BS 3846:1970

Co-operating organizations
Foreword
Methods
1 General
1.1 Scope
1.2 Definitions
2 Description of methods
2.1 Introduction
2.2 Calibration by means of a calibrating rig
2.3 Calibration by means of elastic devices
3 Calibration procedures
3.1 General
3.2 Accuracy of gauge length
3.3 Procedure using a calibrating rig
3.4 Procedure using elastic devices
3.5 Assessment of calibration
3.6 Grading
3.7 Record of results
3.8 Certificate of calibration
4 Requirements for calibration devices
4.1 Introduction
4.2 Calibrating rigs
4.3 Calibrated test pieces
5 Notes and recommendations
5.1 Notes and recommendations
Tables
1 Grading of extensometers
2 Limitation of grading
3 Example of grading
Figures
1 Measurement by interferometry
2 Measurement with slip gauges
3 Measurement with micrometer screw

Definitions, calibration devices and procedures for grading in terms of accuracy and repeatability. Recommendations on extensometer construction and use of calibrating equipment.