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ｐＨＳ - 3Ｃ型酸度计是化学分析中广泛使用的测量水溶液 ｐＨ值的 3位半数字显示仪器。其实质上是一台具有很高输入阻抗的直流毫伏计。该仪器工作一段时间后 ,有些仪器经检定后会发现电计输入阻抗下降 ,不能满足检定规程的要求。这时 ,可以结合输入部分的电路图 1,从以下几方
The pHS - 3C pH meter is a 3 and a half digit display instrument widely used in chemical analysis to measure the pH value of aqueous solution. It is essentially a DC millivoltmeter with a very high input impedance. After some time of operation of this instrument, some instruments will find that the input impedance of the electricity meter will drop after being verified and can not meet the requirements of verification procedures. At this time, you can combine the input part of the circuit diagram 1, from the following parties