User line checking device
A technology for user lines and users, which is applied in the direction of measuring devices, digital measurement technology for measurement, instruments, etc., can solve the problems of affecting the user's power consumption and low accuracy, and achieve the effect of accurate, fast and simple operation
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[0054] Further, see figure 2 , as a specific implementation manner, the characteristic signal generation unit 200 may include a power conversion module 201 , a single-chip microcomputer control module 202 , a photoelectric isolation protection module 203 and a current injection module 204 .
[0055] Specifically, the power conversion module 201 is connected to the single-chip control module 202 and is used to convert the user's alternating current into direct current and supply power to the single-chip control module 202 . The single-chip microcomputer control module 202 is connected with the photoelectric isolation protection module 203, and is used to control the current injection module 204 to generate a corresponding characteristic signal according to the trigger button. The photoelectric isolation protection module 203 is connected with the current injection module 204 and is used to complete the mutual isolation between the electrical signal output by the single-chip co...
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