Checking Gamut
Use the Arrowhead % setting (found in the Gamut Thresholds submenu of the Configuration m enu) to specify a
percentage of t
he screen to ignore for gamut violations.
Checking Composite Gamut
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.
1. Perform the Setup for Gamut Checks
procedure. Select Arrowh ead in step 5.
(See page 46.)
2. Compare the signal to the display to
determine out of gamut composite
components, noting 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 of
7.5 IRE for NTSC and 0 mV for PAL.
Waveform Rasterizers Quick Start User Manual 49
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