increasing the range of clamp on ammeter

Discussion in 'The Projects Forum' started by lokeycmos, May 2, 2013.

  1. lokeycmos

    Thread Starter Active Member

    Apr 3, 2009
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    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
     
  2. joeyd999

    AAC Fanatic!

    Jun 6, 2011
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    Perhaps you could unwind 90% of the turns on the existing transducer?
     
  3. #12

    Expert

    Nov 30, 2010
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    There is a shunt resistor inside the meter to calibrate the range. Take it out, divide by 10, and put a different resistor in.
     
  4. joeyd999

    AAC Fanatic!

    Jun 6, 2011
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    I would worry about overheating the transducer. Have you done this at 4000 Amps?
     
  5. #12

    Expert

    Nov 30, 2010
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    Those transducers are built for about a milliamp, but overheating is a thing to consider. Be sure to run the numbers,lokey.
     
  6. GetDeviceInfo

    Senior Member

    Jun 7, 2009
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    I doubt a 400a rated clamp would fit a 4000a rated wire.
     
  7. joeyd999

    AAC Fanatic!

    Jun 6, 2011
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    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...
     
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