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The Fluke 1623 and 1625 are distinctive earth ground testers that can perform all four types of earth ground measurement. Specifically, the Fluke 1623 and 1625 testers are able to measure earth ground loop resistances using only clamps – called Stakeless testing. This method doesn’t require the use of earth ground stakes or the disconnection of ground rods.
Testing Methods
- 3- and 4-Pole Fall of Potential – standard earth ground testing using two 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.
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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.
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Fluke 1623
- One-button measurement concept
- 3- and 4-pole earth ground measurement
- 4-pole soil resistivity testing
- Selective testing, no disconnection of ground conductor (1 clamp)
- Stakeless testing, quick ground loop testing (2 clamps)
- Measuring frequency 128 Hz
Fluke 1625
- 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
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| RA 3-pole ground resistance measurement (IEC 1557-5) |
| Measuring Voltage |
| Fluke 1623 |
Vm = 48 V ac |
| Fluke 1625 |
Vm = 20/48 V ac |
| | Short circuit current |
| Fluke 1623 |
> 50 mA |
| Fluke 1625 |
250 mA ac |
| | Measure frequency |
| Fluke 1623 |
128 Hz |
| Fluke 1625 |
94, 105, 111, 128Hz |
| | Resolution |
| Fluke 1623 |
0.001 Ω to 10 Ω |
| Fluke 1625 |
0.001 Ω to 100 Ω |
| | Measuring range |
| Fluke 1623 |
0.001 Ω to 19.99 kΩ |
| Fluke 1625 |
0.001 Ω to 299.9 kΩ |
| | Intrinsic error |
| Fluke 1623 |
± (2 % of reading + 3 digit) |
| Fluke 1625 |
± (2 % of reading + 2 d) |
| | Operating error |
| Fluke 1623 |
± (5 % of reading + 3 d) |
| Fluke 1625 |
± (5 % of reading + 5 d) |
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| RA 4-pole ground resistance measurement (IEC 1557-5) |
| Measuring Voltage |
| Fluke 1623 |
Vm = 48 V ac |
| Fluke 1625 |
Vm = 20/48 V ac |
| | Short circuit current |
| Fluke 1623 |
> 50 mA |
| Fluke 1625 |
250 mA ac |
| | Measure frequency |
| Fluke 1623 |
128 Hz |
| Fluke 1625 |
94, 105, 111, 128Hz |
| | Resolution |
| Fluke 1623 |
0.001 Ω to 10 Ω |
| Fluke 1625 |
0.001 Ω to 100 Ω |
| | Measuring range |
| Fluke 1623 |
0.001 Ω to 19.99 kΩ |
| Fluke 1625 |
0.001 Ω to 299.9 kΩ |
| | Intrinsic error |
| Fluke 1623 |
± (2 % of reading + 3 d) |
| Fluke 1625 |
± (2 % of reading + 2 d) |
| | Operating error |
| Fluke 1623 |
± (5 % of reading + 3 d) |
| Fluke 1625 |
± (5 % of reading + 5 d) |
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| RA 3-pole ground resistance measurement with current clamp |
| Measuring Voltage |
| Fluke 1623 |
Vm = 48 V ac |
| Fluke 1625 |
Vm = 20/48 V ac |
| | Short circuit current |
| Fluke 1623 |
> 50 mA |
| Fluke 1625 |
250 mA ac |
| | Measure frequency |
| Fluke 1623 |
128 Hz |
| Fluke 1625 |
94, 105, 111, 128Hz |
| | Resolution |
| Fluke 1623 |
0.001 Ω to 10 Ω |
| Fluke 1625 |
0.001 Ω to 10 Ω |
| | Measuring range |
| Fluke 1623 |
0.001 Ω to 19.99 kΩ |
| Fluke 1625 |
0.001 Ω to 29.99 kΩ |
| | Intrinsic error |
| Fluke 1623 |
± (7 % of reading + 3 d) |
| Fluke 1625 |
± (7 % of reading + 2 d) |
| | Operating error |
| Fluke 1623 |
± (10 % of reading + 5 d) |
| Fluke 1625 |
± (10 % of reading + 5 d) |
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| RA 4-pole selective ground resistance measurement with current clamp |
| Measuring Voltage |
| Fluke 1623 |
Vm = 48 V ac |
| Fluke 1625 |
Vm = 20/48 V ac |
| | Short circuit current |
| Fluke 1623 |
> 50 mA |
| Fluke 1625 |
250 mA ac |
| | Measure frequency |
| Fluke 1623 |
128 Hz |
| Fluke 1625 |
94, 105, 111, 128Hz |
| | Resolution |
| Fluke 1623 |
0.001 Ω to 10 Ω |
| Fluke 1625 |
0.001 Ω to 10 Ω |
| | Measuring range |
| Fluke 1623 |
0.001 Ω to 19.99 kΩ |
| Fluke 1625 |
0.001 Ω to 29.99 kΩ |
| | Intrinsic error |
| Fluke 1623 |
± (7 % of reading + 3 d) |
| Fluke 1625 |
± (7 % of reading + 2 d) |
| | Operating error |
| Fluke 1623 |
± (10 % of reading + 5 d) |
| Fluke 1625 |
± (10 % of reading + 5 d) |
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| Stakeless ground loop measurement |
| Measuring Voltage |
| Fluke 1623 |
Vm = 48 V ac |
