RE: CurSns3 – Current Shunt Test. Big errors are posible!

jw0752 — Mon, 02 Mar 2015 17:34:23 GMT

Hi Peter,

Thanks for the informative post.

John

RE: CurSns3 – Current Shunt Test. Big errors are posible!

michaelkellett — Mon, 02 Mar 2015 15:10:16 GMT

I expect you know this but there is (usually) very little point in measuring AC mains current with a high side current sense resistor - much better (safer, cheaper) using a current transducer or a current transformer.

There are many DC cases when measuring high side current is necessary and at lower voltages a series sense resistor and either a specialised high side current measuring chip or op amp with the required common mode range can be a good choice.