BS EN ISO 376:2011 pdf free download
BS EN ISO 376:2011 pdf free download.Metallic materials – Calibration of force-proving instruments used for the verification of uniaxial testing machines (ISO 376:2011).
BS EN ISO 376 specifies a method for the calibration of force-proving instruments used for the static verification of uniaxial testing machines (e.g. tension/compression testing machines) and describes a procedure for the classification of these instruments.
This International Standard is applicable to force-proving instruments in which the force is determined by measuring the elastic deformation of a loaded member or a quantity which is proportional to it.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
ISO/IEC 17025, General requirements for the competence of testing and calibration laboratories
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1 force-proving instrument
whole assembly from the force transducer through to, and including, the indicator
4 Symbols and their designations
Symbols and their designations are given in Table 1.
5 Principle
Calibration consists of applying precisely known forces to the force transducer and recording the data from the indicator, which is considered an integral part of the force-proving instrument.
When an electrical measurement is made, the indicator may be replaced by another indicator and the force- proving instrument need not be recalibrated provided the following conditions are fulfilled.
a) The original and replacement indicators have calibration certificates, traceable to national standards, which give the results of calibration in terms of electrical base units (volt, ampere). The replacement indicator shall be calibrated over a range equal to or greater than the range for which it is used with the force-proving instrument, and the resolution of the replacement indicator shall be at least equal to the resolution of the original indicator when it is used with the force-proving instrument.
b) The units and excitation source of the replacement indicator should be respectively of the same quantity (e.g. 5 V, 10 V) and type (e.g. AC or DC carrier frequency).
c) The uncertainty of each indicator (both the original and the replacement indicators) shall not significantly influence the uncertainty of the whole force-proving instrument assembly. It is recommended that the uncertainty of the replacement indicator be no greater than 1/3 of the uncertainty of the entire system (see C.2.11).BS EN ISO 376 pdf free download.
