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Fluke 1625-2 GEO Earth Ground Tester

The Fluke 1625-2 Earth Ground Tester offers fast, accurate earth ground tests using all 4 test methods. World class accessories speed set up and test time.

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Fluke 1625-2 GEO Earth Ground Tester
  • Fluke 1625-2 GEO Earth Ground Tester
  • Split-ring transformer for earth ground tester makes easy work of testing buried pylons
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  • The Fluke 1625-2 GEO Earth Ground Tester offers data storage and download capabilities via USB port. World class accessories will simplify and speed up testing time.

    • 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
    • USB data storage and transfer
    • 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-to earth ground would see
    • Adjustable limits - for quicker testing
  • Stakeless Testing

    The Fluke 1625-2 earth ground tester is 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.

    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 Most Complete Tester

    The Fluke 1625-2 is a unique earth ground tester that can performs 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)
  • General Specifications
    Memory Internal memory storage up to 1500 records accessible via USB port
    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, with improved visibility
    Operation Central rotary switch and function keys
    Temperature Range
    Operating temperature -10°C to 50°C (14°F to 122°F)
    Storage temperature -30°C to 60°C (-22°F to 140°F)
    Temperature coefficient ±0.1% of reading/°C < 18°C > 28°C
    Type of protection IP56 for case, IP40 for battery door according to EN60529
    Max voltage Warning – socket "clamp" to socket E, ES, S or H
    Urms = 0 V
    Sockets E, ES, S or H to each other in any combination, max. Urms = 250 V (pertains to misuse)
    Safety Protection by double and/or reinforced insulation. Max. 50 V to earth per IEC61010-1. 300 V CAT II, Pollution degree 2
    Quality standard Developed, designed and manufactured to comply with DIN ISO 9001
    External field influence Complies with DIN 43780 (8/76)
    Auxiliary power 6 x 1.5 V alkaline (IEC LR6 or type AA)
    Battery life span With IEC LR6/type AA: typ. 3,000 measurements (RE+RH ≤ 1 kΩ)
    With IEC LR6/type AA: typ. 6,000 measurements (RE + RH > 10 kΩ)
    Dimensions (W x H x D) 250 x 133 x 187 mm (9.75 x 5.25 x 7.35 in)
    Weight ≤ 1.1 kg (2.43 lb) without accessories 7.6 kg (16.8 lb) incl. accessories and batteries in carrying case
    Case material Polyester
    Measurement of Interference Voltage DC + AC (UST)
    Measuring limits of error: method Full wave rectification
    Measuring range 1 V to 50 V
    Display range 0.0 V to 50 V
    Resolution 0.1 V
    Frequency range DC/AC 45 Hz to 400 Hz sine
    Accuracy ±(5% of rdg + 5 digit)
    Measuring sequence Approx. 4 measurements/s
    Internal resistance Approx. 1.5 MΩ
    Max. overload Urms = 250 V
    Measurement of Interference Frequency (F)
    Measuring limits of error: method Measurement of oscillation period of the interference voltage
    Measuring range 6.0 Hz to 400 Hz
    Display range 16.0 Hz to 299.9 Hz to 999 Hz
    Resolution 0.1 Hz to 1 Hz
    Range 1 V to 50 V
    Accuracy ±(1% of rdg + 2 digit)
    Earthing Resistance (RE)
    Measuring method Current and voltage measurement with probe as IEC61557-5
    Open circuit voltage 20/48 V, AC
    Short circuit current 250 mA AC
    Measuring frequency 94, 105, 111, 128 Hz selected manually or automatic. (AFC) 55 Hz in function R1
    Noise rejection 120 dB (16 2/3 , 50 , 60, 400 Hz)
    Max. overload Urms = 250 V
    Electrical Measurement Specifications
    Intrinsic Error or Influence Quantity Reference Conditions or Specified Operating Range Designation Code Requirements or Test in Accordance with the Relevant Parts of IEC 1557 Type of Test
    Intrinsic error Reference conditions A Part 5, 6.1 R
    Position Reference position ±90° E1 Part 1, 4.2 R
    Supply voltage At the limits stated by the manufacturer E2 Part 1, 4.2, 4.3 R
    Temperature 0°C and 35°C E3 Part 1, 4.2 T
    Series interference voltage See 4.2 and 4.3 E4 Part 5, 4.2, 4.3 T
    Resistance of the probes and auxiliary earth electrodes 0 to 100 x RA but ≤ 50 kΩ E5 Part 5, 4.3 T
    System frequency 99% to 101% of the nominal frequency E7 Part 5, 4.3 T
    System voltage 85% to 110% of the nominal voltage E8 Part 5, 4.3 T
    Operating error B = ±(|A| + 1,15 √E21 E22 E23 E24 E25 E26 ) Part 5, 4.3 R
    B[%] = ± B/fiducial value x 100%

