Earth Tester Fluke 1625-2

fluke1625-2

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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.

  • 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
  • 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

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)
Detailed Specifications
General
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. 300V CAT II, 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 (WxHxD)250 mm x 133 mm x 187 mm (9.75 in x 5.25 in 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 R*
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 E25E2)Part 5, 4.3R
A = intrinsic error
En = variations
R = routine test
T = type test
B[%] = ± B/fiducial value x 100%
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 (R*)
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 RHand 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)
* 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 - Rcompensated*
* 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.