> In college we used A Wheatstone bridge to accurately measure resistance.
I think the Wheatstone bridge circuit is implemented in many multimeters, particularly analog meters. But by itself, the Wheatstone bridge doesn't solve the problem of lead resistance. To do that, you need to eliminate current through the test leads. Which is what a four-wire measurement does. You have separate 'source' and 'sense' leads; all the test current goes through the source leads while the sense leads measure voltage. Since the input impedance of a DMM is typically 10 megohms, the voltage drop through the sense leads is insignificant.
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Today's Featured Article - Tractor Profile: Allis-Chalmers Model G - by Staff. The first Allis-Chalmers Model G was produced in 1948 in Gasden, Alabama, and was designed for vegetable gardeners, small farms and landscape businesses. It is a small compact tractor that came with a complete line of implements especially tailored for its unique design. It featured a rear-mounted Continental N62 four-cylinder engine with a 2-3/8 x 3-1/2 inch bore and stroke. The rear-mounted engine provided traction for the rear wheels while at the same time gave the tractor operator a gre
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