The LCG395A Video Color Signal Source is an outstanding example of functional capability that utilizes digital integrated circuitry to simultaneously generate: a complete rainbow spectrum plus 10 precise gated rainbow patterns; plus 3 gated color patterns for 90?, 180? and 270? measurements. The unit segments this information with a 5 step, staircase, modulation level signal; and window, convergence and white purity raster adjustment facilities.