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GB/T 11158-2008 PDF English

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GB/T 11158-2008: Specifications for high temperature test chambers
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GB/T 11158: Evolution and historical versions

Standard IDContents [version]USDSTEP2[PDF] deliveryName of Chinese StandardStatus
GB/T 11158-2008English205 Add to Cart 0-9 seconds. Auto-delivery Specifications for high temperature test chambers Valid
GB/T 11158-1989English439 Add to Cart 4 days Specification for high temperature test chambers Obsolete

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GB/T 11158-2008: Specifications for high temperature test chambers

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GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 71.040.10 N 61 Replacing GB/T 11158-1989 Specifications for high temperature test chambers Issued on. JUNE 30, 2008 Implemented on. JANUARY 01, 2009 Issued by. General Administration of Quality Supervision, Inspection and Quarantine; Standardization Administration of PRC.

Table of Contents

Foreword... 3 1 Scope... 5 2 Normative references... 5 3 Terms and definitions... 5 4 Conditions of use... 7 5 Technical requirements... 8 6 Test method... 9 7 Inspection rules... 18 8 Markings, packaging, storage... 20 Appendix A (Informative) Suspicious data identification method... 22 Appendix B (Informative) Evaluation of measurement uncertainty of temperature variation... 24

Foreword

This standard is one of the Specifications for environmental test equipment" series of standards. This series of standards consists of the following standards. - GB/T 10586-2006 Specifications for damp heat chambers - GB/T 10587-2006 Specification for salt mist test chambers - GB/T 10588-2006 Specification for mould growth test chambers - GB/T 10589-2008 Specifications for low temperature test chambers - GB/T 10590-2006 Specifications for high and low temperature/low air pressure testing chambers - GB/T 10591-2006 Specifications for high temperature/low air pressure testing chambers - GB/T 10592-2008 Specification for low/high temperature test chambers - GB/T 11158-2008 Specifications for high temperature test chambers - GB/T 11159-2008 Specifications for low air pressure test chamber This standard replaces GB/T 11158-1989 Specifications for high temperature test chambers". The main changes between this standard and GB/T 11158-1989 are as follows. - ADD the chapter "Terms and definitions"; the content adopts the relevant parts of IEC 60068-3-5; - According to the concept of temperature fluctuation of IEC 60068-3-5, CHANGE the temperature fluctuation index into 1 °C (see Table 1); - According to the temperature data recording requirements of IEC 60068-3- 5, CHANGE to record data once per minute (see 6.3); - According to the test method of temperature rise rate in IEC 60068-3-5, MODIFY the test method of temperature rise rate (see 6.5); - EXPAND the range of atmospheric pressure in the environmental conditions of use (see 4.1); - MODIFY the temperature grade (see Table 1); - MODIFY the wind speed requirements (see Table 1); - For the temperature rise conditions, in addition to the temperature rise rate, ADD the temperature rise time (see Table 1); - MODIFY the safety protection requirements; ADD the requirements for electrical insulation strength (see 5.3); - CHANGE the test conditions to the no-load conditions (see 6.2); - ADD the information on the evaluation method of Temperature variation measurement uncertainty and its application (see Appendix B). Appendix A and Appendix B of this standard are informative appendixes. This standard was proposed by China Machinery Industry Federation. This standard shall be under the jurisdiction of the Mechanical Industry Laboratory Instrument and Equipment Standardization Technical Committee. Responsible drafting organizations of this standard. Chongqing Yinhe Test Instrument Co., Ltd., Shanghai Espec Environmental Equipment Co., Ltd., the Fifth Institute of Electronics of the Ministry of Information Industry, and Shanghai Experimental Instrument Factory Co., Ltd. Participated drafting organizations of this standard. Chongqing Star Test Equipment Co., Ltd., Wuxi Sunan Test Equipment Co., Ltd., Chengdu Tianyu Test Equipment Co., Ltd., Hunan Institute of Metrology and Inspection. The main drafters of this standard. Wang Huabin, Lu Liming, Lai Wenguang, Feng Mingkang, Chen Yunsheng, Ni Yiming, Kuai Zhengxin, Li Qingxian, Xu Qinglu. This standard replaces the standard previously issued as follows. - GB/T 11158-1989. Specifications for high temperature test chambers

1 Scope

This standard specifies the terms and definitions, conditions of use, technical requirements, test methods, inspection rules, markings, packaging, storage related to high temperature test chambers (referred to as test chambers"). This standard applies to test chambers that conduct low-temperature tests for electrical, electronic and other products, parts, materials.

2 Normative references

The provisions in following documents become the provisions of this Standard through reference in this Standard. For the dated references, the subsequent amendments (excluding corrections) or revisions do not apply to this Standard; however, parties who reach an agreement based on this Standard are encouraged to study if the latest versions of these documents are applicable. For undated references, the latest edition of the referenced document applies. GB/T 191-2008 Packaging - Pictorial marking for handling of goods (ISO 780.1997, MOD) GB 14048.1-2006 Low-voltage switchgear and controlgear - Part 1.General rules (IEC 60947-1.2001, MOD)

3 Terms and definitions

The following terms and definitions apply to this standard. 3.1 Test chamber An enclosed chamber and space the part of which can meet the specified test conditions. 3.2 Temperature setpoint The desired temperature set by the test chamber control device. 3.3 Achieved temperature After stabilization, the temperature at any point in the working space of the test chamber. 3.4 Temperature stabilization The temperature of all points in the working space reaches the temperature setpoint and is maintained within the specified tolerance range. 3.5 Temperature fluctuation After stabilization, the difference between the highest and lowest temperature at any point in the working space within a specified arbitrary time interval. 3.6 Working space The part of the test chamber that can maintain the specified conditions within the specified tolerance range.

