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BKSTS Illustrated Dictionary of Moving Image Technology, 4th Edition by Martin Uren

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Appendix ZColour bar test signals and displays

Figure App.Z.1 shows a PAL vectorscope display of 100% PAL colour bars.

Figure App.Z.2 shows a component vectorscope display of 100% colour bars. Note the display is circular rather than an ellipse and there is no burst vector.

Figures App.Z.3, 4 and 5 show the line-rate waveforms for the three types of analogue composite PAL colour bars.

1 100% bars are only used in a broadcast production environment.

2 95% bars were used by the BBC (e.g. at the top of the Test Card).

3 75% bars (or EBU bars) are used for circuit testing and identification between broadcasters.

Figure App.Z.6 shows a parade display of 625-line component 100% colour bars. A 350 mV offset is often used to align the peaks of the colour ...

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