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国外最近生产出一种微微安电流表,能够测量出电路中微达0.03微微安的电流.它有以下一些特殊用途:测量用固体元件组成的各种设备中的漏电电流;测量电容器的漏电电阻;将电离压力计、厚度计、光电管、质谱仪等仪器中的信号加以放大和测量.此仪器有20个直流测试范围,满刻度自0.3微微安至1毫安.仪器内除输入电路使用一只静电计管外,其余部分(包括电源供给电路)全部使用固体元件.电源供给
Recently, a micro ampere meter has been manufactured abroad to measure the micro current of 0.03 microampere in the circuit. It has some special purposes as follows: measuring the leakage current in various devices composed of solid components; measuring the leakage resistance of the capacitor; The ionization gauge, thickness gauge, photocell, mass spectrometer and other instruments to amplify and measure the signal.This instrument has 20 DC test range, full scale from 0.3 picoamp to 1 milliamp.In addition to the instrument input circuit using a Only static meter tube, the rest (including the power supply circuit) all use solid components. Power supply