Test chamber quality appraisal

The HTMLGTOKEN0 test box, with environmental modelling and precision control at its core, achieves a precise simulation of the high-low temperature cycle, wet heat exchange and compound stress by optimizing temperature-moisture control algorithms, energy efficiency ratio of refrigeration/heating systems and box sealing, and is widely used in areas such as electronic product reliability testing, ageing auto parts validation, material resistance assessment and biomedical stability testing. In the semiconductor industry, it is used for chip high-temperature storage tests; in the area of new energy vehicles, for meeting thermal shock tests for battery packs; and in military equipment, for performance verification in extreme environments. Compared to the general environmental box, the test box has the characteristics of high control accuracy, high temperature increase and high long-term stability, and is the core equipment for the adaptation of the product environment. TMLTAGTOKEN1

is a product quality assessment service with a court-registered register, which provides testing box quality assurance services, a professional validation team and advanced instrumentation, and provides fair and accurate validation of test box quality verification. HTMLGTOKEN3HTMTAGTOKEN4HTMTAGTOKEN5HTMTAGTOKEN6

As testing standards become stricter, related quality dispute cases have increased significantly. The judicial dispute focuses on:

1, performance index dispute: temperature and humidity uniformity exceeds standard, heating and cooling rate does not meet standard;

2, material defects: heater resistance wire oxidation and fracture, insulation layer foaming Uneven density;

3, process problems: unreasonable air duct design leads to temperature field delamination, aging and leakage of sealing strips;

4, contract performance disputes: core modules, software functions and technical agreements are inconsistent.

0 Such cases need to pass temperature field verification, material failure analysis and control logic audit to clarify the ownership of quality responsibility.

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The quality appraisal agency's appraisal of the test box mainly includes the following steps:

1. Appearance inspection: Check whether the appearance of the test box is damaged, deformed or abnormal.

2. Functional test: Carry out functional test according to the product manual or relevant standards to verify whether the performance indicators such as temperature, humidity, vibration and so on meet the requirements.

3. Data analysis: Through data analysis, determine whether the performance of the test chamber is stable and whether there are abnormal fluctuations or deviations.

4. Failure analysis: If the test chamber fails, failure analysis needs to be performed to find out the cause of the failure and determine whether it is a quality problem.

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A testing agency of the applicant signed a "Rapid Temperature Change Test Chamber Procurement Contract" with an equipment manufacturer of the respondent, agreeing that the heating rate is ≥10℃/min. During the test, the battery sample failed due to temperature change lag, and the manufacturer argued that it was caused by the operator not pre-cooling.

Identification analysis results:

The quality analysis expert group discussed and comprehensively analyzed the relevant information of the "test box", the contract technical agreement, the on-site inspection case materials and other data, and made the following quality analysis opinions: HTMLTAGT The actual heating rate of the test chamber involved in the OKEN5

case is only 6℃/min (agreement ≥10℃/min), and the local density of the insulation layer is 0.03g/cm³ (agreement ≥0.05g/cm³); the air duct design defect caused the temperature difference between the upper, middle and lower parts to reach 5℃ (agreement ≤2℃); the PID parameters were not adaptively adjusted, and the temperature overshoot was >3℃.

The appraisal conclusion concluded that defects in equipment design and control were the main cause of insufficient performance.

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The test chamber quality appraisal report should include:

1, the purpose of the appraisal (such as temperature change rate dispute, contract compliance verification) and cited standards (GB/T 10589, IEC 60068, etc.);

2, equipment model involved, control system version, calibration record;

3, detection method and equipment list (such as temperature recorder, thermal imager);

4, test data and failure correlation analysis (such as the impact of insulation layer density on energy consumption);

05, clarify the quality responsibility judgment conclusion and technical basis;

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26, signature of the appraiser, thermal engineering professional qualification certificate and official seal of the organization.

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