Checking Gamut
4.
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-
fi
nd black gamut errors.
Arrowhead. Use to detect composite
gamut errors, without employing a
composite encoder.
5.
Press the
GAMUT
button to close the
menu.
Checking RGB Gamut
The Diamond display effectively shows
how the R, G, and B signals relate, making
it a good tool for detecting gamut errors.
The instrument converts the Y, P
b,
and P
r
components recovered from the serial signal
to R, G, and B to form the Diamond display.
To predictably display all three components,
they must lie between peak white, 700 mV,
and black, 0 V.
For a signal to be in gamut, all signal vectors
must lie within the G-B and G-R diamonds.
Conversely, if a signal vector extends outside
the diamond, it is outofgamut. The direction
of an excursion outofgamut indicates
which signal is excessive. Errors in green
amplitude affect both diamonds equally,
while blue amplitude errors affect only the
top diamond and red errors affect only the
bottom diamond.
WFM4000 and WFM5000 Waveform Monitors User Manual
33
