Fluke 1625 data sheet 
Click to download Fluke 1625 datasheet.
The new Fluke 1625 GEO Earth Ground Testers offer an innovative solution, called Stakeless testing, to make your earth ground loop resistance testing quicker and easier. No need for a separate earth ground clamp.
• 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
• Rugged carrying case
In addition, the Fluke 1625 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-toearth ground would see
• Adjustable limits - for quicker testing
• 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-toearth ground would see
• Adjustable limits - for quicker testing
•
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-toearth ground would see
• Adjustable limits - for quicker testing
The Fluke 1625 earth ground tester are able to measure earth ground loop resistances 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.
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 tester, test leads, 4 earth ground stakes, 3 cable reels with wire, 2 clamps, batteries, and manual—all inside a rugged Fluke carrying case.
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 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 1625 tester, test leads, 4 earth ground stakes, 3 cable reels with wire, 2 clamps, batteries, and manual—all inside a rugged Fluke carrying case.
Description Microprocessor controlled, fully automated earth measuring instrument with additional functions
Measuring function Interference voltage and frequency, earthing resistance 3- and 4-pole with/without clip-on current transformer,
resistance 2-pole with ac, 2- and 4-pole with dc
Display 4 digit (2999 Digit) - 7 segment liquid crystal display, digit size 18 mm (0.71 in) with supplementary signs and
active illumination
Operation Central rotary switch and function keys
Temperature ranges
Working temperature range -10 °C to 50 °C (14° F to 122° F)
Operating temperature range 0 °C to 35 °C (32° F to 95° F)
Normal temperature range 18 °C to 28 °C (64° F to 82° F)
Storage temperature range -30 °C to 60 °C (-22° F to 140° F)
Temperature Coefficient +/- 0.1 % of range/Kelvin
Operating errors Refer to operating temperature range RX<20RE , RS < 100RE
; "Fluke 1625: Advanced GEO Earth Ground Tester")
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