Necessaryevil
New Member
I want to build an true rms energymeter or powermeter (AC) some day. I want to use it for measuring power consumption of mains powered devices.
It's not the purpose to built this device soon, at this point I'm more interested in the general theory of operation and probably some recommended parts.
I came up with two ideas:
1)Sample voltage and current (ADC) with a relatively high samplerate and let an microcontroller calculate the power
2)get voltage and current, use an analog multiplier and sample the output of this multiplier with an relatively high samplerate
My question is, what is the best way to do this? How do commercial true rms energymeters do the job?
Stefan
It's not the purpose to built this device soon, at this point I'm more interested in the general theory of operation and probably some recommended parts.
I came up with two ideas:
1)Sample voltage and current (ADC) with a relatively high samplerate and let an microcontroller calculate the power
2)get voltage and current, use an analog multiplier and sample the output of this multiplier with an relatively high samplerate
My question is, what is the best way to do this? How do commercial true rms energymeters do the job?
Stefan
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