Fluke 1625-2 GEO Earth Ground Tester

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

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

Download the product manual Download the data sheet

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
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
	U_rms = 0 V
	Sockets E, ES, S or H to each other in any combination, max. U_rms = 250 V (pertains to misuse)
Safety	Protection by double and/or reinforced insulation. Max. 50 V to earth per IEC61010-1. 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 (R_E+R_H ≤ 1 kΩ)
	With IEC LR6/type AA: typ. 6,000 measurements (R_E + R_H > 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 (U_ST)
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	U_rms = 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	U_rms = 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 R_A 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 E_n = 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	R_H(R_S + 2000 Ω)/R_E x 1.25 x 10^-6% + 5 digits
Measuring error of R_H and R_S	Typ. 10% of R_E + R_S + R_H
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 R_H
RH with U_meas = 48 V	< 300 Ω
	< 6 Ω
	< 60 Ω
	< 600 Ω
RH with U_meas = 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 (R_E 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. U_rms = 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	R_H(R_S + 2000 Ω)/R_ETOTAL x 1.25 x 10^-6% + 5 digits
Measuring error of R_H and R_S	Typ. of 10% of R_ETOTAL + R_S + R_H
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	U_rms 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	U_rms = 250 V
Compensation of Lead Resistance (R_K)
Compensation of lead resistance (R_K) can be switched on in functions R_E 3-pole, R_E 4-pole (clamp), R AC, and R DC 2-pole
Formation of measured value	R_display = R_measured - R_compensated²
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: 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

Rated 5 out of 5 by SEaDInc 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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