b. The vectorscope must be used for making certain measurements on a color
television system, particularly differential phase measurements.
It is also an
excellent tool for evaluating both luminance and chrominance channels of most video
The purpose and outstanding feature of the grating generator as applied to
black and white television were discussed earlier in this lesson.
Now we will
examine its operation and functions as they pertain to color operation.
a. The cross-hatch pattern generated by the grating generator is extremely
useful when making adjustments in the convergence of a color picture tube.
b. When viewing the picture area of the receiver, with the grating pattern
applied, look for proper alignment of the vertical and horizontal bars.
convergence is properly adjusted if the bars are placed over one another and no
color fringing is apparent.