Reference

Vector Mode

Press the VECTOR button to enter the Vector mode, where you can select two related displays: Vector and Lightning. Both displays have targets for determining conformance using 75% or 100% color bar signals.

NOTE. Refer to the reference document A Guide to Standard and High-Definition Digital Video Measurements at the Tektronix, Inc. Web site (www.tektronix.com) for information about how the Vector and Lightning displays are created.

Vector Display The Vector display allows you to view the signal as a complex vector of color components, with no luminance information included. The display is a traditional vector plot of the color difference signals Pb and Pr. The radial magnitude represents saturation and the phase angle represents hue. With the Vector display, you can check the encoder accuracy for both phase and amplitude errors.

Vector Graticules. You can use the Vector menu to select either a component or composite vector graticule. When the component graticule is selected, you can turn the compass rose graticule and the I/Q axis on or off using the Grat / Gamut Default Setup submenu in the Configure menu.

NOTE. The component vector graticule is provided to allow comparison with other equipment with similar displays. For a more accurate representation of hue shift, use the composite vector representation.

Each chrominance vector of a Color Bar signal terminates as a bright dot in a target. The distance from the center box to the target box corresponds to the amplitude for the color being measured. The dot brightness corresponds to the duration of the color bar. The dimension of each target box represents 2% (±14 mV) of a 700 mV amplitude.

The dashed-vector line labeled “I” is for evaluating flesh tones. Increasing radial amplitude along this axis indicates increasing flesh-tone saturation. Increasing angle change from this axis indicates increasing flesh-tone hue change.

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WFM700 Series Waveform Monitors User Manual