Tektronix WFM6120 User Manual

Checking Gamut
Checking Gamu
t
Signals that are legal and valid i n one signal representation may not be legal in another representation. Specifically, signals
which are legal in the Digital YCbCr representation may not be legal if transcoded to RGB or encoded to NTSC / PAL.
Any signal that fails this test is considered out of gamut.
Your instrument supports multiple displays and alarms to detect out of gamut signals. The flexible, tiled display allows you
to simultaneously view several gamut measurements to learn which is most appropriate for a given application. The
displays are and their uses follow:
Diamond for checking that SDI signals conform to legal RGB gam
ut space
Split Diamond separates the upper and lower diamonds to show excursions below black; otherwise it is identical to
the Diamond display
Arrowhead for checking if an SDI signal is legal for composite color space
Composite Waveform modes for checking both SDI and composite signals for legality in composite color space
Diamond, Split Diamond, and Arrowhead have adjustable thresholds. If the signal goes outside the area defined by the
thresholds, the signal is out of gamut. If these limits are exceeded, then the instrument can generate alarms if configured to
do so. For composite waveforms, the legal limit is simply the maximum level allowed for the combination of luma and chroma.
This limit depends on the application. For example, a video tape machine m ay be able to record and play out signals with
higher luma and chroma components than a transmitter.
Setup for Gamut Checks
1. Connect a video signal and terminate it
properly.
2. Select the input corresponding to the
signal connected.
3. Select a tile.
4. Press and hold the GAMUT button to
display the signal in a tile and pop up the
GAMUT menu.
5. Use the arrow keys and SEL button to
set the menu to one of these three gamut
displays:
Diamond. Use to detect, isolate,
and correct RGB component gamut
errors.
Split Diamond. Use to reveal
hard-to-find black gamut errors.
Arrowhead. Use to detect composite
gamut errors, without employing a
composite encoder.
44 Waveform Monitors Quick Start User Manual

Tektronix WFM6120 Specifications

General

Brand	Tektronix
Model	WFM6120
Category	Monitor
Language	English