Fluke 1625-2 Geo Earth Ground Tester

The Fluke 1625-2 Geo Earth Ground Tester is a cutting-edge solution for ensuring electrical safety in environments where electrical energy is generated, distributed, and consumed, protecting human life. In many cases, these safety measures are national and international regulations that must be checked regularly. Grounding, the connection of exposed conductive parts to the earth in case of a fault, represents the most fundamental safety measure. There are requirements for grounding transformers, high and medium-voltage power pylons, railway tracks, tanks, vats, foundations and lightning protection systems.

The effectiveness of grounding systems should be checked using ground-test instruments such as the Fluke 1625, which tests the ground connections. The 1625 provides the perfect solution by combining the latest technology into a compact, field-rugged and extremely easy-to-use instrument. In addition to performing standard 3- and 4-pole ground resistance measurements, an innovative process accurately measures individual earth electrode resistances in single and meshed earthed systems without disconnecting any parallel electrodes. One specific application of this capability is the quick, accurate measurement of power pylon grounds.

The 1625 also incorporates automatic frequency control (AFC) to minimise interference. Before measuring, the instrument identifies existing interference and selects a measurement frequency to minimise its effect. The 1625 incorporates microprocessor-controlled automatic measurements, including checking probe hookups to ensure measurements are taken correctly. It measures all probe ground resistances to provide reliable, repeatable results. Probe resistance and auxiliary earth resistance are also measured and displayed.

• Measurement of interference voltage (UST)
• Measurement of interference frequency (FST)
• Measurement of probe resistance (RS)
• Measurement of auxiliary earth electrode resistance (RH)
• Measurement of earthing resistance 3-pole, 4-pole, (RE) with or without using the external clip-on current transformer for selective measurement of single earthing branches in mesh-operated earthing systems A
• Resistance measurement 2-pole with AC voltage (R~) • Resistance measurement with DC voltage 2-pole, 4-pole, (RF)

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• 3- and 4-pole fall-of-potential and soil resistivity testing.
• Stakeless testing for earth ground loop resistances using clamps.
• Automatic Frequency Control (AFC) for interference-free measurements.
• R* measurement feature for precise fault-to-earth ground resistance.
• IP56-rated outdoor-ready design with a rugged carrying case.
• Integrated USB port for data storage and transfer of up to 1500 records.
• Adjustable limits for streamlined testing processes.

• Operation: Central rotary switch and function keys Working temperature range: -10 °C … +50 °C
• Operating temperature range: 0 °C … +35 °C
• Nominal temperature range: 18 °C … +28°C
• Storage temperature range: -30 °C … +60 °C
• Battery life: with IEC LR6/type AA: typ. 3000
• Measurements: (RE+RH ≤ 1 kΩ) with IEC LR6/type AA: typ. 6000
• Measurements: (RE + RH >10 kΩ) Dimensions: 240 mm (W) x 220 mm (D) x 90 mm ( H )
• Weight: ≤ 1.1 kg without accessories ≤ 5.5 kg incl. accessories and batteries in carrying case
• Case material: NORYL, shock -and scratch-proof thermoplastic.

Additional Accessories

The instrument is made up of two parts:

1. The base part, which contains the measuring electronics.
2. The protective housing. The functions are selected with the central rotary switch.

Four rubber buttons, which start measurements, read out supplementary measuring values and select special functions, are located on the left-hand side of the front panel. This design enables quick and precise one-hand operation. The measured values are displayed on a liquid crystal display with the correct decimal point and unit. Various additional special characters indicate measuring mode, operating condition and error messages. The auxiliary power supply comprises 6 x 1.5 V batteries (IEC R6 or LR6 or type AA). This device has been developed, designed and manufactured in compliance with the quality system DIN ISO 9001.

• Enhanced Safety: Ensures compliance with safety regulations by verifying grounding system effectiveness.
• Accurate Results: Advanced AFC technology minimises interference for precise measurements.
• Ease of Use: Compact, field-rugged design with one-hand operation for convenience.
• Versatility: Suitable for a wide range of applications, from industrial facilities to renewable energy installations.
• Reliable Performance: Microprocessor-controlled automatic measurements for consistent and repeatable results.

• Industrial facilities — Ideal for testing grounding in industrial environments, the Fluke 1625 ensures safety and compliance in areas with heavy machinery and electrical equipment. It verifies the effectiveness of grounding systems, crucial for protecting equipment and personnel from electrical faults, and meets rigorous safety standards in these settings.
• Construction sites — On sites where temporary electrical systems are standard, the Fluke 1625 is essential for testing ground integrity. It ensures that temporary power supplies, generators and construction equipment are safely grounded to reduce the risk of electrical hazards in these dynamic and often-changing environments.
• Utility companies — Utility companies can use the Fluke 1625 for maintaining and testing the grounding of electrical substations and distribution systems. This tester is vital for ensuring the safety and reliability of power grids, especially in troubleshooting and maintaining grounding systems in substations and along power lines.
• Telecommunication towers — For telecommunication towers, where reliable grounding is critical for operational integrity and safety, the Fluke 1625 is invaluable. It tests grounding systems to prevent electrical interference and protect against lightning strikes, ensuring the consistent performance and safety of these crucial communication infrastructures.
• Renewable energy installations — In renewable energy setups like solar farms and wind turbines, the Fluke 1625 tests and verifies the grounding systems. Proper grounding is vital for these installations to protect against electrical faults and lightning, ensuring the stability and safety of these increasingly essential energy sources.