Current monitor uses Hall sensor

The Fig 1 circuit uses a Hall-effect sensor, consisting of an IC that resides in a small gap in a flux-collector toroid, to measure dc current in the range of 0 to 40A. You wrap the current-carrying wire through the toroid; the Hall voltage V_H is then linearly proportional to the current (I). The current drain from V_B is less than 30 mA.

o monitor an automobile alternator’s output current, for example, connect the car’s battery between the circuit’s V_B terminal and ground, and wrap one turn of wire through the toroid. (Or, you could wrap 10 turns—if they’d fit—to measure 1A full scale.) When I=0V, the current sensor’s (CS₁’s) V_H output equals one-half of its 10V bias voltage. Because regulators IC₁ and IC₂ provide a bipolar bias voltage, V_H and V_OUT are zero when I is zero; you can then adjust the output gain and offset to scale V_OUT at 1V per 10A

ell us your most innovative and unusual idea of how you would use the R&S®Scope Rider. If your use-case is among the 10 most inspired, you’ll get the chance to show us your idea in a in a 2-minute video. 10 runners-up will each receive a GoPro camera to keep and a loan R&S®Scope Rider to create a video of their own. The best video will get to keep the R&S®Scope Rider.

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