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pHs-2型酸度计是电化学分析仪器,它用于测定水溶液的pH值和电极电位。本文着重介绍电计的检查和故障排除,凡涉及到的线路元器件均对应于仪器说明书中的编号和参数。一,电计线路原理概述线路中两个配对的变容二极管D_1、D_2与电感L_1、L_2组成交流桥路。在电计通电时,电感L_3两端产生的自感电动努感应到L_1、L_2两端。由于D_1、D_2的电容量略有差异,桥路中的输出端有一交流电压输出,经交流放大器进行放大,在L_3两端得到了放大的交流信号,再耦合到L_1、L_2两端,这样反复循环,就会在L_1、L_2两端形成了等幅振荡的交流电压信号。信号的频率取决于D_1、D_2的电容量和L的电感量;信号的电压幅度取决干D_1、D_2的电容量。当电计输入正电压时,D_1电容量增加,D_2
The pHs-2 pH meter is an electrochemical analyzer used to determine the pH and electrode potential of aqueous solutions. This article focuses on the inspection and troubleshooting of electrical meters, where the circuit components involved correspond to the number and parameters in the instrument manual. First, the principle of electrical meter line Overview Two paired varactor diodes D_1, D_2 and inductance L_1, L_2 form an AC bridge. When the meter is powered on, the self-inductance of the inductor L_3 induces noises at both ends of L_1 and L_2. Due to the slightly different capacitance of D_1 and D_2, there is an AC voltage output at the output of the bridge, which is amplified by the AC amplifier. The amplified AC signal is obtained at both ends of L_3 and then coupled to both ends of L_1 and L_2. Cycle, it will be in L_1, L_2 formed at both ends of the amplitude of the oscillation of the AC voltage signal. The frequency of the signal depends on the capacitance of D_1, D_2 and the inductance of L. The voltage amplitude of the signal depends on the capacitance of D_1, D_2. When the electricity meter inputs the positive voltage, the D_1 electric capacity increases, D_2