Design of Intelligent Circuit Characteristic Tester for Use in Harsh Environments

This paper designs and makes an intelligent circuit characteristic tester. It is used to measure the characteristics of a specific amplifier circuit, and then to intelligently determine the reasons for the failure or change of the amplifier due to the change of components.The intelligent circuit characteristic tester is driven by a single chip microcomputer (MSP32F103V) to produce a 1 kHz sinusoidal excitation signal. The influence of the output module resistance is eliminated by an impedance matching circuit, and the input is measured. The input resistance, output resistance and magnification of the measured circuit are calculated by designing the peripheral resistance at both ends of the tested circuit. The output signal of the measured circuit is filtered for DC noise and then input to the single chip microcomputer by the AD637 DC conversion module. The amplifier's input and output resistance, magnification and fault analysis results are automatically processed and measured by the E76 module.For the result of circuit test, the tester can automatically and accurately judge and display the reason of circuit change within 2 seconds.