Simple R, L, C measuring instrument is to enable people to compare the convenience of resistance, capacitor, and inductive measurement, is in line with people's fast-paced life measurement instruments, simple measuring instrument has many advantages, such as: convenient and simple, accurate and accurate, the overall size is small, easy to carry, relatively simple operation and so on. To design a simple measuring instrument, we need to learn not only simple simulation electrons and related microcontroller knowledge, but also learn c language programming applications, to be artificially designed. The design of the simple measuring instrument is varied, often the design principle is to use frequency measurement to indirectly find out the corresponding resistance capacitor inductor size, the resistance R, capacitive L, inductor C into frequency signal frequency f, often used in the conversion principle is RC oscillation circuit and LC capacitive three-point oscillation circuit. To obtain frequency f, the measured frequency f can be obtained by the microcontroller's counting function, and then the parameter value of the resistor capacitor inductor can be easily calculated using the known frequency f, and the data is sent to display after processing.<br><br>Keywords: frequency, simple measuring instrument, capacitive three-point oscillation circuit
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