Guangdong: light passing rate of 20.6% increase over last year – lighting, audio
< BR> Recently, the Guangdong Provincial Bureau of Quality Supervision released the second quarter of this year the province production lighting, audio power amplifier products of 7 monitoring test results, batch pass rate of 76.3%; lighting up the passing rate improved 20.6 percentage points last year, audio power amplifier was only 39.7% of qualified, serious pulled down the regular monitoring of the inspection in the province.
<BR> The sample of the lamps, tableware, clothing, audio amplifier, shoes, PVC pipe construction, adhesives and other products 982 7 Total 1076 batch production enterprises. The results from the random look, ceramic, PVC pipe construction high rate of qualified products; lamps, clothing, shoes, adhesives relatively low rate of qualified products, the quality of audio power amplifier is fairly conspicuous.
<BR> This sample the Guangzhou, Zhongshan and other seven cities of 334 manufacturers of lighting products a total of 340 batches of product sampling batch passing rate of 74.4%, up sharply increased last year, reflecting the province lighting products gradually improved quality. Unqualified items are:
<BR> First, the supply current harmonics, power terminal disturbance voltage, insertion loss of the project failed. The sample of 49 batches of the project failed. The main reason for failure is part of the enterprise is aware of electromagnetic compatibility, but do not know how to design a standard circuit, or subject itself did not test the equipment.
<BR> Second, protection against electric shock failed. The sample of 35 batches of the project failed. Failure is mainly due to the failure of the lamp used products, product procurement control is lax.
<BR> Third, heat, fire projects fail. The 32 batches of random failure of the project. Failed mainly because the use of the poor or low-grade heat-resistant fire-resistant insulation materials parts and components, purchasing, and daily inspection control is lax.
<BR> The sample of 63 manufacturing enterprises in 63 batches of audio power amplifier products, by test, 38 unqualified batches, although sampling rate of qualified products last year compared with 32.7% slightly higher, but the quality is still relatively serious. The sample failed projects are:
<BR> First safety tests. The 32 batches of random failure, failure rate as high as 50.8%. Mainly in signs and instructions for use, the structural requirements for protection against electric shock, electric shock under normal working conditions, dangerous, electrical clearance and creepage distances do not meet standards. Main reasons for failure of the standard manufacturers do not understand, no marked in accordance with national regulations. In addition, the circuit design is unreasonable.
<BR> Second, room temperature electrical performance testing. The 26 batches of random failure, failure rate of 41.3%. Audio power amplifier directly affects the electrical properties of the true extent of its reduction of sound. Failure caused by distortion of the main project is the limited output power, gain limited effective frequency range, total harmonic distortion and signal to noise ratio. Failure is mainly due to the product manufacturer instructions express technical indicators are too high, the actual electrical properties of the product does not meet the technical requirements of the express products. There are many reasons for this situation the one hand, manufacturers do not have enough production and testing equipment or not equipped with the necessary testing and technical staff, understand their own performance indicators to achieve the level of what the other is a manufacturer deliberately to improve their products really do not understand the product performance indicators to deceive the average consumer.
<BR> Third, electromagnetic compatibility testing. The sample of 14 batches failed. EMC products will lead to failure of the electromagnetic environment around the deterioration of its peripheral equipment not in proper working condition. For example, the interference
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Machine for watching, radio listening; a digital system with data transmission of data loss; the work of medical electronic equipment failure; air navigation system disorders; accidental detonation initiation devices; industrial process control functions such as the failure. Main reasons for failure of EMC products of the enterprises do not attach importance to, not in accordance with the 3C certification requirements in the production of qualified products, free to change the circuit layout, change the type and supplier of critical components, even components of the specification or the out the key components are replaced, or the necessary electromagnetic compatibility measures are completely removed in production. All these changes have completely changed the electromagnetic compatibility of products, making the testing of the product certification process and inconsistent, leading to random failure.
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