AEMC 3620 Kit Analog Ground Resistance Tester Kit for 3-Point Testing, 150 ft

Model: 3620 Kit-150ft | Order No: 2135.10

Fall-of-Potential method for 2- and 3-Point ground resistance tests. Direct reading on large analog display 0.5 to 1000Ω and easy 25Ω readings.

Sorry! This product has been discontinued.

The AEMC 3620 Ground Resistance Tester Kit - 150ft has been discontinued, it has been replaced by the AEMC 3640 Ground Resistance Tester Kit, 3-Point, 150 ft

Calibration Lab

AEMC 2135.19 4620KIT-150 4-Point Ground Resistance Tester Kit

The Model 4620 is also available in complete kit form, which includes instrument, two 150 ft color-coded leads on spools (red and blue), one 30 ft lead (green), two 14.5" T-shaped auxiliary ground electrodes, one set of five spaded lugs, 100 ft tape measure and carrying bag.


  • Measures soil resistivity (4-Point) method
  • Measures ground resistance (2- and 3-Point) Fall-of-Potential method
  • Step voltage tests and touch potential measurements
  • Auto-Ranging: automatically selects the optimum range
  • Designed to reject high levels of noise interference
  • Extremely simple to operate: connect - press - read
  • LED on faceplate informs operator of high input noise, high auxiliary rod resistance and fault connections
  • Battery powered
  • Rugged, dustproof and rainproof field case
  • Can also be used for continuity tests on bonding
  • Color-coded terminals


  • Three-Point measurements of resistance to ground of ground rods and grids.
  • Three-point measurements are generally used when the electrode or grid can be easily disconnected, if corrosion is suspected, or in circumstances where ground faults are unlikely to occur
  • Four-Point tests or soil resistivity measurements. Locating areas of lowest soil resistivity is essential for achieving an economical grounding installation
  • Touch potential measurements, an alternative to 3-Point tests in evaluating electrical safety. This test is recommended when the ground cannot be disconnected, where ground faults are highly likely to occur, or when the "footprint" of grounded equipment is comparable to the size of the ground to be tested.


Measurement Range
Range 0.5 to 1000Ω
Measurement Range 25Ω
Resolution 10mΩ
Test Current 10mA
Accuracy in % of Reading 5% + 0.1% of galvanometer scale length
Auxiliary Electrode Influence Rz: 3000 times the reading up to 50kΩ, Ry: 50kΩ
Accuracy Reference Conditions 23°C ±3K, 50% RH ±10%, battery at 8V ±0.2V, externa; magnetic field
Resistance Measurement Frequency 128Hz square wave
Voltage Withstand 250Vrms with spikes of 3000VAC or 1000VDC
Power Source Eight 1.5V "AA" Alkaline batteries
Battery Life 1680 fifteen-second tests (approximately)
Fuse Protection High breaking capacity 0.1A, 250V, 0.25" x 1.25"
Mechanical Specifications
Display Analog pivot movement
Connection Color-coded terminals accept spade lugs with minimum gap of 6 mm or standard 4mm banana jacks
Scale 3.1" (77mm) white scale with black pointer; one scale per range
Operating Temperature 14 to 131°F (-10 to 55°C)
Storage Temperature -40 to 158°F (-40 to 70°C), 0 to 90% RH with batteries removed
Temperature Influence 5% per 10° C
Relative Humidity 20 to 90% maximum
Dimensions 8.7 x 5.4 x 5.9" (220 x 136 x 150mm)
Weight 2 lb (1.3kg)
Case Heavy-duty, ABS
Colors Case: safety yellow; Front panel: gray
Mechanical Shock IEC 68-2-27
Vibration Test IEC 68-2-6
Drop Test IEC 68-2-32
Environmental O-ring sealed against dust and water to IP50
Safety Reference Specifications
Safety Ratings IEC 1010-1 Cat III Pollution Degree 2, 24V
Agency Approvals
Emission EN 50081-1;
Immunity EN 50082-1

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