Hi.
I see on ebay that sell these instruments at the same time can measure Volts and Current, very cheap cost and high sensitivity.
Can use one CT simultaneously to measure Volts and Current ?
Thanks.
Can use one CT simultaneously to measure Volts and Current ?
Submitted by tinamore on Sun, 14/06/2015 - 13:34»
Re: Can use one CT simultaneously to measure Volts and Current ?
Isn't it reading the voltage via the wired connection, and the current via the CT?
Paul
Re: Can use one CT simultaneously to measure Volts and Current ?
I strongly suspect that the device illustrated is double-insulated, which means that you can have a galvanic connection to the mains supply. It also means that you cannot connect anything else to that display in order to extract the data and use it elsewhere, unless you do so by radio or by an opto-coupler that meets the requirements of isolation and creepage distances.
But to answer the question in the title - No. A CT has no knowledge of the voltage on the cable on which it sits - there is no direct galvanic connection, which is a necessary condition for your safety.
Re: Can use one CT simultaneously to measure Volts and Current ?
@Robert Wall: thank you very much. Seems, I understood. I will learn more about measurement the voltage and current.
(Sorry for my English)