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为了适应小电容测量仪器定标的需要,填补我国小电容标准的空白,我们经过几年的努力,研制成功了CO20-G型(1～0.001pF)小电容标准。一、技术指标及结构小电容标准由四只电容器组成,电容器是以惰性气体为介质的标准空气电容器。其主要技术指标列于表1。对于我国目前的情况,士0.1％的精度一般就能满足需要,考虑到今后计量科学事业的发展,我们将指标作了适当提高。电容器均制作成同轴型电极。电极、电极支架等,全部采用殷钢材料,以减小电容器的温度系数。1pF电容器(图1a)的内电极5、外电极8均制成圆筒形,由1、2、7、9四个氧化铝高频瓷环固定在支架上,其容量由两端保护环3、6间的内电极长度确定。用微调螺钉4进行细调,可获得1×10~(-4)的调整精度。
In order to meet the needs of small capacitance measuring instrument calibration, to fill the gap of our small capacitor standards, after years of hard work, we successfully developed the CO20-G type (1 ~ 0.001pF) small capacitance standards. First, the technical indicators and the structure Small capacitor standard consists of four capacitors, capacitors are standard air capacitors with inert gas as the medium. The main technical indicators are shown in Table 1. For the current situation in our country, the accuracy of 0.1% is generally adequate to meet the needs. Taking into account the future development of measurement science, we have made appropriate improvements in our indicators. Capacitors are made into a coaxial electrode. Electrodes, electrode holders, etc., all used invar material to reduce the temperature coefficient of the capacitor. 1pF capacitor (Figure 1a) of the inner electrode 5, the outer electrode 8 are made cylindrical, by 1,2,7,9 four alumina high-frequency ceramic ring is fixed to the bracket, the capacity of the two ends of the ring 3 , 6 the length of the internal electrode to determine. Fine adjustment using the fine adjustment screw 4 can achieve 1 × 10 ~ (-4) adjustment accuracy.