The entire circuit composition of the oscilloscope is shown in the figure. It consists of a vertical deflection circuit, a horizontal deflection circuit, a calibration signal, an oscilloscope circuit and a low-voltage power supply circuit. The vertical deflection circuit includes independent preamplifiers (Y1 and Y2), vertical switching circuits, delay line circuits and vertical output amplifiers. Each preamplifier amplifies or attenuates the input signal from several millivolts to hundreds of volts to a suitable level, and then sends it to the vertical switching circuit, and the trigger signal is also taken out by this stage. The vertical switch circuit switches the signals from Y1, Y2 preamplifiers and Y3 from the trigger generator, and the switched signals are sent to the vertical output amplifier through the delay line. The trigger signal is also switched and sent to the trigger amplifier as an internal trigger signal. The vertical output amplifier amplifies the vertical signal from the delay line circuit to several thousand to tens of volts to drive the vertical deflection plate of the oscilloscope tube. The horizontal deflection circuit includes a trigger generator, a water bottle switch circuit and a horizontal output amplifier. The trigger generator receives the internal trigger signal from the vertical switch circuit or the external trigger signal from the external trigger (Y3) input terminal and amplifies and shapes it to form a trigger pulse signal. The pulse signal generated by the trigger generator is used to drive the A-scan generator to generate an A-scan sawtooth wave. However, in the "automatic" mode, even if there is no trigger signal, the A-scan generator can self-excited to generate a scanning sawtooth wave. The B-scan generator generates a delayed sweep sawtooth waveform. B scan adopts continuous scan mode, which is driven by the delayed scan start signal generated by A scan signal. The water bottle switch circuit switches the sawtooth wave signal generated by the AB scan generator and the Y1 and Y3 horizontal signals from the vertical switch circuit in the X-Y working mode, and sends them to the horizontal output amplifier. The water bottle output amplifier amplifies the output signal of the water bottle switch circuit to several volts to tens of volts to push the horizontal deflection plate of the oscilloscope tube. The oscilloscope circuit is composed of a high-voltage generator, a Z-axis amplifier and an oscilloscope circuit. The high-voltage generator generates -1.8KV cathode voltage and +18KV post-acceleration voltage. The Z-axis amplifier amplifies the enhancement signal and brightness control signal from the A and B scan generators to tens of volts, and adds them to the grid (control grid) of the oscilloscope tube through the oscilloscope circuit. The oscilloscope circuit provides various voltages to each electrode of the oscilloscope to make the oscilloscope work at its best. To display well-focused and low-distortion waveforms. It also sets signals from the Z-axis amplifier and other circuits to levels suitable for oscilloscope operation. The calibration signal circuit provides a 0.5Vp-p square wave signal, which is generated by a CMOS multivibrator (CD1601), shaped by a Schmidt circuit, and finally obtained by dividing the voltage by a resistor. The low-voltage power supply circuit converts the AC voltage of the power grid into the DC voltage required by various parts of the oscilloscope. The secondary side of the transformer provides a 6.3V winding for the filament of the oscilloscope tube and two sets of voltages required for different circuits of the oscilloscope tube. These two sets of voltages are rectified and filtered. In addition to providing 18V unregulated voltage, they also provide +140V, +12V, +5V and -12V voltage after stabilization.