Cable checking circuit structure and common-line-free cable checking method
A technology for calibrating circuits and calibrating methods, applied in the direction of measuring electricity, measuring electrical variables, measuring devices, etc., can solve problems such as wasted man-hours, instrument burnout, instrument can not work normally, etc., to achieve the effect of convenient line calibration
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[0032] Below in conjunction with accompanying drawing and embodiment the present invention is further described: as figure 1 As shown in , the structure of the cable verification circuit includes a verification signal sending end device circuit and a verification signal receiving end device circuit connected by the tested cable 3, and the tested cable 3 includes at least 2 tested cables Line 7.
[0033] Taking the signal coupler as an example of an optocoupler, the line across the calibration signal sending end and the calibration signal receiving end only needs the tested cable 7 itself without a common reference end, and each tested cable calibration line includes a current limiting resistor 2 and the signal coupler 6 of the measured cable 7, the isolation diode 4, and the signal coupler 6 of the calibration signal receiving end connected sequentially from the equipment interface of the verification signal sending end; The anode of the light-emitting tube is connected, the ...
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