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Thread: High Current Ammeter

  1. #1
    FLAC
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    High Current Ammeter

    Hi guys,

    I'm looking for an ammeter capable of measuring current above 100 amps. I have a pretty demanding sound system, will be adding a computer to that, and I'd like to be able to keep an eye on how much current I'm drawing at all times. My alternator is able to produce 120 amps, and my sound system can pull that much on its own assuming my trunk is 100 degrees and the volume is all the way up.

    Where can I find such an ammeter?
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  2. #2
    FLAC
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    Im guessing an ammeter capable of measuring 100 amps is going to be expensive. A cheaper method would be to buy a shunt resistor capable of 100 amps, measure the voltage drop across the resistor, then use ohms law to calculate the current.
    EDIT: nvm:
    http://www.outsidesupply.com/index.a...ROD&ProdID=254

    Might pick one up for myself.

  3. #3
    FLAC
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    Hmn, I had looked around for one and couldn't find one. Good find.
    Also, good call on the current shunt. I should have thought of that. Now I can get that info onto the computer's display.
    My Nearly Complete Car:
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    Micro Control Center... Control Your Car Across the Internet
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    Website: (It's a work in progress, really. All my projects have taken me from ever really developing it.)
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  4. #4
    FLAC
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    Too bad these guys are so expensive...
    http://www.outsidesupply.com/index.a...ROD&ProdID=259
    That would make life so much easier.
    My Nearly Complete Car:
    http://www.mp3car.com/vbulletin/show...ed-car-pc.html

    Micro Control Center... Control Your Car Across the Internet
    http://www.mp3car.com/fusion-brain/1...-internet.html

    Website: (It's a work in progress, really. All my projects have taken me from ever really developing it.)
    http://paulfurtado.com/

  5. #5
    Variable Bitrate billmee's Avatar
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    I have one of these;
    http://www.sears.com/shc/s/p_10153_1...0P?vName=Tools

    It'll do 400 amps for $60.

    The only thing it lacks is peak hold, it would be fun to see how much current my starter pulls on a really cold day.

  6. #6
    Constant Bitrate
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    Quote Originally Posted by billmee View Post
    I have one of these;
    http://www.sears.com/shc/s/p_10153_1...0P?vName=Tools

    It'll do 400 amps for $60.

    The only thing it lacks is peak hold, it would be fun to see how much current my starter pulls on a really cold day.
    Hmmm, now thats a good idea. Does it have any kind of external interface, I have seen some meters that you can connect to COM or USB..

  7. #7
    FLAC
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    Quote Originally Posted by Civic Modz View Post
    Hmmm, now thats a good idea. Does it have any kind of external interface, I have seen some meters that you can connect to COM or USB..
    I actually went out and bought this, and, unfortunately, it does not have an external interface.
    My Nearly Complete Car:
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    Micro Control Center... Control Your Car Across the Internet
    http://www.mp3car.com/fusion-brain/1...-internet.html

    Website: (It's a work in progress, really. All my projects have taken me from ever really developing it.)
    http://paulfurtado.com/

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