The vertical deflection circuit includes preamplifier (Y 1 and Y2), vertical switch circuit, delay line circuit and vertical output amplifier which are independent of each other. Each preamplifier amplifies or attenuates the input signal from several millivolts to several hundred 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 switching circuit switches the Y 1 and Y2 preamplifiers and the Y3 signal from the trigger generator, and the switched signal is 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 volts to several tens of volts to push 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 input end of the external trigger (Y3), and amplifies and shapes it to form a trigger pulse signal. The pulse signal generated by the trigger generator drives the A-scan generator to generate A-scan sawtooth wave. However, in the "automatic" mode, the A-scan generator can generate the scanning sawtooth wave by self-excitation even if there is no trigger signal. The B-scan generator generates a delayed scanning sawtooth wave. B scanning adopts continuous scanning mode and is driven by delayed scanning start signal generated by A scanning signal. The water bottle switch circuit switches the sawtooth signal generated by the AB scan generator and the horizontal signals of Y 1 and Y3 from the vertical switch circuit in X-Y 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 several tens of volts, and pushes the horizontal deflection plate of the oscilloscope tube.
The indicator tube circuit consists of a high voltage generator, a Z-axis amplifier and an indicator tube circuit. The high voltage generator generates a cathode voltage of-1.8KV and an accelerated voltage of+18KV. Z-axis amplifier amplifies the brightness enhancement signal and brightness control signal from A and B scan generators to tens of volts, and applies them to the grid (control grid) of oscilloscope tube through oscilloscope tube circuit. The oscilloscope tube circuit provides various voltages to each electrode of the oscilloscope tube, which makes the oscilloscope tube work in the best state. Display the waveform with good focus and less distortion. It also sets the signals from Z-axis amplifier and other circuits to a level suitable for oscilloscope tube operation.
The calibration signal circuit provides a square wave signal of 0.5Vp-p, which is generated by a CMOS multivibrator (CD 160 1), shaped by Schmidt circuit, and finally divided by a resistor.
The low-voltage power supply circuit converts the AC voltage of the power grid into the DC voltage required by each part of the oscilloscope. The transformer secondary has 6.3V winding, which provides filament for oscilloscope tube and two sets of voltages for different circuits of oscilloscope tube. These two groups of voltages are rectified and filtered, which not only provide 18V, but also provide+140V,+12V, +5V and-12V after voltage stabilization.