ISO 376-2011 PDF

Full title and description

ISO 376:2011 — Metallic materials — Calibration of force‑proving instruments used for the verification of uniaxial testing machines. This International Standard specifies a method for the calibration of force‑proving instruments used for the static verification of uniaxial testing machines (for example tension/compression testing machines) and defines a procedure for the classification of these instruments.

Abstract

ISO 376:2011 gives a standardized procedure to calibrate force‑proving instruments (force transducers/proving rings etc.) in which force is determined by measuring elastic deformation or a proportional quantity. It covers calibration conditions, characteristics to be recorded, calibration steps, classification of instruments and guidance on subsequent use (including measurement uncertainty considerations).

General information

• Status: Published (International Standard; confirmed on review cycle).
• Publication date: June 2011 (2011-06).
• Publisher: International Organization for Standardization (ISO).
• ICS / categories: 77.040.10 — Mechanical testing of metals.
• Edition / version: Edition 4 (ISO 376:2011).
• Number of pages: 30 pages.

Scope

Applies to the static calibration of force‑proving instruments used to verify uniaxial testing machines (tension and compression). The standard is intended for instruments where force is derived from elastic deformation (or a proportional quantity) and includes tests and requirements to determine calibration values, classification (e.g., incremental, interpolation), and the conditions under which calibrated instruments may be used. Guidance on environmental, mounting and loading conditions and on estimating measurement uncertainty is included.

Key topics and requirements

• Definition of force‑proving instrument types and principal calibration method (measurement of elastic deformation or proportional output).
• Characteristics to record: resolution, range, linearity, hysteresis, repeatability, zero drift and overload behaviour.
• Calibration procedure: preliminary checks, application of discrete and incremental forces, recommended loading sequences and conditioning.
• Classification rules for instruments (incremental only, incremental/decremental, interpolation, specific forces) and permitted uses for each class.
• Requirements for attachment/fixturing and checks to ensure axial application of force and absence of interaction during compression calibration.
• Guidance on temperature effects, electrical supply variation (where applicable) and correction of deflection for temperature differences.
• Information on measurement uncertainty: estimating and reporting calibration uncertainty and implications for subsequent use.
• Informative annexes: example dimensions/fixturing, additional background information and uncertainty guidance.

Typical use and users

Used by calibration laboratories, national/metrology institutes, testing and quality laboratories, manufacturers of force transducers and testing machines, accreditation bodies and service organisations performing machine verification. It is referenced when establishing traceability of force measurements for material testing and when verifying the force‑measuring capability of load frames and universal testing machines.

Related standards

Standards commonly used alongside ISO 376:2011 include ISO 7500‑1 (Verification and calibration of the force‑measuring system of tension/compression testing machines) and ISO 9513 (Calibration of extensometer systems used in uniaxial testing). National and regional adoptions (e.g., EN ISO 376) exist that incorporate the ISO text. These related documents address machine verification, extensometer calibration and complementary procedures for ensuring valid uniaxial test results.

Keywords

force‑proving instrument, force calibration, force transducer, proving ring, uniaxial testing machine, tensile testing, compression testing, measurement uncertainty, traceability, ISO 376, metallic materials, verification, classification, calibration procedure

FAQ

Q: What is this standard?

A: ISO 376:2011 is an International Standard that specifies methods for calibrating force‑proving instruments used to verify static uniaxial testing machines (tension/compression).

Q: What does it cover?

A: It covers calibration procedures, required characteristics and tests, classification of instruments (how they may be used), fixturing and environmental considerations, and guidance on estimating and reporting measurement uncertainty for force‑proving instruments.

Q: Who typically uses it?

A: Calibration and testing laboratories, manufacturers of force transducers and testing machines, national metrology institutes, accreditation bodies and quality/test engineers use ISO 376 to ensure calibrated, traceable force measurements for material testing.

Q: Is it current or superseded?

A: ISO 376:2011 is the current (published) edition that replaced earlier editions (for example ISO 376:2004). The ISO record shows the 2011 edition as published and in the confirmed stage of its review cycle. Users should check national SDO catalogues for any later amendments or regional/adopted versions.

Q: Is it part of a series?

A: It is part of the family of ISO standards for metallic materials and mechanical testing (ICS 77.040.10). It is commonly used alongside related standards such as ISO 7500‑1 (verification/calibration of testing machines' force‑measuring systems) and ISO 9513 (extensometer calibration).

Q: What are the key keywords?

A: Key keywords include: force‑proving instrument, force calibration, force transducer, proving ring, uniaxial testing machine, verification, calibration procedure, measurement uncertainty, traceability.