Testing Methods

* 3- and 4-Pole Fall of Potential – standard earth ground testing using two ground stakes
* 4-Pole Soil Resistivity testing – determine soil resistivity using four ground stakes
* Selective testing – without disconnecting ground rods, a technician can measure ground resistance using a combination of stakes and a clamp.
* Stakeless testing – innovative solution using only clamps, instead of ground stakes, to measure earth ground loop resistance.

The Fluke 1625 offers these advanced features

* Automatic Frequency Control (AFC) – identifies existing interference and chooses a measurement frequency to minimize its effect, providing a more accurate earth ground value.
* R* measurement – calculates earth ground impedance at 55 Hz to more accurately reflect the earth ground resistance that a fault-to-earth ground would see.
* Adjustable limits – for quick test result verification.