A digital oscilloscope probe automatic adaptation circuit and method

Abstract

The invention discloses a digital oscilloscope probe automatic adaptation circuit and method, and specifically relates to the technical field of testing. It solves the problem that existing oscilloscopes cannot automatically adapt to active or passive probes. For different probes, users need to manually set the input impedance and probe coefficient of the oscilloscope. Once the impedance does not match or the setting is wrong, it is easy to cause distortion of the test waveform or Insufficient testing to the correct waveform. The digital oscilloscope probe automatic adaptation circuit includes FPGA, oscilloscope probe interface circuit and connector, and the oscilloscope probe interface circuit includes a first pin, a second pin, a third pin, a fourth pin, and a fifth pin , the sixth pin, the seventh pin, the eighth pin and the ninth pin, wherein the fifth pin is connected to the passive probe adaptation circuit, and the seventh pin is connected to the active probe adaptation circuit.

Description

technical field [0001] The invention belongs to the technical field of testing, and in particular relates to a digital oscilloscope probe automatic adaptation circuit and method. Background technique [0002] There are two types of input impedance of digital oscilloscopes: 50Ω and 1MΩ. When the active probe input is selected, the input impedance of the oscilloscope needs to be set to 50Ω, which is generally used for mid-to-high-end broadband digital oscilloscopes. When the high-impedance passive probe input is selected, the input impedance of the oscilloscope needs to be set to 1MΩ, which is generally used for low-end digital oscilloscopes. If the impedance does not match or is set incorrectly, the test waveform will be distorted or the correct waveform cannot be tested. [0003] Domestic oscilloscopes are positioned in the middle and low-end oscilloscope market, and the bandwidth is generally below 1GHz. Most of them use passive probe input mode, and generally do not supp...

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Problems solved by technology

[0005] The purpose of the present invention is to solve the problem that the existing oscilloscope cannot automatically adapt the active or passive probe. For different probes, the user needs to manually set the input impedance and probe coefficient of the oscilloscope. Once the impedance does not match or the setting is wrong, it is easy to cause the test The lack of waveform distortion or the inability to test the correct waveform proposes a digital oscilloscope probe that can automatically identify active probes or passive probes, and automatically match the input impedance of the oscilloscope and the attenuation coefficient of the probe according to the type of the probe. Adapted circuits and methods

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