Hi,

Output signal of current transformer is 1A, but input of multimeter is 225mV. So, how to convert 1A to 225mV. Is there current tranformer that convert 1A-->225mV.

 

A 0.225Ω resistor will do the job. Connect the transformer, resistor, and meter in parallel.

 

Make sure the resistor rated for the power it will experience.

 

Make sure the resistor rated for the power it will experience.

Just under 1/4W. A 1/2W resistor upwards would suffice.

 

Make certain that the resistor is always connected to the current-transformer output.
Operating it with no load resistor will result in dangerously high voltages, and possible damage to the transformer.

 

Output signal of current transformer is 1A,

Really? That seems high. What is the transformer part number and manufacturer?

ak

 

Hi,

Output signal of current transformer is 1A, but input of multimeter is 225mV. So, how to convert 1A to 225mV. Is there current tranformer that convert 1A-->225mV.

The output of your Current Transformer is more likely 0 to 1.0 amp and 1.0 amp when the CT is at its rated max current. With that in mind rather than deriving an odd voltage I would think about using a simple 0.200 Ohm sand block resistor. The value of 0.200 ohm being more common and with 1.0 amp will show a voltage drop of 0.2 volt or 200 mV. It also makes it easier to convert the voltage drop to current.

You may want to give this a read. You also may want to lend strong consideration to what Crutschow mentions above regarding open circuit voltage.

Ron