4 Conditions of use

4.1 Environmental conditions 4.2 Power supply conditions 4.3 Load conditions The load of the test chamber shall meet the following conditions at the same time.

5 Technical requirements

5.1 Product performance The performance items and indexes of the test chamber are as shown in Table 1. 5.2 Product structure and appearance requirements 5.2.1 The inner wall of the test chamber shall be made of materials that are heat-resistant, resistant to oxidation, corrosion-resistant, have certain mechanical strength. There shall be no pollution sources that affect the test. 5.2.2 Insulation materials shall have flame retardant properties. 5.2.3 The thickness of the insulation layer shall ensure that the temperature of 5.2.8 The appearance coating layer shall be flat and smooth, with uniform color; there shall be exposed bottom, blistering, layering or scratches. 5.3 Safety and environmental protection requirements 5.3.1 Between the power supply terminal and the metal shell of the chamber. 5.3.2 The electrical connection and wiring of the protective grounding terminal and the test chamber's shell shall meet the requirements of 7.1.9 in GB 14048.1-2006. 5.3.3 There shall be protection and alarm devices for over temperature, over current, etc.

6 Test method

6.1 Main test instruments and devices 6.1.1 Anemometer An anemometer which has an induction capacity of not less than 0.05 m/s. 6.2 Test conditions 6.2.1 The test conditions shall meet the requirements of 4.1 and 4.2. 6.2.2 The test is carried out under no-load conditions. 6.3 Method of temperature test 6.3.1 Location and number of test points 6.3.2 Test procedure 6.3.3 Data processing and test results 6.3.3.1 Correct the measured temperature data according to the correction value of the test instrument. 6.3.3.2 Eliminate suspicious data (refer to Appendix A). 6.3.3.3 For the data measured in the constant temperature phase (i.e., the data measured in 6.3.2.2), calculate the average temperature of 30 measured values at each point according to formula (1). 6.4.3 Calculation and evaluation of test results 6.4.3.1 Correct the measured temperature value according to the correction value of the test instrument. 6.4.3.2 Calculate the arithmetic mean of the temperature of each test point. 6.4.3.3 Substitute the average value of the temperature of the inner wall of the working chamber and the temperature of the geometric center of the working space into the formula (6). 6.5 Test method of temperature rise rate 6.5.1 Test point The test point is the geometric center point of the working space. 6.5.2 Test procedure 6.5.2.1 Within the adjustable temperature range of the test chamber, select the ambient temperature as the lowest specified temperature; select the highest nominal temperature as the highest specified temperature. 6.5.2.2 Turn on the heat source to rise the temperature of the test chamber from ambient temperature to the highest specified temperature, to determine the time required by the test chamber's temperature from 10% of the temperature range to 90%. 6.5.2.3 Record the temperature value every 1 min during the temperature rise process. 6.5.3 Calculation and evaluation of test results 6.6 Wind speed test method 6.6.1 Test conditions This test is carried out under no-load and room temperature conditions. 6.6.2 Number and location of test points The number and location of the test points are the same as 6.3.1. 6.6.3 Test procedure 6.6.3.1 Hang the fine cotton yarn or other light objects on the test points. Close the door and turn on the fan, to find the prevailing wind direction at each test point. 6.6.3.2 Place the anemometer at the test point. After closing the door, measure the wind speed value of the prevailing wind direction at each test point. 6.6.4 Calculation and evaluation of test results 6.6.4.1 Correct the measured wind speed value according to the correction value of the anemometer. 6.6.4.2 Calculate the average value of wind speed at all test points according to formula (8). 6.11 Inspection and judgement method of surface coating quality The test method is visual inspection, which shall be inspected once before and after the test as specified in 6.3 ~ 6.10.The appearance coating shall meet the requirements of 5.2.8.

7 Inspection rules

7.1 Type of inspection The test chamber's inspection is divided into two types. type inspection and exit-factory inspection. 7.2 Inspection items The items of type inspection and exit-factory inspection are as shown in Table 2. 7.3 Type inspection 7.4 Exit-factory inspection 7.4.1 Inspection department The quality inspection department of the manufacturer is responsible for exit- factory inspection. 7.4.2 Inspection conditions This inspection is carried out under no-load conditions. 7.4.3 Inspection items 7.4.3.1 Inspection items are as shown in Table 2. 7.4.4 Sampling and judgement rules 7.4.4.1 The exit-factory sampling quantity of temperature gradient and temperature variation is calculated based on 10% of the product batch, but not less than 2 units.

8 Markings, packaging, storage

8.1 Marking 8.1.1 The nameplate of the test chamber shall be clear and durable, fastened firmly. 8.1.2 The content of the product nameplate shall include. 8.2 Packaging 8.2.1 The words and signs of the packing carton shall comply with the requirements of GB/T 191-2008. 8.2.2 The packaging carton shall be firm and reliable. 8.2.3 The packaging carton shall be protected from rain and moisture accumulation. 8.3 Storage 8.3.1 The fully packaged test chamber shall be stored in a well-ventilated warehouse without corrosive gases and chemicals. ......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.


      

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