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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 probes 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.
Specifications:
| 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 |
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