Máy hiện sóng huỳnh quang Màn hình

The fluorescent screen is located at the end of the oscilloscope tube, and its function is to display the deflected electron beam for observation. The inner wall of the oscilloscope's fluorescent screen is coated with a layer of luminescent material, so that the spot on the screen that is impacted by high-speed electrons displays fluorescence. At this point, the brightness of the light spot depends on the number, density, and speed of the electron beam. When the voltage of the control electrode is changed, the number of electrons in the electron beam will change, and the brightness of the light spot will also change. When using an oscilloscope, it is not advisable to allow a very bright light spot to appear fixedly at a position on the fluorescent screen of the oscilloscope tube, otherwise the fluorescent material at this point will be burned out due to long-term electronic impact, thereby losing its luminous ability.
Vật lý sơ đồ của máy hiện sóng
Huỳnh quang màn hình tráng với khác nhau huỳnh quang chất ý chí hiển thị màu sắc khác nhau và khác nhau dư quang lần khi đối tượng đến điện tử tác động. Nói chung, the ones used to observe the general signal waveform are green light emitting, belonging to the medium afterglow oscoscope tube, and the ones used to observe non periodic and low-frequency signals are orange yellow light emitting, belonging to the long afterglow oscilloscope tube; in oscilloscopes used for photography, blue emitting short afterglow oscoscopes are generally used.
Y-trục khuếch đại mạch
Due to the very low deflection sensitivity of oscilloscope tubes, such as the commonly used 13SJ38J type oscilloscope tube, which has a vertical deflection sensitivity of 0.86 mm/V (about 12 V produces a deflection of 1 cm), generally the measured signal voltage must first be amplified by a vertical amplification circuit, and then added to the vertical deflection plate of the oscilloscope tube đến thu được an thích hợp kích thước hoa văn in the dọc hướng.
Sinh viên máy hiện sóng
X-axis amplification circuit