    A = intrinsic error
    En = variations
    R = routine test
    T = type test
    Measuring range 0.020 Ω to 300 kΩ
    Display range 0.001 Ω to 2.999 Ω
    3.00 Ω to 29.99 Ω
    30.0 Ω to 299.9 Ω
    0.300 kΩ to 2.999 kΩ
    3.00 kΩ to 29.99 kΩ
    30.0 kΩ to 299.9 kΩ
    Resolution 0.001 Ω
    0.01 Ω
    0.1 Ω
    1 Ω
    10 Ω
    100 Ω
    Accuracy ±(2% of rdg + 2 digit)
    Operating error ±(5% of rdg + 5 digit)
    Measuring time Typical 8 seconds with a fixed frequency 30 sec. max. with AFC and complete cycle of all measuring frequencies
    Additional error because of probe-and auxiliary earth electrode resistance RH(RS + 2000 Ω)/RE x 1.25 x 10-6% + 5 digits
    Measuring error of RH and RS Typ. 10% of RE + RS + RH
    Max. probe resistance ≤ 1 MΩ
    Max. auxiliary earth electrode resistance ≤ 1 MΩ

    Automatic check if error is kept within the limits required by IEC61557-5.
    If after a measurement of probe-, auxiliary earth electrode- and earthing resistance, a measurement error of higher than 30% is assumed because of the influencing conditions, the display shows a warning symbol and a notice that RS or RH are too high.

