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<p>[QUOTE=&quot;Bacchus, post: 8600457, member: 759&quot;]I agree that using a DMM’s resistance function will be futile unless the meter has 1 micro ohm resolution.</p><p><br /></p><p>If I were to try this I would go with a four wire test.&nbsp; Get a current source capable of maybe 1 amp and connect it to the coin, with a current meter inline to measure the actual current.&nbsp; Then get a second meter to measure voltage at the current source contacts spots, using a separate pair of wires.&nbsp; 1 amp through 1 micro ohm would be 1 microvolt.&nbsp; Divide the measured voltage by the measured current to get the resistance.</p><p><br /></p><p>The advantage of this technique is that I can measure much smaller current and voltage with a meter than I can resistance, and the voltage drop on the current source leads would not affect the voltage measurement.</p><p><br /></p><p>Still might not work for reasons already stated (dirt on coin, etc.) but I think it would have a better chance than trying to use the resistance function on a &quot;standard&quot; DMM.[/QUOTE]</p><p><br /></p>

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