BS 3846(1970) : 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

Establishes methods for the calibration at room temperature and grading of extensometers used in the testing of metals in tension and compression. Defines the terms used and describes the standard methods of calibration; the requirements for calibration devices are stated. Extensometers are graded in terms of accuracy and repeatability, and instructions for the use of certificates of calibration are included with recommendations on certain constructional features and the use of calibrating equipment.