Tektronix Waveform Monitors WFM700 Series - Manual (Page 89)

Reference
3- 40 WFM700 Series Waveform Monitors User Manual
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 determin-
ing 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.
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 tradition-
al 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.
Vector Display