A non-invasive slow current measuring instrument and its preparation method
A current measuring instrument, non-invasive technology, applied in the direction of measuring devices, measuring electrical variables, measuring current/voltage, etc., can solve the problems of small dynamic range of current transformer measurement, inability to meet top drop, iron core hysteresis, etc. Achieve the effect of improving low-frequency response performance, extending top-down time, and wide bandwidth
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[0052] The non-invasive slow current measuring instrument in this example mainly improves the measuring instrument probe and amplifying circuit, and the rest of the structure and components are the same as the existing circuit measuring instrument. In this example, the measuring instrument probe and the amplifier circuit are improved, such as image 3 As shown, the measuring instrument probe includes a magnetic ring, a primary winding, a secondary winding Ns and a feedback winding Ns f ; primary winding, secondary winding Ns and feedback winding N f Insulated from each other and wound on the same magnetic ring; the two lead wires of the primary winding are used to connect the current to be measured; the two lead wires of the secondary winding are respectively connected to the positive and negative poles of the input terminal of the amplifier circuit; the amplifier circuit includes an IV conversion circuit And two operational amplifier outputs, among the two operational amplif...
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