论文部分内容阅读
使用XSJ－38／6型流量积算仪时，在注水的配注量较低的情况下，信号输入幅度小而使计量精度受到影响。分析知，造成这种现象的原因之一是由于该仪表的控制线路中的电阻（R0）的存在，它可将原信号衰减为67％，导致前级放大性能变差；原因之二是控制线路中的电容（C2）容量小，这样使放大器的通频带受到限制。为此对原控制线路进行改造，首先减小线路电阻去掉R0，其次增大线路电容，将C2的容量由0．047μF改为4．7μF，三为提高放大器的放大能力，在线路中增加了R44的旁通电容Ce。
When using the XSJ-38/6 flow totalizer, when the amount of injected water is low, the signal input amplitude is small and the measurement accuracy is affected. Analysis shows that one of the reasons for this phenomenon is due to the presence of resistance (R0) in the control circuit of the instrument, which can attenuate the original signal to 67%, resulting in deterioration of the preamp performance; the second reason is the control Capacitance (C2) in the circuit is small, so that the amplifier pass band is limited. To this end of the original control circuit transformation, first of all to reduce the line resistance to remove R0, followed by increasing the line capacitance, the C2 capacity from 0.047μF to 4.7μF, three to improve the amplifier’s amplification capability, an increase in the line R44 by-pass capacitor Ce.