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The performance of portable extensometer calibration rigs

Elkington, D (1999) The performance of portable extensometer calibration rigs. NPL Report. CMAM 45

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This report looks at the design of the UK's most commonly used portable extensometer calibration rig (ECR). Based on specialist operator experience and a range of new measurements using NPL' s laser calibration system, the importance of different aspects of the design are quantified. This information will be useful for the calibration technician trying to optimise the performance of an ECR.
The effect of temperature changes on calibration results for ECRs is also detailed. A series of measurements are described that separate the influences of temperature changes on ECRs from those on the calibration system. The uncertainties of the laser calibration system are also described since they limit the final uncertainty of the measurements made with an ECR.
AQD design ECRs are prone to misalignment during transport so guidance is provided on their packing and handling. Some of the limitations of the AQD design are summarised and the design of a simplified portable ECR is discussed.

Item Type: Report/Guide (NPL Report)
NPL Report No.: CMAM 45
Subjects: Engineering Measurements
Engineering Measurements > Mass, Force, Pressure
Last Modified: 02 Feb 2018 13:18
URI: http://eprintspublications.npl.co.uk/id/eprint/1251

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