ISO 376:2011

Name: ISO 376:2011 — Metallic materials — Calibration of force-proving instruments used for the verification of uniaxial testing machines
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Metallic materials — Calibration of force-proving instruments used for the verification of uniaxial testing machines

Название (английский):

ISO 376:2011

Metallic materials — Calibration of force-proving instruments used for the verification of uniaxial testing machines

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 30
Дата публикации:: 7 июня 2011 г.
Издание:: ISO IS 376 edition 4 version 1
ICS:: 77.040.10

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Описание (английский):

ISO 376:2011 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. It 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.

Abstract

Похожие стандарты

Упомянутые в описании и другие стандарты ISO

Overview

ISO 376:2011 - Metallic materials - Calibration of force‑proving instruments used for the verification of uniaxial testing machines - defines a standardized method to calibrate and classify force‑proving instruments (force transducers plus indicator) used to statically verify uniaxial testing machines (tension/compression). The standard applies to instruments where force is determined by measuring elastic deformation or a directly proportional quantity and includes procedures to establish measurement traceability, repeatability and uncertainty.

Key technical topics and requirements

Scope and applicability: Calibration method for force‑proving instruments that measure force via elastic deformation; intended for static verification of uniaxial testing machines.

Calibration principle: Apply precisely known forces and record indicator readings; the indicator is treated as an integral part of the instrument.

Calibration modes:

Reversible (incremental/decremental) - calibration with increasing and decreasing forces to determine hysteresis (no creep test needed).
Incremental‑only - calibration with increasing forces only; requires a creep test (readings at 30 s and 300 s) instead of hysteresis measurement.

Preloading and loading procedure: Preload to maximum force three times; perform multiple series of calibration forces (including rotation of the transducer at prescribed angles) and ensure at least eight forces for reliable interpolation of the calibration curve.

Indicator resolution and replacement: Minimum resolution rules for analogue/digital indicators; replacement indicators must have traceable calibration and compatible excitation/uncertainty so they do not materially affect the overall system uncertainty.

Minimum force and classification: Minimum calibration forces depend on instrument class (e.g., classes 00, 0.5, 1, 2) and a fraction of the transducer capacity; classification procedure included.

Environmental and procedural controls: Temperature stability (18–28 °C, ±1 °C), uniform loading intervals, strain gauge warm‑up (≥30 min), and dismantling checks.

Ancillary documentation and annexes: Annexes provide example loading fittings/dimensions (A), additional procedures (B), and a new Annex C addressing measurement uncertainty of calibration and subsequent use. Normative reference: ISO/IEC 17025.

Practical applications and users

Who uses ISO 376:2011:

Calibration and metrology laboratories performing force transducer calibrations

Material testing laboratories verifying uniaxial tensile/compression machines

Manufacturers of force transducers and testing machines seeking traceable calibration procedures

Quality managers and compliance officers ensuring test system accuracy and conformity

Practical benefits:

Ensures accurate, traceable force measurements and reliable machine verification

Provides a consistent basis for reporting measurement uncertainty and classification

Supports compliance with laboratory accreditation requirements (e.g., ISO/IEC 17025)

Related standards

ISO/IEC 17025 - General requirements for the competence of testing and calibration laboratories (normative reference in ISO 376:2011)

Additional ISO technical committee guidance on mechanical testing (ISO/TC 164) may be relevant for broader test program compliance.

Keywords: ISO 376:2011, calibration, force‑proving instruments, uniaxial testing machines, force transducer, calibration procedure, measurement uncertainty, hysteresis, creep test, ISO/IEC 17025.

ISO 376:2011

Abstract

Похожие стандарты

Overview

Key technical topics and requirements

Practical applications and users

Related standards

Технические детали

BS EN ISO/IEC 17025:2017

General requirements for the competence of testing and calibration laboratories.

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