The Measurement Standard of the Contrast of Color Picture Tube

The contrasts of SYC's (上海永新)29" NF tube in different environment condition and white-field current were tested and compared by national standard GB/T5998-94 and GB/T17309-1998. The signals of white-black strip and white-black window were made by PowerPoint of Microsoft. According to national standard GB/T17309-1998 and American's national standard ANSI, we tested different contrasts of a kind of 29" pure flat CRT which was produced by SYC and made some comparison with each other. With the comparison and analysis above, an evaluation of different test standards was gained.