IEC 60068-3-7:2001

Environmental testing - Part 3-7: Supporting documentation and guidance - Measurements in temperature chambers for tests A and B (with load)

Provides a uniform and reproducible method of confirming that temperature test chambers conform to the requirements specified in climatic test procedures of IEC 60068-2-1 and IEC 60068-2-2, when loaded with either heat-dissipating or non heat-dissipating specimens under conditions which take into account air circulation inside the working space of the chamber. This standard is destined primarily for users when conducting regular chamber performance monitoring.

Essais d'environnement - Partie 3-7: Documentation d'accompagnement et guide - Mesures dans les chambres d'essai en température pour les essais A et B (avec charge)

Fournit une méthode uniforme et reproductible pour confirmer que les chambres d'essai en température sont conformes aux exigences spécifiées dans les méthodes d'essais climatiques de la CEI 60068-2-1 et de la CEI 60068-2-2 quand elles sont chargées de spécimens dissipateurs d'énergie ou non, avec des conditions qui tiennent compte d'une circulation d'air à l'intérieur de l'espace de travail de la chambre. Cette norme est en premier lieu destinée à aider les utilisateurs lorsqu'ils réalisent des contrôles réguliers des performances de leur chambre d'essai.

General Information

• Status: Published
• Publication Date: 26-Aug-2001
• ICS: 19.040 - Environmental testing
• ICS: 29.020 - Electrical engineering in general
• Technical Committee: TC 104 - Environmental conditions, classification and methods of test
• Drafting Committee: MT 16 - TC 104/MT 16
• Current Stage: DELPUB - Deleted Publication
• Start Date: 07-Jul-2020
• Completion Date: 07-Sep-2018

Relations

• Revised: IEC 60068-3-7:2020 - Environmental testing - Part 3-7: Supporting documentation and guidance - Measurements in temperature chambers for tests A (Cold) and B (Dry heat) (with load)
• Effective Date: 05-Sep-2023

Overview

IEC 60068-3-7:2001 is an international standard developed by the International Electrotechnical Commission (IEC) that provides essential supporting documentation and guidance for environmental testing, specifically addressing measurements in temperature chambers during climatic tests A and B (with load). This standard ensures a uniform and reproducible method to verify that temperature test chambers comply with the requirements of IEC 60068-2-1 and IEC 60068-2-2.

The standard focuses on testing chambers under loaded conditions - whether the specimens are heat-dissipating or non heat-dissipating. It takes into account factors such as air circulation within the chamber working space, aiming to maintain accurate thermal conditions. IEC 60068-3-7 is primarily designed for users who conduct regular performance monitoring of temperature chambers to guarantee consistent and reliable test results.

Key Topics

• Temperature Chamber Performance Monitoring: The standard defines methods for ongoing verification of chamber performance under operational loads, vital for climatic test procedures A (cold test) and B (dry heat test).

• Measurement Procedures: It outlines measurement techniques for monitoring temperature distribution, temperature stability, and air circulation inside loaded temperature chambers.

• Test Conditions Compliance: Ensures conformity of temperature chambers with thermal cycling profiles specified in IEC 60068-2-1 and IEC 60068-2-2.

• Load Conditions: Differentiates between heat-dissipating loads (active heat sources) and non heat-dissipating loads (passive specimens), addressing the effects on internal chamber environment.

• Documentation and Reporting: Provides detailed instructions on how to document the conditions, measurement results, and compliance verification, including appropriate uncertainty evaluations.

• Normative References: Integrates applicable references such as IEC 60068-1 (General and guidance), related IEC technical committees, and internationally recognized calibration standards to maintain traceability and accuracy.

Applications

IEC 60068-3-7:2001 is essential for organizations and laboratories performing environmental testing in fields such as:

• Electronics and Electrical Components Testing: Verification of product reliability under temperature extremes.

• Automotive and Aerospace Industries: Ensuring materials and components withstand thermal stresses in operational environments.

• Quality Assurance Programs: Regular chamber calibration and validation to uphold test integrity.

• Research and Development: Supporting the design of robust products through validated thermal testing environments.

• Certification and Compliance Testing: Enabling manufacturers to meet product environmental standards and regulatory requirements.

By implementing this standard, users can achieve accurate, repeatable data on chamber conditions, ensuring valid test results and minimizing product failure risks related to temperature stresses.

Related Standards

• IEC 60068-2-1: Environmental testing - Part 2-1: Tests - Test A: Cold.

• IEC 60068-2-2: Environmental testing - Part 2-2: Tests - Test B: Dry heat.

• IEC 60068-1: Environmental testing - General and guidance.

• IEC 60529: Degrees of protection provided by enclosures (IP Code).

• ISO/IEC 17025: General requirements for the competence of testing and calibration laboratories (relevant for calibration aspects).

• Other IEC Technical Committee Publications: Covering environmental testing practices and calibration standards.

Summary

IEC 60068-3-7:2001 supports the environmental testing community by standardizing measurement and evaluation methods in temperature chambers under loaded conditions. It promotes consistency in verifying that temperature chambers meet climatic test specifications, thereby enabling organizations to maintain high testing accuracy and product reliability. Compliance with this guidance is crucial for laboratories and manufacturers to fulfill quality assurance and certification mandates regarding environmental performance.

For comprehensive environmental test chamber validation, IEC 60068-3-7 complements other related standards to provide a robust framework supporting global testing harmonization and technical excellence in temperature chamber measurements.

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