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酸度计(PH计)是常用的一种测试仪器,使用时遇见的故障,往往不是由于电器元件方面的原因,而是因维护或使用不当造成的。本文谈谈仪器维护、保养方面的一些体会。 常用的25型、PHS—2型等酸度计的工作条件之一是输入信号必须是高阻抗,如果输入信号的阻抗较低,将会导致测量结果不准确。为此,输入信号源的电极插头和插口必须保持干燥和清洁,电极引出线与屏蔽线要绝缘良好;读数开关也要干燥,才不会因漏电或屏蔽不好而降低阻抗,致使测量不稳定,甚至无法进行。日常维护方法是:
Acidity meter (PH meter) is a commonly used test equipment, the use of the failure encountered, often not because of electrical components, but because of improper maintenance or use caused. This article talk about equipment maintenance, maintenance of some experience. One of the commonly used operating conditions for pH meters such as Model 25 and PHS-2 is that the input signal must be high impedance. If the impedance of the input signal is low, the measurement result will be inaccurate. For this reason, the electrode plug and socket of the input signal source must be dry and clean, and the lead wire of the electrode should be well insulated from the shielded wire. The reading switch must also be dried so that the impedance will not be lowered due to leakage or poor shielding, resulting in unstable measurement , Or even impossible. Routine maintenance methods are: