Checking Gamut
Usage Notes
To adjust the IRE level limits, do the procedure Adjusting Gamut Limits. (See page 53.)
To automate this check, do the procedure Automating Gamut Checks. (See page 51.)
Checking Luma Gamut
Luma limit thresholds can be configured for identifying luma exceeding threshold limits. They apply to both the incoming
SDI and to the a
rrowhead representation of the SDI input as a composite signal. By defining these l evels in percent, they
automatically account for the presence or absence of setup. The thresholds are affected by your choice of set-up or no
set-up for the Arrowhead display.
1. Perform the S
etup for Gamut Checks
procedure. Select Arrowh ead in step 5.
(See page 46.)
2. Compare the signal to display to
determine ou
t of gamut luminance. Note
the following:
The adjustable thresholds are
indicated by the dark blue horizontal
graticule l
ines.
The thresho
lds are defined in terms
of percent of full scale.
The range for the Upper limit is 90%
to 108%.
The range to the Lower Limit is -6%
to +5%.
Another us
eful Arrowhead function is a measure of how well the active video signal is using the dynamic range of the video
channel. A properly adjusted signal should be centered in the arrowhead graticule and have transitions that approach
all the limits.
50 Waveform Rasterizers Quick Start User Manual
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