Vertical input channel protector of oscilloscope

Abstract

The invention relates to a vertical input channel protector of an oscilloscope, which comprises a direct current power supply module capable of providing a direct current power supply for the vertical input channel protector of the oscilloscope, an amplifying circuit, a fixed attenuator, a protective tube, an impedance matching network and a bias regulating circuit. The invention aims to provide the vertical input channel protector of the oscilloscope, which can set a protection threshold according to actual needs, does not change the characteristic impedance of the original circuit, does not generate distortions to input signals, and solves the technical problems that a vertical input channel protection circuit of the prior oscilloscope has high protection threshold, changes the characteristic impedance of the original circuit and generates distortions to the input signals. The vertical input channel protector of the oscilloscope generates no influence on the amplitudes of tested signals and front and back edges, and also solves the problems of impedance matching and signal attenuation when the input signals are small and the protector generates no protective effects.

Description

technical field [0001] The invention relates to a circuit protector, in particular to an oscilloscope vertical input channel protector for measuring fast and large-amplitude signals. Background technique [0002] In the physical measurement of fast pulsed rays, the amplitude of a signal often ranges from mV to several kV. In many cases, in addition to measuring the full waveform of this large-amplitude signal, it is also necessary to measure the initial segment of the mV level. However, the attenuator cannot be used for the measurement of the initial section of the signal. In this case, the vertical sensitivity of the oscilloscope needs to be set higher, so the vertical input channel of the oscilloscope is particularly vulnerable to damage. [0003] At present, two types of protection circuits are often used in electrical measurement: one is such as figure 1 The shown fuse plus resistor attenuation network. In this circuit, the fuse is a hot-melt device, which can withst...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide an oscilloscope vertical input channel protector that can set the protection threshold according to actual needs, does not change the characteristic impedance of the original circuit, and does not generate distortion to the input signal, which solves the problem of the existing oscilloscope vertical input channel protection circuit. There are technical problems such as high protection threshold, changing the characteristic impedance of the original circuit and distorting the input signal

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