Checking Gamut
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 arrowhead representation of the SDI input as a composite signal. By defining these levels 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 Setup for Gamut Checks
procedure. Select Arrowh ead in step 5.
(See page 44.)
2. Compare the signal to display to
determine out of gamut luminance. Note
the following:
The adjustable thresholds are
indicated by the dark blue horizontal
graticule lines.
The thresholds 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 useful 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.
Waveform Monitors Quick Start User Manual 49
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