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Do-It-Yourself (DIY) Question & Answer Forum
Nulling Test Leads
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<blockquote data-quote="Geoff1946" data-source="post: 500621" data-attributes="member: 28452"><p>Think it through logically. Say your leads have a resistance of 1 ohm. </p><p></p><p>If doing continuity, perhaps the circuit may be 4 ohms, so an error of 1 ohm is significant. So set the instrument to cancel out, (null), the lead's resistance.</p><p></p><p>Now, consider doing insulation. Let's say you are looking to measure greater than 4 Mohm, (four million). Ask yourself if that 1 ohm test lead resistance is relevant. </p></blockquote><p></p>
[QUOTE="Geoff1946, post: 500621, member: 28452"] Think it through logically. Say your leads have a resistance of 1 ohm. If doing continuity, perhaps the circuit may be 4 ohms, so an error of 1 ohm is significant. So set the instrument to cancel out, (null), the lead's resistance. Now, consider doing insulation. Let's say you are looking to measure greater than 4 Mohm, (four million). Ask yourself if that 1 ohm test lead resistance is relevant. [/QUOTE]
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