Philips PM 5508 Operating Manual page 27

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Fig. VII-6. Typical purity error
2. • Gheck the purity of red (this pattern offers the adventage that the
green and blue guns need not be switched off). Larger convergence
errors may have an effect on this check. Fig. VII-6 shows a purity
error.
3. •
This pattern can also be used to check whether ablack/white receiver
suffers from excessive interference due to the colour subcarrier.
Y
Y
Y
Y
Y