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Fluke 1625-2 Earth Ground Tester
The Fluke 1625-2 is an advanced GEO earth ground tester capable of performing all four types of ground measurement: 3- and 4-Pole Fall-of-Potential, 4-Pole Soil Resistivity, Selective Testing, and Stakeless Loop Testing. Equipped with Automatic Frequency Control (AFC), interference voltage sensing, and internal USB memory for 1,500 records, it delivers lab-grade grounding verification in demanding high-noise industrial environments.
Key Features
The Fluke 1625-2 delivers comprehensive grounding verification through its advanced multi-function capability. Beyond standard earth resistance measurements, it simultaneously measures interference voltage and frequency, providing critical data about power quality issues that affect grounding performance. The large 4-digit LCD display ensures clear readings in various lighting conditions, while the IP56-rated case protects against dust and water ingress during field use. Internal memory stores up to 1500 readings, transferable via USB for reporting and analysis.
- Interference voltage measurement: 1 V to 50 V AC/DC
- Interference frequency range: 45 Hz to 400 Hz
- Earth resistance measurement: 3- and 4-pole methods with/without clip-on current transformer
- 2-pole resistance measurement with AC and DC
- Internal memory: 1500 records accessible via USB
- Operating temperature: -10°C to 50°C
- IP56 case rating for rugged field use
- Battery life: 3000+ measurements per battery set
Description
Fluke 1625-2 Applications
Industrial facilities use the Fluke 1625-2 to verify grounding systems for large motors, transformers, and switchgear, ensuring fault currents have a reliable path to earth during fault conditions. Commercial buildings rely on the instrument to test grounding of lightning protection systems, elevator equipment, and HVAC systems, protecting both occupants and sensitive electronics from surge damage. Telecommunications sites depend on accurate earth resistance measurements to maintain proper grounding for antenna systems and radio equipment, preventing interference and ensuring reliable operation. Utility companies utilize the Fluke 1625-2 for substation grounding verification and transmission line tower testing, where grounding system integrity is critical for public safety and grid stability.
Technical Specifications
| Specification Parameter | Value / Range |
| Brand / Manufacturer | Fluke Corporation |
| Model | Fluke 1625-2 (PN: 4325162, MME SKU: 6dbba340c3f6) |
| Measurement Functions | 3- & 4-Pole Fall-of-Potential, 4-Pole Soil Resistivity, Selective testing, Stakeless testing, 2-Pole AC/DC resistance |
| Earth Resistance Range ($R_E$) | 0.001 Ω to 299.9 kΩ (Auto-ranging) |
| Basic Accuracy | ±(5% of reading + 5 digits) |
| Test Voltages ($U_m$) | 20 V / 48 V AC (User selectable) |
| Short-Circuit Current | 250 mA AC |
| Measuring Frequencies | 94, 105, 111, 128 Hz (AFC or manual); 55 Hz in $R^*$ impedance mode |
| Noise Rejection | 120 dB (at 16⅔, 50, 60, 400 Hz) |
| Interference Voltage Measurement | 1.0 V to 50.0 V (DC + AC 45 Hz to 400 Hz sine) |
| Interference Frequency Range | 6.0 Hz to 400 Hz |
| Data Memory | Internal storage up to 1,500 records; USB interface |
| Display | 4-digit (2999 counts), 7-segment high-visibility LCD |
| Safety Ratings | Complies with IEC/EN 61010-1, CAT II 300 V; IEC 61557-5 |
| Ingress Protection | IP56 (case closed and operating), IP40 (battery door) according to EN 60529 |
| Power Supply | 6 × 1.5 V AA Alkaline batteries (IEC LR6) (Typ. 3,000 to 6,000 tests) |
| Dimensions & Weight | 250 × 133 × 187 mm (9.75 × 5.25 × 7.35 in); Tester approx. 1.1 kg |
| Standard Package Contents | Fluke 1625-2 Tester, USB Cable, 6× AA Alkaline Batteries, 2× Measuring Leads, Quick Reference Guide, User Manual |
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