Operation Manual

Tuning Utilities
122 ViewCast
Understand the display
The vectorscope display has two parts: the graticule and the trace.
 Graticule - A scale you use to quantify the parameters of the signal under examination.
Graticule works with a color bar signal.
Note: 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
103). 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 103. Vectorscope with Color Outside the Targets
To adjust the source, adjust the saturation on the capture card until you have it positioned
inside the targets (Figure 104).
Figure 104. Vectorscope Adjustments (Saturation)