Solution conductivity measuring instrument based on microcontroller

Abstract

The invention relates to the field of electrochemical measurement and provides a solution conductivity measuring instrument based on a microcontroller. The solution conductivity measuring instrument includes a power supply module, an excitation signal generation module, a signal power amplification module, a conductance cell measured circuit, a measuring-signal rear-end processing module, a measuring-signal acquisition module, a temperature detection module, a microcontroller, an expansion interface module, and an LCD display and keyboard input module. The instrument uses the flash stored data on a CPU chip, generates excitation sinusoidal signals at different frequencies and amplitudes through an analog-to-digital converter, and measures the conductivity of the measured solution in the conductance cell after the excitation signals pass the measured conductance cell; and meanwhile, the solution temperature is acquired and the measured conductivity is corrected; and by adding a simulation selection switch, a system automatically search the correct shift position, so that the measurement accuracy and stability of conductivity parameters can be improved.

Description

technical field [0001] The invention relates to the field of electrochemical measurement, in particular to an improved microcontroller-based solution conductivity measuring instrument. Background technique [0002] With the continuous development of electrochemical measurement technology, application systems centered on microcontrollers are gradually replacing analog and non-intelligent systems. Therefore, the design of the measuring instrument for the conductivity of the electrode solution has gradually changed to an intelligent system centered on a microcontroller. Analog and non-intelligent electrical instruments generally have disadvantages such as complex analog circuits, easy to be interfered, large equipment, cumbersome operation, and single function. Contents of the invention [0003] The purpose of the present invention is exactly in order to overcome the weak point of traditional analog instrument and non-intelligent equipment, proposes a kind of solution conduc...

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Problems solved by technology

Analog and non-intelligent electrical instruments generally have disadvantages such as complex analog circuits, easy to be interfered, large equipment, cumbersome operation, and single function.

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