ST is aiming at compliant 3 phase watt meters with an evaluation kit built around the STPMS2 double channel 24bit second-order ΣΔ modulator. Called EVALSTPM-3PHISO, it measures through a voltage divider and current shunt for each phase. “Sensing circuitry and PCB layout are optimised to maximise signal-to-noise ratio for accuracy,” said the company. The STPMS2 oversamples ...
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