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Unread 06-02-2003, 16:43
bigqueue bigqueue is offline
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Talking Re: current measurement?

Quote:
Originally posted by CHSguard72
bigqueue, you talked about measureing the current over the breakers to check the current going to the motors, how exactly does that work? I am trying to find a way to do exactly that, measure the current drawn by my 2 main drive motors. How/Where do you physically connect up wires to test this, and do I need a custom circuitry board to interpret this voltage measured? Thanks for the help.
I have written a short whitepaper on this. You can see it at:
http://www.chiefdelphi.com/forums/pa...le&paperid=155

You basically use an Op-AMP that has a common mode voltage at and/or above the power rail. Then you build a difference amp, and measure across the breaker.
(actually, the side at the top of the breaker has to be done through a separate breaker because of the 1st rules of connection....but the current through that breaker is so low powering the OP-AMP that the drop is essentially zero)

Look at that paper and tell me what you think. Then, ask me any questions and I will answer them. (I can also get you a full schematic and board layout if you want)

-Quentin
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