Verification of the various performance that low-voltage electrical appliances should possess under normal operation and fault conditions. The test items of low-voltage electrical appliances mainly include general inspection, voltage drop measurement, temperature rise experiment, insulation resistance and withstand voltage test, rated making and breaking capacity test, short circuit making and breaking capacity test, short-term withstand current capacity test, action characteristic test, life test, immunity test, characteristic test, etc. There are many similarities between the equipment and testing methods of low-voltage electrical testing and high-voltage electrical testing. Most low-voltage electrical equipment tests in some countries around the world are attached to high-voltage electrical equipment test stations, and high and low voltage electrical equipment tests can share the test power supply. Most of China's low-voltage electrical testing stations are independent, using the power grid as the test power source through transformers. General inspection: including visual inspection; Inspection of external dimensions and installation dimensions of electrical appliances; Electrical clearance and creepage distance inspection; Contact opening distance, overtravel, and pressure inspection; Electrical operation force inspection, etc. The gap of an electrical appliance refers to the minimum air insulation distance between different poles or between two conductive circuits after one pole is disconnected. Creepage distance refers to the leakage distance along the surface of the insulation between two conductive circuits that support and fix different poles or after one pole is disconnected. When moisture is adsorbed, heated, or contaminated on the surface of electrical insulation components, their surface resistance drops sharply. To ensure a certain degree of insulation performance of electrical insulation components, minimum electrical clearances and surface leakage (creepage) distances are specified in the design of electrical appliances based on voltage levels and usage locations. Contact opening distance refers to the shortest distance between electrical contacts when they are in the breaking position. Contact overtravel ensures reliable closure of electrical contacts even after certain wear and tear during operation. For manually operated electrical appliances, the operating force should be checked to verify whether it meets the specified requirements for manual operation
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