    Automatic Switchover of Measuring Resolution in Dependence to Auxiliary Earth Electrode Resistance RH
    RH with Umeas = 48 V < 300 Ω
    < 6 Ω
    < 60 Ω
    < 600 Ω
    RH with Umeas = 20 V < 250 Ω
    < 2.5 kΩ
    < 25 kΩ
    < 250 kΩ
    Resolution 1 mΩ
    10 mΩ
    100 mΩ
    1 Ω
    Selective Measurement of the Earthing Resistance (RE Clamp)
    Measuring method Current and voltage measurement with probe as per EN61557-5 and current measurement in the individual branch with additional current transformer (patent applied for).
    Open circuit voltage 20/48 V AC
    Short circuit current 250 mA AC
    Measuring frequency 94, 105, 111, 128 Hz selected manually or automatically (AFC), 55 Hz (R1)
    Noise rejection 120 dB (162/3, 50, 60, 400 Hz)
    Max. overload Max. Urms = 250 V (measurement will not be started)
    Measuring range 0.020 Ω to 300 kΩ
    Display range 0.001 Ω to 2.999 Ω
    3.00 Ω to 29.99 Ω
    30.0 Ω to 299.9 Ω
    0.300 kΩ to 2.999 kΩ
    3.00 kΩ to 29.99 kΩ
    Resolution 0.001 Ω
    0.01 Ω
    0.1 Ω
    1 Ω
    10 Ω
    Accuracy ±(7% of rdg + 2 digit)
    Operating error ±(10% of rdg + 5 digit)
    Additional error because of probe- and auxiliary earth typ. electrode resistance RH(RS + 2000 Ω)/RETOTAL x 1.25 x 10-6% + 5 digits
    Measuring error of RH and RS Typ. of 10% of RETOTAL + RS + RH
    Measuring time Typ. 8 sec. with a fixed frequency 30 sec. max. with AFC and complete cycle of all measuring frequencies.
    Minimal current in single branch to be measured 0.5 mA With transformer (1000:1)
    0.1 mA With transformer (200:1)
    Max. interference current through transformer 3 A With transformer (1000:1)
    1. With recommended current clamps/transformers.
    Resistance Measurement (R~)
    Measuring method Current and voltage measurement
    Measuring voltage 20 V AC, square pulse
    Short circuit current > 250 mA AC
    Measuring frequency 94, 105, 111, 128 Hz selected manually or automatically (AFC)
    Measuring range 0.020 Ω to 300 kΩ
    Display range 0.001 Ω to 2.999 Ω
    3.00 Ω to 29.99 Ω
    30.0 Ω to 299.9 Ω
    300 Ω to 2999 Ω
    3.00 kΩ to 29.99 kΩ
    30.0 kΩ to 299.9 kΩ
    Resolution 0.001 Ω
    0.01 Ω
    0.1 Ω
    1 Ω
    10 Ω
    100 Ω
    Accuracy ±(2% of rdg + 2 digit)
    Operating error ±(5% of rdg + 5 digit)
    Measuring time Typical 6 seconds
    Max. interference voltage 24 V, with higher voltages measurement will not be started
    Max overload Urms max. = 250 V
    Resistance Measurement (R DC)
    Measuring method Current- voltage measurement as per IEC61557-4 possible
    Measuring voltage 20 V DC
    Short circuit current 250 mA DC
    Formation of measured value With 4-pole measurement wires on H, S, ES can be extended without additional error.
    Resistances > 1 Ω in wire E can cause additional error of 5m Ω/Ω.
    Measuring range 0.020 Ω to 300 kΩ
    Display range 0.001 Ω to 2.999 Ω
    3.00 Ω to 29.99 Ω
    30.0 Ω to 299.9 Ω
    300 Ω to 2999 Ω
    3.0 kΩ to 29.99 kΩ
    30.0 kΩ to 299.9 kΩ
    Resolution 0.001 Ω
    0.01 Ω
    0.1 Ω
    1 Ω
    10 Ω
    100 Ω
    Accuracy ±(2% of rdg + 2 digit)
    Operating error ±(5% of rdg + 5 digit)
    Measuring sequence Approx. 2 measurements/s
    Measuring time Typical 4 second including reversal of polarity (2-pole or 4-pole)
    Maximum interference voltage ≤ 3 V AC or DC, with higher voltages measurement will not be started
    Maximum inductivity 2 Henry
    Maximum overload Urms = 250 V
    Compensation of Lead Resistance (RK)
    Compensation of lead resistance (RK) can be switched on in functions RE 3-pole, RE 4-pole (clamp), R AC, and R DC 2-pole
    Formation of measured value Rdisplay = Rmeasured - Rcompensated2
    2. Value of setpoint entry RK = 0.000 Ω, variable from 0.000 to 29.99 Ω by means of measuring adjustment.
    Stakeless Ground Loop Measurement (Two Clamp Stakeless)
    Switch position RA 4-pole (two clamp Stakeless)
    Resolution 0.001 Ω to 0.1 Ω
    Measuring range 0.02 Ω to 199.9 Ω
    Accuracy ±(7% rdg + 3 digit)
    Operating error ±(10% rdg + 5 digit)
    Measuring voltage Vm = 48 V AC (primary)
    Measuring frequency 128 Hz
    Noise current (IEXT) Max. IEXT = 10 A (AC) (RA < 20 Ω)
    Max. IEXT = 2 A (AC) (RA > 20 Ω)
    Measuring principle: Stakeless measurement of resistance in closed loops using two current transformers.
    Automatic range selection.
    The information regarding stakeless ground loop measurements is only valid when used in conjunction with the recommended current clamps at the minimum distance specified.
    • Models
      Model Name Description  
      Fluke 1625-2 Fluke 1625-2 GEO Earth Ground Tester
       

