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AEMC 3640 2114.92 3-Point Digital Ground Resistance Tester Instruments
Product Information

3640 Datasheet 3640 Datasheet
  3640 Users Manual 3640 Users Manual
  Ground Resistance Calculator Ground Resistance Calculator
  Ground Resistance Testing Ground Resistance Testing
  Fall of Potential vs. Clamp On Fall of Potential vs. Clamp On
  Soil Resistivity Soil Resistivity
  Ground Comparison Chart Ground Comparison Chart

Your Price:
Choose Options and Quantity
NIST Calibration NIST Calibration [+$94.00]
Accessories 25 Ohm calibration checker [+$54.88]

AEMC 3640 2114.92 3-Point Digital Ground Resistance Tester

The AEMC 3640 3-Point Digital Ground Resistance Tester performs ground resistance measurement, measures from 10M to 1999 Ohms, and is auto ranging so it automatically finds the best measurement range.


The 3640 is so easy to use, just connect the leads, press to measure, and read. The large LCD is nearly 3/4 inch high and indicates lead reversals, over range, and low battery status. 3 LED indicators on the front panel warn the user continuously of measurement problems to assure reliable and accurate tests.


The 3640 is fuse protected up to 250 Volts AC.


3640 Features

  • Fall of Potential method
  • Measures 2 and 3-Point ground resistance
  • Auto ranging
  • Engineered to reject high levels of interference and noise
  • LED on faceplate alerts user of fault connections, high auxiliary rod resistance, and high input noise
  • Battery powered
  • Rugged rainproof and dustproof field case
  • Color coded terminals
  • Can be used for continuity tests on bonding



The 3640 is perfect for maintenance crews performing numerous tests, and is used in difficult conditions such as high stray currents that adversely affect accuracy. The 3640 can perform the following tests:

  • 3-point measurements for measuring resistance to ground of grids and ground rods.
  • 3-point measurements are usually used when the grid or electrode is easily disconnected, if corrosion is suspected, or where ground faults are unlikely to occur.
  • 2-point tests on pre-established grounds or for continuity on bonding. 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.

Measurement Range
Range 0.00 to 19.99 Watts / 20.00 to 199.9 Watts / 200.0 to 1999 Watts
Measurement Range 20 / 200 / 2000 Watts
Resolution 10mW / 100mW / 1W
Test Current 10 / 1 / 0.1 mA
Accuracy in % of Reading 2 percent Reading ±1 ct / 3 percent Reading ±3 cts
Accuracy Reference Conditions
23 degrees C ±3K, 50 percent RH ±10 percent, battery at 8 Volts ±0.2 Volt, external;
magnetic field <40 A/m, external field <1 V/m, conductor centered, loop resistance noninductive. Accuracy percent of reading
Resistance Measurement Frequency 128 Hertz square wave
Rejects high levels of interference voltage (DC, 50/60 Hertz, harmonics):
DC voltage in series with X:20 Volt 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
Power Source Eight 1.5 Volt AA batteries; Alkaline recommended; LO BAT indication on LCD
Battery Life 1800 15-second measurements
Fuse Protection High breaking capacity 0.1 Amp, 250 Volts, 0.25 x 1.25 inches
Mechanical Specifications
7-segment LCD, .71 inches (18 millimeters) high (3-1/2 digit); 2000 counts; LCD also indicates overrange,
test lead shorts and lead reversals
Connection Color-coded terminals accept lugs with minimum 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),0 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 8.7 x 5.4 x 5.9 inches (220 x 136 x 150 millimeters)
Weight 2.9 pounds (1.3 kg)
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
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 IEC 1010-1 Cat III Pollution Degree 2, 24 Volts
Agency Approvals Emission: EN 50081-1; Immunity: EN 50082-1
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