Checking Gamut
Arrowhead – Use
to detect composite gamut errors, without employing a
composite encoder.
Spearhead – Us
e to detect RGB gamut errors.
4. Press the GAMUT button to dismiss the pop-up menu.
5. Press the CONFIG button and select Gamut Thresholds.
6. Set the thresholds as desired.
Checking RGB Gamut
The Diamond and Spearhead displays effectively show how the R, G, and B
signals relate. The Diamond display is a good tool for detecting gamut errors.
Spearhead requires Option PROD.
To form the Diamond display, the instrument converts the Y, P
b,
and P
r
components
recovered from the serial signal to R, G, and B. To predictably display all three
compon
ents, 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 out
of gamut. The direction of an excursion out of gamut 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. (See Figure 59.)
Figure 59: Diamond display plot
120 WFM8200 and WFM8300 Waveform Monitors
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