Lincoln Electric Power Wave S350 Operator's Manual page 13

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Both Sense leads are out of the current paths.
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Both Sense leads detect arc voltage accurately.
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No voltage drop between Arc and Sense leads.
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Best start, best arcs, most reliable results.
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For circumferential applications, connect all work leads on one side of the weld joint, and all of the work voltage
sense leads on the opposite side, such that they are out of the current path.
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