Questions? Let us help:

Contact Us

AEMC 3640 Digital 3-Point Ground Resistance Tester

Model: 3640

Digital 2 and 3-point fall-of-potential ground resistance tester

$795.00 USD

1 to 2 Weeks

The AEMC 3640 Digital Ground Resistance Tester performs ground resistance measurement. This direct reading tester measures from 10MΩ to 1999Ω, and is auto-ranging, so it automatically seeks out the optimum measurement range. The 3640 is easy to use - simply connect the leads, press to measure, and read. The large LCD (nearly 3/4" high) also indicates low battery status, overrange, and lead reversals.

The 3640 comes with 3 color coded terminals to aid in easy hookup. Three LED indicators on the front panel continuously warn the user of measurement problems to ensure accurate and reliable tests.

The 3640 is fuse protected up to 250VAC.


  • Three-point measurements for measuring resistance to ground of ground rods and grids. Three-point measurements are generally used when the electrode or grid is easily disconnected, if corrosion is suspected, or where ground faults are unlikely to occur.
  • Two-point tests for continuity 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

  • Fall-of-Potential method
  • Measures ground resistance (2- and 3-Point)
  • Autoranging: automatically selects the optimum range
  • Designed to reject high levels of noise and 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
  • Color-coded terminals
  • May be used for continuity tests on bonding


Measurement Range
Range 0.00 to 19.99Ω / 20.00 to 199.9Ω / 200.0 to 1999Ω
Measurement Range 20Ω / 200Ω / 2000Ω
Resolution 10mΩ / 100mΩ / 1Ω
Test Current 10mA / 1mA / 0.1mA
Accuracy in % of Reading 2% Reading ±1 ct / 3% Reading ±3 cts
Accuracy Reference Conditions 23°C ±3K, 50% RH ±10%, battery at 8V ±0.2V, externa; magnetic field
Resistance Measurement Frequency 128Hz square wave
Interference Rejects high levels of interference voltage (DC, 50/60Hz, harmonics): DC voltage in series with X:20V AC voltage in series with Y: 13Vpeak 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 1000
Power Source Eight 1.5V "AA" batteries; Alkaline recommended;"LO BAT" indication on LCD
Battery Life 1800 15-second measurements
Fuse Protection High breaking capacity 0.1A, 250V, 0.25" x 1.25"
Mechanical Specifications
Display 7-segment LCD, .71" (18mm) high (3-1/2 digit); 2000 counts; 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 3 LEDs indicate high input noise, high auxiliary rod resistance, open leads, blown fuse
Operating Temperature 14° to 131°F (-10° to 55°C),0 to 90%RH
Storage Temperature -40° to 158° F (-40 to 70° C), 0 to 90% RH with batteries removed Dimensions 8.7 x 5.4 x 5.9" (220 x 136 x 150mm)
Weight 2.9 lbs (1.3kg)
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 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 IEC 1010-1 Cat III Pollution Degree 2, 24V
Agency Approvals Emission: EN 50081-1; Immunity: EN 50082-1

Ask a Question about the 3640

comments powered by Disqus

Current Promos

Get Free Shipping on any purchase over $299