Fluke Fluke 4325155 Data Sheet

The new Fluke 1623-2 and 
1625-2 GEO Earth Ground 
Testers offer data storage 
and download capabilities  
via USB port. World class 
accessories will simplify  
and speed up testing time. 

•

 

3- and 4-pole Fall of Potential, 

earth resistance loop testing

•

 

4-pole Soil Resistivity testing

•

 

Selective earth ground rod 

testing using 1 clamp

•

 

Stakeless earth ground rod 

testing using 2 clamps

•

 

IP56 rated for outdoor use

•

 

Professional carrying case

•

 

USB data storage and transfer

•

 

Automatic Frequency Control 

(AFC) - identifies existing 

interference and chooses  

a measurement frequency  

to minimize its effect,  

providing 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  

quicker testing

The Fluke 1623-2 and 1625-2 

earth ground testers are able to 

measure earth ground loop resis-

tances using only clamps. With 

this test method, two clamps are 

placed around the earth ground 

rod and each are connected to the 

tester. No earth ground stakes are 

used at all. A known, fixed voltage 

is induced by one clamp and the 

current is measured using the  

second clamp. Then the tester  

automatically determines the 

resistance of the earth ground rod.

This test method only works 

if a bonded earth ground system 

exists for the building or structure 

under test, but most are. If there 

is only one path to ground, like at 

many residential applications, the 

Stakeless method will not provide 

an acceptable value and the Fall 

of Potential test method must  

be used.

With Stakeless testing, the 

earth ground rod does not need 

to be disconnected—leaving the 

bonded earth ground system 

intact during test. Gone are the 

days of spending time placing 

and connecting stakes for each  

earth ground rod on your system—

a major time saver. You can also 

perform earth ground tests in 

places you’ve not considered 

before: inside buildings, power 

pylons, or anywhere you don’t 

have access to soil.

The Fluke 1623-2 and 1625-2 

are distinctive earth ground  

testers that can perform all  

four types of earth ground  

measurement:

•

  3- and 4-Pole Fall of Potential 

(using stakes)

•

  4-Pole Soil Resistivity testing 

(using stakes)

•

  Selective testing (using 1 clamp 

and stakes)

•

  Stakeless testing (using 2 

clamps only)

The testers are also easy to 

use. For each test,  

the testers inform you which 

stakes or clamps need to be 

connected and the large rotary 

switch can be used even with a 

gloved hand.

The complete model kit comes 

with the 1623-2 or 1625-2  

tester, test leads, 4 earth ground 

stakes, 3 cable reels with wire,  

2 clamps, batteries, and manual—

all inside a professional Fluke 

carrying case.