Checking Gamut
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) show 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 4.
(See page 32.)
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-
pluspeak 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.
WFM4000 and WFM5000 Waveform Monitors User Manual 35
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