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AEMC 4620 Digital Ground Resistance Tester Kit - 300ft

Model: 4620 Kit-300ft

AEMC 4620 ground resistance tester with two 300 ft color-coded leads on spools, two 100 ft color-coded leads,two 5 ft color-coded leads, four 14.5" T-shaped auxiliary ground electrodes, one set of five spaded lugs, 100 ft tape measure and carrying bag

$1,499.00 USD

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The AEMC 4620 Digital Ground Resistance Tester performs ground resistance and soil resistivity tests. This direct reading tester measures from 0 to 2000Ω, and is autoranging, so that it can automatically seek out the optimum measurement range.

Easy-to-use simply connect the leads, Press-to-Measure and read the results. The large LCD (nearly 3/4" high characters) is easy-to-read, and also indicates low battery status, overrange and test lead shorts and lead reversals. Three LED indicators on the front panel continuously warn the user of measurement problems to ensure accurate and reliable tests.

The AEMC 4620 Digital Ground Resistance Tester is fuse protected up to 250VAC against accidental connection to live circuits. In the event of a system fault, it can withstand 250VAC with spikes of 3000VAC or 1000VDC.

The heavy-duty field case is sealed against dust and water when closed. The meter itself is self-contained within an inner case providing additional environmental and insulation protection. The test button is also sealed against the elements.

This tester is powered by eight, C cell batteries and will perform over 2000 - 15 second tests between battery replacement. The AEMC 4620 Ground Resistance Tester is a rugged, easy-to-use instrument ideal for maintenance crews performing numerous tests. The AEMC 4620 exceeds mechanical and safety specifications for shock, vibration and drop tests called out in IEC standards. Designed to reject high levels of interference, so it can be used under difficult conditions such as high stray currents that normally affect accuracy.


  • 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.
  • Two-Point tests for continuity tests on bonding or on pre-established grounds. This test is commonly performed in urban environments where proper auxiliary electrode placement may be obscured by confined real estate. Measurements are referenced against a good local ground conductor.

Key Features

  • 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


Measurement Range
Range 20Ω / 200Ω / 2000Ω
Measurement Range 0.00 to 19.99Ω / 20.0 to 199.9Ω / 200 to 1999Ω
Resolution 10mΩ / 100mΩ / 1Ω
Test Current 10mA / 1mA / 0.1mA
Accuracy ±2% of Reading ± 1ct / ±3% of Reading ± 3cts
Auxiliary Electrode Influence Current Circuit: 200Ω; Voltage Circuit: 2000Ω / Current Circuit: 30kΩ; Voltage Circuit: 50kΩ / Current Circuit: 50kΩ; Voltage Circuit: 50kΩ
Open Voltage <42V peak
Resistance Measurement Frequency 128Hz square wave
Interference Rejects high levels of interference voltage (DC, 50 to 60Hz, harmonics): DC voltage in series with X: 20V; AC voltage in series with Y: 13V peak; AC voltage in series with Z: 32V peak
Response Time Approximately 6 seconds for a stabilized measurement
Voltage Withstand 250VAC with spikes of 3000VAC or 1000VDC
Power Source Eight C cell batteries
Battery Life 1800 15-second measurements
Fuse Protection 0.1A, 250v, 0.25 X 1.25"; 30kA Interrupt Capacity
Mechanical Specifications
Display 3-1/2, 0.71" (18mm) high; 2000-count; electroluminescent blue backlight - LCD also indicates overrange, test lead shorts and lead reversals
Connection Color-coded terminals accept lugs with min. gap of 6mm or standard 4mm banana jacks
LED Indication Three LEDs indicate high input noise, high auxiliary rod resistance, open leads, blown fuse
Operating Temperature 14° to 131°F (-10° to 55°C), 20 to 90% RH
Storage Temperature -40° to 158° F (-40 to 70° C), 0 to 90% RH with batteries removed
Dimensions 9.45 x 7.28 x 4.33" (240 x 185 x 110mm)
Weight 7.75 lbs (3.5kg)
Case Heavy duty o-ring sealed field case
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
Dielectric Test 3kV, 50/60Hz, 1 min. between four interconnected measuring terminals and any external metal ground
Environmental O-ring sealed against dust and water to IP50 (Protection Index)
Safety Reference Specifications
Safety Ratings EN 61010-1, Cat. III, Pollution Degree 2, 42V
Agency Approvals CE Mark

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