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Additionally, with nonlinear loads, a multimeter must have DSP in order to measure properly.
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This is absolutely incorrect. Additional
digital blocks are not required.
DSP is just *a* way of measuring true watt, not a requirement.
Instantaneous voltage times instantaneous current is always instantaneous power.
the integration needs to occur on the multiplied product.
Power measurement can be entirely passive such as a multi-range iron vane panel meter or entirely electronic four quadrant analog multiplier that produces voltage output directly relating to real-time true watts. An entirely analog filter can be fitted to produce a continuous real time integration.
Real time true watts measurements pre-dates any of computer chip driven stuff and these technologies still the cutting edge in many aspects and vastly superior to adequate, but functional low sampling rate multi-pass sampling method used in most China sourced measurement tools do not capture every curvature in every wave cycle.