Crosstalk degree Test Chart YE0216
The YE0216 is designed for determining the degree of crosstalk of FM-luminance sidebands into the down-converted
chrominance band, being demodulated as unwanted color signals (the socalled 'cross-color').
chrominance band, being demodulated as unwanted color signals (the socalled 'cross-color').
Conditions of shooting
• The subject illumination of a reflective test chart shall be 2000 lx +/- 5%
• The luminance of a transparent test chart, at peak white, shall be 636cd/ m2 +/- 5% (= 2000lx)
• The non-uniformity of the subject illumination shall be less than 5%
• The correlated color temperature of the light source shall be set manually or automatically to 3200K +/- 100K
• The test chat shall be shot by the camera so that the frame limited by the arrows exactly coincides with the edges of the picture displayed on the video monitor in underscan mode
• The focus control shall be in auto or manual mode and shall be at the best focus
• Gain control shall be set to “0 dB” gain
• Gain control shall be set to “0 dB” gain
• Optical filter shall be set to “open position”
For the measurement of the camera performance the reference luminance level on the camera output is assumed to be 700mV peak-to-peak for PAL and SECAM systems and 714mV peak-to-peak for NTSC system (from the blanking level to the peak white).
The measurement shall be made on the vectorscope screen in measuring the following parameters.
• The amplitude of the red vector shall be measured and taken as Vref
• The greater amplitude of the color beats signal VLC appearing around the cross point of the vectorscope axes
• The amplitude VLC of the color beat signal shall be related to the amplitude Vref of the red vector in order to obtain the degree of luminanced crosstalk as LC
LC (dB) = 20lg (VLC / Vref)ade on the vectorscope screen in measuring the following parameters.
