This standard is applicable to black and white and color television video channels in China. Note: Channel interfaces associated with international television video channels are not subject to this restriction. 1. Explanation of Terms 1.1 TV Video Channel A TV video channel refers to a channel or unit device whose input and output are either color full TV signals or black and white full TV signals, regardless of the signal processing process in its intermediate stages. Note: For some equipment (such as signal sources, transmitters, receivers, etc.), local modifications and supplements may be made according to their special circumstances during the testing of the items specified in this standard. 1.2 Color Full TV Signal Color Full TV signal is composed of brightness signal, chromaticity signal, color synchronization signal, and composite synchronization signal. 1.3 Average Image Level (APL) The definition of average image level is the average value of the average component of the image signal amplitude during the effective period of the row over the entire frame period (excluding the row and field blanking periods), expressed as a percentage of the nominal value of the brightness signal amplitude
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