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Re: Re: Ammeter Problem
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Posted by txblu on June 23, 2004 at 05:32:21 from (199.46.199.231):
In Reply to: Re: Ammeter Problem posted by Ron on June 23, 2004 at 04:23:49:
Interesting comments. Most measurement meters use D'Arsenval meter movements which are made up of an armature of very fine wire in a magnetic field. I can understand requiring a shunt with this type of metering and the shunt is merely an accurately calibrated piece of material, deliberately very large to prevent any error due to the shunt heating with higher currents. The meter then merely acts as a very low voltage volt meter, measuring the small voltage across the shunt caused by the current thru it. There is also an iron vane, which is very rugged and could operate on it's own. I don't remember it's physical makeup, but I do remember it is very simple, uses no fine wire but is not as accurate as the former....course you don't need much accuracy in this application. The ammeter in tractors (that I know) is too small physically to have one internally and I have never seen one external. So I'm guessing that it's an iron vane movement and once the internal wire opened, if wired normally, all power would be lost except the high current starting circuit from the battery thru starting solenoid to starter. Course you couldn't use it as you had no current path to energize the solenoid when you hit the start button. Mark
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