I have built a remotely controlled power strip that measures voltage, current and active power values. In the project I use a Wemos D1 mini connected to a relay and a PZEM-004T measurement module. Everything is controlled by the Blynk app. It works and I am happy with the results, but the whole thing needs to be described. In connection with this, my promoter asked me to determine with the accuracy to which harmonic the PZEM module determines power . The manufacturer does not provide such information, nor can I find much about the method of measurement (some calculation algorithm) or THD. The current is measured by an external coil and the voltage is determined by a voltage divider.
The only thing I was able to find on the internet is the accuracy with which the module performs measurements expressed in percentage and the resolution with which it transmits measurements to the ESP8266.
Perhaps there is someone here who is able to answer my question. I am sending the data from the manufacturer as an attachment.
Apologies if I have put the post in the wrong place and please move to the correct one.
The only thing I was able to find on the internet is the accuracy with which the module performs measurements expressed in percentage and the resolution with which it transmits measurements to the ESP8266.
Perhaps there is someone here who is able to answer my question. I am sending the data from the manufacturer as an attachment.
Apologies if I have put the post in the wrong place and please move to the correct one.
