Fluke 1625-2 GEO Earth Ground Tester With (AFC) | Fluke
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Fluke 1625-2 GEO Earth Ground Tester

Fluke 1625-2 GEO Earth Ground Tester is rated 5.0 out of 5 by 1.
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  • Fluke 1625-2 GEO Earth Ground Tester
  • Fluke 1625-2 GEO Earth Ground Tester
  • Fluke 1625-2 GEO Earth Ground Tester

Key features

  • A unique earth ground tester that performs testing with and without stakes
  • Tests 3- and 4-pole fall-of-potential, and 4-pole soil resistivity (with stakes)
  • Performs selective earth ground rod testing (one clamp + stakes)
  • Performs stakeless earth ground rod testing (two clamps)
  • Features Automatic Frequency Control (AFC) to minimize the effect of interference
Speak with a specialist

Product overview: Fluke 1625-2 GEO Earth Ground Tester

Get fast, accurate earth ground testing using all four test methods

The Fluke 1625-2 earth ground tester measures earth ground loop resistances using only clamps, only stakes, or one clamp and stakes. With the stakeless test method, the Fluke 1625-2 is able to measure earth ground loop resistances for multi-grounded systems using only current clamps. This technique eliminates the dangerous, and time consuming job of disconnecting parallel grounds, and finding suitable locations for auxiliary ground stakes. This allows you to perform earth ground tests in places you’ve not considered before, such as inside buildings, on power pylons, or anywhere you don’t have access to soil.

Keep your options open

If a bonded earth ground system does not exist for the building or structure under test, and there is only one path to ground, you can use the 1625-2 to perform the fall-of-potential test method with stakes.

The 1625-2 Earth Ground Tester offers other advanced features including:

  • Automatic Frequency Control to identify existing interference and choose a measurement frequency to minimize its effect, thus providing a more accurate earth ground value.
  • R* measurement that calculates earth ground impedance at 55 Hz to more accurately reflect the earth ground resistance that a fault-to earth ground would see.

The 1625-2 is also very easy to use. World class accessories speed set up and test time. And the tester tells you which stakes or clamps to connect for each test. The large rotary switch and buttons are easy to operate even with a gloved hand. And you can store up to 1500 records and access them easily via the USB port.

Other useful capabilities:

  • Provides R* measurement that calculates earth ground impedance at 55 Hz to more accurately reflect the earth ground resistance that a fault-to earth ground would see
  • Includes USB port for data storage and transfer
  • Features IP56 rating for outdoor use
  • Offers adjustable limits for quicker testing
  • Comes with a rugged carrying case

Useful resources and rugged tools for Solar professionals

What's in the box:

  • GEO Earth Ground Tester
  • User's Manual
  • Batteries
  • Quick Reference Guide
  • USB Cable

Specifications: Fluke 1625-2 GEO Earth Ground Tester

General Specifications
MemoryInternal memory storage up to 1500 records accessible via USB port
Measuring functionInterference 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
Display4 digit (2999 Digit) - 7 segment liquid crystal display, with improved visibility
OperationCentral 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 protectionIP56 for case, IP40 for battery door according to EN60529
Max voltageWarning – 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)
SafetyProtection by double and/or reinforced insulation. Max. 50 V to earth per IEC61010-1. Pollution degree 2
Quality standardDeveloped, designed and manufactured to comply with DIN ISO 9001
External field influenceComplies with DIN 43780 (8/76)
Auxiliary power6 x 1.5 V alkaline (IEC LR6 or type AA)
Battery life spanWith 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 materialPolyester
Measurement of Interference Voltage DC + AC (UST)
Measuring limits of error: methodFull wave rectification
Measuring range1 V to 50 V
Display range0.0 V to 50 V
Resolution0.1 V
Frequency rangeDC/AC 45 Hz to 400 Hz sine
Accuracy±(5% of rdg + 5 digit)
Measuring sequenceApprox. 4 measurements/s
Internal resistanceApprox. 1.5 MΩ
Max. overloadUrms = 250 V
Measurement of Interference Frequency (F)
Measuring limits of error: methodMeasurement of oscillation period of the interference voltage
Measuring range6.0 Hz to 400 Hz
Display range16.0 Hz to 299.9 Hz to 999 Hz
Resolution0.1 Hz to 1 Hz
Range1 V to 50 V
Accuracy±(1% of rdg + 2 digit)
Earthing Resistance (RE)
Measuring methodCurrent and voltage measurement with probe as IEC61557-5
Open circuit voltage20/48 V, AC
Short circuit current250 mA AC
Measuring frequency94, 105, 111, 128 Hz selected manually or automatic. (AFC) 55 Hz in function R1
Noise rejection120 dB (16 2/3 , 50 , 60, 400 Hz)
Max. overloadUrms = 250 V
Electrical Measurement Specifications
Intrinsic Error or Influence QuantityReference Conditions or Specified Operating RangeDesignation CodeRequirements or Test in Accordance with the Relevant Parts of IEC 1557Type of Test
Intrinsic errorReference conditionsAPart 5, 6.1R
PositionReference position ±90°E1Part 1, 4.2R
Supply voltageAt the limits stated by the manufacturerE2Part 1, 4.2, 4.3R
Temperature0°C and 35°CE3Part 1, 4.2T
Series interference voltageSee 4.2 and 4.3E4Part 5, 4.2, 4.3T
Resistance of the probes and auxiliary earth electrodes0 to 100 x RA but ≤ 50 kΩE5Part 5, 4.3T
System frequency99% to 101% of the nominal frequencyE7Part 5, 4.3T
System voltage85% to 110% of the nominal voltageE8Part 5, 4.3T
Operating errorB = ±(|A| + 1,15 √E21 E22 E23 E24 E25 E26 )Part 5, 4.3R
B[%] = ± B/fiducial value x 100%

