AEMC 4620 (2130.43) 4-Point Ground Resistance Testers

The Digital Ground Resistance Tester Model 4620 performs ground resistance and soil resistivity tests. This direct reading testers measures from 0 to 2000Ω, and is auto-ranging, so it automatically seeks outs the optimum measurement range. The Model 4620 is rugged, easy-to-use and is ideal for maintenance crews performing numerous tests. It exceeds mechanical and safety specifications for shock, vibration and drop tests called out in IEC standards. It is designed to reject high levels of interference, so it can be used under difficult conditions such as high stray currents that normally affect accuracy.
The Model 4620 is also available in complete kit form. The 4620-Kit-150ft 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.
The 4620-Kit-300ft includes instrument, two 300 ft color-coded leads on spools (red and blue), two 100 ft color-coded leads (green and black), four 14.5" T-shaped auxiliary ground electrodes, one set of five spaded lugs, 100 ft tape measure and carrying bag.
The 4620-Kit-500ft includes instrument, two 500 ft color-coded leads on spools (red and blue), two 100 ft color-coded leads (green and black), one 30 ft lead (green), four 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

• Ranges : (Auto-Ranging 0 to 2000Ω) 20Ω
• Measurement : 0.00 to 19.99Ω
• Resolution : 10mΩ
• pen Voltage : ≤42V peak
• Resistance Measurement : 128Hz square wave
• Frequency
• Test Current : 10mA
• Accuracy : ±2% of Reading ± 1ct
• Auxiliary Electrode Influence
• Max Res. in Current Circuit : 3kΩ
• Max Res. in Voltage Circuit : 50kΩ
• Response Time : Approximately 4 to 8 seconds for a stabilized measurement
• Withstanding Voltage : 250Vac or 100Vdc
• Display : 31/2 digit, 0.71″ (18mm) high; 2000-counts; electroluminescent blue backlight

: LCD also indicates overrange,
: test lead shorts and lead reversals

• Connection : Color-coded terminals accept spade 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), 10 to 90% RH with batteries removed
• Dimensions : 10.8 x 9.7 x 5.0″ (273 x 247 x 127mm)
• Weight : 6.28 lbs (2.85kg) 7.38 lbs (3.35kg)
• Case : Heavy duty o-ring sealed field case
• Mechanical Shock : IEC 68-2-27
• Vibration Test : IEC 68-2-66
• 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)

: when case is closed

• AEMC 4620_4630 Datasheet.pdf