Operation Manual

Chapter 11: Tuning Utilities
82 Viewcast
Parameter
Description
on the video.
The processing within a vectorscope and the display of the processed signals readily detects and
evaluates both phase and gain distortions of the chrominance.
Understand the Display
The vectorscope display has two parts: the graticule and the trace.
Table 27. Vectorscope Display Parts
Part
Description
Graticule
 A scale you use to quantify the parameters of the signal under
examination.
 Work with a color bar signal.
 Remember, the color bar’s signal consists of brightness
information (luminance) and high frequency color information
(chrominance or chroma).
Trace
The video signal itself. The demodulated chrominance signals
electronically generate it.
Each bar of the color bar’s signal creates a dot on the vectorscope's display. The position of
these dots remains relative to the boxes, or targets, on the graticule. The phase of the burst
vector represents the major indicators of the chrominance (color) signal's health.
Within the circle, you see six target shapes each containing smaller, sectioned shapes (Figure
102). The smaller shapes designate where each dot of the color bar’s signal should fall if the
chroma gain and phase relationships are correct.
Figure 102. Vectorscope with Color Outside the Targets