What Is a Vector Monitor?
An instrument for monitoring color television signals. Color television signals include luminance signals and chrominance signals. The brightness signal can be observed with an ordinary oscilloscope for its waveform. The amplitude of the chrominance signal represents the saturation of the color (that is, the color density), and the phase represents the hue of the color (that is, the color type). You must use a vector oscilloscope to monitor the color TV signal.
- Chinese name
- Vector oscilloscope
- Foreign name
- vectoroscilloscope
- Applied discipline
- Communication
- An instrument for monitoring color television signals. Color television signals include luminance signals and chrominance signals. The brightness signal can be observed with an ordinary oscilloscope for its waveform. The amplitude of the chrominance signal represents the saturation of the color (that is, the color density), and the phase represents the hue of the color (that is, the color type). You must use a vector oscilloscope to monitor the color TV signal.
Vector Oscilloscope Principle
- The vector oscilloscope displays polar vector graphics. The magnitude of the vector represents the amplitude of the chrominance signal, that is, color saturation; and the phase angle represents the phase of the chrominance signal, that is, hue. Add the BY component in the chrominance signal to the horizontal deflection axis of the oscilloscope, and add the RY component in the chrominance signal to the vertical deflection axis of the oscilloscope to display a polar plot of the excellent signal on the display (vector illustration ).
- Usually the specified color bar signal is used as the standard monitoring signal of the vector oscilloscope, as shown in the figure. Each vector vertex represents yellow, cyan, green,
- Amplitude of 6 standard color signals of purple, red, and blue; phase angle represents the correctness of the 6 signal colors. For example, the yellow phase angle is 167 °, the cyan phase angle is 283.5 °, the green phase angle is 240.5 °, the purple phase angle is 60.5 °, the red phase angle is 103.5 °, and the blue phase angle is 347. °. The phase angle of the burst signal is ± 135 °.
- A scale grid is drawn on the display of the vector oscilloscope, and the standard position of the color bar signal and the allowable error range are marked for monitoring. In the figure, small squares represent ± 2.5 ° and ± 2.5%, and large squares represent ± 10 ° and ± 20%.
- When observing the vector diagram of the chrominance signal, you need to observe the waveform with another waveform monitor. Some vector oscilloscopes have switch buttons for vector and waveform observation. The new vector oscilloscope also has intelligent functions such as automatic measurement and data processing.