拖尾測(cè)量測(cè)試卡簡(jiǎn)介
拖尾測(cè)量測(cè)試卡YE0175設(shè)計(jì)用于測(cè)量在區(qū)域右側(cè)或下方的黑色區(qū)域中的視頻電平引起的干擾。由水平白色線條排列在黑色背景上組成。
拖尾測(cè)量的定義
測(cè)量由在區(qū)域右側(cè)或下方的黑色區(qū)域中的視頻電平引起的干擾。該干擾的特征在于，在恢復(fù)對(duì)應(yīng)于黑色的正常視頻電平的視頻電平之前，測(cè)量延遲的持續(xù)時(shí)間。
測(cè)量設(shè)備
視頻電平表B / W監(jiān)視器，示波器，低通濾波器：500 KHz
測(cè)量條件
必須調(diào)整圖表照明，使白條給出平均光圈設(shè)置為100％的信號(hào)。
增益：0dB
伽馬校準(zhǔn)：OFF
輪廓校準(zhǔn)：OFF
膝部校準(zhǔn)：OFF
基座=標(biāo)稱視頻電平的5％（= 35 mV）
測(cè)量程序
在示波器上顯示穿過(guò)白線的線，并在R，G，B輸出端進(jìn)行測(cè)量。重復(fù)測(cè)量以確認(rèn)在各種情況下監(jiān)視器上觀察到的條紋性質(zhì)。為了區(qū)分過(guò)曝的效果和條紋的效果，可以將不受穿過(guò)白色表面的僅受過(guò)曝影響的線的數(shù)目作為參考進(jìn)行不同的測(cè)量。
結(jié)果介紹
條紋中黑色電平的最大峰值偏差與條紋外部的相鄰黑色相比。必須小心避免白色條紋的過(guò)曝效應(yīng)。結(jié)果以標(biāo)稱幅度700 mV / 75Ω的百分比給出。
The YE0175 is designed for measurement of the disturbance caused by the video level in black areas to the right of or below the areas. Horizontal white lines are positioned on a black background.
Definition of streaking measurements
Measurement of the disturbance caused by the video level in black areas to the right of or below the areas.The disturbance is characterized by measuring the duration of the delay before the video level corresponding to the normal video level of the black is restored.
Measuring equipment
Video level meter; B/W monitor, oscilloscope, low-pass filter: 500 KHz
Measurement conditions
The chart illumination must be adjusted so that the white bars give a signal of 100% with average iris setting.
Gain: 0dB
Gamma corrector: OFF
Contour corrector: OFF
Knee corrector: OFF
Pedestal = 5% of nominal video level (= 35 mV)
