本文介绍了VGA信号的基本电气特性，包括HSYNC/VSYNC的TTL信号标准及RGB信号的电压水平。此外，还讨论了如何通过测量颜色信号电压来判断显示器或显卡是否已正确连接。
VGA 电气特性
HSYNC/VSYNC are TTL signals, RED/GREEN/BLUE are 0.7V peak-to-peak (0V for black level, 0.7V for full color intensity). Some monitors provide support for 1V peak-to-peak
signals, but they are not standardized.
VGA 怎么表示连接成功的
VGA uses 75Ohm termination at both ends (max. current 18.7mA,
power 13mW). It is possible to measure color signal voltage level to detect connected monitor or graphics card. Most monitors measure GREEN signal
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