Fluke 1625 Advanced GEO Earth Ground Tester

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FE 1625
Datasheet  |  Manual

Price: $2,799.95

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The Fluke 1625 is intended for electrical utility or other high frequency environments as it has extra versatility for more demanding applications.

The Fluke 1625 is a distinctive earth ground tester that can perform all four types of earth ground measurement. Not only measure ground resistance using the classic 'fall of potential test' but also enable time saving testing using the 'selective' and 'stakeless' methods.  'Selective' testing does not require the electrode under test to be disconnected during the measurement, thus increasing safety.  The simple 'stakeless' method quickly checks ground connections using two current transformers (probes) clamped around the ground conductor under test.

Testing Methods

  • 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.

Earth ground resistance and soil resistivity should be measured when:

  • Designing earth ground systems
  • Installing new ground system and electrical equipment
  • Periodically testing ground and lightning protection systems
  • Installing large electrical equipment such as transformers, switchgears, machines, etc.

The Fluke 1625 Kit has everything you need to get started.
For a basic model see the Fluke 1623

What's Included:

  • Fluke 1625 tester
  • 2 test leads
  • 2 alligator clips
  • Batteries
  • Users manual
The Good:


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Full Review

  • 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
RA 3-pole ground resistance measurement (IEC 1557-5)
Measuring Voltage

Vm = 20/48 V ac
Short circuit current

250 mA ac
Measure frequency

94, 105, 111, 128Hz
Resolution

0.001 Ω to 100 Ω
Measuring range

0.001 Ω to 299.9 kΩ
Intrinsic error

(2 % of reading + 2 d)
Operating error

(5 % of reading + 5 d)

RA 4-pole ground resistance measurement (IEC 1557-5)
Measuring Voltage
Vm = 20/48 V ac
Short circuit current
250 mA ac
Measure frequency
94, 105, 111, 128Hz
Resolution
0.001 Ω to 100 Ω
Measuring range
0.001 Ω to 299.9 kΩ
Intrinsic error
(2 % of reading + 2 d)
Operating error
(5 % of reading + 5 d)

RA 3-pole ground resistance measurement with current clamp
Measuring Voltage
Vm = 20/48 V ac
Short circuit current
250 mA ac
Measure frequency
94, 105, 111, 128Hz
Resolution
0.001 Ω to 10 Ω
Measuring range
0.001 Ω to 29.99 kΩ
Intrinsic error
(7 % of reading + 2 d)
Operating error
(10 % of reading + 5 d)

RA 4-pole selective ground resistance measurement with current clamp
Measuring Voltage
Vm = 20/48 V ac
Short circuit current
250 mA ac
Measure frequency
94, 105, 111, 128Hz
Resolution
0.001 Ω to 10 Ω
Measuring range
0.001 Ω to 29.99 kΩ
Intrinsic error
(7 % of reading + 2 d)
Operating error
(10 % of reading + 5 d)

Stakeless ground loop measurement
Measuring Voltage
Vm = 20/48 V ac
Measure frequency
94, 105, 111, 128Hz
Noise current (Iext)
Max. Iext = 3 A
Resolution
0.001 Ω to 10 Ω
Measuring range
0.001 Ω to 29.99 kΩ
Intrinsic error
(7 % of reading + 2 d)
Operating error
(10 % of reading + 5 d)

Environmental Specifications
Working temperature

-10 C to +50 C
Operating Temperature

0 C to +35 C
Nominal temperature

+18 C to +28 C
Storage Temperature
-30 C to +60 C
Climatic class

C1 (IEC 654-1), -5 C to + 45 C, 5 % to 95 % RH
Protection Class

IP56 for case, IP40 for battery door according to EN 60529

Safety Specifications
Safety Rating

CAT II, 300 V

Mechanical & General Specifications
Display
2999 Digit LCD 7 segment liquid crystal display with special symbols and backlight
Size

133 mm x 187 mm x 250 mm
Weight
1.1 kg (including batteries)
Warranty

Two years
Battery Life
Typical 3000 measurements (RE+RH ≤ 1 kΩ)
Typical 6000 measurements (RE+RH ≤ 10 kΩ)

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