- Out by 10 micrometres
- If we know the tolerance we can compensate
- Out by 10 micrometres
- Equipment has a tolerance
- CALIBRATION ENVIRONMENT
- difficult to control
- Is a function
of
- Temperature
- Humidity
- electrostatic fields
- Human interaction
- pressure
- vibration
- Electromagnetic fields
- Temperature
- Calibrator must be aware
of all potential sources of
error
- difficult to control
- Stability is required to process
many measurements across time
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