| Fluke 1625 |
Vm = 20/48 V ac |
| | Measure frequency |
| Fluke 1623 |
128 Hz (125 Hz on request) |
| Fluke 1625 |
94, 105, 111, 128Hz |
| | Noise current (Iext) |
| Fluke 1623 |
Max. Iext = 10 A (ac) (RA < 20 Ω) |
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Max. Iext = 2 A (ac) (RA < 20 Ω) |
| Fluke 1625 |
Max. Iext = 3 A |
| | Resolution |
| Fluke 1623 |
0.001 Ω to 0.1 Ω |
| Fluke 1625 |
0.001 Ω to 10 Ω |
| | Measuring range |
| Fluke 1623 |
0.001 Ω to 199.9 kΩ |
| Fluke 1625 |
0.001 Ω to 29.99 kΩ |
| | Intrinsic error |
| Fluke 1623 |
± (7 % of reading + 3 d) |
| Fluke 1625 |
± (7 % of reading + 2 d) |
| | Operating error |
| Fluke 1623 |
± (10 % of reading + 5 d) |
| Fluke 1625 |
± (10 % of reading + 5 d) |
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| Environmental Specifications |
| Working temperature | | | Operating Temperature | | | Nominal temperature | | | Storage Temperature |
| Fluke 1623 |
-20 °C to +60 °C |
| Fluke 1625 |
-30 °C to +60 °C |
| | Climatic class |
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C1 (IEC 654-1), -5 °C to + 45 °C, 5 % to 95 % RH |
| | Protection type |
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IP56 for case, IP40 for battery door according to EN 60529 |
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| Safety Specifications |
| Safety Rating | |
| Mechanical & General Specifications |
| Display |
| Fluke 1623 |
1999 digit LCD – display with special symbols, digit height 25 mm, fluorescent backlight |
| Fluke 1625 |
2999 Digit LCD – 7 segment liquid crystal display with special symbols and backlight |
| | Size | | | Weight |
| Fluke 1623 + 1625 |
1.1 kg (including batteries) |
| | Warranty | | | Battery Life |
| Fluke 1623 |
Typical > 3000 measurements |
| Fluke 1625 |
Typical 3000 measurements (RE+RH ≤ 1 kΩ) |
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Typical 6000 measurements (RE+RH ≤ 10 kΩ) |
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| Model Name | Description | Price List | Buy it | | Fluke 1623 |
Basic GEO Earth Ground Tester
- Fluke 1623 tester
- 2 test leads
- Batteries
- Users manual
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|  | | | Fluke 1623 Kit |
Kit, Basic Geo Earth Ground Tester
- Fluke 1623 tester
- 2 test leads
- 4 earth ground stakes
- 3 cable reels with wire (2-25 m, 1-50 m)
- 2 clamps (one inducing, one sensing)
- Batteries
- Users manual
- Rugged carrying case
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| | | | Fluke 1625 |
Advanced GEO Earth Ground Tester
- Fluke 1625 tester
- 2 test leads
- Batteries
- Users manual
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| | | | Fluke 1625 Kit |
Kit, Advanced Geo Earth Ground Tester
- Fluke 1625 tester
- 2 test leads
- 4 earth ground stakes
- 3 cable reels with wire (2-25 m, 1-50 m)
- 2 clamps (one inducing, one sensing)
- Batteries
- Users manual
- Rugged carrying case
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| CarePlans | Buy it | | G2P-Group2 |
- GOLD CarePlan.
- Models covered: 63, 566, 568, 975VP, 1621, 1623, and 1630.
- Extends warranty from two to four years and includes four annual NIST traceable calibrations with data.
| |  | | G2P-Group4 |
- GOLD CarePlan.
- Models covered: 975, 1625, and 1735.
- Extends warranty from two to four years and includes four annual NIST traceable calibrations with data.
| | | | S2P-Group2 |
- SILVER CarePlan.
- Models covered: 63, 566, 568, 975VP, 1621, 1623, and 1630.
- Extends warranty from two to four years.
| | | | S2P-Group4 |
- SILVER CarePlan.
- Models covered: 975, 1625, and 1735.
- Extends warranty from two to four years.
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| Accessory Kits | Buy it | | ES-162P3 | ES-162P3 3-Pole Stake Kit | | | | ES-162P4 | ES-162P4 4-Pole Stake Kit | | |
| Cables and Hardware | Buy it | | GEO CABLE-REEL 50M | Earth Ground Cable 50 M Wire | | | | GEO CABLE-REEL 25M | Earth Ground Cable Reel 25 M Wire | | |
| Current Clamps | Buy it | | EI-1623 | EI-1623 Selective/Stakeless Clamp Set for Fluke 1623 | | | | EI-1625 | EI-1625 Selective/Stakeless Clamp Set for Fluke 1625 | | | | EI-162BN | EI-162BN 320 mm Diameter Split Core Transformer | | |
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