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BSM300GB120DLC

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File Size : 116 KB Manufacturer:97 Description:Like all capacitance sensors, the BSM300GB120DLC relies on Kirchoffs Current Law (Figure 1-5) to detect the change in capacitance of the electrode. This law as applied to capacitive sensing requires that the sensors field current must complete a loop, returning back to its source in order for capacitance to be sensed. Although most designers relate to Kirchoffs law with regard to hardwired circuits, it applies equally to capacitive field flows. By implication it requires that the signal ground and the target object must both be coupled together in some manner for a capacitive sensor to operate properly. Note that there is no need to provide actual hardwired ground connections; capacitive coupling to ground (Cx1) is always sufficient, even if the coupling might seem very tenuous. For example, powering the sensor via an isolated transformer will provide ample ground coupling, since there is capacitance between the windings and/or the transformer core, and from the power wiring itself directly to 'local earth'.