Image by BC MICH GUARD
U.S. Air Force Tech. Sgt. Patrick Hann, 110th Airlift Wing, 172nd Airlift Squadron obtains air temperatures and wind speeds at ground level in preparation for a cargo air drop, Grayling Air Gunnery Range, Frederic, Mich., Jan. 26, 2013. Hann obtained this information to pass on to the pilots to obtain better accuracy of cargo placement. (U.S. Air Force photo by Tech. Sgt. David Eichaker/released)drop in ranges
Two-wire vs. four-wire resistance measurements
Because the test current (I) causes a small but significant voltage drop across the lead resistances, the voltage (VM) measured by the meter won't be exactly the same as the voltage (VR) directly across the test resistance (R), and considerable error ... drop in ranges
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