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
We sell tractor parts! We have the parts you need to repair your tractor - the right parts. Our low prices and years of research make us your best choice when you need parts. Shop Online Today. [ About Us ]
Today's Featured Article - Maintaining Rubber Tires - by Staff. The broad use of rubber tires on farm tractors and machinery has resulted in a great saving in both time and operating costs since the time of steel wheels. There are, however, certain basic fundamentals in the care of tires that should be followed carefully if the owner is to derive maximum benefit from his or her investment. First and most important is to maintain proper pressure for the work at hand. Your best guide to proper inflation is the operator's manual or instruction book tha
... [Read Article]
Latest Ad:
1964 I-H 140 tractor with cultivators and sidedresser. Starts and runs good. Asking 2650. CALL RON AT 502-319-1952
[More Ads]
All Rights Reserved. Reproduction of any part of this website, including design and content, without written permission is strictly prohibited. Trade Marks and Trade Names contained and used in this Website are those of others, and are used in this Website in a descriptive sense to refer to the products of others. Use of this Web site constitutes acceptance of our User Agreement and Privacy Policy
TRADEMARK DISCLAIMER: Tradenames and Trademarks referred to within Yesterday's Tractor Co. products and within the Yesterday's Tractor Co. websites are the property of their respective trademark holders. None of these trademark holders are affiliated with Yesterday's Tractor Co., our products, or our website nor are we sponsored by them. John Deere and its logos are the registered trademarks of the John Deere Corporation. Agco, Agco Allis, White, Massey Ferguson and their logos are the registered trademarks of AGCO Corporation. Case, Case-IH, Farmall, International Harvester, New Holland and their logos are registered trademarks of CNH Global N.V.
