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With all these power meter devices, the thing which you must consider is the nature of the load you are connecting. A switch mode power supply running at 100kHz may not be represented properly by a circuit that is designed for a maximum frequency of 100Hz. The smoothing algorithms used to approximate power consumption require some knowledge of what is connected to accurately determine the true load.
I looked at the Watts Up / Doc Wattson and it seems to handle electronic speed controllers, which is a good sign. The docs did not specify the max frequency. But check it for yourself.
Regards,
TB
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