Conductivity test device and electrical apparatus

Abstract

The invention provides a conductivity test device and an electrical apparatus. The conductivity test device includes a square wave generation source used for generating square wave signals, a first filtering circuit connected to the square wave generation source and used for performing filter processing on the square wave signals so as to obtain sinusoidal signals free of direct current components, with the sinusoidal signals being adopted as test voltage, a testing electrode unit comprising one group of test electrodes, connected to the first filtering circuit and used for applying the test voltage onto a medium to be tested, a current detection circuit used for detecting current signals flowing through the test electrode unit and for converting the detected current signals into corresponding voltage signals, and a signal processing circuit connected to the current detection circuit and used for determining the conductivity of the medium to be tested according to voltage signals outputted by the current detection circuit. According to a technical scheme of the conductivity test device and the electrical apparatus, under the premise of protecting the test electrodes from being polarized, the conductivity of the medium to be tested can be accurately tested.

Description

technical field [0001] The invention relates to the technical field of conductivity testing, in particular to a conductivity testing device and electrical equipment. Background technique [0002] As one of the important characteristics of substances, conductivity is widely used in material classification technology, material analysis technology, environmental protection technology and industrial production control technology because of its simple detection principle and low cost of detection devices. [0003] In the related art, the detection of conductivity is usually analyzed by using the volt-ampere characteristic curve. Specifically, a voltage signal is applied to the test electrode as an excitation signal, and the current signal flowing through the test electrode is read. According to the above-mentioned voltage signal and current signal Determine the conductivity of the analyte. However, if the DC voltage signal is used as the DC excitation signal, it will cause the p...

AI Technical Summary

Problems solved by technology

However, if the DC voltage signal is used as the DC excitation signal, it will cause the polarization of the test electrode; if the AC voltage signal is directly used as the AC excitation signal, the requirements for the stability of the amplitude and frequency of the AC excitation signal are high, and The polarization of the test electrode will be caused by the DC component in the AC excitation signal. At the same time, the test results of the AC excitation signal are not well compatible with digital circuits, so it cannot provide users with intuitive conductivity test results.

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