Posted by John T on November 17, 2009 at 09:01:53 from (66.244.97.31):
In Reply to: Electrical experts? posted by Dave H (MI) on November 17, 2009 at 07:53:46:
Sure you can bench test it, thats the same thing it does when its on the tractor, a wire is placed in its cradle and it senses and measures the current flow therein. That saves having two terminals, just let the wire be in the right place and BY MAGIC LOL it registers current...
Faraday's (hes long dead) principle of electromagnetic induction tells us if you pass a magnet by a coil of wire (or the wire past the magnet no difference) voltage is induced and similar, current flow in a wire produces a magnetic field around it and the greater the current the stronger the magnetic field.
Those ammeters are induction type because current flow induces a magnetic field and its that magnetic field strength that is being computed and converetd into current flow so the needle deflects
The faster the magnet passes by the wire (or wire past magnet) the more voltage induced which is why a gennys output inctreases if you spin it faster.
One problem is as the distance from the wire increases the field strength decreases so placement of the wire and its insualtion thickness etc affects the reading...
Id rig up a bench test that uses the same wire gauge and insulation as on the tractor and select voltages and resistances to get a range from 0 to 30 amps or so n see what the ammeter registers PIECE OF CAKE
Ol John T NOT any expert but Ive been around electrical things n been to a rodeo and a couple goat ropings FWIW
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