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AEMC 3731: Ground Resistance Tester


AEMC 3731 Key Features:

  • Simple and fast clamp-on operation – no leads, no auxiliary rods or spacing requirements. No need to disconnect neutral service
  • Direct reading of ground resistance from 0.01Ω to 1200Ω
  • Direct reading of continuity and ground loop resistance
  • Direct reading of ground leakage or phase current from 1mA to 30Arms
  • Jaw design with large 1.25″ (32mm) window – accommodates up to 1000MCM cables
  • Auto-off for power management
  • Alarm function with adjustable set point and buzzer for quick field checks
  • Memory function to store 99 field measurements for later retrieval
  • CE Mark and UL approved
  • Rugged Lexan head and body construction resists breakage
  • Alarm settings and stored memory information saved during shutdown
  • Patented design
SKU: aemc-3731 Categories: ,

More Information

The AEMC 3731 Portable Ground Resistance Clamp-on Tester measures electrical ground rod and grid resistance of installed multi-grounded systems around buildings, pads, cell towers, pools and spas, and most environments, with no leads, auxiliary rods, or spacing requirements

This Clamp-on Ground Resistance Tester is used on multi-grounded systems without disconnecting the ground under test. Simply clamps around the ground conductor or rod and measures the resistance to ground fast and accurately. By performing measurements on intact ground systems, the user also verifies the quality of the grounding connections and bonds. Resistance and continuity of grounding loops around pads and buildings may also be measured.

This AEMC 3731 Clamp-on Ground Resistance Tester includes a current measurement function. The probe’s high sensitivity enables measurement of leakage current flowing to ground or circulating in ground loops down to 1mA and neutral and phase currents to 30Arms. This feature provides additional information which is vital in distribution ground networks carrying higher levels of noise and harmonics that affect power quality.

Also the AEMC 3731 offers an alarm function and a memory (logging) function. In the alarm mode, the probe will audibly and visually indicate readings beyond set point. The user may also have the alarm initiated above or below the set point. This alarm feature permits quick field checks where only “pass” or “fail” readings will suffice.


Measurement Range:
Type Ground Resistance Ranges
Range Autoranging 0.01 to 1200Ω
Measurement Range 0.10 to 1.00Ω / 1.0 to 50.0Ω / 50.0 to 100.0Ω / 100 to 200Ω / 200 to 400Ω / 400 to 600Ω
Resolution 0.01Ω / 0.1Ω / 0.5Ω / 1Ω / 5Ω / 10Ω
Accuracy in % of Reading ± (2% Reading ± 0.02Ω ) / ± (1.5% Reading ± 0.1Ω ) / ± (2.0% Reading ± 0.5Ω ) / ± (3.0% Reading ± 1Ω ) / ± (6% Reading ± 5Ω ) / ± (10% Reading ± 10Ω )
Resistance Measurement Frequency 1.689kHz
Resistance Overload OL displayed above 1200Ω
Current Measurement Frequency 47 to 800Hz
Current Overload OL displayed above 30Arms
Power Source 9V Alkaline battery
Battery Life typical: 8 hours or approx. 1,000 measurements of 30 seconds
Mechanical Specifications:
Display 3-3/4 Digit, 1.73″ x 1.10″ (44 x 28mm)
Operating Temperature 14° to 131°F (-10° to 55°C)
Storage Temperature 40° to 158°F (-40°C to 70°C)
Relative Humidity 0 to 90% RH @ 14 to 104°F (-10°C to 40°C), 75% RH @ 131°F (55°C)
Dimensions 9.25 x 3.94 x 2.17″ (235 x 100 x 55mm)
Weight 2.2 lbs (1kg)
Jaw Window Diameter 1.25″ (32mm)
Jaw Opening 1.38″ (35m)
Case Lexan 920A (UL94V)
Colors Gray body, red jaws
Drop Test (1m); IEC 68-2-32
Dielectric Test 2500VAC
Environmental IP30, IEC 359 Group III
Working Voltage 150V Cat. III – Pollution Degree 2 300V, Cat. II – Pollution Degree 1
Max Overload (A or OHM Function) 100A continuous, 200A (<5s) 50/60Hz




Additional information


UOM - Unit of Measure


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