This standard specifies the technical requirements, test methods, inspection rules, marking, packaging, transportation, and storage of sounders and buzzers. This standard applies to sounders and buzzers used in fields such as audio and video instruments, communication terminals, personal computers, clocks, household appliances, toys, office supplies, and transportation. 2. Reference standard GB 191-90 Packaging, storage and transportation graphical symbols GB 2423-81 Basic environmental testing procedures for electrical and electronic products GB 2828-87 Batch by batch inspection, sampling procedures and tables (applicable to continuous batch inspection) GB 2829-87 Periodic inspection, sampling procedures and tables (applicable to production process stability inspection) GB 4857.5-84 Measurement Methods for Sounders and Buzzers 3 Definition: All terms and definitions in this standard comply with the provisions of SJ Measurement Methods for Sounders and Buzzers Requirement 4.1 Operating conditions Environmental temperature: -25 ℃ - ss ℃; Atmospheric pressure: 86~106kPa; Relative humidity: 35%~85%. 4.2 External dimensions and appearance requirements 4.2.1 External dimensions are specified by product standards
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