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Electrical resistivity: Contact Resistance

Electrical resistivity: Contact Resistance

Electrical resistivity: Contact Resistance

(OP)
I am in need of a simple field test for determining the contact resistance of probes/pins being used in electrical resistivity investigations.  I need to determine the contact resistance between the probe/pin and the surrounding earth material.  This would apply to the non-automated type of resistivity meter.  I am certain there is a way to do this using a typical multimeter/DVM, or perhaps a Megger(tm).  Any suggestions would certainly be appreciated.

Sincerely,
Rockjoint

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