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采用晶体管特性曲线图示仪可以方便地测量电容值,这对于工程试验和测试颇有价值。因为应用电容测试仪精密测量电容值比较繁琐,而图示仪可以迅速测定电容量大小,从200P直至数微法,其精度在工程上是足够的。图示仪测量电容,其原理基于图示仪中集电极扫描电压为50Hz全波整流后的脉动波,此100Hz脉动波峰值连续可调(以JT—1图示仪为例,峰值0～20V和0～200V二种连续可调)。它在零点附近斜率突然变化,因此可用来测量电容值。
The use of transistor characteristics curve can easily measure the capacitance value, which is valuable for engineering testing and testing. Because the application of capacitance tester precision measurement of capacitance is more complicated, and the graphical instrument can quickly determine the size of the capacitance, ranging from 200P until the number of micro-method, its accuracy is sufficient in engineering. The meter measures the capacitance. The principle is based on the pulse waveform after the collector scan voltage is 50Hz full wave rectified in the graphic meter. The peak value of the 100Hz ripple wave is continuously adjustable (taking the JT-1 as an example, the peak value is 0-20V And 0 ~ 200V two kinds of continuously adjustable). It has a sudden change in slope near zero and can therefore be used to measure capacitance.