Purpose: The ASK-LPM55, offering you hundreds of sophisticated TV testing patterns in multi-system, is ideal for use in factory production, R&D, TV station, CATV head-end system.etc. Description: Built-in On Screen Display indicates the TV system of the output pattern. Fourteen basic test patterns are provided, which include Circle, 8-step Grey Scale, 16-step Grey Scale, Color Bar, Multiburst, Color Difference R-Y, B-Y, Moving white Field, White Pattern, Checkerboard, Crosshatch, Dots, Center Cross, and Purity Patterns. More than 100 different test patterns are available through the combination of 14 basic patterns. Multiburst pattern comprises full screen definition pattern of 8 vertical bars at frequencies of 0.1-1.8-2.8-3.0-3.4-3.8-4.8 MHz. Four different speeds are available for the Moving White Field for testing fast motion picture. Multi-system output suits worldwide TV system: NTSC 3.58, NTSC 4.43, PAL, PAL M, PAL N, and SECAM. Three video output formats - Composite video, Y/C Separation, Color Difference Y, R-Y, B-Y.