Fluke Fluke 4325162 Data Sheet

Product codes
4325162
Page of 10
Technical Data
Fluke 1623-2  
and 1625-2
GEO Earth Ground Testers
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. 
Product features:
 
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
In addition, the Fluke 1625-2 
offers these advanced features:
 
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
Stakeless 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 most complete testers
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.