1. Theme and Scope of Application This standard specifies the technical requirements, testing methods, inspection rules and markings, packaging, transportation, and storage requirements for horn speakers. This standard applies to passband electric horn speakers (hereinafter referred to as "speakers") for sound playback in wired broadcasting systems. For special purpose speakers and speakers packaged with transformers, they can refer to separate regulations in this standard. 2. Reference standard GB 191 Packaging, storage and transportation graphical symbols GB 1498 Measurement methods for motors and low-voltage electrical appliances GB 2421 Basic environmental testing procedures for electrical and electronic products GB 2423.1 Basic environmental testing procedures for electrical and electronic products Test A: Low temperature test method GB 2423.2 Basic environmental testing procedures for electrical and electronic products Test B; High temperature test method GB 2423.3 Basic environmental testing procedures for electrical and electronic products Test Ca: Constant damp heat test method GB 2828- Sampling procedures and tables for batch inspection by attributes (applicable to continuous batch inspection) GB 2829 Sampling procedures and tables for periodic inspection by attributes (applicable to production process stability inspection) GB/T 14475 Speaker measurement method 3 Test conditions shall be in accordance with Chapter 3 of GB/T 14475. 4. Operating conditions and ambient temperature: -25~-155 ℃; Relative humidity: can reach 95% at minus 40 ℃; atmospheric pressure; 86 to 106 kPa
Function of testing report:
1. Project bidding: Issue authoritative third-party CMA/CNAS qualification report
2. Online e-commerce platform entry: Quality inspection report recognized by major e-commerce platforms 3. Used as a sales report: issuing legally effective testing reports to make consumers more confident 4. Papers and research: Provide professional personalized testing needs 5. Judicial services: providing scientific, fair, and accurate testing data 6. Industrial problem diagnosis: Verify the troubleshooting and correction of industrial production problemsBaijian and testing process:
1. Telephone communication and confirmation of requirements
2. Recommend solutions and confirm quotations 3. Mail samples and arrange testing 4. Progress tracking and result feedback 5. Provide reports and after-sales service 6. If urgent or priority processing is requiredTesting and testing characteristics:
1. The testing industry is fully covered, meeting different testing needs
2. Fully cover the laboratory and allocate localized testing nearby3. Engineers provide one-on-one services to make testing more accurate
4. Free initial testing, with no testing fees charged
5. Self service order delivery for free on-site sampling
6. Short cycle, low cost, and attentive service 7. Possess authoritative qualifications such as CMA, CNAS, CAL, etc 8. The testing report is authoritative and effective, and is generally used in China