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Fluke 1623/1625
GEO Earth Ground Testers

• One-button measurement concept
• 3- and 4-pole earth ground measurement
• 4-Pole soil resistivity testing
• 2-pole resistance measurement AC
• Selective testing, no disconnection of ground conductor (1 clamp)
• Stakeless testing, quick ground loop testing (2 clamps)
• Measuring frequency 128 Hz

1625 Features

• 3- and 4-pole earth ground measurement
• 4-Pole soil resistivity testing
• 2-pole resistance measurement AC
• 2- and 4-pole resistance measurement DC
• Selective testing, no disconnection of ground conductor (1 clamp)
• Stakeless testing, quick ground loop testing (2 clamps)
• Earth impedance measurement at 55 Hz
• Automatic frequency control (AFC) (94, 105, 111, 128 Hz)
• Measuring voltage switchable 20/48V
• Programmable limits, settings
• Continuity with buzzer

• 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.

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