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AEMC 4620 4-Point Ground Resistance Tester

The rugged 4620 measures from 0 to 2000 Ohms, is auto ranging so it automatically finds the best measurement range, and is easy to use which makes it ideal for maintenance crews performing numerous tests. It exceeds safety and mechanical specifications for drop tests, vibration, and shock as specified in the IEC standards. The 4620 is engineered to reject very high levels of interference, making it ideal for use under harsh conditions such as high stray currents that adversely affect accuracy.

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Feature Specification

Measures soil resistivity with the 4-Point testing method
Measures ground resistance with the 2-Point, 3-Point, and Fall of Potential method
Step voltage tests
Touch potential measurements
Auto Ranging
Designed to reject high levels of noise interference
Very easy to operate just connect, press, and read
LED in faceplate alerts the user of fault connections, high auxiliary rod resistance, and high input noise
Battery powered
Rugged rainproof and dustproof field case
Continuity tests on bonding
Color coded terminals

AEMC 4620 Applications

3-point measurements of resistance to ground of grids and ground rods. 3-Point measurements are usually utilized when the grid or electrode can easily be disconnected, if there is suspected corrosion, or circumstances where ground faults are unlikely to occur.
Soil resistivity measurements or 4-Point tests. Finding areas of lowest soil resistivity is necessary to achieve a feasible grounding installation solution.
4-point tests
Soil resistivity measurements.
Touch potential measurements (an alternative to 3-point tests in evaluating electrical safety). This test is preferred when the ground cannot be disconnected, where ground faults are very likely to occur, or when the ""footprint"" of grounded equipment is comparable to the size of the ground to be tested.

AEMC 4620 Specifications
Measurement Range
Range	20 / 200 / 2000 Watts
Measurement Range	0.00 to 19.99 Watts / 20.0 to 199.9 Watts / 200 to 1999 Watts
Resolution	10mW / 100mW / 1W
Test Current	10 / 1 / 0.1 mA
Accuracy	±2 percent of Reading ± 1ct / ±3 percent of Reading ± 3cts
Auxiliary Electrode Influence	Current Circuit: 200 Watts; Voltage Circuit: 2000 Watts / Current Circuit: 30 kW Voltage Circuit: 50 kW / Current Circuit: 50 kW; Voltage Circuit: 50 kW
Open Voltage	<42 Volts peak
Resistance Measurement Frequency	128 Hertz square wave
Interference	Rejects high levels of interference voltage (DC, 50 to 60 Hertz, harmonics): DC voltage in series with X: 20 Volts; AC voltage in series with Y: 13 Volts peak; AC voltage in series with Z: 32 Volts peak
Response Time	Approximately 6 seconds for a stabilized measurement
Voltage Withstand	250 Volts AC with spikes of 3000 Volts AC or 1000 Volts DC
Power Source	8 C cell batteries
Battery Life	1800 15 second measurements
Fuse Protection	0.1 Amp, 250 volts, 0.25 X 1.25 inch; 30 kA Interrupt Capacity
Mechanical Specifications
Display	3-1/2, 0.71 inch (18 millimeters) 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 6 millimeters or standard 4 millimeter banana jacks
LED Indication	3 LEDs indicate high input noise, high auxiliary rod resistance, open leads, blown fuse
Operating Temperature	14 to 131 degrees F (-10 to 55 degrees C), 20 to 90 percent RH
Storage Temperature	-40 to 158 degrees F (-40 to 70 degrees C), 0 to 90 percent RH with batteries removed
Dimensions	9.45 x 7.28 x 4.33 inches 240 x 185 x 110 millimeters
Weight	7.75 pounds (3.5 kg)
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	3 kV, 50/60 Hertz, 1 minute between four interconnected measuring terminals and any external metal ground
Environmental	O-ring sealed against dust and water to IP50
Safety Reference Specifications
Safety Ratings	EN 61010-1, Cat. III, Pollution Degree 2, 42 Volts
Agency Approvals	CE Mark