AEMC 4620 Battery Powered Ground Resistance Tester Kit, 4-Point, 500 f – Duncan Instruments Canada Ltd
AEMC 4620 Battery Powered Ground Resistance Tester Kit, 4-Point, 500 ft
AEMC 4620 Battery Powered Ground Resistance Tester Kit, 4-Point, 500 ft

AEMC 4620 Battery Powered Ground Resistance Tester Kit, 4-Point, 500 ft

Regular price $ 2,360.00 CAD $ 2,690.17 CAD Sale

Measures soil resistivity (4-Point). Measures ground resistance (2- and 3-Point) Fall-of-Potential method. This direct reading tester measures from 0 to 2000Ω, and is autoranging, so that it can automatically seek out the optimum measurement range. This kit includes a ground resistance tester with two 500ft color-coded leads on spools, two 100ft color-coded leads, two 5ft color-coded leads, four 14.5" T-shaped auxiliary ground electrodes, one set of five spaded lugs, 100ft tape measurer, and a carrying bag.

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 250V AC against accidental connection to live circuits. In the event of a system fault, it can withstand 250V AC with spikes of 3000V AC or 1000V DC.

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.


  • 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.
  • 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.

AEMC 4620 Specifications

Measurement Range
Range 20Ω
Measurement Range 0.00 to 19.99Ω
20.0 to 199.9Ω
200 to 1999Ω
Resolution 10mΩ
Test Current 10mA
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

What's included with the AEMC 4620 Kit-300ft

  • Digital Ground Resistance Tester
  • 2 x 500ft red and blue leads on spools
  • 2 x 100ft hand-tied green and black leads
  • 4 x T-shaped auxiliary ground electrodes
  • Set of 5 spaded lugs
  • 1 x 100ft AEMC tape measurer
  • Ground tester workbook on a USB stick
  • 8 x C cell batteries
  • Carrying bag
  • Manual