To Check Composite Gamut - Tektronix WVR8200 User Manual

Checking gamut

To check composite gamut

Figure 74: Arrowhead gamut display plots
Usage notes
142
The Arrowhead gamut display plots luminance (Y) against chrominance (C)
to check if the composite signal adheres to standard gamut. NTSC and PAL
Arrowhead displays (75% Color bars) and indicates the values of the graticule
lines. The arrowhead shape of the graticule results from overlaying the standard
limits for luminance and luminance-plus-peak chrominance. (See Figure 74.)
Set the thresholds for gamut. (See page 138, To set up gamut checks.) After
selecting the Arrowhead display, compare the signal to the display to determine
out-of-gamut composite components. Note the following:
Signals exceeding the luminance amplitude gamut extend above the top
horizontal limit (top electronic graticule line).
Signals exceeding the luminance plus peak chrominance amplitude gamut
extend beyond the upper and lower diagonal limits.
The bottom horizontal line shows the minimum allowed luminance level. 0 or
7.5 IRE for NTSC and 0 mV for PAL.
To automate this check, do the procedure Automating Gamut Checks. (See
page 143.)
WVR8200 and WVR8300 User Manual