      Includes:

      • GEO Earth Ground Tester
      • User's Manual
      • Batteries
      • Quick Reference Guide
      • USB Cable
    • Accessory Kits
      Model Name Description  
      Fluke ES 162P3-2 Fluke ES-162P3-2 3-Pole Stake Kit
      Fluke ES-162P4-2 Fluke ES-162P4-2 4-Pole Stake Kit
    • Cables & Hardware
      Model Name Description  
      Fluke Cable Reel 25M BL Fluke Cable Reel 25M BL
      Fluke Cable Reel 25M GR Fluke Cable Reel 25M GR
      Fluke Cable Reel 50M RD Fluke Cable Reel 50M RD
    • Current Clamps
      Model Name Description  
      Fluke EI-1623 Fluke EI-1623 Selective/Stakeless Clamp Set
      Fluke EI-162AC Fluke EI-162AC Clip-on Current Transformer (Inducing)
      Fluke EI 162BN Fluke EI-162BN 320 mm Diameter Split Core Transformer Fluke Store
      Fluke EI-162X Fluke EI-162X Clip-on Current Transformer (Sensing) with Shielded Cable Set
    • Other Accessories
      Model Name Description  
      Fluke GEO Fluke GEO Ground/Earth Stake 2
    • Related Products
      Model Name Description  
      Fluke 1625-2 Kit Fluke 1625-2 GEO Earth Ground Tester Kit
      Fluke 1623-2 Kit Fluke 1623-2 GEO Earth Ground Tester Kit
      Fluke 1623-2 Fluke 1623-2 GEO Earth Ground Tester
    • Manuals
      Title  
      1623-2 Users Manual Download
      1623-2 Uživatelská příručka Download
      1623-2 Users Manual Download
      1623-2 Users Manual Download
      1623-2 Users Manual Download
      1623-2 Users Manual Download
      1623-2 Users Manual Download
      1623-2 Users Manual Download
      1623-2 Users Manual Download
      1623-2 Users Manual Download
      1623-2 Users Manual Download
      1623-2 Users Manual Supplement Download
      1625-2 Users Manual Download
      1625-2 Users Manual Download
      1625-2 Users Manual Download
      1625-2 Users Manual Download
      1625-2 Users Manual Download
      1625-2 Users Manual Download
      1625-2 Users Manual Download
      1625-2 Users Manual Download
      1625-2 Users Manual Download
      1625-2 Users Manual Download
      1625-2 Users Manual Download
      1625-2 Users Manual Supplement Download
      1623-2/1625-2 Quick Reference Guide Download
      1623-2/1625-2 Safety Sheet Download
      1623-2/1625-2 Safety Sheet Download
      1623-2/1625-2 Safety Sheet Download
      1623-2/1625-2 Safety Sheet Download
      1623-2/1625-2 Safety Sheet Download
      1623-2/1625-2 Safety Sheet Download
      1623-2/1625-2 Safety Sheet Download
      1623-2/1625-2 Safety Sheet Download
      1623-2/1625-2 Safety Sheet Download
      1623-2/1625-2 Safety Sheet Download
      1623-2/1625-2 Safety Sheet Download
      1623-2/1625-2 Statement of Memory Volatility Download
    • Application Notes
      Title  
      Checking ground electrode impedance for commercial, industrial and residential buildings Download
      Earth ground testing for mine sites with Fluke 1625 Download
      Principles of earth grounding Download
      Taking care of an at-risk dam Download
    • Brochures
      Title  
      Oil and Gas Downstream Brochure Download
      Oil and Gas Midstream Brochure Download
    • Data Sheets
      Title  
      Fluke 1623-2 and 1625-2 Technical Data Sheet Download
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