hello, my clamp on ammeter is rated for 400 amps max. I am looking into increasing this to 4000 amps. I know that it is possible, but looking for some more input and suggestions. I could possibly wind my own 10:1 transformer but not exactly sure how to go about it. please advise! ty

 

Perhaps you could unwind 90% of the turns on the existing transducer?

 

There is a shunt resistor inside the meter to calibrate the range. Take it out, divide by 10, and put a different resistor in.

 

There is a shunt resistor inside the meter to calibrate the range. Take it out, divide by 10, and put a different resistor in.

I would worry about overheating the transducer. Have you done this at 4000 Amps?

 

Those transducers are built for about a milliamp, but overheating is a thing to consider. Be sure to run the numbers,lokey.

 

I doubt a 400a rated clamp would fit a 4000a rated wire.

 

Just had an idea:

Opening the clamp should attenuate the reading. If you have a calibrated current source, perhaps you could determine the gap size that gives you 90% attenuation? Not sure if this would work with all geometries and positioning of the wire, but you lose nothing by trying...