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本文介绍了pHJ6400型pH计用阻抗检测器的缺陷和改进方法。 pH计电极间的电阻相当高,为了能从高内阻的信号源中取出信号电压,仪器设计了专用的高输入内阻放大电路,因而在《JJG119-84实验室pH(酸度)计检定规程》和《JJG390-85船用pH计检定规程》中明确了对电计输入电流、输入阻抗引起的示值误差的检定需串接高阻。根据规程要求,市场已推出了pHJ 6400型pH计用阻抗检测器(以下称阻抗器)及屏蔽连接线。阻抗器原理及厂家提供的检定系统连接图
This article describes the pHJ6400 pH meter impedance detector defects and improved methods. pH meter electrode resistance is quite high, in order to be able to take out the signal voltage from the high resistance signal source, the instrument designed a dedicated high-input internal resistance amplifier, so in the “JJG119-84 laboratory pH (acidity) meter verification procedures ”And“ JJG390-85 marine pH meter verification procedures ”made clear the input current meter, the input impedance of the indication error caused by the need to connect high impedance. According to the rules and requirements, the market has introduced the pHJ 6400 pH meter impedance detector (hereinafter referred to as the resistor) and shielded cable. Impedance principle and the test system provided by the manufacturer connection diagram