Datasheet

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.