Ground Resistance Tester Models 3711 and 3731
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Electrical Specifications
Ground Resistance
Measurement Range Range Resolution Accuracy*
0.1 to 1.00Ω 0.01Ω ± (2% R ± 0.02Ω)
1.0 to 50.0Ω 0.1Ω ± (1.5% R ± 0.1Ω)
50.0 to 100.0Ω 0.5Ω ± (2.0% R ± 0.5Ω)
100 to 200Ω 1Ω ± (3.0% R ± 1Ω)
200 to 400Ω 5Ω ± (6.0% R ± 5Ω)
400 to 600Ω 10Ω ± (10% R ± 10Ω)
Autoranging
0.01Ω to 1200Ω
600 to 1200Ω 50Ω Approx. 25% ± 50Ω
Ground or Leakage Current
Measurement Range Range Resolution Accuracy*
1 to 299mA 1mA ± (2.5% R + 2mA)
0.300A to 2.999A 0.001A ± (2.5% R + 2mA)
Autoranging
1mA to 30.00Arms
3.00A to 29.99A 0.01A ± (2.5% R + 20mA)
R = Reading
* Reference conditions: 23°C ± 3K, 50% RH ± 10%, battery at 8V ± 0.2V, external magnetic
field < 40A/m, external electrical field < 1V/m, conductor centered, loop resistance
noninductive. Accuracy % of Reading, Frequency: 50/60Hz.
Resistance Measurement Frequency: 2403Hz
Voltage Generated into the Loop: Approx. 60mVrms
Alarm Range (Model 3731 Only): 0 to 199Ω
Resistance Overload: OL displayed above 1200Ω
Current Measurement Frequency: 47 to 800Hz
Influence of Frequency: Add 7.5% to the reference specification
Current Overload: OL displayed above 29.99Arms
Mechanical Specifications
Dimensions: 9.25 x 3.94 x 2.17" (235 x 100 x 55mm)
Weight: 2.2lbs. (1kg)
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