Checking Gamut
Usage Notes
To adjust the IRE level limits, do the procedure Adjusting Gamut Limits. (See page 38, Adjusting Gamut Limits .)
To automate this check, do the procedure Automating Gamut Checks. (See page 37, Automating Gamut Checks.)
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 l evels in percent, they
automatically account for the presence or absence of setup. The thresholds are affected by your choice of setup or no
setup for the Arrowhead display.
1. Perform the
Setup for Gamut Checks
procedure. Select Arrowh ead in step 4.
(See page 32.)
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
graticul
e lines.
The thre
sholds 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%.
Anoth
er useful Arrowhead function is a m easure of how well the a ctive 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.
36 WFM4000 and WFM5000 Waveform Monitors User Manual
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