A = intrinsic error
En = variations
R = routine test
T = type test
Measuring range0.020 Ω to 300 kΩ
Display range0.001 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
Resolution0.001 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 timeTypical 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 resistanceRH(RS + 2000 Ω)/RE x 1.25 x 10-6% + 5 digits
Measuring error of RH and RSTyp. 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
Resolution1 mΩ
10 mΩ
100 mΩ
1 Ω
Selective Measurement of the Earthing Resistance (RE Clamp)
Measuring methodCurrent 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 voltage20/48 V AC
Short circuit current250 mA AC
Measuring frequency94, 105, 111, 128 Hz selected manually or automatically (AFC), 55 Hz (R1)
Noise rejection120 dB (162/3, 50, 60, 400 Hz)
Max. overloadMax. Urms = 250 V (measurement will not be started)
Measuring range0.020 Ω to 300 kΩ
Display range0.001 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
Resolution0.001 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 resistanceRH(RS + 2000 Ω)/RETOTAL x 1.25 x 10-6% + 5 digits
Measuring error of RH and RSTyp. of 10% of RETOTAL + RS + RH
Measuring timeTyp. 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 measured0.5 mAWith transformer (1000:1)
0.1 mAWith transformer (200:1)
Max. interference current through transformer3 AWith transformer (1000:1)
1. With recommended current clamps/transformers.
Resistance Measurement (R~)
Measuring methodCurrent and voltage measurement
Measuring voltage20 V AC, square pulse
Short circuit current> 250 mA AC
Measuring frequency94, 105, 111, 128 Hz selected manually or automatically (AFC)
Measuring range0.020 Ω to 300 kΩ
Display range0.001 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
Resolution0.001 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 timeTypical 6 seconds
Max. interference voltage24 V, with higher voltages measurement will not be started
Max overloadUrms max. = 250 V
Resistance Measurement (R DC)
Measuring methodCurrent- voltage measurement as per IEC61557-4 possible
Measuring voltage20 V DC
Short circuit current250 mA DC
Formation of measured valueWith 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 range0.020 Ω to 300 kΩ
Display range0.001 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
Resolution0.001 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 sequenceApprox. 2 measurements/s
Measuring timeTypical 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 inductivity2 Henry
Maximum overloadUrms = 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 valueRdisplay = 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 positionRA 4-pole (two clamp Stakeless)
Resolution0.001 Ω to 0.1 Ω
Measuring range0.02 Ω to 199.9 Ω
Accuracy±(7% rdg + 3 digit)
Operating error±(10% rdg + 5 digit)
Measuring voltageVm = 48 V AC (primary)
Measuring frequency128 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: Fluke 1625-2 GEO Earth Ground Tester

Fluke 1625-2
Fluke 1625-2 GEO Earth Ground Tester

Includes:

  • GEO Earth Ground Tester
  • User's Manual
  • Batteries
  • Quick Reference Guide
  • USB Cable
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Rated 5 out of 5 by from Great tool. We use this device to test every grounding system connected to equipment on which we perform work. We document the condition of grounding systems when we install backup and standby generators. At times, the results of a test mitigate an inspectors requirement for an auxiliary grounding electrode. All of this is great for us as a contractor, and provides good service to our customers. We maintain and use a Fluke 1625-2, in both traditional 3- and 4-pole staked tests, as well as stateless tests.
Date published: 2023-07-07
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