Tektronix WFM4000 Series, Руководство пользователя

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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 con fi gured 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 de fi ning these levels 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 Arrowhead 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
graticule lines.
The thresholds are de fi ned 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.
36 WFM4000 and WFM5000 Waveform Monitors User Manual