User manual

Reference: Making Measurements
WFM 90 & WFM 91 User Manual
3–13
Chrominance Vector Targets
The chrominance vectors terminate in a system of graticule targets
consisting of two boxes (a small box inside a large box). A sample
target is shown in Figure 3–5.
The dimensions of the large boxes represent 10° centered on the
exact chrominance phase, and 20% of chrominance amplitude
centered around standard amplitude. The dimensions of the smaller
boxes represent 2.5° and 2.5 IRE (3° and 5% PAL) of
chrominance amplitude.
For the PAL graticule, each chrominance vector related to the +V
burst terminates in targets consisting of two boxes (a small box
inside a large box). The vectors associated with the –V burst
terminate in the targets consisting of smaller boxes only.
°
°
°
°
°
°
°
°
Figure 3–5: Vector targets – NTSC values (PAL values in parentheses)