ipq
Newbie level 3
Hello,
I'm working on a project where I must measure the AC current of a low consumption lamp (~120mA) and send it via RF using a MCU. The point is:
I have found different methods to measure AC current and there's one of them which I do not understand. It is the method used by the kill-a-watt units:
https://reindeerflotilla.files.wordpress.com/2011/08/kill-a-watt.png
Could anyone explain how it is working? Please shed light on the matter
Thank you in advance! :thumbsup:
P.S: Before this method I tried the well-known ACS723 but the values obtained were wrong compared to an ammeter
I'm working on a project where I must measure the AC current of a low consumption lamp (~120mA) and send it via RF using a MCU. The point is:
I have found different methods to measure AC current and there's one of them which I do not understand. It is the method used by the kill-a-watt units:
https://reindeerflotilla.files.wordpress.com/2011/08/kill-a-watt.png
Could anyone explain how it is working? Please shed light on the matter
Thank you in advance! :thumbsup:
P.S: Before this method I tried the well-known ACS723 but the values obtained were wrong compared to an ammeter