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What is overdrive?

To close a set of reed contacts takes a certain amount of force.  At this point the contact resistance may be relatively high because there is no force pressing the contacts together. So typically we use a 40% overdrive.  This means if the contact close with 2 volts applied we will apply 40% above that to measure the contact resistance.  So we would measure the contact resistance at 2.8 volts.

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